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Journal articles on the topic 'Useful Heat Gain'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Langston, Lee S. "A Useful Equation for Gas Turbine Design." Mechanical Engineering 140, no. 03 (2018): S52—S53. http://dx.doi.org/10.1115/1.2018-mar-8.

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This article presents three different gas turbine phenomena and design cases. The sketch in the article shows a schematic of a combined cycle powerplant consisting of a Brayton cycle (gas turbine) whose exhaust provides energy to a Rankine cycle (steam turbine). Frequently, one can use simple but exact one-dimensional (1D) heat conduction solutions to estimate the heat loss or gain of gas turbine components under transient conditions. These easy-to-use solutions are found in most undergraduate heat transfer texts. The article suggests that those three widely different gas turbine phenomena and

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Ponomarev, N. S., A. Yu Martianova, and Yu A. Dmitriev. "Assessment of heat gain from server equipment." Вестник гражданских инженеров 18, no. 2 (2021): 166–72. http://dx.doi.org/10.23968/1999-5571-2021-18-2-166-172.

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Blade server architecture is widely used as server hardware for datacenters. This article proposes methods for calculating thermal radiation from blade servers at the design and operation stages. In particular, the method for calculating heat gain at the design stage can be used to select equipment for the air conditioning system. The method for calculating heat gains at the operational stage with the current load of IT equipment can be useful for analyzing the operation of existing air conditioning systems or analyzing the energy efficiency of IT equipment in a specification.

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López-Smeetz, Carmen, Arsenio Barbón, Luis Bayón, and Covadonga Bayón-Cueli. "Experimental Investigation of the Influence of Longitudinal Tilt Angles on the Thermal Performance of a Small-Scale Linear Fresnel Reflector." Applied Sciences 14, no. 9 (2024): 3666. http://dx.doi.org/10.3390/app14093666.

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This paper analyses the influence of the longitudinal tilt angle of the secondary system of a low-concentration photovoltaic system based on a small-scale linear Fresnel reflector. Several evaluation indicators, such as useful heat gain, thermal efficiency, incident solar irradiance gain on the photovoltaic cells, and total useful energy gain, were evaluated for five wind speed conditions and six locations in the Northern Hemisphere. The tests were performed with two small-scale linear Fresnel reflector configurations: the classical large-scale linear Fresnel reflector configuration (base conf

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Gade, Bhavani Shankar, and P.S.Kishore. "PERFORMANCE ANALYSIS OF A CONVENTIONAL AIR HEATER." International Journal of Research - Granthaalayah 5, no. 4 (2017): 320–33. https://doi.org/10.5281/zenodo.573004.

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Solar energy constitutes one of the main alternatives for facing the energy problems of the future. Solar air heaters are used for applications at low and moderate temperatures. Such as crop drying, timber seasoning, space heating, and drying agriculture products. Artificial geometry applied on the absorber plate is the very efficient method to improve thermal performance of solar air heaters. The thermal efficiency of solar air heaters is generally poor due to low heat transfer coefficient between the absorber plate and air flowing in the collector. Thermal performance of the conventional sol

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Meena, Sunita, Chandan Swaroop Meena, and V. K. Bajpai. "Relation between Collector Efficiency Factor and the Centre to Centre Distance of Absorber Tubes of Solar Flat-Plate Collector." Applied Mechanics and Materials 592-594 (July 2014): 2404–8. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.2404.

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Solar energy collectors are a special kind of heat exchangers that transform solar radiation energy to internal energy of the transport medium. The major component of any solar system is the solar collector. This is a device which absorbs the incoming solar radiation, converts it into heat, and transfers this heat to a fluid (usually air, water, or oil) flowing through the collector. The measurement of the flat plate collector performance is the collector efficiency. The collector efficiency is the ratio of the useful energy gain to the incident solar energy over a particular period of time. T

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Sudia, Budiman, Lukas Kano Mangalla, Samhuddin, and Wa Ode Zulkaidah. "ANALISIS PERPINDAHAN PANAS PADA KOLEKTOR PLAT DATAR SEBAGAI SUMBER ENERGI TERMAL PADA PENGERING TIPE RAK." DINAMIKA: Jurnal Ilmiah Teknik Mesin 10, no. 2 (2019): 47–52. https://doi.org/10.5281/zenodo.3036968.

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Solar collectors are devices that convert solar radiation energy into thermal energy which is used for  various purposes. This study is used to determine the heat in the flat plate collector as a source of thermal energy. Data collection was carried out at Kambu, Kendari City with a latitude of 4<sup>0</sup> LS, in May 2018. The intensity of solar radiation measured  using solar power meter : collector temperature measured using a thermocouple type CC (Cooper Constanta), wind speed  measured using anemometer,  the ambient temperature uses a mercury air thermometer. The Resu

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Hamidi, Saad Tami, Jamal Abdul-Kareem Mohammed, and Laith Mohsen Reda. "Thermal Performance Analysis of Parabolic Trough Solar Concentrator with Helical Tube Receiver." Al-Nahrain Journal for Engineering Sciences 21, no. 3 (2018): 374–83. http://dx.doi.org/10.29194/njes.21030374.

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In this paper, the experimental thermal performance for a parabolic trough solar concentrator (PTSC) combined with helical tube receiver and directed by two axes solar tracking system at different amount of water flow rates has been analyzed. The experimental test results of thermal performance with regard to temperature rise of water, useful heat gain and collector thermal efficiency for the PTSC prototype at controlled water flow rates (2.3, 22.5 and 29.4 L/h) are collected. The results show that the increase of water mass flow rates causes decrease in the average water output temperature as

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Nhut, Le Minh, and Youn Cheol Park. "A Simulation Model for Predicting the Performance of Solar Domestic Hot Water System." Advanced Materials Research 512-515 (May 2012): 230–33. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.230.

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The article deals with the modeling and simulation aspects of the performance improvement of a solar domestic hot water system. A mathematical model of this system is carried out to predict its operating performance under specified weather conditions of Jeju Island, Korea. The optimum mass flow rate through collector based on the relationship between the useful heat gain of solar collector and the electricity consumption of solar pump is investigated. Besides, the effect of various parameters such as solar collector area, initial water temperature and volume of storage tank is analyzed. The re

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Alkam, M. K., and M. A. Al-Nimr. "Solar Collectors with Tubes Partially Filled with Porous Substrates." Journal of Solar Energy Engineering 121, no. 1 (1999): 20–24. http://dx.doi.org/10.1115/1.2888137.

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In this work, the thermal performance of a conventional collector is improved by inserting porous substrates at the inner walls of the collector tubes. The porous substrates improve the convective heat transfer coefficient between the tube wall and the fluid. This improvement is investigated numerically and its effects on the efficiency and the useful gain of the collector are evaluated. It is found that inserting the porous substrate may raise the collector efficiency considerably, especially at high values of the overall heat loss coefficient.

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Hamood, Hasson S., Badran M. Salim, and Nabeel M. Abdulrazzaq. "THE ORATICAL ANALYSIS OF FLAT PLATE SOLAR COLLECTOR PLACED IN MOSUL CITY BY USING DIFFERENT ABSORBING MATERIALS AND FLUIDS." Kufa Journal of Engineering 6, no. 2 (2015): 1–12. http://dx.doi.org/10.30572/2018/kje/621152.

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In this paper, a mathematical model and simulation of flat plate solar collector are developed. The weather data, which used in the calculations of the performance of the collector, is for Mosul city. Detailed energy analyses were carriedout for evaluating the efficiency and useful heat gain of a typical flat plate solar collector under certain operation and design conditions. In this analysis, different fluids and different absorbing materials were used to indicate their effect on the performance of flat plate solar collector. Operating parameters, which considered as variables, are the mass

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Lobanov, D., I. Zvenigorodskiy, M. Svirin, S. Safonov, and A. Seminenko. "DETERMINATION OF HEAT GAIN FROM A PERSON, TAKING INTO ACCOUNT ENERGY CONSUMPTION AND PHYSICAL ACTIVITY." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 8, no. 1 (2023): 42. http://dx.doi.org/10.34031/2071-7318-2022-8-1-42-42.

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The analysis of the current regulatory documents and reference and methodological literature used in carrying out calculations related to the determination of heat emissions from people engaged in various types of work is carried out. The incomplete correspondence of the values of heat emissions to the characteristics of the severity of the work performed for various types of activities, taking into account the age of people with their physique corresponding to normal body weight, was revealed. The calculated values of the coefficient of physical activity for a conditional person, as well as t

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Jadallah, Abdullateef A., Mohammed K. Alsaadi, and Saeef A. Hussien. "The hybrid (PVT) double-pass system with a mixed-mode solar dryer for drying banana." Engineering and Technology Journal 38, no. 8A (2020): 1214–25. http://dx.doi.org/10.30684/etj.v38i8a.535.

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In this paper, the hybrid PVT double pass system with a mixed-mode solar dryer type under forced convection has been designed, fabricated and installed for drying crops. The dryer was tried by drying 300 grams of banana slices in the air temperature of dryer range from 43.2 to 60.2°C. The initial moisture rate of banana was about 78% and the most dropped in moisture content was from 78% to 33% after 8 hours of the drying process. The banana slices are distributed in two identical trays and it was noticed that the most and least decreasing in weight of banana samples was from 150 to 48 gram and

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Kunelbayev, Murat, Madina Mansurova, Gulnur Tyulepberdinova, Talshyn Sarsembayeva, Sulu Issabayeva, and Darazha Issabayeva. "Comparison of the parameters of a flat solar collector with a tubular collector to ensure energy flexibility in smart buildings." International Journal of Innovative Research and Scientific Studies 7, no. 1 (2024): 240–50. http://dx.doi.org/10.53894/ijirss.v7i1.2605.

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This study examines the application and implementation of energy-efficient measures and strategies for use in buildings aimed at achieving the goal of virtually zero energy consumption by buildings. In particular, the aim of the study is to introduce integrated solar devices into the building, functioning as a functional component of the structure for heat storage, in order to increase the flexibility of the structure while maintaining comfortable conditions inside. This article discusses an experimental comparison of flat and tubular solar collectors in the southern and northern regions of Ka

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Agrawal, Bhawna, Pallavi Agrawal, and Suman Agrawal. "Mathematical Modelling of Single Glazed and Double Glazed Solar Air Heater." International Journal of Innovative Technology and Exploring Engineering 10, no. 3 (2021): 34–42. http://dx.doi.org/10.35940/ijitee.c8363.0110321.

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This paper focuses on Mathematical Modelling of Single Glazed and Double Glazed Solar air heater (SAH) which is special kind of heat exchanger that transfers thermal energy from the solar radiation to the fluid flowing inside of the collector. The most potential applications of SAH is the supply of hot air for heating of buildings, to maintain a comfortable environment especially in the winter season, air preheating, desiccant refrigeration, and drying of vegetables, fruits, meat, textile and marine products. Solar radiation intensity is less in the morning that increase gradually till noon an

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Bhawna, Agrawal, Agrawal Pallavi, and Agrawal Suman. "Mathematical Modelling of Single Glazed and Double Glazed Solar Air Heater." International Journal of Innovative Technology and Exploring Engineering (IJITEE) 10, no. 3 (2021): 34–42. https://doi.org/10.35940/ijitee.C8363.0110321.

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This paper focuses on Mathematical Modelling of Single Glazed and Double Glazed Solar air heater (SAH) which is special kind of heat exchanger that transfers thermal energy from the solar radiation to the fluid flowing inside of the collector. The most potential applications of SAH is the supply of hot air for heating of buildings, to maintain a comfortable environment especially in the winter season, air preheating, desiccant refrigeration, and drying of vegetables, fruits, meat, textile and marine products. Solar radiation intensity is less in the morning that increase gradually till noon an

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Gopalsmy, Vijayan, and R. Karunakaran. "EXPERIMENTAL INVESTIGATION ON PARABOLIC TROUGH SOLAR COLLECTOR HOT WATER GENERATION SYSTEM." JOURNAL OF ADVANCES IN CHEMISTRY 13 (January 22, 2017): 09–16. http://dx.doi.org/10.24297/jac.v13i0.5599.

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In this work, we investigated the performance of parabolic trough solar collector with hot water generation system for 3 days day time. We observed the differences in temperature in the range of 6.7°C to 24°C. The average beam radiation during the testing period is 658W/m2. The temperature difference, useful heat gain, wind velocity, direct beam radiation, absorber temperature and solar flux are found in the test period from 9.00 a.m to 16.00 p.m.

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Kombate, Yao, Kokou N’wuitcha, Komlan Déla Donald Aoukou, et al. "Comparative numerical study of the energy performance of two different configurations of a hybrid photovoltaic/thermal air collector." Edelweiss Applied Science and Technology 8, no. 6 (2024): 3902–24. http://dx.doi.org/10.55214/25768484.v8i6.2846.

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Solar energy is a renewable alternative to fossil fuels. When solar energy is converted into electricity by photovoltaic (PV) solar modules, the heat generated increases the temperature of the PV solar cells and, as a result, reduces their electrical efficiency. Several techniques are used to cool PV solar cells in order to reduce their operating temperature. One technique is the use of hybrid photovoltaic/thermal (PVT) solar collectors, which simultaneously produce electricity and useful heat. In the airflow channel, the heat and mass transfer equations and those derived from the energy balan

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18

Choi, Hojong. "Stacked Transistor Bias Circuit of Class-B Amplifier for Portable Ultrasound Systems." Sensors 19, no. 23 (2019): 5252. http://dx.doi.org/10.3390/s19235252.

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The performance of portable ultrasound systems is affected by the excessive heat generated by amplifiers, thereby reducing the sensitivity and resolution of the transducer devices used in ultrasound systems. Therefore, the amplifier needs to generate low amounts of heat to stabilize portable ultrasound systems. To properly control the amplifier, the related bias circuit must provide proper DC bias voltages for long time periods in ultrasound systems. To this end, a stacked transistor bias circuit was proposed to achieve a relatively constant amplifier performance irrespective of temperature va

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19

Mattos, Lucas Prado, Manuel Ernani Cruz, and Julián Bravo-Castillero. "Finite element computation of the effective thermal conductivity of two-dimensional multi-scale heterogeneous media." Engineering Computations 35, no. 5 (2018): 2107–23. http://dx.doi.org/10.1108/ec-11-2017-0444.

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Purpose The simulation of heat conduction inside a heterogeneous material with multiple spatial scales would require extremely fine and ill-conditioned meshes and, therefore, the success of such a numerical implementation would be very unlikely. This is the main reason why this paper aims to calculate an effective thermal conductivity for a multi-scale heterogeneous medium. Design/methodology/approach The methodology integrates the theory of reiterated homogenization with the finite element method, leading to a renewed calculation algorithm. Findings The effective thermal conductivity gain of

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Chávez-Bermúdez, Irving A., Norma A. Rodríguez-Muñoz, Eduardo Venegas-Reyes, Loreto Valenzuela, and Naghelli Ortega-Avila. "Thermal Performance Analysis of a Double-Pass Solar Air Collector: A CFD Approach." Applied Sciences 12, no. 23 (2022): 12199. http://dx.doi.org/10.3390/app122312199.

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Solar air heaters can reduce climate change by replacing conventional fossil fuel-burning technologies in drying and space heating applications. Concentrating solar technologies, such as compound parabolic concentrators, allow air temperatures up to 120 °C; however, it is desirable to improve their heat transfer to reduce the space requirements for their installation. In this work, a parabolic concentrator composed of a flat receiver designed to recover heat from the cover–receiver–reflectors cavity is analyzed, operating it as a U-shape double pass solar heater. With this operation, first, th

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Kong, H. S., and M. F. Ashby. "Friction-Heating Maps and Their Applications." MRS Bulletin 16, no. 10 (1991): 41–48. http://dx.doi.org/10.1557/s0883769400055822.

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Friction is often a nuisance, but it can be useful too. Brakes, clutches, and tires rely on it, of course, though the inevitable fractional heat remains a problem. Other applications use frictional heat: friction cutting and welding, skiing, skating, and curling. The damage to magnetic disks caused by head-disk contact and the striking of matches are also examples.This article illustrates a framework where the thermal aspects of friction can be analyzed in an informative way. It uses a unified approach to the calculation of flash and bulk heating, and a helpful diagram—the frictional temperatu

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Xiong, Yijie, Richard S. Gates, Jiaying Hu, Patricia Y. Hester, and Heng-wei Cheng. "Design and Performance of an Experimental Cooled Perch System for Heat Stress Relief of Laying Hens." Transactions of the ASABE 63, no. 4 (2020): 1109–21. http://dx.doi.org/10.13031/trans.13672.

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This article summarizes the design and performance of a cooled perch system for laying hens during heat stress.Water flow rates, perch loop water temperatures, and system net heat gain are provided.The average daily net heat absorption data, useful for sizing thermal water storage and chiller capacity in future applications, is 256 W m-1 perch length, or 43.2 W per hen housed.This analysis provides a baseline for future cooled perch system design in other application settings.Abstract. This article summarizes the engineering design and performance of a cooled perch system used in a multi-year

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Govindarajan, Rajarajan, Martin Zubeil, Kathleen Siefert, Christophe Ageorges, and Karl Roll. "Simulation of Heat Assisted Forming of Commercial Aluminium Alloy AA5182." Key Engineering Materials 473 (March 2011): 675–82. http://dx.doi.org/10.4028/www.scientific.net/kem.473.675.

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To improve the formability of commercial aluminium alloy AA5182, a new heat assisted forming method is used. The process sequence of this method is; cold forming (pre-forming, 90 to 95% of final shape), heat treatment and cooling it down to room temperature and final cold forming. AA5182 is a non-heat treatable alloy and hence heat treating a strain hardened non-heat treatable aluminium alloy leads to lose in strength and gain in plastic recovery. Therefore by heat treating a preformed part and then following it up by further forming stages, it not only gains the lost strength back but also sh

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Al-Sagan, Ahmed A., Abdullah H. Al-Yemni, Alaeldein M. Abudabos, Abdulaziz A. Al-Abdullatif, and Elsayed O. Hussein. "Effect of Different Dietary Betaine Fortifications on Performance, Carcass Traits, Meat Quality, Blood Biochemistry, and Hematology of Broilers Exposed to Various Temperature Patterns." Animals 11, no. 6 (2021): 1555. http://dx.doi.org/10.3390/ani11061555.

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Improving broilers’ production in the hot region is essential to overcome heat-stress challenges. The current experiment examined the effects of betaine’s fortification (0.0, 0.075, 0.10, and 0.15%) to broiler chickens during days 1–40 of age. The growth period was divided into the starter (1–18 d) and growing-finishing (19–40 d). During the starter period, there was no heat challenge, and all birds were kept under the same conditions. At 18 days of age, half of the birds were kept under thermos-neutral temperature (TN, 22–24 °C), while the other half were kept under high temperature (HT, 35 °

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BERNARD, Pierre. "Impact of process parameters and heat treatment on mechanical properties of Ti64 LBM." MATEC Web of Conferences 321 (2020): 03007. http://dx.doi.org/10.1051/matecconf/202032103007.

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Titanium is a very useful material for aerospace part manufacturing due to its mechanical properties and its lightness. Additive layer manufacturing (ALM), and amongst it Laser Beam Melting (LBM), is a new tool to manufacture parts that have a certain degree of complexity. It allows for the reducing of lead time, as well as reduces the development cycle. The aerospace industry is using more and more this tool to manufacture parts, either for development or for production. With that in mind, Ti64 was developed in Vernon in order to manufacture parts for the Ariane propulsion engines. Certain pa

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Rochman, Syaiful, Algiranto Algiranto, Aprilita Ekasari, and Botir T. Turaqulov. "DEVELOPMENT OF STUDENT WORKSHEETS INTEGRATED WITH PBL-STEM ON TEMPERATURE AND HEAT MATERIAL." EduFisika: Jurnal Pendidikan Fisika 9, no. 2 (2024): 237–46. http://dx.doi.org/10.59052/edufisika.v9i2.36817.

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The purpose of this study is to create a Problem Based Learning approach integrated with Science, Technology, Engineering, and Mathematics (STEM), especially in the field of Physics. The goal is to improve students' creative thinking skills in learning about temperature and heat. The resulting Student Worksheets will be designed to be valid, practical, and effective. This study involves research and development activities using a 4-D model consisting of the stages of definition, design, development, and dissemination. This research was conducted at SMP Muhammadiyah Kartosentanan in the 2023/20

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فرمان, عبد السلام. "SUN SHADOW ANGLES FOR ARCHITECTCS With special reference to The UAE." Journal of Engineering 14, no. 04 (2024): 519–39. http://dx.doi.org/10.31026/j.eng.2008.04.01.

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Often the greatest source of heat gain is the solar radiation entering throughwindows. Heat is then trapped in; because of the "greenhouse effect" shading thewindows is one of the most effective method within the reach of the architect forreducing this heat gain. This is nowhere more necessary than in a country like the U.A.E.but we find the architects here often ignoring this important environmental aspect ofdesign. This is partly due to the lack of relevant local meteorological data plus thecomplexity of the procedure involved ;and partly due to the misconception that suchaspect looses much

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Altaf, Madeeha, and Frances Hill. "IDENTIFYING OPTIMUM GLAZING PROPERTY FOR CONSERVING ENERGY IN HOT SEMI-ARID CLIMATE REGIONS." Journal of Green Building 16, no. 1 (2021): 91–101. http://dx.doi.org/10.3992/jgb.16.1.91.

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ABSTRACT Globally, the building sector is responsible for 40% of energy use and 30% of GHG emissions. The greatest portion of the energy is used during the operational phase (use stage) of buildings. The building envelope, especially the glazed components, plays an important role in determining the energy requirement of buildings. These glazed parts of the building envelope exposed to direct solar radiation are most vulnerable to heat loss and gain. Heat loss and gain through the glazing material depend on glazing properties (U-value, SHGC, VT) and building energy use changes according to the

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Seo, Kun-Ho, Jaewoon Jeong, and Hyunsook Kim. "Synergistic Effects of Heat-Killed Kefir Paraprobiotics and Flavonoid-Rich Prebiotics on Western Diet-Induced Obesity." Nutrients 12, no. 8 (2020): 2465. http://dx.doi.org/10.3390/nu12082465.

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The synergistic anti-obesity effect of paraprobiotic heat-killed lactic acid bacteria (HLAB) and prebiotics has not been studied. To determine the anti-obesity properties of prebiotic polyphenol-rich wine grape seed flour (GSF) and paraprobiotic HLAB, C57BL/6J mice were administered a high-fat and high-fructose diet (HFFrD) with 5% microcrystalline cellulose (CON), HFFrD supplemented with 2.5% GSF, HFFrD with orally administered HLAB, or HFFrD with a combination of GSF and orally administered HLAB (GSF+HLAB) for 8 weeks. Compared with the CON group, the GSF and HLAB groups both showed signific

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DENYS, SIEGFRIED, JAN G. PIETERS, and KOEN DEWETTINCK. "Computational Fluid Dynamics Analysis for Process Impact Assessment during Thermal Pasteurization of Intact Eggs." Journal of Food Protection 68, no. 2 (2005): 366–74. http://dx.doi.org/10.4315/0362-028x-68.2.366.

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Transient temperature and albumen velocity profiles during thermal pasteurization of intact eggs were studied using a commercial computational fluid dynamics (CFD) package. Simulated temperature profiles were in close agreement with experimental data for eggs of different sizes. Convective heat transfer only occurred in the egg white fraction, and conductive heat transfer only occurred in the yolk. For process assessment, a generally accepted kinetic inactivation model for Salmonella Enteritidis was incorporated into the CFD analysis. Minimum process times and temperatures needed to provide eq

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Mahan, James, and Paxton Payton. "Design and Implementation of a Rainfed Matrix for Cotton." Agriculture 8, no. 12 (2018): 193. http://dx.doi.org/10.3390/agriculture8120193.

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Global production of agricultural products must continue to increase if shortages are to be avoided. While irrigated production is substantial since water available for both current and future production is limited, rainfed production will become increasingly important. In-season weather variability results in instability in rainfed production and in order to gain information on the mechanisms involved and their potential mitigation, it is important to monitor production over a range of possible environmental scenarios. We designed and implemented a rain matrix experimental approach for cotton

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Kumar, Shailesh Ranjan, and Satyendra Singh. "Thermo-Hydraulic Management System Employing Single-Phase Water Flow through Microchannels with Micro-Inserts Added Aiming for Performance Improvement." Processes 11, no. 6 (2023): 1858. http://dx.doi.org/10.3390/pr11061858.

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A microchannel heat exchanger effectively evacuates heat from a confined space. This paper attempts to gain insight into the combinatorial repercussions of simultaneously coupling two factors that affect a microchannel’s performance, of which channel size and micro-insert complexity are the two main contributors. With water as the working fluid, an ANSYS-based numerical analysis was carried out for two distinct channel sizes, 1 and 2 mm, both with and without micro-inserts. The Reynolds numbers varied between 125 and 4992 and between 250 and 9985 for the 1 and 2 mm channels, respectively. For

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Htun, Theingi, and Myo Thet Tun. "Design Calculation of Parabolic Trough Solar Thermal System and Three-phaseTurbo Alternator." International Journal of Electrical and Computer Engineering (IJECE) 5, no. 5 (2015): 939. http://dx.doi.org/10.11591/ijece.v5i5.pp939-947.

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Solar energy can be converted into thermal energy with the help of solar<br />collectors. Electricity can be produced directly from solar energy using<br />photovoltaic devices or indirectly from steam generators using solar thermal collectors to heat a working fluid. This research is using the conversion of solar energy into electricity in a closed cycle driven by natural convection. It would mean that electricity is cheaper than from any other renewable technology and cheaper than from fossil fuels. This paper describes converting thermal energy collected by solar collector to el

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Karthik S and Gokul S. "PERFORMANCE EVALUATION OF SOLAR AIR HEATER USING INCLINE BAFFLES." Journal of Manufacturing Engineering 17, no. 1 (2022): 025–34. http://dx.doi.org/10.37255/jme.v17i1pp025-034.

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To investigate the solar air heater’s (SAH) effectiveness, experiments are conducted using flat plates and artificially roughened plate in terms of Inclined and Winglet baffles over the collector surface. This proposed system collector plate comprises Inclined and Winglet ribs and serves as an artificial roughness generator. Airflow rates of 0.01, 0.02, & 0.03kg/s are used in the experiment. To determine the improvement in the proposed work, the experimental results are compared with flat plate SAH. This proposed work offers greater efficiency, useful energy gain, and lower top heat loss t

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Cáceres, Mauricio, Carlos Avila, and Edgar Rivera. "Thermodynamics-Informed Neural Networks for the Design of Solar Collectors: An Application on Water Heating in the Highland Areas of the Andes." Energies 17, no. 19 (2024): 4978. http://dx.doi.org/10.3390/en17194978.

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This study addresses the challenge of optimizing flat-plate solar collector design, traditionally reliant on trial-and-error and simplified engineering design methods. We propose using physics-informed neural networks (PINNs) to predict optimal design conditions in a range of data that not only characterized the highlands of Ecuador but also similar geographical locations. The model integrates three interconnected neural networks to predict global collector efficiency by considering atmospheric, geometric, and physical variables, including overall loss coefficient, efficiency factors, outlet f

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Joudi, Khalid A., and Hassan N. S. Al-Joboory. "EXPERIMENTAL INVESTIGATION OF INDIVIDUAL EVACUATED TUBE HEAT PIPE SOLAR WATER HEATING SYSTEMS." Journal of Engineering 18, no. 2 (2023): 203–22. http://dx.doi.org/10.31026/j.eng.2012.02.05.

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lar water heating systems with heat pipes of three diameter groups of 16, 22 and 28.5 mm. The first and third groups had evaporator lengths of 1150, 1300 and 1550 mm. The second group had an additional length of 1800 mm. all heat pipes were of fixed condenser length of 200 mm. Ethanol at 50% fill charge ratio of the evaporator volume was used as the heat pipes working fluid. Each heat pipe condenser section was inserted in a storage tank and the evaporator section inserted into an evacuated glass tube of the Owens- Illinois type. The combined heat pipe and evacuated glass tube form an active s

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Hou, W.-S., T.-F. Chuang, E.-C. Hsieh, and Y.-H. Chang. "An analysis of heat insulation efficiency of building outer skins used for green building." Building Services Engineering Research and Technology 33, no. 4 (2011): 407–22. http://dx.doi.org/10.1177/0143624411418153.

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In general, the poor thermal insulation of building materials usually causes elevated room temperature, which not only reduces the comfort of the environment but also adds extra loading to the air conditioner. The objective of this study is to investigate the heat insulation efficiencies of building outer skins used for green building. A total of 25 types of multi-layer cladding materials and 9 types of single-layer skin materials made in Taiwan along with 4 types of overseas multi-layer skin materials were tested using the hot box method (HBM). The above data were then adopted to calculate th

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Vuong, S. T., and S. S. Sadhal. "Growth and translation of a liquid-vapour compound drop in a second liquid. Part 2. Heat transfer." Journal of Fluid Mechanics 209 (December 1989): 639–60. http://dx.doi.org/10.1017/s0022112089003253.

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The present work is a comprehensive theoretical study of the heat transfer associated with a 3-singlet compound drop that is growing because of change of phase. The geometry is the same as in Part 1, i.e. a vapour bubble partially surrounded by its own liquid in another immiscible liquid. The attempt here is to gain fundamental understanding of the transport processes that take place in connection with direct-contact heat exchange. The fluid dynamics associated with its growth and translation is treated in Part 1. Here, that flow field solution is used to obtain the temperature field and hence

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Kılkış, Birol. "Development of an Exergy-Rational Method and Optimum Control Algorithm for the Best Utilization of the Flue Gas Heat in Coal-Fired Power Plant Stacks." Energies 12, no. 4 (2019): 760. http://dx.doi.org/10.3390/en12040760.

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Waste heat that is available in the flue gas of power plant stacks is a potential source of useful thermal power. In reclaiming and utilizing this waste heat without compromising plant efficiency, stacks usually need to be equipped with forced-draught fans in order to compensate for the decrease in natural draught while stack gas is cooled. In addition, pumps are used to circulate the heat transfer fluid. All of these parasitic operations require electrical power. Electrical power has unit exergy of almost 1 W/W. On the contrary, the thermal power exergy that is claimed from the low-enthalpy f

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Moazzam, Ali, Zainab Ijaz, Muhammad Hussain, Nimra Maqbool, and Emad A. Kuffi. "Applications of Fractional-Laplace Transformation in the Field of Electrical Engineering." Journal of Kufa for Mathematics and Computer 10, no. 2 (2023): 70–75. http://dx.doi.org/10.31642/jokmc/2018/100211.

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This study examines the various ways that fractional Laplace transform can be used to solve three different kinds of mathematical equations: the equation of analysis of electric circuits, simultaneous differential equations, and the heat conduction equation. This article how to use the fractional Laplace transform to calculate heat flow in semi-infinite solids in the context of heat conduction. The answers that are developed offer important information about how temperatures vary across time and space. The essay also examines how to analyse electrical circuits using the Fractional Laplace tran

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Journal, Baghdad Science. "Parabolic Trough Solar Collector – Design, Construction and Testing." Baghdad Science Journal 8, no. 2 (2011): 658–65. http://dx.doi.org/10.21123/bsj.8.2.658-665.

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This paper presents the design, construction and investigates an experimental study of a parabolic Trough Solar Collector (PTSC). It is constructed of multi – piece glass mirror to form the parabolic reflector (1.8 m ? 2.8 m) its form were checked with help of a laser and carbon steel rectangular as receiver. Sun tracker has been developed (using two – axis) to track solar PTSC according to the direction of beam propagation of solar radiation. Using synthetic oil as a heat transfer its capability to heat transfer and load high temperature (?400 oc). The storage tank is fabricated with stainles

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He, Xiang-Dong, Sheng Liu, and Haruhiko H. Asada. "Modeling of Vapor Compression Cycles for Multivariable Feedback Control of HVAC Systems." Journal of Dynamic Systems, Measurement, and Control 119, no. 2 (1997): 183–91. http://dx.doi.org/10.1115/1.2801231.

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This paper presents a new lumped-parameter model for describing the dynamics of vapor compression cycles. In particular, the dynamics associated with the two heat exchangers, i.e., the evaporator and the condenser, are modeled based on a moving-interface approach by which the position of the two-phase/single-phase interface inside the one-dimensional heat exchanger can be properly predicted. This interface information has never been included in previous lumped-parameter models developed for control design purpose, although it is essential in predicting the refrigerant superheat or subcool valu

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Chiad, Baha T., Naseer K. Kasim, Falah A.-H. Mutlak, Aed E. Owaid, Rasim A. Ahmed, and Salah S. Abd. "Parabolic Trough Solar Collector – Design, Construction and Testing." Baghdad Science Journal 8, no. 2 (2011): 658–65. http://dx.doi.org/10.21123/bsj.2011.8.2.658-665.

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This paper presents the design, construction and investigates an experimental study of a parabolic Trough Solar Collector (PTSC). It is constructed of multi – piece glass mirror to form the parabolic reflector (1.8 m ? 2.8 m) its form were checked with help of a laser and carbon steel rectangular as receiver. Sun tracker has been developed (using two – axis) to track solar PTSC according to the direction of beam propagation of solar radiation. Using synthetic oil as a heat transfer its capability to heat transfer and load high temperature (?400 oc). The storage tank is fabricated with stainles

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Mohan, Rawat, and N. Singh R. "Thermal Performance of Composite Roof Structures with Insulating Layers in Non-Conditioned Buildings for Hot-Dry Climate." International Journal of Recent Technology and Engineering (IJRTE) 9, no. 3 (2020): 122–27. https://doi.org/10.35940/ijrte.C4272.099320.

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The roof configurations with an insulating layer and their impact on hourly floating temperature analyzed in a hot-dry climate context. A predefined computer program using a modified Fourier admittance method utilized as the primary research. The thermal performance of ten composite roof structures evaluated to obtain optimal roof structure for hot-dry climate, Jodhpur. Nine composite roof structures with an insulation layer and one without insulation layer as the base case were analyzed for the summer months (April-September). The utilization of roof thermal insulation showed a significant in

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Li, Bing, Hong Rui Cao, and Zhi Liang Yang. "Thermal Analysis of Axial Driving System for Numerically Controlled Machine Tool." Applied Mechanics and Materials 86 (August 2011): 879–82. http://dx.doi.org/10.4028/www.scientific.net/amm.86.879.

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In the processing of manufacturing, the rising of temperature caused by friction heat, cutting heat, ambient temperature and other factors will lead to thermal deformation of the driving components of machine tool, so that the correct position between the tool and work piece will be changed. And at the same time, machine tool will lose its intrinsic accuracy and reduce its reliability. Especially in the precision cutting processing, machining errors caused by the thermal deformation of driving system will not be ignored, almost accounting for 40%~70% of the total errors. This paper is aided by

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Cinar, Seda, Michal Krajčík, and Muslum Arici. "Performance Evaluation of a Building Integrated Photovoltaic/Thermal System Combined with Air-to-Water Heat Pump." Applied Mechanics and Materials 887 (January 2019): 181–88. http://dx.doi.org/10.4028/www.scientific.net/amm.887.181.

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This study presents a research of envelope systems entailing elements that use and control incident solar energy to deliver renewable thermal or electric energy to the systems providing heating, ventilation and air conditioning to buildings. A simulation model of an office building was developed in the simulation program TRNSYS. A photovoltaic / thermal system was integrated into the building´s southern facade to generate electricity and to increase the temperature of the air flowing through the channel behind the photovoltaic modules. Subsequently, the electricity generated was used to power

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Abd Salam, Nur Nasuha, Simon Lannon, Noor Dina Md Amin, Hanita Yusof, Muhamad Hanafi Rahmat, and Izudinshah Abd Wahab. "Assessment of Climate Change Impact in Tropical Buildings: Sensitivity Analysis of Light Shelf and Building Design Parameters for Daylighting and Thermal Balance." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 124, no. 1 (2024): 144–59. https://doi.org/10.37934/arfmts.124.1.144159.

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Climate change may lead to more intense sunlight in tropical regions, potentially increasing the daylight available for buildings. While this can enhance natural lighting inside buildings, it may also exacerbate issues such as glare and overheating if not properly managed through shading devices and glazing treatments. Nevertheless, common strategies to mitigate heat gain and glare such as shades and blinds often obstruct natural light, necessitating increased reliance on artificial lighting. The conflicting interplay between daylighting and thermal performance can undermine building performan

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Hazarika, P., Shyam, and A. Gaur. "Exergy assessment of a semi-transparent building integrated photovoltaic facade for mild weather conditions of Srinagar." IOP Conference Series: Earth and Environmental Science 1372, no. 1 (2024): 012087. http://dx.doi.org/10.1088/1755-1315/1372/1/012087.

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Abstract Effective utilization of solar energy reduces the dependence on fossil fuel usage along with achieving the objective of carbon neutrality. The current work aims to numerically assess the performance of a facade based semi-transparent BIPVT system while considering four different weather conditions in a month for the climate of Srinagar, India. In the proposed configuration, the BiSPVT facade serves the dual purpose of generating electrical power gain and providing pre-heated air for space heating. PV module surface was cooled by flowing air through the air channel. Movement of air thr

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Carabaño, M. J. "The challenge of genetic selection for heat tolerance: the dairy cattle example." Advances in Animal Biosciences 7, no. 2 (2016): 218–22. http://dx.doi.org/10.1017/s2040470016000169.

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Exposure of livestock to high heat loads negatively affects animal’s productivity. Genetic selection for heat tolerance using quantitative approaches has been developed by making use of the milk recording information merged with the meteorological information in the test date. The main conclusions of the studies following this approach have been that there is genetic variability in the response to heat stress (HS), that a genotype by environment interaction between thermal comfort and HS conditions exists and that there is a genetic antagonism between HS tolerance and high milk production. Thi

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Chen, Duowen. "Temperature Regulation During Exercise and the Individual Differences." SHS Web of Conferences 174 (2023): 03013. http://dx.doi.org/10.1051/shsconf/202317403013.

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Humans are homeotherms and can only maintain a limited range of body temperatures under hypothermic or hyperthermic conditions. During exercise, the body requires significant energy supplied by ATP within the cells. However, not all the energy provided by ATP is used in muscle contraction as “useful” energy and a substantial amount is converted into heat energy. As a result, during strenuous exercise, the body generates a large amount of heat energy, raising body temperature significantly. Intense exercise can generate over 1000 watts of heat, increasing the body’s core temperature by a few de

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