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Dissertations / Theses on the topic 'Vapor compression refrigeration system'

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Published: 3 June 2025

Last updated: 31 July 2025

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1

Roberti, Giovanni. "Steady-state Modelling of a Vapor Compression Refrigeration Cycle." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19438/.

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In this work a steady-state model of a simple vapor compression refrigeration cycle is presented. All the fundamental components of this system are modeled separately in order to consider them as black boxes that take inputs and convert them into output variables. The heat exchangers are treated as a set of multiple zones, identified by the refrigerant's state, connected in series, in which the heat transfer coefficient (HTC) is constant. A non-linear system of equations is obtained applying the energy balances and the ε-NTU method for each zone in the heat exchangers. A study on the HTC corre

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2

MARTINEZ, LUIS CARLOS CASTILLO. "OPTIMIZATION THE CIRCUITING REFRIGERATION OF THE HEAT EXCHANGERS IN VAPOR COMPRESSION REFRIGERATION SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=31763@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Em sistemas de refrigeração por compressão de vapor, o projeto adequado dos circuitos para o refrigerante nos trocadores de calor pode ter um impacto significativo no seu coeficiente de performance (COP). O projeto otimizado dos circuitos de refrigerante em sistemas de refrigeração com trocadores de calor do tipo tubo-aletado não é trivial, devido à complexidade de sua represent

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3

Miller, Eric S. "Dynamic Modeling of Vapor Compression Cycle Systems." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1337715881.

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4

Schoenfeld, Jonathan Michael. "Integration of a thermoelectric subcooler into a carbon dioxide transcritical vapor compression cycle refrigeration system." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8726.

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Thesis (M.S.) -- University of Maryland, College Park, 2008.<br>Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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5

Zhang, Quansheng. "Modeling, Energy Optimization and Control of Vapor Compression Refrigeration Systems for Automotive Applications." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406121484.

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6

SZCZERB, IGOR. "NUMERICAL SIMULATION OF A VAPOR-COMPRESSION REFRIGERATION SYSTEM USING A MIXTURE OF R134A REFRIGERANT AND NANOLUBRICANT POE/TIO2." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35844@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>O presente trabalho apresenta um modelo de simulação numérica para um sistema de refrigeração por compressão de vapor, operando com uma mistura de fluido refrigerante (R134a) e nanolubrificante, composto por óleo poliol éster (POE) como fluido base contendo nanopartículas de TiO2 em suspensão. Para o estudo dos trocadores de calor, foi utilizado o método de análise local, onde o condensador e o evaporador foram divididos em volumes de control

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7

Richardson, David Hallam. "An object oriented simulation framework for steady-state analysis of vapor compression refrigeration systems and components." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3753.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.<br>Thesis research directed by: Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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8

Harraghy, P. G. "An assessment of refrigeration system performance with a particular emphasis on the effects of frosting and defrosting." Thesis, University of Liverpool, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234842.

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9

ALBUQUERQUE, Carlos Eduardo da Silva. "Avaliação do comportamento energético e exergético de um sistema de refrigeração por compressão de vapor." Universidade Federal de Campina Grande, 2017. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1249.

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Submitted by Emanuel Varela Cardoso (emanuel.varela@ufcg.edu.br) on 2018-07-25T23:39:27Z No. of bitstreams: 1 CARLOS EDUARDO DA SILVA ALBUQUERQUE – DISSERTAÇÃO (PPGEM) 2017.pdf: 4080439 bytes, checksum: 940fff54d861725d16972dec4bb0ee8c (MD5)<br>Made available in DSpace on 2018-07-25T23:39:27Z (GMT). No. of bitstreams: 1 CARLOS EDUARDO DA SILVA ALBUQUERQUE – DISSERTAÇÃO (PPGEM) 2017.pdf: 4080439 bytes, checksum: 940fff54d861725d16972dec4bb0ee8c (MD5) Previous issue date: 2017-03-17<br>CNPq<br>Esta pesquisa apresenta uma análise energética e exergética de uma unidade de refrigeração de águ

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10

Brenner, Lorenz. "Exergy-based performance assessment and optimization potential of refrigeration plants in air-conditioning applications." Thesis, Lyon, 2021. http://www.theses.fr/2021LYSEI014.

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Une grande partie de la consommation d'énergie dans les bâtiments est due aux systèmes de chauffage, de ventilation et de climatisation. Entre autres systèmes, les systèmes de réfrigération font l'objet de mesures d'amélioration de l'efficacité. Néanmoins, les conditions opérationnelles réelles de ces installations et leurs performances doivent être connues, ainsi que tout potentiel d'optimisation éventuel, avant que des améliorations puissent être réalisées. Les analyses exergétique et énergétiques ont été largement utilisées pour évaluer la performance des systèmes de réfrigération. Entre au

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11

Hussen, Muaz Bedru. "STUDY OF A SMALL-SCALE COOLING SYSTEM BASED ON AN ICE-STORAGE AND A DC-POWERED VAPOUR COMPRESSION REFRIGERATION UNIT TO IMPLEMENT SOLAR ENERGY IN REMOTE AREAS." Doctoral thesis, Universitat Rovira i Virgili, 2020. http://hdl.handle.net/10803/670597.

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La refrigeració manté la qualitat sensorial del productes i minimitza la pèrdua en les cadenes de valor del fred. Les àrees remotes dels països en desenvolupament es caracteritzen principalment pels baixos nivells de tecnologia, accés limitat a la xarxa elèctrica i el predomini de les petites explotacions agrícoles com un desafiament. El principal objectiu d'aquesta tesi és desenvolupar i caracteritzar un sistema de refrigeració modular multipropòsit basat en l'emmagatzematge de gel per a aplicacions de petita escala. El sistema d'emmagatzematge de gel va utilitzar un equip de refrigeració am

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12

Cornejo, Ma Elena Rueda. "Fault detection and diagnosis in vapour compression refrigeration systems." Thesis, Brunel University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439801.

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13

Ibrahim, G. A. "An investigation into liquid film absorbers for refrigeration systems." Thesis, King's College London (University of London), 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245436.

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14

Grace, Iain Nicholas. "Modelling the performance and dynamics of vapour compression refrigeration systems." Thesis, Brunel University, 2000. http://bura.brunel.ac.uk/handle/2438/5265.

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The impact of refrigeration systems on the environment can be reduced by the use of alternative reffigerants which are less harmful to the atmosphere and the optimisation of systems and control strategies to deliver increased levels of energy efficiency. Mathematical modelling offers the opportunity to test the performance of systems under different operating conditions and with alternative refrigerants. Dynamic models allow comparison of both transient and steady-state behaviour and this is of particular importance for liquid chillers, since these systems can operate under transient condition

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15

Naghashzadegan, Mohammad. "Steady state and dynamic behaviour of vapour compression refrigeration systems." Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284386.

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16

Coggins, Charles Lee. "Single- and Multiple-Stage Cascaded Vapor Compression Refrigeration for Electronics Cooling." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16283.

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The International Technology Roadmap for Semiconductors (ITRS) predicts that microprocessor power consumption will continue to increase in the foreseeable future. It is also well known that microprocessor performance can be improved by lowering the junction temperature: recent analytical studies show that for a power limited chip, there is a non-linear scaling effect that offers a 4.3x performance enhancement at -100 °C, compared to 85 °C operation. Vapor Compression Refrigeration (VCR) is a sufficiently compact, low cost, and power efficient technology for reducing the junction temperature

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17

Ablanque, Mejía Nicolás. "Numerical simulation and experimental validation of vapor compression refrigerating systems: special emphasis on natural refrigerants." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/77824.

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The aim of this work is to study the thermal and fluid-dynamic behavior of vapor compression refrigerating systems and their constitutive elements (heat exchangers, expansion devices, compressors and connecting tubes) focused on the use of natural refrigerants (carbon dioxide, isobutane and ammonia). The specific topics analyzed throughout this thesis have arisen from the growing interest in environmentally friendly refrigerants that has led the CTTC group (Centro Tecnológico de Transferencia de Calor) to undertake significant research efforts and to take part in several projects with national

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18

Yildiz, Seyfettin. "Design And Simulation Of A Vapor Compression Refrigeration Cycle For A Micro Refrigerator." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612133/index.pdf.

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Cooling of electronic equipments has become an important issue as the advances in technology enabled the fabrication of very small devices. The main challenge in cooling is the space limitation. The use of miniature refrigerators seems to be a solution alternative for the cooling problem. The objective of this study is to design and simulate a vapor compression refrigeration cycle for a micro-scale refrigerator. A MATLAB code is developed for the simulations. The four components of the refrigerator, namely, the condenser, evaporator, compressor and the capillary tube are designed separately. T

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19

Lara, Ruiz Jorge Horacio Juan. "An advanced vapor-compression desalination system." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3340.

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Currently, the two dominant desalination methods are reverse osmosis (RO) and multi-stage flash (MSF). RO requires large capital investment and maintenance, whereas MSF is too energy intensive. An innovative vapor-compression desalination system is developed in this study. A comprehensive mathematical model for the heat exchanger/evaporator is described. The literature indicates that extraordinarily high overall heat transfer coefficients for the evaporator are possible at selected operating conditions that employ dropwise condensation in the steam side and pool boiling in the liquid side. A s

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20

Rigola, Serrano Joaquim. "Numerical simulation and experimental validation of hermetic reciprocating compressors. Integration in vapour compression refrigerating systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2002. http://hdl.handle.net/10803/6684.

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The numerical simulation model presented is based on the integration of the fluid conservation equations (continuity, momentum and energy) in the whole compressor domain (compression chamber, valves, manifolds, mufflers, connecting tubes, parallel paths, etc.) using instantaneous local mean values for the different variables. It is interesting to remark how momentum equation has been taken into account in all compressor parts and the possibility to solve parallel paths, resonators, etc. Effective flow areas are evaluated considering multidimensional models based on modal analysis of fluid int

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21

Brandão, Matheus Marcelino. "Modelagem numerica de sistemas de refrigeração por compressão de vapor." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263358.

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Orientador: Luiz Felipe Mendes de Moura<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-12T21:08:34Z (GMT). No. of bitstreams: 1 Brandao_MatheusMarcelino_M.pdf: 452664 bytes, checksum: 124f6ab109716c77cffe6f192c006b30 (MD5) Previous issue date: 2005<br>Resumo: No presente trabalho se realiza o estudo e desenvolvimento de um modelo numérico computacional com a finalidade da simulação de sistemas de refrigeração por compressão de vapor. Em um primeiro momento, foram analisados e discutidos os principais tipo

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22

Sadurní, Caballol Alexandre. "Numerical analysis and experimental studies of vapour compression refrigerating systems: special emphasis on different cycle configurations." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/96980.

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The aim of this work is to study the thermal behavior and fluid-dynamic systems, vapor compression refrigeration and its components (heat exchangers, expansion devices, compressors, connecting pipes, pumps and pressure vessels). Topics discussed throughout this thesis arise from the growing interest in refrigerants friendly environment as well as different types of cooling systems for vapor compression has motivated the research group of the CTTC (Centre for Heat Transfer Technology ) to carry out major research efforts as well as participate in several projects with national and European inst

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23

Chen, Jianyong. "Investigation of Vapor Ejectors in Heat Driven Ejector Refrigeration Systems." Doctoral thesis, KTH, Tillämpad termodynamik och kylteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156070.

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Refrigeration systems, air-conditioning units and heat pumps have been recognized as indispensable machines in human life, and are used for e.g. food storage, provision of thermal comfort. These machines are dominated by the vapor compression refrigeration system and consume a large percentage of world-wide electricity output. Moreover, CO2 emissions related to the heating and cooling processes contribute significantly to the total amount of CO2 emission from energy use. The ejector refrigeration system (ERS) has been considered as a quite interesting system that can be driven by sustainable a

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24

Mota, Babiloni Adrián. "ANALYSIS OF LOW GLOBAL WARMING POTENTIAL FLUORIDE WORKING FLUIDS IN VAPOUR COMPRESSION SYSTEMS. EXPERIMENTAL EVALUATION OF COMMERCIAL REFRIGERATION ALTERNATIVES." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/62680.

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[EN] Climate change is one of the short term threats for the humanity because it can affect seriously to the environment and, consequently, to vegetal and animal life. If it is not stopped in next years, maybe this effect will be irreversible. Climate change is produced by anthropogenic emissions of Greenhouse Gas to Earth's atmosphere. Vapour compression systems are one of the main contributors to this phenomenon. Among them, commercial refrigeration applications, through HFC usage, can be highlighted. Since 1990s, developed countries supermarkets are using refrigerants (mainly R134a, R404A a

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Carvalho, Paulo Sérgio Germano. "Estudo aplicado de ACV a sistema de refrigeração por absorção e por compressão de vapor de amônia." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3150/tde-19012011-160051/.

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A presente se tese desenvolve uma metodologia para comparar as substâncias emitidas na construção e operação de sistema frigorífico por absorção e por compressão de vapor de amônia usando a metodologia denominada Análise do Ciclo de Vida (ACV). Pesquisas bibliográficas feitas pelo autor desse trabalho permitem a conclusão de haver poucas informações que permitam a elaboração de um inventário de ciclo de vida para ciclo frigorífico por absorção e por compressão de vapor tendo como fluido de trabalho a amônia. Realizado todo o dimensionamento termodinâmico e mecânico dos ciclos e aplicada a meto

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Danov, Stoyan Viktorov. "Development of experimental and numerical infrastructures for the study of compact heat exchangers and liquid overfeed refrigeration systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2005. http://hdl.handle.net/10803/6688.

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Se ha desarrollado y construido una infraestructura experimental orientada a la validación de modelos de intercambiadores compactos de aletas y tubos y sistemas de refrigeración con sobrealimentación de líquido. El objetivo ha sido la obtención de datos experimentales fiables, con condiciones geométricas y de contorno exactamente definidas, para poder compararlos inequívocamente con resultados de simulaciones numéricas. <br/><br/>Se presentan los modelos matemáticos, objetivo de la validación, y una descripción detallada del circuito de aire, del refrigerante líquido, y del refrigerante de ca

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27

Gustavsson, Andreas. "Dynamic modeling and Model Predictive Control of a vapor compression system." Thesis, Linköpings universitet, Reglerteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-76352.

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The focus of this thesis was on the development of a dynamic modeling capability for a vapor compression system along with the implementation of advanced multivariable control techniques on the resulting model. Individual component models for a typical vapor compression system were developed based on most recent and acknowledged publications within the field of thermodynamics. Parameter properties such as pressure, temperature, enthalpy etc. for each component were connected to detailed thermodynamic tables by algorithms programmed in MATLAB, thus creating a fully dynamic environment. The sepa

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Wadell, Robert Paul. "Experimental Investigation of Compact Evaporators for Ultra Low Temperature Refrigeration of Microprocessors." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7198.

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It is well known that microprocessor performance can be improved by lowering the junction temperature. Two stage cascaded vapor compression refrigeration (VCR) is a mature, inexpensive, and reliable cooling technology that can offer chip temperatures down to ?? C. Recent studies have shown that for a power limited computer chip, there is a non-linear scaling effect that offers a 4.3X performance enhancement at ?? C. The heat transfer performance of a compact evaporator is often the bottleneck in sub-ambient heat removal. For this reason, the design of a deep sub-ambient compact evaporator is c

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Silva, Gerson Barbosa da. "Análise exergo-econômica da microgeração com o uso de motores de combustão interna a biodiesel no acionamento do compressor do sistema por compressão de vapor." Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/8990.

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Submitted by Viviane Lima da Cunha (viviane@biblioteca.ufpb.br) on 2017-06-09T13:24:22Z No. of bitstreams: 1 arquivototal.pdf: 4250994 bytes, checksum: dcfe9035b92d4c47642b67812e3d7ba3 (MD5)<br>Made available in DSpace on 2017-06-09T13:24:22Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 4250994 bytes, checksum: dcfe9035b92d4c47642b67812e3d7ba3 (MD5) Previous issue date: 2016-05-02<br>This wort, its preset the theoretical and experimental study of a vapor compression system (SRCV), with cooling capacity of 26kW (7.5TR) developed at the Recogás at the Federal University of Paraíba. At first i

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Glos, Jan. "Modelování a řízení toků elektrické a tepelné energie v plně elektrických automobilech." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-433039.

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Systematické řízení tepelných a elektrických toků v plně elektrických automobilech se stává velmi důležitým, protože v těchto typech automobilů není k dispozici dostatek odpadního tepla pro vytápění kabiny. Aby v zimním období nedocházelo ke snížení dojezdu, je nutné použití technologií, které umožní snížení spotřeby energie nutné k vytápění kabiny (např. tepelné čerpadlo, zásobník tepla). Je také zapotřebí vytvořit řídicí algoritmy pro tato zařízení, aby byl zajištěn jejich optimální provoz. V letním období je nezbytné řídit tepelné toky v rámci elektromobilu tak, aby nedocházelo k nadměrnému

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Caglar, Ahmet. "Theoretical And Experimental Performance Analysis Of A Solar Assisted Heat Pump." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607898/index.pdf.

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In this thesis, performance of a heat pump aided by solar heating system with an evacuated tubular collector has been analyzed theoretically and experimentally. For this purpose, a domestic hot water heating system has been designed, constructed and tested. The evacuated tubular solar collector has been used to achieve higher collector efficiency in winter. The fraction of the solar energy utilized has been measured experimentally and estimated theoretically. Effects of various parameters have been investigated on the performance of the proposed system. A mathematical model was developed to

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Довгопол, М. В. "Дослідження і розрахунок аміачного поршневого компресора, що працює у складі одноступеневої холодильної машини". Master's thesis, Сумський державний університет, 2020. https://essuir.sumdu.edu.ua/handle/123456789/82900.

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У роботі виконано розрахунок холодильного циклу та компресора, а також визначено вплив температур гарячого і холодного джерела оберненого циклу одноступеневої парокомпресійної холодильної машини на коефіцієнт перетворення циклу, а також на витратні і енергетичні характеристики компресора, що працює у його складі. У розділі охорони праці розглянуто шкідливі та небезпечні фактори, які виникають при експлуатації поршневих компресорів у холодильному виробництві<br>В работе выполнен расчет холодильного цикла и компрессора, а также определено влияние температур горячего и холодного источника обратно

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Kasal, Milan. "Výpočet tepelné zátěže vlakové klimatizační jednotky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378501.

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The subject of this diploma thesis is to apply the knowledge of thermodynamics when designing parameters of the train air conditioning unit. In the first part, the issue of air conditioning technology, basic types of cooling circuits and description of individual components are outlined. Furthermore, there is an overview of groups of refrigerants and their labelling. In the second part, a calculation of the heat load of the train unit for the limit design conditions of summer and winter operation, including the application of humid air theory are to be found. There is a basic procedure for des

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Ara, Paulo José Schiavon. "Desempenho de sistemas de condicionamento de ar com utilização de energia solar em edifícios de escritórios." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3146/tde-01032011-135653/.

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A preocupação energética tem impulsionado a humanidade a buscar alternativas sustentáveis de energia. Neste contexto, os edifícios de escritórios têm um papel importante, em especial, devido ao elevado consumo de energia dos sistemas de condicionamento de ar. Para esses sistemas, a possibilidade de utilização de energia solar é uma alternativa tecnicamente possível e interessante de ser considerada, principalmente porque, quando a carga térmica do edifício é mais elevada, a radiação solar também é mais elevada. Dentre os sistemas de condicionamento de ar solar, o sistema térmico - que associa

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Грицан, М. Ю. "Аналіз можливості створення системи охолодження у технології виробництва молока на базі струминної термокомпресії". Master's thesis, Сумський державний університет, 2020. https://essuir.sumdu.edu.ua/handle/123456789/82208.

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У роботі досліджено можливість створення вакуумної системи охолодження в установці виробництва молока на базі струминної термокомпресії. Розглянуто базову схему на базі пароструминного ежектора та пропоновану схему на базі рідинно-парового ежектора, що працює за принципом струминної термокомпресії. Виконано розрахунок термічних та геометричних параметрів рідинно-парового ежектора та розрахунок і підбір допоміжного обладнання вакуумного агрегату. Виконано ексергетичний аналіз базової та пропонованої схем. У розділі охорони праці розглянуто шкідливі та небезпечні фактори холодильного вир

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Лазуренко, О. В. "Моделювання взаємозв’язків конструктивно-геометричних параметрів із експлуатаційними показниками ежекторно-очисної установки". Master's thesis, Сумський державний університет, 2020. https://essuir.sumdu.edu.ua/handle/123456789/82108.

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У роботі досліджено можливість створення вакуумної системи охолодження в установці виробництва молока на базі струминної термокомпресії. Розглянуто базову схему на базі пароструминного ежектора та пропоновану схему на базі рідинно-парового ежектора, що працює за принципом струминної термокомпресії. Виконано розрахунок термічних та геометричних параметрів рідинно-парового ежектора та розрахунок і підбір допоміжного обладнання вакуумного агрегату. Виконано ексергетичний аналіз базової та пропонованої схем. У розділі охорони праці розглянуто шкідливі та небезпечні фактори холодильного вир

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Wu, Meng-Hsun, and 吳孟勳. "Micro-channel Vapor Compression Refrigeration System for Electrical Cooling." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/56102289065074271906.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>96<br>This research apply Micro-channel Evaporator to Vapor Compression Refriger- ation System (VCRS) for electrical Cooling. Steady and transient States experimental investigations are conducted to analysis the thermal properties depends on the design experimental factor.The cooling capacity of the VCRS varied from 250W to 400W, with COP from 1.7 to 3, at pressure ratios of 1.6 to 2.8.The highest overall second-law efficiency was 70%. In steady state experiment. Micro-channel evaporator efficiently make the heat exchange between CPU base and the evaporator, impr

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Li, Yi-Ting, and 李懿庭. "Investigation of Miniature Vapor Compression Refrigeration System for Electronic Cooling." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/50203717919372546318.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>97<br>Vapor compression refrigeration system (VCRS) is a cooling system that has high COP and high cooling capacity. The research emphasizes on the characteristics of a miniature VCRS and how the experimental factors affect it. This research can be divided into two parts: steady state experiments and VCRS simulations. In steady state experiments, a VCRS has been designed and assembled. The whole system is about 6 kg weight, and the size of the system is about 160×350×150 mm3. Experimental investigations are conducted to analyze that how the orifice of the expans

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"Design and experimental study on miniature vapor compression refrigeration systems." 2012. http://library.cuhk.edu.hk/record=b5549443.

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近年來微型製冷系統有許多應用。例如，電子器件的冷却是研製更快速、更小型和更可靠的芯片的重要課題, 隨著電子芯片功耗的增加，散熱量不断增長，傳統的被動式散熱方法已經過時，新的主動式散熱方法成爲必須。又例如微型個人冷卻系統可用於救火等各種惡劣環境。与其它製冷方法相比，蒸氣壓縮製冷技術是最有潜力的方法。<br>本文闡述了两种微型蒸氣壓縮製冷系統的研製工作：一是電子冷却系统，一是個人热舒适系统。研究主要包括以下幾個方面：<br>1) 微型蒸氣壓縮製冷系統的熱力學分析。對系統在不同工作條件下（包括壓縮機效率、環境溫度等）的性能進行了分析。对換熱器的設計也作了详述。<br>2) 微型蒸氣壓縮製冷系統的熵分析。通過分析發現，壓縮機和系統漏熱造成的熵是產生系統不可逆性的主要因素,因此高效的壓縮機和降低系統漏熱是提高微型蒸氣壓縮製冷系統性能的關鍵所在。<br>3) 實驗系统的詳細介紹。一共做了两套微型蒸氣壓縮製冷系統，一为電子冷卻系統和一为個人冷卻系統。爲了縮小微型蒸氣壓縮製冷系統的尺寸，系統的元件必須小型化。系統的壓縮機是在市場上直接购買的，但是換熱器包括冷板蒸發器、管翅式蒸發器和微通道冷凝器都是特別設計和製造的。實驗裝置建成可以方便的改變工作條件，諸如壓縮機轉速、製冷劑充灌量、毛細管長度、換熱器面積等。<br>4) 對電子冷卻系統和個人冷卻系統分別進行了實驗。對於電子散熱系統來，當發熱管的功率為

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Teng, Tun-Ping, and 鄧敦平. "Research on Improving Performance of Refrigeration by Mechanical-Subcooling Vapor-Compression System." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/51998202762618399694.

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碩士<br>國立臺灣師範大學<br>工業教育研究所<br>89<br>Abstract This subject is the study of the relationship between subcooling of liquid refrigerant and promotion of performance of refrigerator. For this purpose, the effects of subcooling temperature on the parameters of the system were discussed firstly in this subject, and then the effects on parameters and consumption of electric power were analyzed. Furthermore, an operational model was proposed to solve the problem of energy consuming according to the result of the analysis. The mainly discoveries and conclusions in this context a

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林弘仁. "Performance Analysis of Inter-Stage Pressure Applied in a Vapor-Compression Refrigeration System." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/gsx52f.

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碩士<br>國立勤益技術學院<br>冷凍空調系<br>94<br>Over years, the domestic consumption of frozen food has been increasing as the living standard is getting higher and the lifestyle keeps changing. Taiwan, located in sub-tropical area with hot and humid climate, however,has to depend on frozen freezing techniques such as low-temperature logistics, food processing, storage and deep-freezing to maintain the quality and cleanness of frozen food. In industry, these techniques may well be used to atomize and crumble, or to store raw materials, while in agriculture,they are used to keep flowers, fruit, and vegetables

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Liu, Ming-Chung, and 劉銘忠. "Performance Analysis of Sub Type Two stage Vapor Compression Refrigeration System with R600a Hydrocarbon Refrigerant." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/3hfv8f.

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碩士<br>國立臺北科技大學<br>能源與冷凍空調工程系碩士班<br>98<br>Low-temperature storage refrigeration system is vital for much industry range. The traditional single-stage vapor compressor system is not suitable for low-temperature system; therefore, it should be used cascade refrigeration system. For many years, as a result of environmental protection issue related global warning and depletion of ozone layer caused by the use of synthetic refrigerants (CFC’s, HCFC’s and HFC’s), the return to the use of harmless natural substances as alternative refrigerants in refrigeration systems. Ammonia (R717) and hydrocarbon r

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Lee, Yi-sheng, and 李奕昇. "Experimental Studies of Small Vapor-Compression Refrigeration System & Wavy Channels within Plate Heat Exchangers." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/56005777296802138786.

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博士<br>國立臺灣大學<br>機械工程學研究所<br>91<br>This dissertation presents studies of a small vapor-compression refrigeration system and wavy channels within plate heat exchangers. In Part I, the performance of a domestic vapor-compression refrigeration system with isobutane (R600a) as the refrigerant was investigated. The input power of the compressor varied between 230 and 300 Watts, while the amount of the charged refrigerant was about 150 grams. The expansion and heat transfer components of the system were capillary tubes and plate heat exchangers (PHE), respectively. The refrigeration temperatures were

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GALOPPI, GIOVANNI. "DEVELOPMENT OF A RADIAL PISTON EXPANDER FOR VAPOR COMPRESSION CYCLES." Doctoral thesis, 2017. http://hdl.handle.net/2158/1082547.

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In recent years, heat pumps and refrigeration systems are widely used in both residential and industrial applications. The possibility of recovering the large throttling losses by using an expander could give a substantial contribution to the performance improvement. In this thesis, a reciprocating expander developed from a hydraulic motor was numerically and experimentally analyzed. A numerical model was developed to identify the needed small modifications to be made on the expander without change its architecture. Successively, an extensive experimental activity on the modified expander has

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KUMAR, CHANDAN. "THERMODYNAMIC ANALYSIS OF TWO-STAGE VAPOUR COMPRESSION REFRIGERATION SYSTEM INTEGRATED WITH AN ABSORPTION SYSTEM (LiBr-H2O)." Thesis, 2014. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15450.

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This work comprises energetic and exergetic analysis of two thermodynamic cycles: First one is a conventional two stage cooling system by steam compression of ammonia and the other is named integrated refrigeration system. The conventional system that has been used as reference in this work is largely used for cooling purpose in industrial sector. The integrated refrigeration system is similar to the conventional system, but it uses the intermediate cooling, between the stages of high and low pressure, by cold water in closed circuit. The cold water is supplied by LiBr-H2O absorption system in

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KUMAR, AMIT. "THERMODYNAMIC ANALYSIS OF MODIFIED VAPOUR COMPRESSION REFRIGERATION SYSTEM USED FOR HEATING WITH ALTERNATING REFRIGERANTS." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14537.

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SANGADE, NIKHIL VASANT. "PERFORMANCE EVALUATION OF MULTI EVAPORATOR VAPOUR COMPRESSION REFRIGERATION SYSTEM WITH LIQUID-VAPOUR HEAT EXCHANGER AND FLASH CHAMBER USING ALTERNATIVE PURE REFRIGERANTS." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15374.

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Parametric investigation of energy and exergy analysis of multi-evaporators at different temperatures with individual expansion valve and individual compressor using flash chamber and liquid vapour heat exchanger is carried out for R134A, R142B, R152A, R600 and R1234YF as alternative refrigerants. In engineering equation solver, a computational model is developed for these systems, simple multi-evaporator system and improved one system. The present investigation has been done for evaporator-I in the range -120C to -200C, evaporator-II in the range 10C to 40C and condenser in the range 350C to

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YADAV, BIPIN. "THE ORETICAL EXERGY ANALYSIS OF HFO-1234YF AND HFO-1234ZE AS AN ALTERNATIVE REPLACEMENT OF HFC-134A IN SIMPLE VAPOUR COMPRESSION REFRIGERATION SYSTEM." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14457.

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Chuang, Ying-Kai, and 莊穎凱. "Optimal Design of Compression Refrigeration System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/21143159344333646985.

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碩士<br>國立臺灣大學<br>化學工程學研究所<br>101<br>This research aims to develop a mathematical model for handling the design problem of a compression refrigeration system. A superstructure is firstly proposed which can be used to describe all possible configurations of a compression refrigeration system. By describing relevant constrains for each part of the superstructure, and adapting total compressor work or total annual cost as the objective function, the problem of designing the compression refrigeration system can be formulated as a mixed-integer nonlinear program (MINLP) that can then be solved ot det

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Prathiiikar, Anil Kumar. "Simulation and optimization compression-absorption refrigeration system." Thesis, 2006. http://localhost:8080/iit/handle/2074/5183.

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