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Journal articles on the topic 'Air conditioning chamber'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Md., Fazle Rabbi. "Development of Industrial Air Dust Removing and Air Cooling Machine for Heavily Polluted Areas of the Industry." European Journal of Advances in Engineering and Technology 5, no. 8 (2018): 517–20. https://doi.org/10.5281/zenodo.10715909.

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<strong>ABSTRACT</strong> Industrial air dust removing and air cooling machine is constructed based on the fluid mechanics principles and application of applied chemistry. One air pump absorbed dusty air from the polluted industrial area and flows it into the main chamber. The main chamber purifies the dusty air by passing it through the water, plastic net and transparent cloth. Another air pump absorbs the pure air from the chamber and flows the pure air into in the industry again. As water temperature remains less than air temperature the air will be cooled and pure air will help the air con

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2

Arao, Yuki, and Ryoichi Kuwahara. "A study on the influence of different blowing systems on indoor thermal environment and air quality in underfloor air conditioning system." E3S Web of Conferences 356 (2022): 01009. http://dx.doi.org/10.1051/e3sconf/202235601009.

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The purpose of this study is to investigate the most effective blowing method of underfloor air conditioning system from the viewpoint of comfort and ventilation performance using CFD simulation. In this study, we simulated three types of air blowing systems: floor radiation, floor-supply displacement air-conditioning, and floor chamber. Then, comfort was evaluated from thermal environment and PMV, and ventilation performance was evaluated from air age. As a result, the floor radiation system was able to maintain comfort. However, it was found that the floor-supply displacement air-conditionin

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Jian, Yiwen, Shuwei Liu, Mengmeng Bian, Zijia Liu, and Shengjie Liu. "Climate Chamber Experiment Study on the Association of Turning off Air Conditioning with Human Thermal Sensation and Skin Temperature." Buildings 12, no. 4 (2022): 472. http://dx.doi.org/10.3390/buildings12040472.

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To date, few attempts have been made to associate air conditioning behavior with environmental conditions and the occupants’ thermal sensations and physiological states simultaneously. In this study, a series of experiments were conducted in a climate chamber environment, representative of a typical intermittent air conditioning process in residences. For 29 participants, local skin temperatures, thermal sensation and the participants’ intention of turning off air conditioning were recorded continually. Skin temperature and thermal sensation were found to keep decreasing over time, which in tu

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Elang Pramudya Wijaya and Ardiyansyah Saad Yatim. "Numerical Investigation of Air Movement on Laboratory Scale Psychrometric Chamber." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 84, no. 2 (2021): 82–91. http://dx.doi.org/10.37934/arfmts.84.2.8291.

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Higher energy demands in favorable energy prices increasing people's affordability of the cooling devices, causing most building and residential areas to wear air conditioning systems. Higher energy saving, efficiency, and eco-friendly equipment have become a challenge for manufacturers and researchers. Also, Indonesia's government rules the energy efficiency by SKEM (Minimum Standard of Energy Performance) by air conditioning equipment's labeling. In this study, the use of perforated ceiling was selected due to the excellent air distribution performance of the panels. This study analyzes the

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Zhang, Yu Fan, Zhi Hao Ji, Jin Yan Liu, et al. "Study on Mathematical Model in Working Process of Automotive Air Conditioning Scroll Compressor." Applied Mechanics and Materials 741 (March 2015): 572–76. http://dx.doi.org/10.4028/www.scientific.net/amm.741.572.

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In order to study the working features of automotive air conditioning scroll compressor, this paper uses mathematical model of working process to analyze it. After studying working process, a equation of suction volume is given. The thermodynamic model of compression chamber and back pressure chamber includes mass conservation and energy conservation. Based on Hydromechanics, leakage models of radial leakage and tangential leakage are discussed. The model lays a foundation of automotive air conditioning scroll compressor performance simulation.

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Yatim, Ardiyansyah, Ridho Irwansyah, Aldi Pradana, Jassim Addi, and Aurelie Adam. "Design of Humidifier Control System for Psychrometric Chamber in the University of Indonesia." Journal of Physics: Conference Series 2972, no. 1 (2025): 012017. https://doi.org/10.1088/1742-6596/2972/1/012017.

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Abstract Currently, the Air Conditioner is one of the tools that has become a necessity for people all over the world. Most homes, office buildings to shopping centers use Air Conditioners to increase comfort. Therefore, the use of electricity due to air conditioning is quite large and always increases with the increase in population. This is the government’s concern because the increase in energy required is increasing. The government wants to try to reduce the consumption of electrical energy due to the use of air conditioning without reducing the need for air conditioning for the community.

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Isakhodjayev, Kh, F. Mukhtarov, D. Kodirov, and I. Toshpulatov. "Development of a laboratory nozzle chamber installation for the humidification of buildings." IOP Conference Series: Earth and Environmental Science 939, no. 1 (2021): 012025. http://dx.doi.org/10.1088/1755-1315/939/1/012025.

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Abstract The nozzle chamber, in which water is sprayed into the air stream using mechanical nozzles, is the main unit for these processes in central air conditioning systems (AHUs). The types of nozzles used do not have a sufficiently high effect of interfacial surface forming due to increased metal usage and the broad total dimensions of certain chambers, i.e., they do not have intensive heat and mass transfer. The authors performed testing of the apparatus in the direct iso-enthalpic air cooling mode to improve the performance of the nozzle chamber. Thus, the experiments conducted confirm th

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Egnatosyan, Siranush, and Naira Egnatosyan. "Developing a new method of calculating heat and humidity air treatment by water in irrigation chamber." E3S Web of Conferences 281 (2021): 06003. http://dx.doi.org/10.1051/e3sconf/202128106003.

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The air treatment processes in the air conditioning systems are the main part of air conditioning. This paper presents the new corrected method of heat and humidity treatment calculation of air by water, where not only the heat transfer process between water and air is taking into account but also the mass transfer process. The accuracy of the suggested method verified using the calculations to determine the parameters of air and water in various real processes of heat and humidity air treatment, shown in the psychometrics chart of various scales. Application of the suggested method gives an o

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Li, Lu, Wenhua Chen, Hui Zhang, et al. "Ceiling-Fan-Integrated Air Conditioning (CFIAC): Age-of-air, Air Pollution, and Airflow Distribution." E3S Web of Conferences 396 (2023): 02039. http://dx.doi.org/10.1051/e3sconf/202339602039.

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Ceiling-Fan-Integrated-Air Conditioning (CFIAC) is a heating ventilation and air conditioning (HVAC) design approach that jets supply air into the vicinity of ceiling fans to be mixed and distributed within the room. This eliminates terminal ductwork and diffusers and provides very efficient cooling for the occupants. Two previously published papers have described the air velocity, temperature, and thermal comfort fields in a space conditioned by CFIAC. This paper is the third in this series, to evaluate CFIAC ventilation effectiveness and its effect on air pollution. In a test chamber, HVAC s

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Kuncoro, C. Bambang Dwi, Tandi Sutandi, Cornelia Adristi, and Yean-Der Kuan. "Aeroponics Root Chamber Temperature Conditioning Design for Smart Mini-Tuber Potato Seed Cultivation." Sustainability 13, no. 9 (2021): 5140. http://dx.doi.org/10.3390/su13095140.

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The aeroponic plant root environment has a significant role in producing high-quality seed tuber potatoes. However, in lowland and tropical regions, the aeroponic system cannot yield high-quality potato seed because the average environment temperature year-round is high. In a high-temperature environment, the potato plant roots cannot optimally absorb the nutrient solution for healthy plant growth. This paper presents the method used to maintain the aeroponics root chamber temperature conditions. An air conditioning system was adopted to supply air with the optimal temperature range for mini-t

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Corelli-Grappadelli, Luca, and E. Magnanini. "A Whole-tree System for Gas-exchange Studies." HortScience 28, no. 1 (1993): 41–45. http://dx.doi.org/10.21273/hortsci.28.1.41.

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Based on a commercially available net photosynthesis (Pn) unit coupled to a custom-built chamber that does not require air conditioning, a low-cost system to measure whole-tree gas exchange in the field is described. The temperature in the chamber is influenced by air flow in relation to tree size. A flow of 20 liters·s-1 (equal to ≈1.5 chamber volume changes/min) was sufficient to maintain the leaves of an 11-year-old `Golden Delicious'/M.27 tree at a temperature similar to that of the ambient air and control CO2 gradients in the chamber. The system has been in operation on apple (Malus domes

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Joyeshree, Biswas, Das Suman, Md Siddique Iqtiar, and Minhajul Abedin Md. "Sustainable Industrial Practices: Creating an Air Dust Removal and Cooling System for Highly Polluted Areas." European Journal of Advances in Engineering and Technology 11, no. 3 (2024): 1–11. https://doi.org/10.5281/zenodo.10776875.

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<strong>ABSTRACT</strong> The conceptualization of the industrial air dust removal and air-cooling machine is rooted in the principles of fluid mechanics and the practical application of applied chemistry. Dust contamination in industry has a significant impact on both production safety and worker health. In recent years, wet-type and bag-type dust collectors with high efficiency have been widely utilized for dust removal. However, several issues exist, including high resistance and energy consumption. An air pump is utilized to draw in contaminated air from the severely polluted industrial ar

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Reddy, S. Deepak. "CFD Analysis on Air Conditioning Effect Using K-Omega Model." International Journal for Research in Applied Science and Engineering Technology 13, no. 2 (2025): 366–78. https://doi.org/10.22214/ijraset.2025.66806.

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In this paper CFD analysis reveals the significance of cooling coil temperature, Reynolds Number, and Number of Occupants in the Chamber in the domain of maintaining ambient temperature. CFD Analysis used the regulation of any arbitrary office chamber using the Air conditioning effect. Governing equations consist of the Continuity equation, Energy Equation, and Naiver-Stokes Equation to understand the heating and cooling effect using Ansys. Unsteady Analysis is performed by varying several parameters like Reynolds Number, Number and Orientation of Cooling Coils. The strength of the Reynolds Nu

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Zhang, Wanqing, Xin Gao, and Angui Li. "Effects of multi-orifice plate with different geometric parameters on flow distribution of plenum chamber for ventilation duct systems." E3S Web of Conferences 356 (2022): 02044. http://dx.doi.org/10.1051/e3sconf/202235602044.

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Plenum chambers are common devices used for flow and pressure equalization in ventilation and air conditioning systems. Aiming for reducing energy consumption and improving ventilation performance, the optimal cross-sectional aspect ratio (W/H) and length (L) of the single-path unlined rectangular plenum chamber is obtained through the authors’ preliminary research. In this study, based on the analysis of interior flow characteristics of single-path plenum chamber, it is shown that the traditional chamber configuration commonly used in engineering is not an ideal structure that can achieve uni

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15

Nadeev, Aleksandr A., Aleksandr V. Barakov, and Dmitry A. Prutskikh. "To the calculation of the apparatus of water-evaporative air cooling." Urban construction and architecture 11, no. 4 (2021): 164–68. http://dx.doi.org/10.17673/vestnik.2021.04.20.

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The use of evaporative cooling in ventilation and air conditioning systems can significantly reduce energy consumption during their operation. The paper describes the design and principle of operation of water-evaporative air cooling apparatus, in which a fluidized bed of dispersed material is used as a packing, which is continuously circulating in the working chamber. A test sample of an air cooler is described, the parameters of its packing are given. The technique of its experimental research and the used measuring instruments are presented. The criterion ratios for the efficiency factor of

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Huang, Yuan Yuan, Fang Wang, Yi Wei Xiong, Tian Wu Li, and Yong Li Chen. "Design on High-Precision Condensation Water Measurement in Air Conditioner Performance Testing Chamber." Applied Mechanics and Materials 427-429 (September 2013): 949–52. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.949.

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Before putting air conditioner into market, it must be checked strictly by inspection department. Balanced ambient room-type calorimeter chamber is used to measure the conditioner performance according to energy balance principle. At present, the principle of conservation of energy is a method with higher accuracy for air conditioner test. In this paper, we focus on introducing the measuring method of condensed water in the test system after explaining the principle of the air conditioning performance test balanced ambient room-type calorimeter chamber. it is used to balance the capacity measu

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Alduqri, Y. A., and Md Nor Musa. "Theoretical Study of a Novel Four-Chamber Rotary Compressor: Design and Thermodynamic Analysis." Applied Mechanics and Materials 819 (January 2016): 46–57. http://dx.doi.org/10.4028/www.scientific.net/amm.819.46.

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A novel four-chamber rotary compressor (FCRC) is being developed for a refrigerator and an air-conditioning system. The novelty lies in the usage of three rotating sleeves and two oppositely installed vanes each has one end fixed to an outer sleeve and the other end to a rotor, respectively. In this paper, the swept volume, the delivered pressure, the work and the power of the FCRC are formulated and analyzed. The compressor configuration and thermodynamic analysis are based on the 174 cc swept volume with R134a as the compressed gas. Considering the encouraging results, added by design simpli

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18

Khaled, Mahmoud, Samer Ali, Hassan Jaber, Jalal Faraj, Rabih Murr, and Thierry Lemenand. "Heating/Cooling Fresh Air Using Hot/Cold Exhaust Air of Heating, Ventilating, and Air Conditioning Systems." Energies 15, no. 5 (2022): 1877. http://dx.doi.org/10.3390/en15051877.

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This paper suggests a heat recovery concept that is based on preheating/precooling the cold/hot fresh outside air by means of the relatively hot/cold exhaust air in winter/summer weather conditions. To investigate the feasibility of such a concept, an experimental setup is established to simulate conditions similar to an All-Air HVAC system. The prototype consists of a 6.7-m3 air-conditioned chamber by means of a split unit of 5.3-kW capacity. The heat recovery module consists of a duct system that is used to reroute the exhaust air from a conditioned chamber to flow through the fin side of a

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Prokhorov, V. I., S. V. Troyanchuk, and M. A. Razakov. "Particularities of Exergy Analysis in Air Conditioning Systems." Science & Technique 21, no. 1 (2022): 42–49. http://dx.doi.org/10.21122/2227-1031-2022-21-1-42-49.

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The paper examines two methods of choosing the initial reference point for exergy of the moist air flow. The first method is characterized by a zero exergy value at the current temperature and humidity of the outdoor air, which are variable both in daily and annual periods. Another is characterized by constant values of parameters of moist indoor air (its temperature and humidity in the room). A comparative study has shown the advantages of the second method: greater stability of values in air processing processes and their convenient presentation on exergy chart. However, it should be noted t

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Surawattanawan, Prakob, and Surasit Polpun. "Dynamic Response Analysis of Start-Up Transient in Air Conditioning System." Applied Mechanics and Materials 423-426 (September 2013): 1577–88. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.1577.

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Dynamic models of the heating, ventilation and air-conditioning (HVAC) systems in a temperature controlled room are very useful for controller design, commissioning, and fault detection and diagnosis. A transient model is a set of time differential equations in mass, energy and momentum balances. These transient equations contain parameter values for validation. The parameter such as thermal capacitances of the room chamber, heat transfer coefficient of room panel, heat transfer coefficient of evaporator are difficult to determine because they are related to unsteady condition and have to be c

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Dmytrochenkova, E. "ANALYSIS OF THE ENERGY, ECONOMIC AND ENVIRONMENTAL EFFICIENCY OF AIR CONDITIONING SYSTEMS WITH DIRECT AND INDIRECT EVAPORATIVE COOLING." Innovative Solution in Modern Science 2, no. 46 (2021): 16. http://dx.doi.org/10.26886/2414-634x.2(46)2021.2.

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The article is devoted to the analysis of energy, economic and environmental efficiency, which are achieved by using indirect adiabatic cooling of air in the central air conditioner instead of direct cooling. Two corresponding schematic diagrams of air conditioning systems are considered. As a result of the calculations, it was found that indirect adiabatic cooling of the air makes it possible to reduce the consumption of cold and electricity by 65%. The monetary equivalent of reducing energy consumption can reach UAH 14,760 for 4 months of operation of the air conditioning system in cooling m

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Kim, Minjun, Hyojun Kim, Jinhyun Lee, and Younghum Cho. "Development of Mixing Temperature Prediction Model for Single-Duct Variable Air Volume System Using CFD." Applied Sciences 14, no. 22 (2024): 10549. http://dx.doi.org/10.3390/app142210549.

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The purpose of this study was to determine the annual energy consumption that can be attributed to heating, ventilation, and air conditioning (HVAC) systems’ mixing temperature error. To develop a mixing temperature prediction model for a single-duct variable air volume (VAV) system, the mixing temperature was measured using 15 temperature sensors installed in an HVAC mixing chamber as well as the existing air handling unit’s (AHU) mixing temperature sensor. The mixing chamber was modeled using computational fluid dynamics (CFD), and a coefficient of variation of the root-mean-square error of

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Ahmad Rasdan Ismail, Norfadzilah Jusoh, Nor Kamilah Makhtar, Nor Kamaliana Khamis, Raemy Md Zein, and Nurul Husna Che Hassan. "CFD Study on Thermal Implication towards Human Body in Office Environment." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 85, no. 1 (2021): 125–34. http://dx.doi.org/10.37934/arfmts.85.1.125134.

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Temperatures are rising gradually around the world due to the issue of global warming. This condition also affects those who have to work for long hours. A comfortable work environment helps employees to increase work productivity. Thermal comfort is the occupant’s satisfaction with the surrounding thermal conditions. Therefore, the objective of this study is to evaluate the thermal environmental conditions of air conditioning through Computational Fluid Dynamics simulations. The distributions of environmental parameters such as air velocity, air temperature, radiant temperature, inside an o?c

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Liu, Xiaobo, Zhongcheng Jiang, Xianfeng Wang, and Dengke Li. "Noise distribution law of air-conditioning ducts for metro vehicles." Noise Control Engineering Journal 70, no. 4 (2022): 376–83. http://dx.doi.org/10.3397/1/377030.

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The passenger comforts are directly affected by the air supply uniformity and noise of air-conditioning duct inside the metro vehicle. In order to solve the integrated design problem of air supply uniformity and noise control of air-conditioning ducts, a theoretical model is established to analyze the air supply uniformity, noise attenuation, and airflow regeneration noise of the air-conditioning duct. The distribution law of the sound pressure level along the longitudinal air outlet was calculated, and the calculated results were compared with test ones. For a typical air supply duct with a c

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T, Stanciu. "Aspects regarding the maintenance of climate inside the hyperbaric chamber of the Diving Center." Scientific Bulletin of Naval Academy XIX, no. 1 (2018): 77–84. http://dx.doi.org/10.21279/1454-864x-18-i1-011.

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The climate conditioning of a hyperbaric chamber is extremely important, as the health or even lives of the divers depend on it. Climate conditioning consists of controlling and maintaining the following factors inside the enclosure:  Temperature  Humidity  The parameters of the breathing gas In this paper I have analyzed some of the aspects regarding the thermo-hygrometric phenomena and the composition of the breathing gas mix, phenomena that accompany any dive in saturation. The variation in temperature and humidity under pressure and during decompression differs from the unitary dives wi

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Semenov, A. E., A. I. Andreev, and A. A. Tsyplakov. "Simulation of operating modes of the refrigerating machine and the heat pump when drying fish." IOP Conference Series: Earth and Environmental Science 866, no. 1 (2021): 012031. http://dx.doi.org/10.1088/1755-1315/866/1/012031.

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Abstract Saving energy resources in the fishing industry is an important task. The purpose of the study is to determine rational schemes and operating modes of air conditioning systems for drying fish. The methodology for calculating the air conditioning system for drying fish and on its basis a computer program in the mathematical package MathCAD is developed. Two air conditioning schemes are considered: a scheme using an air heater and a chiller and a scheme using a chiller and a heat pump. The schemes were analyzed from the standpoint of energy indicators. The parameters of the air supplied

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FABER, Joanna, Krzysztof BRODZIK, Damian ŁOMANKIEWICZ, Anna GOŁDA-KOPEK, Jan NOWAK, and Antoni ŚWIĄTEK. "Temperature influence on air quality inside cabin of conditioned car." Combustion Engines 149, no. 2 (2012): 49–56. http://dx.doi.org/10.19206/ce-117040.

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In present work results of researches on influence of temperature on air quality inside vehicle are presented. One new car was tested in different atmospheric conditions, after conditioning in climate chamber. Air quality was evaluated on the basis of detected volatile organic compounds (VOC) and calculated as toluene equivalent. Samples were collected onto solid sorbents and examined, after thermal desorption, with the use of gas chromatography (GC) method with flame ionisation (FID) and mass spectrometry (MSD) detectors.

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Gómez-Suárez, Cristina, Henk J. Busscher, and Henny C. van der Mei. "Analysis of Bacterial Detachment from Substratum Surfaces by the Passage of Air-Liquid Interfaces." Applied and Environmental Microbiology 67, no. 6 (2001): 2531–37. http://dx.doi.org/10.1128/aem.67.6.2531-2537.2001.

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ABSTRACT A theoretical analysis of the detachment of bacteria adhering to substratum surfaces upon the passage of an air-liquid interface is given, together with experimental results for bacterial detachment in the absence and presence of a conditioning film on different substratum surfaces. Bacteria (Streptococcus sobrinus HG1025,Streptococcus oralis J22, Actinomyces naeslundii T14V-J1, Bacteroides fragilis 793E, andPseudomonas aeruginosa 974K) were first allowed to adhere to hydrophilic glass and hydrophobic dimethyldichlorosilane (DDS)-coated glass in a parallel-plate flow chamber until a d

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Toshmamatov, B.M., L.Z. Temirova, S.R. Baratova, S.U. Safarova, and Sh.Kh. Khusunov. "Analysis of Air Conditioning Schemes based on Evaporative Cooling of Air using Solar Energy." International Journal of Engineering Research & Science 6, no. 5 (2020): 37–41. https://doi.org/10.5281/zenodo.3883758.

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<strong><em>Abstract</em></strong><strong>—</strong> <em>The article presents the calculation method based on the heat and humidity parameters of the units direct and indirect-evaporative cooling in air conditioning systems in buildings are analyzed various technical diagrams. On the basis of experimental and theoretical studies established the benefits of schemes based on indirect-evaporative cooling. The processes of heat and humidity of air treatment, demonstrate the benefits of solar installations with devices indirect evaporative-type compared to conventional solutions</em><em>.</em

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Amoabeng, Lee, and Choi. "Modeling and Simulation Performance Evaluation of a Proposed Calorimeter for Testing a Heat Pump System." Energies 12, no. 23 (2019): 4589. http://dx.doi.org/10.3390/en12234589.

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The energy consumption for heating and cooling in the building sector accounts for more than one-third of total energy used worldwide. In view of that, it is important to develop energy efficient cooling and heating systems in order to conserve energy in buildings as well as reduce greenhouse gas emissions. In both commercial and residential buildings, the heat pump has been adopted as an energy efficient technology for space heating and cooling purposes as compared to conventional air conditioning systems. However, heat pumps undergo standard testing, rating, and certification procedures to a

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Kayar, Ekin Can, and Hasan Özcan. "Air Quality Optimization in Excavator Cabinets Using CFD." Orclever Proceedings of Research and Development 4, no. 1 (2024): 19–29. http://dx.doi.org/10.56038/oprd.v4i1.436.

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Air conditioning systems are vital to the operation of a vehicle. For this reason, earth-moving machinery manufacturers act very sensitively to provide their consumers with a comfortable journey and clean indoor air. In this study, the heating problem of an excavator operator cabinet is discussed. A climatic test chamber was used to perform the heating test. This allows detailed observation of airflow and temperature distributions within the cabinet. The cleaning of the geometric model and the creation of the flow model were carried out in the SpaceClaim program. The numerical mesh was created

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Angelova, Radostina A., Detelin Markov, Rositsa Velichkova, Peter Stankov, and Iskra Simova. "Exhaled Carbon Dioxide as a Physiological Source of Deterioration of Indoor Air Quality in Non-Industrial Environments: Influence of Air Temperature." Energies 14, no. 23 (2021): 8127. http://dx.doi.org/10.3390/en14238127.

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People are the main reason for the deterioration of indoor air quality (IAQ) due to the continuous physiological metabolism processes in their bodies, including respiration. We present results from an investigation of the influence of indoor air temperature on the concentration of exhaled carbon dioxide (CO2). The investigation was preconditioned by previous findings on the effect of air temperature on human metabolism. However, our literature survey showed a lack of studies on the influence of the indoor air temperature on the exhaled CO2 (or metabolic CO2), which leads to the novelty of our

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Malikova, Olga. "Method of power consumption calculation of air conditioning systems on the basis of probability-statistic climate model." E3S Web of Conferences 164 (2020): 02015. http://dx.doi.org/10.1051/e3sconf/202016402015.

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The article discusses the methodology for calculating the annual, seasonal and monthly consumption of heat, cold, electricity and water for air conditioning systems based on the temperatures and enthalpies of outdoor air averaged for each weather zone during the working day according to a probabilistic-statistical climate model. The article contains a brief description of the engineering methodology for quick manual calculation of resource consumption with a comparison of the results when using simplified tables of climatic information about weather zones of various external air purification i

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Lin, Chang-Sheng, Jui-Kai Liu, and Hung-Tse Chiang. "A U-Shaped Oscillatory Liquid Piston Compression Air Conditioner Driven by Rotary Displacer Stirling Engine." Energies 13, no. 16 (2020): 4091. http://dx.doi.org/10.3390/en13164091.

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A rotary displacer, Stirling engine-driven, oscillatory liquid piston-compression air conditioning unit is analyzed, designed, and conceptually proved by experiments on its cooling capability and performance efficiency. The engine itself aims to work compatibly with a conventional solar water heater as its power source, with a rotary displacer to manipulate its operation frequency. A U-shaped, oscillatory liquid piston, with the cylinder chamber vented to low pressure, aims to both reduce the sealing friction and serve as the refrigerant. During the experiments, the engine is fed with an elect

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Conceição, Eusébio, Ma Inês Conceição, João Gomes, Manuela Lúcio, and Hazim Awbi. "Influence of the Ceiling Mounted Localized Air Distribution System Performance in the Human Body." E3S Web of Conferences 362 (2022): 14002. http://dx.doi.org/10.1051/e3sconf/202236214002.

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This work presents a numerical study of the influence of the ceiling mounted localized air distribution system performance in the human thermal behavior. In his study a coupling of the Computational Fluids Dynamics and the Human Thermal Modelling is used to evaluate the thermal comfort, the indoor air quality and the Draught Risk. The input data, of the coupling numerical models, are evaluated in the Building Dynamics Modelling. The virtual chamber geometry is generated using the Computational Aided Design system and the occupants’ geometry is generated using empirical equations, based on occu

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Lundblad, Lennart K. A., Charles G. Irvin, Andy Adler, and Jason H. T. Bates. "A reevaluation of the validity of unrestrained plethysmography in mice." Journal of Applied Physiology 93, no. 4 (2002): 1198–207. http://dx.doi.org/10.1152/japplphysiol.00080.2002.

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Presently, unrestrained plethysmography is widely used to assess bronchial responsiveness in mice. An empirical quantity known as enhanced pause is derived from the plethysmographic box pressure [Pb( t), where t is time] and assumed to be an index of bronchoconstriction. We show that Pb( t) is determined largely by gas conditioning when normal mice breathe spontaneously inside a closed chamber in which the air is at ambient conditions. When the air in the chamber is heated and humidified to body conditions, the changes in Pb( t) are reduced by about two-thirds. The remaining changes are thus d

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Calmettes, Cyril, Emmanuel Perrey-Debain, Emmanuel Lefrançois, and Julien Caillet. "A multi-port scattering matrix formalism for the acoustic prediction in duct networks." Acta Acustica 7 (2023): 13. http://dx.doi.org/10.1051/aacus/2023013.

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Duct acoustic network modeling is commonly carried out using the transfer matrix formalism which is limited to the low frequency range. The aim of this work is to extend it to higher frequencies by taking into account the multi-mode acoustic propagation. The first step is to compute, via Finite Element Method (FEM), the multi-port multi-modal scattering matrix of each element. The second step is to transform it into a scattering matrix for the acoustic power, relying on assumptions which are often used for the study of medium-to-high frequency broadband noise. The method is applied to typical

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Ye, Kan, Jinchen Ji, and Sam Han. "Semi-active noise control for a hermetic digital scroll compressor." Journal of Low Frequency Noise, Vibration and Active Control 39, no. 4 (2019): 1204–15. http://dx.doi.org/10.1177/1461348419867019.

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Hermetic digital scroll compressor has been widely used as a small-scale organic Rankine cycle application in the heating, ventilation, and air conditioning systems. A clunking noise issue is recently found in an air conditioning outdoor unit, and the main cause of the noise is experimentally identified to be the impact of the scrolls in the compressor unit during the switching process. The semi-active control methods are thus designed to greatly reduce the noise level by using additional valves to adjust the pressure changing rate within the modulation chamber. The response time for the impac

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Supardi, Inra, Zamri Noranai, and Mohammad Zainal M. Yusof. "Air Conditioner Unit with Thermal Energy Storage by Open Loop System." Applied Mechanics and Materials 465-466 (December 2013): 237–41. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.237.

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Energy is very important in our daily activity especially in commercial and industries sector. These requirements have increased from time to time and as the result it is significantly end up with high energy demand and high energy cost. Thermal Energy Storage (TES) can be used as an alternative solution to reduce high energy demand and to reduce energy cost. The main reason of using TES system is to shift high energy demand from peak period to off peak period. Meanwhile, for building owner is to reduce energy cost by take opportunity low cost energy during off peak period. The purpose of this

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Atienza, A. H., R. T. Cervantes, J. A. Dionisio, and T. A. Tan. "Plant growth chamber with integrated air conditioning system, periodic irrigation, and adjustable photosynthetic light wavelength." IOP Conference Series: Materials Science and Engineering 1109, no. 1 (2021): 012066. http://dx.doi.org/10.1088/1757-899x/1109/1/012066.

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Xie, Dong, Ling Tian, Chuck Wah Yu, Maili Liao, and Hanqing Wang. "Indoor thermal environment due to non-steady-state radiation heat transfer of a capillary ceiling radiation cooling system." Indoor and Built Environment 28, no. 4 (2018): 443–53. http://dx.doi.org/10.1177/1420326x18804012.

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The capillary ceiling radiation cooling panel (C-CRCP) is a newly developed terminal device for air conditioning to provide indoor thermal comfort for occupants and to save energy. In this paper, numerical modelling of a room with a C-CRCP system was used to analyze radiant heat transfer under non-steady-state conditions. Experiments were conducted in an environmental chamber to verify simulation results. The chamber was equipped with a C-CRCP, which was covered with gypsumboard. The results showed that the inlet water temperature had a significant influence on ceiling surface temperature. The

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Sun, Yu Ping, and Neng Zhu. "Influence of Temperature and Humidity Control in Air Conditioning on Indoor Environment Quality and Human Feelings." Applied Mechanics and Materials 256-259 (December 2012): 2648–51. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.2648.

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In this study, the oxygen contents of the indoor air quality in different climatic conditions in a chamber were real-time monitored. At the same time, ten young volunteers sit in the three different environment conditions to fill subject feeling questionnaires. The climatic conditions referred to three groups of hot and humid environment (30°C, 35°C, 40°Cdry bulb temperature and 90% relative humidity). The results reveal the oxygen content of indoor air quality slightly decreased in different thermal environments, the values within normal variations. Questionnaire statistic results indicate th

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Banaś, Marian, Mariusz Filipowicz, Krzysztof Lalik, et al. "The use of mathematical modeling for the construction of a control system for a climate chamber." New Trends in Production Engineering 2, no. 1 (2019): 562–69. http://dx.doi.org/10.2478/ntpe-2019-0061.

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Abstract Due to the introduced political instruments, as well as the increase in awareness and standard of living, mechanical ventilation is becoming more and more popular in Poland. The growing market and standards force the manufacturers of air handling units to constantly improve the quality of their products. In order to verify the operation of these devices, it is necessary in a specially adapted for this object called the climate chamber. Due to the strict regulations regarding the working conditions of the said facilities, it is necessary to apply the processes of advanced control syste

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Tan, C. B., B. V. Yang, M. B. Koe, et al. "Design and fabrication of a heat pump flatbed dryer for paddy drying." IOP Conference Series: Earth and Environmental Science 1500, no. 1 (2025): 012036. https://doi.org/10.1088/1755-1315/1500/1/012036.

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Abstract Paddy drying is a crucial step in rice production as it greatly affects the quality and yield of rice. One of the largest rice producing countries, the Philippines, is facing issues in paddy drying especially during rainy seasons. This has been a challenge to the agricultural sector as it causes significant losses to both farmers and the economy. In response, a heat pump flatbed dryer (HPFD) was designed utilizing a recycled air conditioning unit. The drying chamber of the HPFD was fabricated using stainless steel sheets and fiberglass insulation. The chamber’s dimensions were designe

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Shi, Chuan, Zhen Wang, Qian Liang, Ziwei Wan, and Qingsong Ma. "Research on Design of Collective Housing with Air-Circulation Central Air-Conditioning System Based on Solar Energy Utilization." Sustainability 17, no. 5 (2025): 2089. https://doi.org/10.3390/su17052089.

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The article presents an innovative design schema for air circulation within collective housing, which effectively reduces energy consumption and improves the indoor environment. It also solves the problem of the high operating and maintenance costs caused by the simultaneous installation of air conditioners and radiators. Employing dynamic energy consumption calculation software THERB for HAM, the energy-saving benefits of this design are simulated. The strategy involves capturing heat within the sunspace and transferring it to the conditioning chamber, from where the air is tempered and circu

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Bundo, Jonadri, Donald Selmanaj, Genci Sharko, Stefan Svensson, and Orion Zavalani. "A Simulation-Based Comparative Study of Advanced Control Strategies for Residential Air Conditioning Systems." Eng 6, no. 8 (2025): 170. https://doi.org/10.3390/eng6080170.

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This study presents a simulation-based evaluation of advanced control strategies for residential air conditioning systems, including On–Off, PI, and Model Predictive Control (MPC) approaches. A black-box system model was identified using an ARX(2,2,0) structure, achieving over 90% prediction accuracy (FIT) for indoor temperature and power consumption. Six controllers were implemented and benchmarked in a high-fidelity Simscape environment under a realistic 48-h summer temperature profile. The proposed MPC scheme, particularly when incorporating outdoor temperature gradient logic, reduced energ

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Wonorahardjo, Surjamanto, Inge Sutjahja, Daniel Kurnia, Zulfikar Fahmi, and Widya Putri. "Potential of Thermal Energy Storage Using Coconut Oil for Air Temperature Control." Buildings 8, no. 8 (2018): 95. http://dx.doi.org/10.3390/buildings8080095.

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The role of thermal mass in indoor air-cooling during the day is a common area of study, which is particularly relevant for an era characterized by energy crises. Thermal energy storage (TES) technologies for application in rooms and buildings are not well developed. This study focuses on the use of coconut oil (co_oil) as a temperature control agent for room air conditioning systems in tropical countries such as Indonesia, given its capability to store large amounts of heat at temperatures around its melting point. Heat exchange studies between co_oil and the air environment were performed by

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Chang, Tong-Bou, Jer-Jia Sheu, and Jhong-Wei Huang. "High-Efficiency HVAC System with Defog/Dehumidification Function for Electric Vehicles." Energies 14, no. 1 (2020): 46. http://dx.doi.org/10.3390/en14010046.

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Electric vehicles (EVs) generally use an electric heating system to provide heat. However, the heating system consumes a large amount of energy, and therefore reduces the mileage of the vehicle. The energy consumption can be reduced by replacing the electric heating system with a heat pump air conditioning system. Such systems achieve an effective heating of the vehicle interior, but do not provide a defog or dehumidification function. Consequently, the inside surface of the windshield tends to fog in cold weather; leading to poor driver visibility and an impaired road safety. Accordingly, the

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Ullah, Sibghat, and Muzaffar Ali. "Performance Assessment of Solar Desiccant Air Conditioning System under Multiple Controlled Climatic Zones of Pakistan." Energies 16, no. 19 (2023): 6914. http://dx.doi.org/10.3390/en16196914.

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Over the past decade, the integration of desiccant technology with evaporative cooling methods has proven to be highly effective and efficient in providing comfortable indoor environments. The performance of desiccant-based direct evaporative cooling (DEC) systems is strongly influenced by environmental conditions, and their output behavior varies across multiple climatic zones. It is not easy to assess the system performance in numerous climatic zones as it is a time-consuming process. The current study focuses on determining the feasibility of a solid desiccant integrated with a direct evapo

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Windy H. Mitrakusuma, Apip Badarudin, Susilawati, Hafidz Najmudin, and Andriyanto Setyawan. "Performance of Split-type Air Conditioner under Varied Outdoor Air Temperature at Constant Relative Humidity." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 90, no. 2 (2022): 42–54. http://dx.doi.org/10.37934/arfmts.90.2.4254.

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Studies related to the effects of ambient temperature on the performance of an air conditioning unit have been carried out for decades. However, specific study concerning the effect of varied ambient temperature under constant relative humidity has not been reported yet. This paper discusses the operating conditions and performance of an air conditioner with R32 and nominal capacity of 2.6 kW. The test was carried out in a controlled psychrometric chamber under constant relative humidity of 50% and varied outdoor air temperature from 24 to 38°C. The increase of outdoor air temperature affects

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