Journal articles: 'Kitchen exhaust fan system'

1

Jiang, Da Hua, An Gui Li, Fa En Shi, and Yu Jiao Zhao. "Test Analysis on Flow Field of Exhaust Hood in Commercial Kitchen." Advanced Materials Research 374-377 (October 2011): 560–63. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.560.

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Making exhaust hood model in laboratory according to exhaust hood in commercial kitchen, steam instead of fume, and characteristics of flow field are studied in kitchen exhaust hood. The distribution of velocity and temperature at typical planes was measured at valve opening of 45 degrees when water boiling. Results show that in a certain range, air velocity of exhaust hood decreases when air from the exhaust opening distance increases, velocity reduces with x and y increasing, steam velocity reaches maximum value close to exhaust outlet of fan.

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Dobbin, Nina A., Liu Sun, Lance Wallace, Ryan Kulka, Hongyu You, Tim Shin, Daniel Aubin, Melissa St-Jean, and Brett C. Singer. "The benefit of kitchen exhaust fan use after cooking - An experimental assessment." Building and Environment 135 (May 2018): 286–96. http://dx.doi.org/10.1016/j.buildenv.2018.02.039.

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Wang, Yue Ren, and Si Jia Luo. "Analysis on the Influence of Thermocompression on Exhaust Air Volume of Shared Residential Lampblack Exhaust System." Advanced Materials Research 374-377 (October 2011): 572–76. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.572.

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From the view of impedance, this article calculates the exhaust air volume of the smoke exhaust ventilator of the kitchen on each floor when opens individually comprehensively using CFD-FLUENT numerical simulation, origin data fitting and fluid mechanics theory calculation method, which chooses some 50-square meter rooms in a 20-floor building in Shenyang as the research object. This article then certifies the influence of thermocompression on the exhaust air volume of the kitchen on each floor of high-rise apartment building and summarizes the changing regularity of the exhaust air volume. Finally, the author draws a reasonable analysis method which could be used for calculating exhaust air volume of the kitchen on each floor under the condition of high operating rate.

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Wang, Gang, Mingsheng Liu, Yujie Cui, and David Yuill. "Retrofit Constant Speed Fan Laboratory Exhaust Systems Using Multi-Stack and Variable Frequency Drive Techniques." Journal of Solar Energy Engineering 126, no. 1 (February 1, 2004): 610–13. http://dx.doi.org/10.1115/1.1637641.

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Constant speed fan exhaust systems are the most popular exhaust system in laboratory buildings since they satisfy building architectural requirement, and have low initial costs with reliable performance. The constant speed fan exhaust system maintains constant stack exit velocity to prevent toxic exhaust air downwash back to occupied areas near the building or on the roof top. To achieve constant velocity when the exhaust airflow is less than the design value, makeup air is introduced to the system at the inlet of the exhaust fan. Since the laboratory exhaust airflow is often significantly less than the design airflow, exhaust fans consume significantly more energy than is necessary. Multi-stack and Variable frequency drive techniques can reduce both the make-up airflow rate and fan energy in the constant speed fan exhaust system retrofit. This paper introduces the application principles, describes the optimal methods of stack sizing, and presents an example. The application example showed that the average annual fan power is 50% of the design fan power for a two-stack system, and 47% for a three-stack system.

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Jiang, Da Hua, An Gui Li, Fa En Shi, and Zhi Hua Wang. "Numerical Simulation of IAQ under Up-Suction Exhaust Hood in Commercial Kitchen." Advanced Materials Research 250-253 (May 2011): 3228–31. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.3228.

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For particular commercial kitchen, using CFD software to build model according to the actual operation condition uttermost, adopting the exhaust system of up-suction hood, the effect of exhaust airflow rate on working temperature,velocity,CO2 concentration at main site in commercial kitchen is studied. According to the common four calculation methods of airflow rate of exhaust hood, the simulation results shows 4.81 m3/s of exhaust system can realize eliminating harmful gas quickly and effectively, IAQ is good relatively. Based on of it, additional airflow rate can not improve emissions effect and operating conditions obviously, whereas it can be detrimental to save energy. The simulation results help design exhaust system.

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Shang, Shao Wen, Xiao Yun Li, and Hai Feng Guo. "The Research on the Airflow Organization of Residential Kitchen and how to Introduce Make-Up Air." Advanced Materials Research 250-253 (May 2011): 1173–76. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.1173.

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This thesis analyzes the exhaust system of residential kitchen existing problems of indoor air quality. Discusses how to making up air to balance indoor air, eliminate the traditional system defects, through in the hearth additional secondary air tuyere through using the CFD----fluent6.2 simulation software simulates the airflow organization of the kitchen exhaust system if making up air . Analyze the kitchen indoor airflow velocity distribution, and the pressure distribution and velocity vector in the different condition. Under the action of differential pressure, outdoor air is sucked into the kitchen so as to achieve the reasonably airflow organization and get rid of foul gas effectively.

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Shang, Shao Wen, Lian Chi Pang, and Hai Feng Guo. "The Research on the Airflow Organization of Residential Kitchen and how to Introduce Make-up Air." Applied Mechanics and Materials 178-181 (May 2012): 707–10. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.707.

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Discusses how to making up air to balance indoor air, eliminate the traditional system defects, through in the hearth (under the smoke exhaust ventilator) additional secondary air tuyere. Using the CFD--fluent6.2 simulation software simulates the airflow organization of the kitchen exhaust system if making up air . Analyze the kitchen indoor airflow velocity distribution, and the pressure distribution in the different condition. Setting sizes for 0.06 ~ 0.10 m2 of secondary air tuyere, fill with air 0.162 ~ 0.184 kg/s ,it can avoid lampblack pollutants spilling effectively, reduce the operating energy consumption. After making-up air the kitchen remains negative state. Under the action of differential pressure, outdoor air is sucked into the kitchen so as to achieve the result, form reasonably airflow organization, meet exhaust requirements, get rid of foul gas effectively.

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Wang, Yue Ren, and Jiu Xu Zhao. "The Measured Analysis of Residential Kitchen Pressure Changed Exhaust Pipe System Characteristics." Advanced Materials Research 354-355 (October 2011): 711–16. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.711.

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in order to study and analysis on pressure distribution of pipeline system under the conditions of different power, to obtain the mutual influence degree between users. Through multi-storey residential pressure change exhaust system measured under the condition of three pressure changed board, the experimental results are compared and analyzed. The result of this paper obtains pressure of the mains and branch and branch speeds in different conditions. In six floors of 400 * 250 pressure changed type exhaust pipe system, no matter exhaust fan’s volume is high-end or low-end in any conditions can satisfy the exhaust requirements. Pipe internal pressure showed low - high – low.

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Sung, Sun-Kyung. "Exhaust Characteristics of Kitchen Hood System with Inclined Air Curtain." Korean Journal of Air-Conditioning and Refrigeration Engineering 26, no. 12 (December 10, 2014): 594–99. http://dx.doi.org/10.6110/kjacr.2014.26.12.594.

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Sung, Sun-Kyung. "Exhaust Performance of a Kitchen Hood System with a Supply Air Slot on a Kitchen Table." Korean Journal of Air-Conditioning and Refrigeration Engineering 28, no. 12 (December 10, 2016): 489–94. http://dx.doi.org/10.6110/kjacr.2016.28.12.489.

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Wang, Yue Ren, Nan Wu, and Wei Qi. "Analysis of Indoor Air Quality in Different Exhaust Conditions in Residential Buildings in Winter." Advanced Materials Research 610-613 (December 2012): 2823–26. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.2823.

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The research analyzes the residence buildings in winter in China which use toilet exhaust units and kitchen ventilator in various combinations as the existing exhaust system, meanwhile, set adjustable air intakes above bedroom and living room windows respectively. In order to provide certain security to solve the comfortable living environment, the indoor transient CO2 concentration distribution is simulated in different exhaust conditions by software Airpak.

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Perng, Jau-Woei, Yi-Chang Kuo, Yao-Tsung Chang, and Hsi-Hsiang Chang. "Power Substation Construction and Ventilation System Co-Designed Using Particle Swarm Optimization." Energies 13, no. 9 (May 6, 2020): 2314. http://dx.doi.org/10.3390/en13092314.

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This study discusses a numerical study that was developed to optimize the ventilation system in a power substation prior to its installation. We established a multiobjective particle swarm optimizer to identify the best approach for simultaneously improving, first, the ventilation performance considering the most appropriate inlet size and outlet openings and second, the reduction of the synthetic noise of the ventilation and power consumption from the exhaust fan equipment and its operation. The study used building information modeling to construct indoor and outdoor models of the substation building and verified the overall performance using ANSYS FLUENT 18.0 software to simulate the air velocity and air temperature distribution within the building. Results show that the exhaust fan of the B1F cable finishing room and the 23 kV gas insulated switchgear (GIS) room optimize the reduction of horsepower by approximately 1 Hp and 0.5 Hp. The combined noise is reduced by 4 dBA and 2 dBA; the exhaust fan runs for 30 min, and the two equipment rooms can cool down by 2.9 °C and 1.7 °C, respectively. Therefore, it is confirmed that the MOPSO algorithm provides a more energy-efficient and environmentally friendly building ventilation environment.

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Liu, Zhen Dong, Fang Wang, Yong Li Chen, Huo Wu, Chen Lu, and Ji Hua Zhang. "Energy-Saving Design for a Composite Heating Water System from Kitchen Waste Heat and Solar Energy." Applied Mechanics and Materials 446-447 (November 2013): 1498–501. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.1498.

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This paper proposed an energy-saving system which combination solar collectors for heating water system with heat pipe heat exchanger to recover kitchen waste heat. Its working principle is using heat pipe exchangers exhaust heat to warm the cold water from water storage tank, and during the day, take advantage of solar collectors to help heat pipe heat exchanger heating the water. In this design, the heat exchanger tank and the heat storage tank arranged independently, water tank associated control system was provided with automatic temperature regulator to control the opening and stopping of the pump. This system made full use of kitchen waste heat and solar to meet the kitchen cooking and cleaning process hot water supply needs.

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14

Wan, J. W., W. J. Zhang, and W. M. Zhang. "An energy-efficient air-conditioning system with an exhaust fan integrated with a supply fan." Energy and Buildings 41, no. 12 (December 2009): 1299–305. http://dx.doi.org/10.1016/j.enbuild.2009.07.032.

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15

Wang, Yue Ren, Bo Song, and Zhi Yang Su. "The Experimental Study of Residential Kitchen Gradually Expanding Oriented Structural Member Exhaust Pipe System Characteristics." Advanced Materials Research 610-613 (December 2012): 2827–31. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.2827.

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The purpose of this paper is to study the residential kitchen exhaust pipe system by introducing a gradually expanding oriented structural member called GEOSM for short and analyze the experimental effects of exhaust volume. With the change of the operating rate, we can obtain the best size of the GEOSM. In order to collate and analyze the experimental data, test the experimental effects of the g GEOSM of different sizes. Not only the pressure of main and branch but also the wind speed of the branch is recorded in this paper. In six floors of 400*250 gradually expanding oriented structural member exhaust pipe system, the fan’s volume can completely meet the basic requirements of everyday life whether its volume is high-end or low-end. The effect of exhaust is obviously better than the other size of the GEOSM when the cross section width of the GEOSM is 150mm and the cross section length of the GEOSM is 250mm, the height of the GEOSM is 350mm.There arises more smoke down when the cross section width of the GEOSM is 150mm and the cross section length of the GEOSM is 300mm, the height of the GEOSM is 350mm

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16

KONDO, Yasushi, Yukiko ABE, Shoko FUJINO, and Kyohei OHTA. "CFD SIMULATION ON KITCHEN LAYOUT, SHAPE OF EXHAUST HOOD AND HEATING SYSTEM." Journal of Environmental Engineering (Transactions of AIJ) 76, no. 669 (2011): 963–72. http://dx.doi.org/10.3130/aije.76.963.

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17

Becker, B. R., and L. F. Burdick. "Effect of Drift Eliminator Design on Cooling Tower Performance." Journal of Engineering for Gas Turbines and Power 114, no. 4 (October 1, 1992): 632–42. http://dx.doi.org/10.1115/1.2906636.

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In the use of wet cooling towers, drift refers to small droplets of circulating water that are carried out of the cooling tower by the saturated exhaust air. Inertial impaction separators, known as drift eliminators, are used to strip the water droplets from the exhaust air. To achieve peak cooling tower operating efficiency, it is desirable that losses in fan system performance due to the drift eliminators be minimized. Therefore, an experimental program was developed and executed to evaluate the effect of drift eliminator design on cooling tower fan system performance. Flow visualization studies were used to gain insight into the flow patterns within the cooling tower plenum as influenced by drift eliminator design. A fully instrumented fan test cell was used to investigate the effects upon fan system performance resulting from two different styles of drift eliminators. The effect of drift eliminator discharge angle upon fan system total efficiency was investigated and the optimal discharge angle determined.

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18

Kravchenko, Ilia, Risto Kosonen, and Simo Kilpeläinen. "Performance Analysis of the Demand-Based Ventilation in a Nordic Apartment Building." Applied Sciences 11, no. 1 (December 27, 2020): 176. http://dx.doi.org/10.3390/app11010176.

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In general, new Finnish apartment buildings are equipped with mechanical balanced demand-based ventilation. The airflow rate in the kitchen hood is boosted on demand to improve pollutant extraction during cooking. However, in practice, it has been found that the system does not work as desired. The focus of the paper was to present the simulation results from a case building equipped with a ventilation system that is commonly used in Finland. In the analysis, the airflow rates are calculated for the room, apartment, and air handling unit (AHU) levels for various ventilation mode scenarios. A significant imbalance of over 10% between the supply and exhaust airflows at the room and apartment levels was observed in the boosting mode. This imbalance creates a pressure difference over the building envelope, particularly in small studio apartments. The calculated pressure difference for future buildings with high airtightness were at the warning level of 40 Pa below atmospheric level. The kitchen hood exhaust system showed a 28% lower airflow rate in certain scenarios. A new solution to guarantee the designed airflow rates was proposed and assessed. The new solution consists of replacing the apartment level flow control damper and a new balancing method for the kitchen hood exhaust branch. The proposed design was able to stay within 10% of the designed airflow rates in all operation modes.

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Yi, Kun Woo, Young Il Kim, and Gwi-Nam Bae. "Effect of air flow rates on concurrent supply and exhaust kitchen ventilation system." Indoor and Built Environment 25, no. 1 (July 8, 2014): 180–90. http://dx.doi.org/10.1177/1420326x14541558.

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Kwon, Yong-Il. "A Study on the Ventilation Efficiency Improved by Airflow Characteristics of the Axial Fan Installed in Parallel at the Side Wall of the Narrow Exhaust Tower." International Journal of Air-Conditioning and Refrigeration 24, no. 04 (December 2016): 1650026. http://dx.doi.org/10.1142/s2010132516500267.

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A numerical study has been conducted to simulate airflow and ventilation characteristics in the exhaust tower installed to ventilation of the multi-story underground parking lot. It is the objective of the present study to identify ventilation problems and to suggest the flow direction modifications of the ventilation system with the axial fan to improve ventilation efficiency in the low-rise section of the exhaust tower. Numerical results on SVE4 (scale of ventilation efficiency NO.4) and local mean age of exhaust ports are presented along with the location of axial fan on the direction of swirl flow and the dimension of exhaust tower. Ventilation system modifications on the direction of swirl flow have been suggested from the numerical results in order to prevent the flow interference by airflow discharged from the adjacent stories. The overall ventilation efficiency according to the rotational condition of the axial fans are compared quantitatively using the concept of SVE4 calculated by means of tracer gas pulse method to investigate distribution characteristics of the air discharged from each story among the exhausted air to the two exhaust ports in the narrow exhaust tower.

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Kim, Hyeon-Tae, and Woong Kim. "Characteristics of Temperature Distribution of Pen for Exhaust Fan of Ventilation System." Journal of Animal Environmental Science 20, no. 4 (December 30, 2014): 155–60. http://dx.doi.org/10.11109/jaes.2014.20.4.155.

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Farmadi, Andi, Dwi Kartini Kartini, and Muliadi Muliadi. "SISTEM FUZZY INFERENSI UNTUK CUSTOMISE FAN PADA SISTEM RUMAH CERDAS." KLIK - KUMPULAN JURNAL ILMU KOMPUTER 7, no. 1 (March 2, 2020): 83. http://dx.doi.org/10.20527/klik.v7i1.306.

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AbstractSmart machine-based home development is becoming the current trend because the system can be controlled intelligently by machines. The air conditioning system without the use of air conditioning requires a type of fan to stabilize the temperature and humidity outside the house and inside the house using a blower fan or also called an exhaust fan, but this fan is only limited to circulating air circulation between the outside air and inside the house so that the tendency for the inside air adjust to the outside air, to control the air according to the user it will be manually customized by the user. And for fans in the home room a fan is used which blows air around the fan in circulation. The application of the fuzzy system can provide a fan rotation system that is done intelligently by the machine, which can adjust the balance between the outside air and indoor air to reach air confort or cool. Fuzzy system is applied using Sugeno fuzzy inference using 81 rules to customize the exhaust fan and fan in the room.Keywords: Fuzzy system, Smart home, Sugeno fuzzy.

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Moriyama, Shuji. "Smoke Control System for High-Rise Buildings in Japan." Journal of Disaster Research 6, no. 6 (December 1, 2011): 551–57. http://dx.doi.org/10.20965/jdr.2011.p0551.

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A smoke exhaust system must be installed basically in all high-rise buildings in Japan, in order to eliminate smoke and gas from combustible materials and ensure safe evacuation effectively. However, a new problem, i.e., the difficulty of opening and closing doors when a smoke exhaust fan is operating, has occurred since air-tightness has been improved in high-rise buildings. There are therefore many cases recently where a pressurized smoke control system is adopted. In this paper, the basic concept of this system is described and the pressurized smoke control system that is used in Harumi Triton Square, one of the largest high-rise buildings in Japan.

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Ifelola, E. O., and D. J. Afu. "Development of an Integrated Dust Collector and Local Exhaust Ventilation System for Controlling Industrial Mine Dust." Advanced Materials Research 824 (September 2013): 217–24. http://dx.doi.org/10.4028/www.scientific.net/amr.824.217.

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Dust control in an enclosed mine environment is a fundamental key to personnel safety for boosting personnel productivity and enhancing successful operation, hence the need to design a dust control equipment to meet this crucial requirement. A laboratory-scale local exhaust ventilating system for the control of airborne dust in an enclosed mine environment was designed and fabricated. The design was carried out by considering various design criteria required for a well-ventilated enclosed mine environment. Material selection of the components was done by taking into cognisance the physical characteristics of the targeted dust. The system designed was fabricated and then test-ran with dry dust laden air stream in order to determine its cleaning efficiency with respect to variation in fan speed and dust grain size. It was observed that the cleaning efficiency of the machine was high at a higher fan speed and low grain sizes. The cleaning efficiency ranged from (63.9-44.0)% for dust particle sizes ranging from (62.5-125) to (1000-2000) μm with a mean fan suction of 0.958Pa. Thus, with this system, improved cleaning of dry dust-laden enclosed mine workplace could be achieved with increased rate of suction of smaller particle-sized dust.

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Purnomo, Bagiyo Condro, Indra Chandra Setiawan, and Heru Adi Nugroho. "Study on Cooling System for Parked Cars using Mini Air Cooler and Exhaust Fan." Automotive Experiences 3, no. 2 (July 20, 2020): 81–88. http://dx.doi.org/10.31603/ae.v3i2.3801.

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Deaths among children and pets, as well as damage to car interior components, have been widely reported as a result of parking under direct sunlight for a long time. Rising car cabin temperatures in this condition trigger the formation of benzene gas, but it is not possible to turn on the AC due to security and energy consumption. Therefore, this article reports the experimental study on cabin cooling system for parked car under direct sunlight by applying a mini air cooler and exhaust fan powered by a solar cell on small car Bajaj Qute RE60. Two thermocouples were installed inside and outside the cabin to monitor the temperature for 7 hours, expressing daytime heat conditions. The results showed that this cooling system could reduce the temperature to 10 K by removing 8982 kJ (0.356 kW) of heat. In conclusion, this prototype is very promising to be developed and if implemented on a larger scale will reduce car interior damage while parking under direct sunlight.

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Lee, Gab-Taek, Chang-Seop Sim, and Kyung-Hee Lee. "A Study on the Performance Improvement of the Kitchen Common Exhaust System for Multi-family Houses." Journal of Power System Engineering 24, no. 4 (August 31, 2020): 89–96. http://dx.doi.org/10.9726/kspse.2020.24.4.089.

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Sojoudi, Atta, Farbod Vakilimoghaddam, and Reihaneh Neishapouri. "On the Optimization of Vent Arrangement in a Subway Station." Applied Mechanics and Materials 232 (November 2012): 620–24. http://dx.doi.org/10.4028/www.scientific.net/amm.232.620.

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Toxic gases resulted from fire events in subways stations are more dangerous than high temperature radiation from it. So, a well designed smoke exhaust system must be installed in subway station to control the smoke’s propagation and discharging. Smoke extraction in subway station depends on the duct laid above the ceiling, so vents are situated in the same level of platform layer’s ceiling. If subway station catches fire, smoke will cumulate in smoke reservoirs at the beginning and mechanical fan cannot exhaust any smoke in this process. In This paper, FDS 5.0 is used to simulate smoke’s movement in a side platform of an actual subway station in case of a fire. Simulations are carried out at the same volume flux of mechanical fan to investigate the effects of height of vents and depth of smoke reservoirs.

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Nguyen, Nhan Chi, Khang Phuoc Hoang Nguyen, Quan Hoang Nguyen, Hieu Van Nguyen, and Huy Thanh Ho. "Design of a monitoring and control system for Aquaponics based on Iot technology." Science and Technology Development Journal - Natural Sciences 4, no. 4 (November 1, 2020): First. http://dx.doi.org/10.32508/stdjns.v4i4.951.

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This paper presents the design of environmental monitoring and control system in aquaponics based on Internet of Things (IoT) technology. This system allows users to monitor and control the operation of devices through the application on smartphones, including: 3 water pumps, 3 air pumps, pH sensor, dissolved oxygen (DO) sensor, temperature sensor and humidity sensor, exhaust fan and misting. These devices are monitored and controlled in two modes: automatic and manual control. For 3 pumps and 3 air pumps, in automatic mode, allows the user to set the pump time between water pumps and between air pumps. In manual control mode, allows the user to control water pumps and air pumps by the push of a button on a smartphone application. Monitor pH, DO and allows the user to set the pH threshold and DO threshold to give an alert when the pH and DO exceed the threshold. Monitor the parameters of temperature, humidity in the membrane house and allow setting the temperature threshold and humidity threshold to control the exhaust fan and misting respectively when the temperature and humidity exceed the threshold. This system tested at aquaponics farm - Dong Thap Aqua. The results show that this system is working reliably and promising which brings significantly benefits to aquaponics. Besides, it also contributes to improve production efficiency and sustainable development of green agriculture.

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COLMAN LERNER, J. E., M. A. PELUSO, M. A. CAMPESI, H. J. THOMAS, A. A. PORTA, and J. E. SAMBETH. "INFLUENCE OF VOC EMISSIONS ON GLOBAL WARMING. MITIGATION OF THEIR IMPACT USING CERAMIC MONOLITHS SUPPORTED Pt, Mn AND Ce CATALYSTS AT PILOT SCALE." Latin American Applied Research - An international journal 47, no. 3 (July 31, 2017): 107–11. http://dx.doi.org/10.52292/j.laar.2017.309.

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The removal of a mixture of volatile organic compounds (CHCl3, methyl ethyl ketone, toluene and xylenes), was evaluated by adapting a commercial exhaust fan with a catalytic system applicable to small and medium enterprises. The catalysts used were Pt, Mn, Ce, Pt/Mn and Ce/Mn supported on ceramic monoliths. It was observed that all catalysts tested were able to reduce emissions of volatile organic compounds into the atmosphere. The CO2 equivalent emission of VOCs into the atmosphere (with and without treatment) was determined taking into account the power consumption of the exhaust system + catalyst, being observed for all catalysts tested a reduction in CO2 equivalent emissions. When a heat exchanger is attached to the exhaust system + catalyst to reduce power consumption, the emission of CO2 equivalent decreases appreciably in the order of 24.8%–45.3% compared to untreated emissions.

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Mui, KW, LT Wong, HC Yu, CT Cheung, and N. Li. "Exhaust ventilation performance in residential washrooms for bioaerosol particle removal after water closet flushing." Building Services Engineering Research and Technology 38, no. 1 (July 28, 2016): 32–46. http://dx.doi.org/10.1177/0143624416660597.

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Potential bioaerosol infection risk associated with toilet flushing has not been sufficiently addressed in the design of residential washroom exhaust system. This study evaluates the performance of exhaust ventilation for residential washrooms in terms of air change rate, washroom size, washroom geometry, and locations of door louver, exhaust and water closet. Three bioaerosol species namely Escherichia coli (ATCC 10536), Serratia marcescens (ATCC 6911), and Cladosporium cladosporioides (ATCC 16022) are included in the simulations. By shortening the distance between the locations of exhaust and emission source (i.e. water closet), the fractional counts of bioaerosol particles exhausted can be increased. An increased air change rate and a louvered door can also improve the exhaust ventilation performance, yet with a longer time to steady state. This study should provide a useful source of reference for washroom exhaust designers to minimize bioaerosol infection risk. Practical application: This paper shows for residential washroom with an exhaust fan installed, the ventilation performance can be improved by an increased air change rate, and by shortening the distance between the locations of exhaust and emission source.

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Коновалов, Дмитро Вікторович. "ЗАСТОСУВАННЯ ГАЗОДИНАМІЧНОГО ОХОЛОДЖЕННЯ В СИСТЕМАХ РЕЦИРКУЛЯЦІЇ ВІДХІДНИХ ГАЗІВ СУДНОВИХ ДИЗЕЛІВ." Aerospace technic and technology, no. 7 (August 31, 2019): 81–86. http://dx.doi.org/10.32620/aktt.2019.7.11.

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There are many ways and methods to reduce exhaust gases emissions on modern ships. One of the most effective ways to reduce NOx and SOx emissions is to use of exhaust gas recirculation (EGR technology). The EGR system disadvantage is an increase in back pressure through additional pressure losses in the scrubber and heat ex-changer, which entails an engine fuel efficiency deterioration. Creating a reliable and efficient heat exchanger for cooling recirculation gases is a complex task due to deposits and pollution emitted by these gases. In the pre-sent work, the jet apparatus effectiveness named aerothermopressor is analyzed in the scheme with exhaust gases recirculation of the ship low-speed two-stroke engine. Aerothermopressor is a two-phase jet for contact disperse cooling, in which by increasing the heat from the gas stream the gas pressure and cooling are increased. The calculation of the characteristics of the engine was carried out, both in nominal, and in operating modes and in all possible range of partial loads. The installation of the aerothermopressor before the scrubber is pro-posed, which allows reducing engine thermal load. Increasing the pressure in the aerothermopressor by 0.2-0.4 ∙ 105 Pa (6-12 %) allows reducing the back pressure in the gas exhaust system and thus reducing the load on the exhaust gas recirculation fan and when the engine load is higher than 75% in the cold zone, the fan is not need-ed, which additionally allows to reduce the specific fuel consumption. The parameters of the exhaust gases that are going to be recirculated and the processes of their gas-dynamic cooling in the aerothermopressor are based on the developed technique and program using the thermodynamic and gas dynamics equations. The proposed scheme-design solution allows at a high environmental friendliness of the existing exhaust gas recirculation sys-tem to provide a certain reduction in specific fuel consumption. It was determined that the engine specific fuel consumption has been decreasing when the aerothermopressor is used to Dge = 2.5-3.0 g/(kW·h) (1.5-1.7%).

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Balan, C. "Design Considerations of a Versatile Simulator for High-Bypass Turbofans." Journal of Engineering for Gas Turbines and Power 117, no. 1 (January 1, 1995): 31–37. http://dx.doi.org/10.1115/1.2812778.

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The continuing requirement for performance improvement of higher thrust turbofans is met by increased bypass ratios. The trend toward higher bypass ratios and relatively large-diameter low-pressure-ratio fans requires innovative design approaches, which include shorter inlets, slimmer nacelles, shorter fan ducts and exhaust systems, and possible elimination of thrust reverser. The success of this new generation of high-bypass ducted turbofans depends on understanding the acoustic impact from reduced treatment areas, inlet-fan coupling and operability, as well as overall system performance. To achieve these goals a versatile scale model propulsion simulator large enough to operate as a fan rig, yet small enough to be installed in a wind tunnel for evaluating overall acoustic, operability, and system performance, was developed. The criteria of designing such a simulator and its capabilities are discussed in this paper.

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Vorosne-Leitner, Anita, Laszlo Kajtar, and Jozsef Nyers. "Indoor environmental assessment method in residential kitchen." Thermal Science 24, no. 3 Part B (2020): 2055–65. http://dx.doi.org/10.2298/tsci180527318v.

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Nowadays, energy consumption, environmental protection and safety are fundamental issues in design process. In order to reduce energy consumption, buildings become increasingly insulated and air tight. It has controversial effect on indoor environment, therefore, it has become essential to apply an effective ventilation system. This requires detailed design, especially if there is a strong, local source in the space. In residential buildings, gas stoves are significant source of gaseous pollutants and heat load. Indoor environmental assessments have been carried out in order to evaluate the key parameters. The aim of this studies is to develop a new design and monitoring method of residential kitchens with gas stoves. Primary results of laboratory researches indicate that the largest stovetop burner with power of 2.8 kW, has the main role. Significant emissions of NOx have been measured, in an average size kitchen (Vroom = 36 m3) the Hungarian standard NOx concentration level (200 ?g/m3) can be ensured with an exhaust air-flow of 1102 m3/h. With respect of thermal environmental parameters, heat loads of residential gas stoves could be characterized with convective heat transfer coefficient of 4.5 W/m2K and radiant heat transfer coefficient of 5.9 W/m2K. As regards thermal comfort parameters, predicted mean rate index in proved to be applicable in residential kitchens from ?0.3 to +2.0. However draught rating cannot be applied, with respect to the temperature limitations.

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Kmecová, Miroslava, Michal Krajčík, and Zuzana Straková. "Designing Jet Fan Ventilation for an Underground Car Park by CFD Simulations." Periodica Polytechnica Mechanical Engineering 63, no. 1 (December 13, 2018): 39–43. http://dx.doi.org/10.3311/ppme.12529.

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The aim of this study was to design a fire ventilation system with impulse jet fans for an underground car park. With respect to the number of parameters affecting the spread of smoke that need to be considered, there is a good chance of miscalculations if only conventional plain calculations are used in the design process. To avoid mistakes, visualize the fluid flow, and to compare the design variants it is practical to use computational fluid dynamics (CFD). In this study, CFD simulations were used to compare alternative designs of a fire ventilation system. In one alternative the exhaust shafts were located in both parts of the car park and the jet fans were directed to the corresponding shafts. The air exchange rate was 10-times per hour. In another alternative both exhaust shafts were located on one side opposite to the main air supply, and the air exchange rate was 15-times per hour. The results showed preference of the second alternative, when the smoke was completely exhausted and the visibility improved substantially, whereas in the first alternative the car park was not sufficiently ventilated even 600 seconds after the fire had been put out. The results emphasize that proper location of elements of the ventilation system is crucial to attain high efficiency of fire ventilation.

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Santoso, Budi, Dominicus Danardono Dwi Prija Tjahjana, and Purwadi Joko Widodo. "Performance Evaluation of Axial Flow Wind Turbine Integrated with The Condenser." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 76, no. 3 (October 29, 2020): 85–91. http://dx.doi.org/10.37934/arfmts.76.3.8591.

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This study investigated the application of an axial flow wind turbine integrated with a condenser. The exhaust air from condenser was used to drive the wind turbine by a ducted turbine system. There were two parameters varied in this work: the blade number and the blade pitch angle. The blade number used was two blades, five blades, and ten blades, while the blade pitch angles were 5°, 10°, 15°, 20°, 30°, and 45°. The diameter of the wind turbine was 495 mm. The model of the condenser had a fan diameter of 600 mm and the range of the average air velocity of 2.01 m/s - 7.86 m/s. The maximum mechanical power was 10.72 W for air velocity of 7.86 m/s. The maximum power coefficient recorded was 0.38 for the tip speed ratio of 1.3 on the blade number of five blades and a pitch angle of 10°. The maximum exhaust air energy recovery was 13.64% of the power consumption of the condenser fan.

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Zeng, Yun Fan, and Min Hui Zhang. "A Central Air Conditioning System Design for Guesthouse in Changsha City." Applied Mechanics and Materials 170-173 (May 2012): 2431–36. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2431.

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This article presents the design of the air conditioning system in the building. In the project, ice storage for cold source and electric boiler thermal storage for heat source are taken while variable primary flow is used for water system. Taking into account the functions of each part, all air and fan coil unit with fresh air system are applied in ventilation system. The design of air exhaust system is introduced. A detail scheme about the annual operational regulation for energy saving is proposed. During the designing process, energy conservation is given enough attention, and the reliability of operation is also ensured.

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Du, Qing, Yanhua Miao, and Yunhui Zhang. "Design of Intelligent Monitoring System of Chicken House Environment Based on Single-chip Microcomputer." MATEC Web of Conferences 227 (2018): 02008. http://dx.doi.org/10.1051/matecconf/201822702008.

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In view of the problem that some chicken farms are susceptible to various bacteria and viruses due to poor breeding environment, this paper designs a chicken house environmental intelligent monitoring system based on single-chip microcomputer application to improve the chicken house environment. The system adopts STC89C52 single-chip microcomputer as the main control chip. The sensor collects information on the light intensity, temperature and humidity, and carbon dioxide concentration, and controls the exhaust fan and the illumination lamp, and the environmental parameters can be displayed on the display in real time.

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Kwon, Yong-Il, Yeol-Wha Jeong, and Jung-Hun Ahn. "Study on the Performance Improvement of Roof Fan Used for Local Exhaust System Installed in Apartment." Korean Journal of Air-Conditioning and Refrigeration Engineering 24, no. 2 (February 10, 2012): 136–41. http://dx.doi.org/10.6110/kjacr.2012.24.2.136.

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Lee, Suin, Gyeong-Seok Choi, Yong Jun Lee, and Hyun-Hwa Lee. "An Analysis of the Humidity Reduction of Ventilation System Using Centralized Exhaust Fan in Condensation Prevention." Korean Journal of Air-Conditioning and Refrigeration Engineering 33, no. 2 (February 28, 2021): 55–63. http://dx.doi.org/10.6110/kjacr.2021.33.2.055.

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Lee, Hyun-Sang, Myung-Oh Yoon, Young-Ju Lee, and Jeong-Joon Kim. "Application Plan of Exhaust Systems in Strengthening Evacuation Safety in Apartment Houses." Fire Science and Engineering 34, no. 3 (June 30, 2020): 49–57. http://dx.doi.org/10.7731/kifse.7a469730.

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Apartment buildings are becoming taller and more densely populated with the advancements in science and the development of cities, Consequently, various amenities and safety facilities are being developed to improve the quality of life for residents. However, according to statistics, the number of casualties in apartments accounts for a high proportion of accidents, and the leading cause of the casualties is smoke emitted from fires while sleeping at night. Although it is best to install separate indoor facilities in apartments to minimize smoke damages to occupants, it is useful to minimize the smoke damages by utilizing the installed facilities while reducing the financial burden of occupants. Based on the review, the heat exchanger ventilation system and the kitchen collective exhaust system were selected, and the feasibility of these systems was verified through fire simulation . From the verification results, the available safe egress time improved by 27, 30, and 35 s on the 25th, 35th, 50th floors, respectively.

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Абдразаков, Ф., Fyarid Abdrazakov, А. Поваров, and Andrey Povarov. "RESEARCH EFFICIENCY OF NATURAL VENTILATION SYSTEM OF APARTMENT BUILDING." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 4, no. 7 (July 21, 2019): 49–56. http://dx.doi.org/10.34031/article_5d35d0b78284d1.97759530.

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The analysis of existing research in the field of ventilation systems is performed and the current shortcomings of the ventilation systems of secondary apartment houses of series 114–85 are identified. The instability of the natural ventilation system of an apartment building characterized by variable air exchange and overturning ventilation in the ventilation ducts is demonstrated. Field studies of the natural ventilation system efficiency of an apartment house series 114–85 located in Saratov are carried out. According to the research results, the absence of traction and the presence of reverse traction in the exhaust ducts of the ventilation system are revealed. The initial reason for the lack of normal traction in the ventilation system associated with its calculation in the project of building a house series 114-85 for open mode operation is stablished. The increased tightness of windows and doors of apartments is determined, resulting in a reversed traction and the impossibility of uniform distribution of air vertically of the house, therefore installing only the exhaust system of the natural ventilation of an apartment building is inefficient. It is established that the ventilation channel in the kitchen is constantly working to extract air from the premises of the apartments, since the bathroom door is tightly closed that does not correspond to the normative indicators. The analysis of ventilation system on the example of three-bedroom apartments shows the need for additional supply devices for controlled flow of outside air into the premises of apartments. The use of supply wall valves of KIV-125 brand and window ventilation valves of Air Box Comfort brand is provided. A methodology of selection the modern, highly efficient energy saving models of turbo ventilators is presented, increasing traction in exhaust ventilation ducts at 40 % and independent of direction and wind gusts.

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YAMANAKA, Toshio, Hisashi KOTANI, Toshinari MOMOSE, and Akihiro YAMAMOTO. "CFD Simulation in Commercial Kitchen with Ceiling Exhaust System Modeling of Plume above Cooking Stove for CFD Simulation." Proceedings of the Symposium on Environmental Engineering 2002.12 (2002): 481–84. http://dx.doi.org/10.1299/jsmeenv.2002.12.481.

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Keever, D. W., and L. A. Hamm. "Descriptive Model of Phosphine Concentrations and Emission Rates During Controlled Aeration of Fumigated Tobacco Warehouses." Journal of Entomological Science 31, no. 2 (April 1, 1996): 218–26. http://dx.doi.org/10.18474/0749-8004-31.2.218.

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A model was developed to describe the emission of phosphine gas from the interior of a tobacco warehouse to the outside during controlled aeration after fumigation of the warehouse. We used a fan/stack exhaust system to control the aeration, but other systems can be used. Model inputs include phosphine concentrations in the warehouse just prior to aeration, warehouse characteristics, and characteristics of the system used to release phosphine. Model outputs for any time during aeration include the emission rate of phosphine from the warehouse, the phosphine concentration remaining in the warehouse, and suggested exhaust rates that help fumigators comply with regulatory standards on phosphine emission rates. (Exhaust rate refers to release of air/phosphine mixture from the warehouse [=volume/time], but phosphine emission rate refers to the amount of phosphine [=mass/time]). The model also calculates how much exhaust rates can be increased at regular time intervals to hasten aeration without exceeding the initial phosphine emission rate. The model can be used by fumigators to comply with regulatory standards on phosphine emissions, and by regulators to assess that compliance. Diffusion of phosphine from the packaged tobacco (cases) into the freespace of the warehouse and its impact on the model are discussed.

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Bonnett, Jonathan, Carmel Cuschieri, and Joseph M. Cuschieri. "Noise Control design for a Ventilation Fan - Case Study." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (August 1, 2021): 5731–39. http://dx.doi.org/10.3397/in-2021-3238.

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A ventilation system was design and installed for a multi story garage. The ventilation system system had a vertical concrete shaft with the ventilation fan located on the top floor at street level. The ventilation fan is separated from the outside by a set of metal louvers. Adjacent to the louvers is an open pedestrian area. The exhaust fan as installed had an inline duct silencer but this was insufficient in terms of providing the desired noise mitigation. The project desire was not to make changes to the fan or its inline silencer or the external louvers so an alternative noise mitigation option had to be explored. Based on the provided sound power characteristics of the fan, the exterior noise levels as calculated matched the expected levels coming out of the metal louvers. The interior of the ventilation shaft is bare concrete with the fan installed though a hole in the concrete top floor. The predominate noise was the very high reverberation inside the ventilation shaft. The owner of the property made an attempt at installing noise absorption but this was not sufficient. Based on the field data the sound levels with the preliminary absorption solution matched expectation, but further noise reduction was required. A complete sound absorption on the walls of the concrete ventilation shaft noise mitigation solution was design, and the expected levels predicted to show that significant noise reductions can be obtained by a comprehensive noise absorption solution. The noise mitigation solution was implemented and exterior sound level measurements performed at the completion of the project. The measured sound levels outside of the metal louvers were in very good agreement with the predicted levels. Based on the success of this first noise mitigation solution, noise mitigation for a second ventilation system is not being considered.

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Hasan, Nor Halim, Md Radzai bin Said, Abdul Mutalib Leman, and Norzelawati Binti Asmuin. "Validate of Local Exhaust Ventilation (LEV) Performance through Analytical, Experimental and Computational Fluid Dynamic (CFD): A Case Study Model." Applied Mechanics and Materials 554 (June 2014): 670–74. http://dx.doi.org/10.4028/www.scientific.net/amm.554.670.

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Local Exhaust Ventilation (LEV) system are a tools in engineering control stated in Occupational safety and health management system where to protect a workers from inhale the contaminant that will effected to their breathing system. To design, construct and applications of LEV are followed an international guidance such as American Conference of Governmental Industrial Hygienist (ACGIH).A sample two inlet and outlet of LEV system are design based on ACGIH including hood, ducting branch, main ducting, elbow, y-tee, fan and stack. The design is based on ACGIH standard with assuming the contaminant are fumes with 2 inlet of 6 inches round duct and outlet is 8 inches round type. The result from calculation according to the size of branch duct size, main duct size, fan capacity and stack size. Other data contribute are velocity and pressure drop along the duct.LEV system are design by using Solid Work Software and export file to Ansys 14.0, where the simulation are used to compare the result of velocity and differentials of pressure before proceeds to construct the system as additional in design process as follow in ACGIH Standard. Finally result of this study indicated that no significant different of the result of velocity along the ducting between design, experimental and compare with the simulation results.Where the analysis shows different compare with analytical almost below 30% and further study on comparative different of static pressure should carry out.

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Hakim, Ahmad Luqmanul, and Lilis Sulistyorini. "RELATIONSHIP OF ENVIRONMENTAL PHYSICAL FACTORS AND LIQUID INTAKE WITH HYDRATION STATUS OF LONTONG HOME INDUSTRY SURABAYA." Indonesian Journal of Public Health 16, no. 1 (April 12, 2021): 79. http://dx.doi.org/10.20473/ijph.v16i1.2021.79-88.

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A hot working environment can cause health problems for workers, one of them being dehydration. The hydration status of a worker can be influenced by the characteristic of the worker, physical environmental factors, and fluid intake. The objective of this study is to determine the relationship between workers’ characteristics, physical environmental factors, and fluid intake with the hydration status of workers. This study was conducted using the cross-sectional design method and used a simple random sampling technique to select 17 respondents and 17 home industries originally derived from 20 respondents and 20 home industries. The research location was on Jalan Banyu Urip Lor X Surabaya. Data were analyzed using cross-tabulation and fisher’s exact test with a confidence level of 95%. The data were collected through interviews, measurements, questionnaires, and verification. The results showed that there was a significant relationship between physical environmental factors, which included temperature (p = 0.002), humidity (p = 0.029), and fluid intake (p = 0.029), with the hydration status of workers. In general, it can be concluded that physical environmental factors and fluid intake are relevant towards the hydration status of workers. Therefore, it is recommended that the workers improve air circulation in the room by adding natural ventilation, an exhaust fan in the kitchen, and are advised to consume enough mineral water while working.Keywords: temperature, humidity, fluid intake, hydration status

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Jian, Chen, Xu Yan Ying, and Wang Yan Sheng. "Experimental and Numerical Study on the Suppression of Pool Fire with Water Mist." Advanced Materials Research 790 (September 2013): 686–89. http://dx.doi.org/10.4028/www.scientific.net/amr.790.686.

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The objective of this work is to investigate the diesel analog pool fire with water mist .For this purpose, a series of water mist fire suppression experiment are carried out by changing the nozzle operating pressure, the source of fire power, opening and closing the exhaust fan to analyze the inhibitory effect of water mist to oil pool fire in the enclosed compartment of 5.0m × 5.0m × 3.0m. The results shows that extinguishing efficiency first increases and then decreases when the nozzle operating pressure increases from 8MPa to 12MPa, reaching the highest efficiency at 10MPa; increasing the power of the source of fire, the burning speed increases and the water mist fire extinguishing efficiency decreases; fresh oxygen coming in when smoke exhaust fan is turned on and water mist fire suppression efficiency decreases. Using FDS to simulate the water mist extinguishing oil pool fire, the predict temperature field and extinguishing time are basically consistent with the experimental results. In the actual applications of water mist fire suppression systems engineering, we can use the FDS field simulation methods to predict the characteristic parameters variation of the fire fighting fire temperature and component concentration, which is significant to the fire extinguishing system optimized design.

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Dahlan, NY, S. Z. Sakimin, M. Faizwan, N. Ajmain, and A. A. Aris. "Automated Calibration Of Greenhouse Energy Model Using Hybrid Evolutionary Programming (EP)-Energy Plus." Indonesian Journal of Electrical Engineering and Computer Science 12, no. 2 (November 1, 2018): 648. http://dx.doi.org/10.11591/ijeecs.v12.i2.pp648-654.

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This paper presents an optimization approach of calibrating a tomato greenhouse energy model using hybrid Evolutionary Programming (EP)-EnergyPlus. The proposed methodology applies automated simulation-based approach by coupling Matlab and EnergyPlus to perform building energy simulation and obtain the best variables configuration with minimal error between the simulated and measured energy of the greenhouse. The proposed method is tested using a tomato greenhouse system located in Universiti Putra Malaysia (UPM). The greenhouse envelope is built using 0.15mm thick Transparency Plastic Film. Meanwhile, the electrical loads in the greenhouse consists of 6 exhaust fans, 2 axial fans, 5 fluorescent lamps and 1 irrigation pump. An Evolutionary Programming (EP) algorithm is chosen and programmed in Matlab to find the best configurations for optimum calibration of the greenhouse energy model. Three variables were chosen to find the best configuration which are the operating hours of Exhaust Fan, Axial Fan and Water Pump. The EP optimization algorithm in Matlab is coupled with building energy simulator, EnergyPlus using BCVTB as the coupling tool. Result shows that the EnergyPlus-EP model can provide NMBE and CV(RMSE) within the range recommended by the IPMVP protocol. The proposed method is not only requiring less computation time but also effective in searching for the best variables configuration with minimal error.

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Kodryk, A., O. Titenko, V. Prysiazhniuk, and S. Semychaievskyi. "DETERMINATION OF CHARACTERISTICS AND SMOKE EXHAUSTERS PARAMETERS IN CONDITIONS OF INDEPENDED AND JOINT WORK WITH OTHER DEVICES BASED ON MATHEMATICAL MODEL." Науковий вісник: Цивільний захист та пожежна безпека 1, no. 2 (December 30, 2018): 10–17. http://dx.doi.org/10.33269/nvcz.2018.2.10-17.

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The principle of construction and examples of implementation of the developed mathematical model of the smoke exhaust system designed for operational use in case of fire for the elimination of gas pollution and lowering the temperature in the premises. Estimated target features of the installation are based on existing experience, namely: expected aerodynamic airway resistance: 80 Pa and volumetric air mixture flow rate of 3.3 m3/s. The specified characteristics and parameters necessary for the design, or modernization of existing axial fans, and their choice for three operating modes: independent work, joint work with the supply of finely divided water, joint work with the foam generating plant. Simplifications were used in the development of a mathematical model: scheme of the design of the axial fan, which does not involve the presence of a guiding apparatus; it is assumed that the flow in the operating cavity of the pump is axially symmetric; it is assumed that the thermodynamic process taking place in the pump cavity is isothermal; simplified formula of the lifting factor and drag coefficient of the grid is used on the basis of known table data. The mathematical model takes into account: the dimensions of the smoke exhaust system, the number and size of the blades, the angle of attack of the blade, the frequency of rotation, the amount of aerodynamic resistance of the airway, the density and the amount of supply of finely divided water or foam. The examples of the implementation of the developed mathematical model of the smoke exhaust system are illustrated in the form of diagrams of the location of the working points (volume flow of air mixture, m3/s, pressure, Pa; power of the engine of the smoke exhaust system, W) at operation of a smoke exhaust system in the conditions of the average airway for the three above-mentioned operating modes.

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Chen, Li Hai, Qing Zhen Yang, and Jin Hui Cui. "Numerical Simulation on the Infrared Radiation Characteristics of Ejector Nozzle Based on RMCM." Applied Mechanics and Materials 138-139 (November 2011): 879–85. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.879.

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Based on the numerical calculation of three-dimension flow field of the exhaust system, a code is developed by the reverse Monte-Carlo method (RMCM) to simulate the infrared radiation characteristics of the aeroengine exhaust system and the plume. A ray-tracing method (RTM) is introduced to seek the meshes of the flow field which the ray travels through to avoid the trouble of interpolation. The infrared radiation characteristics of a certain turbo-fan engine’s ejector nozzle in the waveband of 3-5μm is simulated at non-afterburning condition. The results of the simulation show that : (1)Because of the introduction of the secondary flow, the average temperature of the ejector nozzle’s core plume is 20K lower than the baseline one’s.(2) The infrared intensity for the ejector nozzle is most reduced relatively by 44.5% in comparison with the baseline nozzle along lateral direction.(3) The ejector nozzle has a better performance of infrared stealth.

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Journal articles on the topic 'Kitchen exhaust fan system'

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