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Littérature scientifique sur le sujet « Overall heat transfer coefficient »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 26 juillet 2025

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Articles de revues sur le sujet "Overall heat transfer coefficient"

Ozturk, Ali. "Overall Heat Transfer Coefficient of Functionally Graded Hollow Cylinder." Solid State Phenomena 267 (October 2017): 177–81. http://dx.doi.org/10.4028/www.scientific.net/ssp.267.177.

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This paper presents how to calculate the overall heat transfer coefficient of a very long functionally graded hollow circular cylinder subjected to steady state heat transfer. Thermal conductivity coefficient of the functionally graded cylinder (FGC) vary radially and continuously according to an exponential form, which is supposed to be independent of the temperature. Overall heat transfer coefficient is found analytically in terms of the radial coordinate, thermal conductivity, material parameter, inner surface and outer surface temperatures of the cylinder. Once the overall heat transfer co

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Taslim, M. E., and V. Nezym. "A New Statistical-Based Correlation for the Rib Fin Effects on the Overall Heat Transfer Coefficient in a Rib-Roughened Cooling Channel." International Journal of Rotating Machinery 2007 (2007): 1–11. http://dx.doi.org/10.1155/2007/68684.

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Heat transfer coefficients in the cooling cavities of turbine airfoils are greatly enhanced by the presence of discrete ribs on the cavity walls. These ribs introduce two heat transfer enhancing features: a significant increase in heat transfer coefficient by promoting turbulence and mixing, and an increase in heat transfer area. Considerable amount of data are reported in open literature for the heat transfer coefficients both on the rib surface and on the floor area between the ribs. Many airfoil cooling design software tools, however, require an overall average heat transfer coefficient on

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Ohashi, Yuta, Ryota Tsuchiya, Masahisa Ishii, and Makio Hayashi. "Greenhouse Covering Material Overall Heat-transfer Coefficient Determination Using Contour Plots." HortScience 60, no. 2 (2025): 235–36. https://doi.org/10.21273/hortsci18217-24.

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Improving greenhouse heat-insulating performance requires covering materials with low overall heat-transfer coefficients. We constructed a contour plot using equations relating this coefficient to longwave radiation absorptance under different outdoor downward longwave radiation levels. It revealed that the coefficient ranged from 4.7 to 7.7 W·m−2·K−1, decreasing with increasing downward longwave radiation and longwave radiation absorptance. This method facilitates rapid estimation of overall heat-transfer coefficients under different downward longwave-radiation levels, based on longwave-radia

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Korprasertsak, Nataporn, and Thananchai Leephakpreeda. "Real-Time Determination of Overall Heat Transfer Coefficient from the Seebeck Effect by Using Adaptive Learning-Rate Optimization." E3S Web of Conferences 162 (2020): 01002. http://dx.doi.org/10.1051/e3sconf/202016201002.

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It is challenging to determine the actual overall heat transfer coefficient under thermal conditions during processes. In a conventional approach, they are obtained as a constant with the empirical formula for the given conditions. In this study, the Adaptive moment estimation (Adam) technique is investigated for adaptive learning-rate optimization in the real-time determination of the overall heat transfer coefficient via the Seebeck effect in the thermoelectric modules. Two thermoelectric modules detect heat transfer as solid surfaces exposed to the outdoor air. The principle of energy balan

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IORDACHE, Florin, and Florin Băltărețu. "About the overall heat transfer coefficient of plate heat exchangers." Revista Romana de Inginerie Civila/Romanian Journal of Civil Engineering 16, no. 2 (2025): 216–24. https://doi.org/10.37789/rjce.2025.16.2.10.

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Li, Haowei, Guowei Lin, Qing Xu, Xiaojia Fang, and Shengxian Xian. "Overall Heat Transfer Coefficient Evaluation Method for Uncracked Hydrocarbon Fuel in a Regeneratively-Cooled Heat Exchanger of a Scramjet." Applied Sciences 12, no. 13 (2022): 6590. http://dx.doi.org/10.3390/app12136590.

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Regenerative cooling is critical for the thermal protection of hypersonic propulsion systems, wherein the flow and heat transfer characteristics of the hydrocarbon fuel in the cooling channel are crucial. Restricted by measurement, the distribution of the fuel temperature inside the cooling channel cannot be directly detected. As a result, the measurement of the convective heat transfer coefficient is more an overall heat transfer coefficient. Furthermore, the existing overall heat transfer coefficient calculation method is derived without considering the flow state of the hydrocarbon fuel in

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Radulescu, Sinziana, Loredana Irena Negoita, and Ion Onutu. "Effective Overall Heat Transfer Coefficient Solver in a Triple Concentric-Tube Heat Exchanger." Revista de Chimie 70, no. 6 (2019): 2040–43. http://dx.doi.org/10.37358/rc.19.6.7271.

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A relation for calculation of the effective overall heat transfer coefficient in a triple concentric-tube heat exchanger is proposed. The relation of the effective overall heat transfer coefficient is obtained based on total thermal resistance and it is applied within a case study for thermal analysis of two triple concentric-tube heat exchangers with different geometries, hot fluids and operating conditions. Through case study it is found that the values of effective overall heat transfer coefficient can be obtained with acceptable errors, up to 3 % for both heat exchangers.

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Askarov, Dilmurod Bakhtiyor ugli. "FUNDAMENTALS OF DESIGN AND CALCULATION OF HEAT EXCHANGERS." Research Focus International Scientific Journal 2, no. 12 (2023): 154–58. https://doi.org/10.5281/zenodo.15043852.

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FUNDAMENTALS OF DESIGN AND CALCULATION OF HEAT EXCHANGERS Askarov Dilmurod Bakhtiyor ugli basic doctoral student, Namangan Institute of Engineering and Technology https://doi.org/10.5281/zenodo.15043852 Abstract: Heat exchangers play a crucial role in various industrial applications by facilitating efficient heat transfer between two or more fluids. This paper presents the fundamental principles of heat exchanger design and calculation, focusing on hydrodynamic parameters, heat transfer coefficients, and overall thermal effici

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Shadabkhan, A. Pathan, and Yadav Sanjay. "Computational Fluid Dynamics Analysis on Performance of Heat Transfer in Shell and Tube Heat Exchanger using Nano Fluids." Research and Applications of Thermal Engineering 6, no. 1 (2023): 1–4. https://doi.org/10.5281/zenodo.7638528.

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The simulations are carried out numerically to find out the effects like coefficient of heat transfer and pressure drop by using CFD. The heat transfer coefficient, pressure drop, overall heat transfer coefficient and performance factors are obtained. The CFD results of heat transfer coefficient, pressure drop and overall heat transfer coefficient are observed and compared with the experimental results. The transfer of heat to fluids and from fluids is vital between the basic operations in the industries. Heat exchangers enable efficient heat transfer between two mediums. In this way the t

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Popescu, Mirela, Tibor Bedo, and Bela Varga. "Determination of Overall Heat Transfer Coefficient by Simple Thermal Analyze." Scientific Bulletin of Valahia University - Materials and Mechanics 14, no. 11 (2016): 11–16. http://dx.doi.org/10.1515/bsmm-2016-0002.

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Abstract To know more precise the value of overall heat transfer coefficient is on a special importance to programs (software) that models the solidification process for project casting technology in order to optimize them by dimensioning and appropriate placement both the gating system and the risers for eliminate casting defects, shrinkages. The paper aims to determin the value of overall heat transfer coefficient on the cooling curve recorded in casting-solidification real conditions. The values obtained for the overall heat transfer coefficient (2.34 to 25.41) · 10−4 [cal/s.grad.cm2]) for

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Thèses sur le sujet "Overall heat transfer coefficient"

Batmaz, Ediz. "Overall Heat Transfer Coefficients and Axial Temperature Distribution of Fluids in a Triple Tube Heat Exchanger." NCSU, 2003. http://www.lib.ncsu.edu/theses/available/etd-11062003-123823/.

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Computation of overall heat transfer coefficients in a triple tube heat exchanger (TTHE) is complicated when compared to a double tube heat exchanger (DTHE) since the two overall heat transfer coefficients are not independent of each other and must be solved for simultaneously. Previous methods established towards calculation of these parameters either include assumptions that are not valid for all flow conditions and fluid flow rates or use empirical correlations which may cause significant deviations from actual values of these parameters. A more generic technique was developed for calculati

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Шамчук, Борис Леонідович, та Borys Shamruk. "Модернізація кожухотрубної теплообмінної установки марки 800ТНГ-2,5-М1 для нагрівання молока із дослідженням коефіцієнту теплопередачі". Master's thesis, ТНТУ, 2020. http://elartu.tntu.edu.ua/handle/lib/33870.

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Захист відбувся 22 грудня 2020р. о 13.00 годині на засіданні екзаменаційної комісії №18 Робота присвячена підвищенню інтенсифікації теплообміну в кожухотрубному теплообміннику. Досліджено процес теплообміну в кожухотрубному теплообміннику, зокрема досліджено вплив статичних спіральних вставок на значення коефіцієнта теплопередачі. Запропоновано заходи для підвищення коефіцієнта теплопередачі Вступ 1. 1. Оглядова частина. 1.1. Огляд існуючого теплообмінного обладнання. 1.1.1. Загальні поняття. 1.1.2. Класифікація теплообмінного обладнання. 1.2. Мета та задачі роботи 2. Методи досліджень.

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Wahlberg, Tobias. "Modeling of Heat Transfer." Thesis, Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-12217.

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Modeling of heat transfer using Dymola. In this report a evaporator, economizer and superheater where modeled. The report describes how the models where modeled and what input was most suitable for a accurate model.

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Overturf, Logan Matthew. "STUDY OF EXTENDED LIFE COOLANT WITH SUSPENDED CARBON NANOTUBES." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/689.

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Utilizing an experimental facility which was prepared to conduct performance tests on heat exchangers; experiments were completed in an attempt to see verifiable improvements in overall heat transfer coefficient in engine coolant with nanoparticles suspended at different weight percentages. The different fluids tested were: base ELC (Extended Life Coolant), ELC with 0.002 wt% CNT (Carbon Nanotubes), ELC with 0.02 wt% CNT, ELC with 0.02 wt% MWNT's (Multiwalled Nanotubes) and water. The volume percents range from 0.00164 volume% to 0.0164 volume% which seemed quite small, but according to Caterp

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Sartori, Ana Paola. "Desenvolvimento e caracterização de compósitos sanduíche para isolamento térmico." reponame:Repositório Institucional da UCS, 2009. https://repositorio.ucs.br/handle/11338/453.

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Um painel sanduíche consiste essencialmente em duas faces, podendo inclusive possuir reforços metálicos e um núcleo formado normalmente por um polímero celular. As faces deste tipo de painel podem estar unidas por um adesivo estrutural, ou por espuma rígida de poliuretano (PU) injetado diretamente sobre os substratos, quando a união ocorrerá naturalmente. A propriedade de maior relevância que o painel sanduíche deve ter para o transporte de cargas congeladas (0ºC a -30ºC) ou refrigeradas (7ºC a 1ºC) é a condutividade térmica (k). Dentro deste contexto o objetivo deste trabalho foi propor e car

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Webber, Helen. "Compact heat exchanger heat transfer coefficient enhancement." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540881.

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Macbeth, Tyler James. "Conjugate Heat Transfer and Average Versus Variable Heat Transfer Coefficients." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5801.

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An average heat transfer coefficient, h_bar, is often used to solve heat transfer problems. It should be understood that this is an approximation and may provide inaccurate results, especially when the temperature field is of interest. The proper method to solve heat transfer problems is with a conjugate approach. However, there seems to be a lack of clear explanations of conjugate heat transfer in literature. The objective of this work is to provide a clear explanation of conjugate heat transfer and to determine the discrepancy in the temperature field when the interface boundary condition is

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Hussein, Mohammed Sabah. "Coefficient identification problems in heat transfer." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/12291/.

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The aim of this thesis is to find the numerical solution for various coefficient identification problems in heat transfer and extend the possibility of simultaneous determination of several physical properties. In particular, the problems of coefficient identification in a fixed or moving domain for one and multiple unknowns are investigated. These inverse problems are solved subject to various types of overdetermination conditions such as non-local, heat flux, Cauchy data, mass/energy specification, general integral type overdetermination, time-average condition, time-average of heat flux, St

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Hollis, Peter Graham. "The overall oxygen transfer coefficient and interfacial area in hydrocarbon-based bioprocesses." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96868.

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Thesis (MEng)--Stellenbosch University, 2015. ENGLISH ABSTRACT: Bioconversion of hydrocarbons to value-added intermediates and products has significant industrial potential using both prokaryotic and eukaryotic organisms. In particular, alkanes can be converted to an expansive range of commercially important products using aerobic bioprocesses under mild process conditions. Coupled with the relative abundance of alkanes derived from gas to liquid (GTL) technologies, such as those employed by SASOL, South Africa, the commercial potential for bioconverison of alkanes is large. However, u

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Ammari, H. D. "The heat transfer coefficient on film cooled surfaces." Thesis, University of Nottingham, 1989. http://eprints.nottingham.ac.uk/12730/.

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A systematic investigation of the effects of coolant-to-mainstream density ratio and mainstream acceleration on the heat transfer following injection through a row of holes in a flat plate into a turbulent boundary layer is described. A mass transfer technique was employed which uses a swollen polymer surface and laser holographic interferometry. The constant concentration of the test surface simulated isothermal conditions. Density ratios in excess of unity, representative of gas turbine operating conditions, were obtained using foreign gas injection into mainstream air. The experimental tech

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Livres sur le sujet "Overall heat transfer coefficient"

T, Dickson, U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Systems Technology, and Oak Ridge National Laboratory, eds. Impact of the heat transfer coefficient on pressurized thermal shock. Division of Systems Technology, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1999.

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Al-Ahmadi, Adel Bin Musaed Sulaiman. Electrohydrodynamic (EHD) enhancement of condensation heat transfer - development of correlation for heat transfer coefficient for tubular systems. University of Birmingham, 2003.

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Nazeri, Habib. The measurement of the heat transfer coefficient between cryolite and ledge. National Library of Canada, 1994.

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E, Poinsatte Philip, and United States. National Aeronautics and Space Administration., eds. Transient liquid-crystal technique used to produce high-resolution convective heat-transfer-coefficient maps. National Aeronautics and Space Administration, 1993.

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A, Hippensteele Steven, and Lewis Research Center, eds. High-resolution heat-transfer-coefficient maps applicable to compound-curve surfaces using liquid crystals in a transient wind tunnel. National Aeronautics and Space Administration, Lewis Research Center, 1988.

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Cyril, Masiulaniec K., and United States. National Aeronautics and Space Administration., eds. Experimental technique and assessment for measuring the convective heat transfer coefficient from natural ice accretions. National Aeronautics and Space Administration, 1995.

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Chapitres de livres sur le sujet "Overall heat transfer coefficient"

Herwig, Heinz. "Wärmedurchgangskoeffizient k* (overall heat transfer coefficient U*)." In Wärmeübertragung A-Z. Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-56940-1_72.

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Sidebotham, George. "Lumped Capacity Systems and Overall Heat Transfer Coefficients." In Heat Transfer Modeling. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14514-3_2.

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Roetzel, Wilfried, and Bernhard Spang. "C3 Typical Values of Overall Heat Transfer Coefficients." In VDI Heat Atlas. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-77877-6_6.

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Baffour-Awuah, E., N. Y. S. Sarpong, I. N. Amanor, and E. Bentum. "Determination of Overall Coefficient of Heat Transfer of Building Wall Envelopes." In Sustainable Education and Development – Sustainable Industrialization and Innovation. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25998-2_44.

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Manan, Ain Najwa Abdul, Dzarisofea Anuar, Muhammad Latiff Abd Khalid, Ahmad Kamal Ismail, and Ishak Abdul Azid. "Overall Heat Transfer Coefficient of Different Coolants and Frontal Air Velocity in Automotive Radiators." In Progress in Engineering Technology IV. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93250-3_12.

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Sedaghat, Ahmad, Mohammad Nazififard, and Mohamad Iyad Al-Khiami. "Dynamic IoT Determination of Overall Heat Transfer Coefficient in a Portable Cabin in Kuwait." In IFIP Advances in Information and Communication Technology. Springer Nature Switzerland, 2024. https://doi.org/10.1007/978-3-031-81900-1_17.

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Morali, Ugur. "A Computational Study of the Heat Transfer Coefficient for Lithium-Ion Battery Temperature." In Novel Techniques in Maintenance, Repair, and Overhaul. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-42041-2_4.

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Kallath, Hariharan, Jeong Hoon Heo, Majid Bhinder, Changmin Cao, and El Hassan Ridouane. "Investigation into Condensation for Various Fin Shapes for Condenser Design in a Water-Enhanced Turbofan (WET) Engine." In Lecture Notes in Mobility. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-89444-2_109.

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Abstract The Clean Aviation Sustainable Water-Injecting Turbofan Comprising Hybrid-Electrics (SWITCH) project aims to answer the challenge of climate-neutral Small to Medium Range (SMR) transport by developing a revolutionarily sustainable gas turbine propulsion system and further boosting it with hybridization to improve energy efficiency by 25% and reduce non-CO2 related climate impact by more than 60%. The core of SWITCH is the revolutionary Water-Enhanced Turbofan (WET) concept, which offers unmatched potential to enable climate-neutral aviation based on existing and future infrastructure,

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Shang, De-Yi, and Liang-Cai Zhong. "Skin-Friction Coefficient." In Heat and Mass Transfer. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94403-6_7.

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Roetzel, Wilfried, and Bernhard Spang. "C2 Overall Heat Transfer." In VDI Heat Atlas. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-77877-6_5.

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Actes de conférences sur le sujet "Overall heat transfer coefficient"

Andrews, G. E., A. A. Asere, C. I. Hussain, M. C. Mkpadi, and A. Nazari. "Impingement/Effusion Cooling: Overall Wall Heat Transfer." In ASME 1988 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1988. http://dx.doi.org/10.1115/88-gt-290.

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Experimental results are presented for the overall heat transfer coefficient within an impingement/effusion wall, using a transient cooling technique. This was previously used for determining the effusion hole heat transfer alone. Two impingement/effusion geometries were used with an 8 mm gap and the same impingement wall with an X/D of 11. The separate impingement and effusion short hole heat transfer coefficients were also determined. The impingement/effusion overall heat transfer was 45% and 30% higher than the impingement heat transfer alone for the two test geometries. The greater increas

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Ibrahim, Abdelrahman S., Kanagaswaran Chitalingam, and Mohd Amin Shoushtari. "On overall heat transfer coefficient in EOR injection wellbore." In 2011 National Postgraduate Conference (NPC). IEEE, 2011. http://dx.doi.org/10.1109/natpc.2011.6136534.

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Dabagh, A. M. Ai, and G. E. Andrews. "Pin-Fin Heat Transfer: Contribution of the Wall and the Pin to the Overall Heat Transfer." In ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/92-gt-242.

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The differences in the heat transfer coefficient between the pin and the wall in pin-fin heat transfer was determined for three pin length to diameter ratios. A staggered pin-fin array was used with a 50% duct flow blockage by the pins. The axial pitch-to-pin diameter ratio, X/D, was 1.5 and the transverse pitch-to-diameter ratio, S/D, was 2.0. Three pin length-to-diameter ratios, T/D, of 0.7. 1.0 and 2.2 were investigated. The mean heat transfer coefficient results were very similar to previous work for similar geometries. The axial variation of heat transfer coefficient showed this to be fai

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Lamont, Justin, Sridharan Ramesh, Srinath V. Ekkad, Anil Tolpadi, Christopher Kaminski, and Samir Salamah. "Heat Transfer Enhancement in Narrow Diverging Channels." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68486.

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Detailed heat transfer coefficient distributions have been obtained for narrow diverging channels with and without enhancement features. The cooling configurations considered include rib turbulators and concavities (or dimples) on the main heat transfer surfaces. All the measurements are presented at a representative Reynolds number of 28,000. Pressure drop measurements for the overall channel are also presented to evaluate the heat transfer enhancement geometry with respect to pumping power requirements. The test models were studied for wall heat transfer coefficient measurements using the tr

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Mueller, Donald, and Hosni Abu-Mulaweh. "Overall Heat-Transfer Coefficient for a Fin Cooled by Convection and Radiation." In 45th AIAA Aerospace Sciences Meeting and Exhibit. American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-195.

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Ichim, A. C., and C. Teodoriu. "Reflections on Overall Heat Transfer Coefficient with Application to Thermal Well Design." In SPE Thermal Well Integrity and Design Symposium. Society of Petroleum Engineers, 2016. http://dx.doi.org/10.2118/182531-ms.

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Golob, Matthew, Sheldon Jeter, and Dennis Sadowski. "Heat Transfer Coefficient Between Flat Surface and Sand." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54438.

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Thermal energy storage (TES) systems are of interest in solar thermal power applications as an effective means of retaining energy. One of the primary issues with this type system is the exchange of thermal energy coming off the power field. In a heat exchanger, the effective heat transfer coefficient between the exchange mediums plays a crucial factor in determining the sizing of the heat exchange unit. A concept utilizing sand as a cheap particulate thermal medium was recently proposed for an alternative thermal energy storage system. The overall system will be described in some detail; howe

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Mossi, Anderson C., Vinayak V. Barve, Marcelo M. Galarc¸a, Hora´cio A. Vielmo, Francis H. R. Franc¸a, and Ofodike A. Ezekoye. "Spectral Gas Absorption Coefficient Model Effects on Radiative Source Term in a 2D Axisymmetric Diffusion Flame." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22967.

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A calculation of the radiative source term in combustion processes is an important part of the simulation process, because high temperatures are involved and the coupling of radiation to chemistry affects the overall flame characteristics. While relatively simple gas absorption coefficient models have been used in the recent past, it is becoming clearer that more accurate gas models alter the distribution of radiative sources in the flame. To accurately evaluate the radiative losses, it is necessary to use gas models in which the gas absorption coefficient is wavelength dependent. Such analyse

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Scott, Timothy C. "Modeling Compact Exchangers for HVAC Applications." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47052.

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This paper presents equations for modeling the performance of compact air cooled heat exchangers when only limited supplier catalog performance information is available. Relations for the overall heat transfer coefficient under dry or wet surface operating conditions with water, steam, and refrigerants are presented. Equations for the air and water side pressure drop are also given. The coefficients in these equations may be determined using typical heat transfer vs. air face velocity data without the need for various surface and flow areas or air side convection coefficients. The model may th

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Helmns, Andrea, and Van P. Carey. "Modeling of Intramatrix Heat Transfer in Thermal Energy Storage for Asynchronous Cooling." In ASME 2017 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ht2017-4870.

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In this paper, we investigate sensible and latent heat transfer through heat exchanger matrix structures containing phase change material (PCM) in the interstitial spacing. The heat transfer is driven by a temperature difference between fluid flow passages and the phase change material matrix which experiences sensible heat transfer until it reaches the phase change material fusion point; then it undergoes melting or solidification in order to store, or reject, energy. In prior work, a dimensionless framework was established to model heat transfer in a thermal energy storage (TES) device much

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Rapports d'organisations sur le sujet "Overall heat transfer coefficient"

Leslie, P., R. Wood, F. Sigler, A. Shapiro, and A. Rendon. Heat transfer coefficient in serpentine coolant passage for CCDTL. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/345040.

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Donovan, William F. Determination of Heat Transfer Coefficient in a Gun Barrel from Experimental Data. Defense Technical Information Center, 1985. http://dx.doi.org/10.21236/ada151815.

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Hansen, Peter J., and Amir Arav. Embryo transfer as a tool for improving fertility of heat-stressed dairy cattle. United States Department of Agriculture, 2007. http://dx.doi.org/10.32747/2007.7587730.bard.

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The overall objective of the current proposal is to develop procedures to improve the pregnancy rate achieved following transfer of fresh or cryopreserved embryos produced in the laboratory into heat-stress recipients. The overall hypothesis is that pregnancy rate in heat-stressed lactating cows can be improved by use of embryo transfer and that additional gains in pregnancy rate can be achieved through development of procedures to cryopreserve embryos, select embryos most likely to establish and maintain pregnancy after transfer, and to enhance embryo competence for post-transfer survival thr

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Kedzierski, Mark A., and Donggyu Kang. Horizontal convective boiling of R1234yf, R134a, and R450A within a micro-fin tube :. National Institute of Standards and Technology (U.S.), 2017. http://dx.doi.org/10.6028/nist.tn.1966.

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This report presents local convective boiling heat transfer and Fanning friction factor measurements in a micro-fin tube for R134a and two possible low global warming potential (GWP) refrigerant replacements for R134a: R1234yf and R450A. Test section heating was achieved with water in either counterflow or in parallel flow with the test refrigerant to provide for a range of heat fluxes for each thermodynamic quality. An existing correlation from the literature for single and multi-component mixtures was shown to not satisfactorily predict the convective boiling measurements for flow qualities

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Salonvaara, Mikael, and André Desjarlais. The impact of the solar absorption coefficient of roof and wall surfaces on energy use and peak demand. Department of the Built Environment, 2023. http://dx.doi.org/10.54337/aau541650886.

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Climate change, electrification to decarbonize the building sector, and the rise of renewable energy sources have made reducing the peak demand even more important than solely reducing the overall energy use. Solar radiation can have a significant impact on the energy use of buildings. However, previous studies on solar absorption in building envelopes have focused on cool roofs. Less effort has been made to evaluate the impact of solar radiation on heat loss and gain on walls. This paper summarizes a preliminary study to estimate the magnitude of the benefit low solar absorptance surfaces hav

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DiDomizio, Matthew, and Jonathan Butta. Measurement of Heat Transfer and Fire Damage Patterns on Walls for Fire Model Validation. UL Research Institutes, 2024. http://dx.doi.org/10.54206/102376/hnkr9109.

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Fire models are presently employed by fire investigators to make predictions of fire dynamics within structures. Predictions include the evolution of gas temperatures and velocities, smoke movement, fire growth and spread, and thermal exposures to surrounding objects, such as walls. Heat flux varies spatially over exposed walls based on the complex thermal interactions within the fire environment, and is the driving factor for thermally induced fire damage. A fire model predicts the temperature and heat transfer through walls based on field predictions, such as radiative and convective heat fl

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Howard, Isaac, Thomas Allard, Ashley Carey, Matthew Priddy, Alta Knizley, and Jameson Shannon. Development of CORPS-STIF 1.0 with application to ultra-high performance concrete (UHPC). Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/40440.

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This report introduces the first release of CORPS-STIF (Concrete Observations Repository and Predictive Software – Structural and Thermodynamical Integrated Framework). CORPS-STIF is envisioned to be used as a tool to optimize material constituents and geometries of mass concrete placements specifically for ultra-high performance concretes (UHPCs). An observations repository (OR) containing results of 649 mechanical property tests and 10 thermodynamical tests were recorded to be used as inputs for current and future releases. A thermodynamical integrated framework (TIF) was developed where the

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Hansen, Peter J., and Zvi Roth. Use of Oocyte and Embryo Survival Factors to Enhance Fertility of Heat-stressed Dairy Cattle. United States Department of Agriculture, 2011. http://dx.doi.org/10.32747/2011.7697105.bard.

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The overall goal was to identify survival factors that can improve pregnancy success following insemination or embryo transfer in lactating dairy cows exposed to heat stress. First, we demonstrated that oocytes are actually damaged by elevated temperature in the summer. Then we tested two thermoprotective molecules for their effect on oocyte damage caused by heat shock. One molecule, ceramide was not thermoprptective. Another, insulin-like growth factor-1 (IGF) reduced the effects of heat shock on oocyte apoptosis and oocyte cleavage when added during maturation. We also used lactating cows ex

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Glazer, Itamar, Randy Gaugler, Daniel Segal, Parwinder Grewal, Yitzhak Spiegel, and Senthamizh Selvan. Genetic Enhancement of Environmental Stability and Efficacy of Entomopathogenic Nematodes for Biological Control. United States Department of Agriculture, 1995. http://dx.doi.org/10.32747/1995.7695833.bard.

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The overall obejctive of the research project was to enhance the intrinsic biological control potential of entomopathogenic nematodes through genetic manipulation. We have chosen heat and desiccation tolerance as prime traits to be enhanced in order to increase the overall efficacy of these nematodes against insect pests under harsh conditions. Initially, we used mutagenesis and selection approaches to enhance these traits. In the mutagenesis experiments several morphological mutants of Heterorhabditis bacteriophora HP88 were isolated and characterized phenotypically and genetically. Infective

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Chejne, Farid, Valentina Sierra-Jiménez, Marlon Córdoba, María del Pilar Noriega, and Manuel García-Pérez. Biochar Production, and Use: A Detailed Review of the Art. Universidad de los Andes, 2024. https://doi.org/10.51573/andes.pps39.ss.bbb.2.

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This study presents a detailed description of the technologies and processes for obtaining biochar and its formation from the fundamental structures of aromatic groups. These aromatic groups come from biomass pyrolysis; therefore, this document explores the complex relationship between biochar structural characteristics and the reactions involved in its formation during the pyrolysis process, specifically: analysis of the generation of a cross-linked network, structural features, and the impact of free radicals on biochar formation. This study will culminate with an analysis of microwave absor

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