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Dissertations / Theses on the topic 'Refrigeration machines'

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Published: 28 May 2022

Last updated: 30 July 2025

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1

Riley, Caryn M. "Current-based sensorless vibration monitoring of small ac machines." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/13741.

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2

Vicatos, George. "Heat and mass transfer characteristics: design and optimisation of absorption refrigeration machines." Doctoral thesis, University of Cape Town, 1995. http://hdl.handle.net/11427/17476.

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Bibliography: pages 205-209.<br>An extensive literature study on the subject of absorption refrigeration has revealed that there is no proven methodology that can be used to design, optimise and size a plant. On the contrary there are numerous methods which analyse the performance of an existing plant from collected data. These methods however, do not provide any means of predicting how the analysed plant would perform if one or more of its working conditions should change. This work provides a complete design for an ammonia-water absorption refrigeration plant. The ranges of the working condi

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3

Вертепов, Юрій Михайлович, Юрий Михайлович Вертепов, Yurii Mykhailovych Vertepov, Е. А. Омельяненко та А. В. Можаровский. "Оптимизация энергетической зффективности разомкнутого регенеративного вакуумного цикла с тепломассообменом разомкнутой воздушной холодильной машины для посадки с натягом". Thesis, Издательство СумГУ, 2007. http://essuir.sumdu.edu.ua/handle/123456789/19370.

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Энергетическая эффективность работы разомкнутой ВХМ, работающей по регенеративному вакуумному циклу с тепломассообменом, в значительной степени зависит от оптимального выбора отношения давлений в вакуумном насосе, причем как для теоретического, так и для действительного циклов. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/19370

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4

Delano, Andrew D. "Design analysis of the Einstein refrigeration cycle." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17578.

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5

Delano, Andrew Douglas. "Analysis of the Einstein refrigeration cycle." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/17887.

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6

Wilson, Kyle B. "The use of Sage simulation software in the design and testing of Sunpower's pulse tube cryocooler." Ohio : Ohio University, 2005. http://www.ohiolink.edu/etd/view.cgi?ohiou1126908659.

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7

Mansouri, Rami. "Theoretical and experimental study of absorption and absorption/diffusion refrigerating machines using ammonia as a refrigerant: simulation under steady-state and dynamic regimes and experimental characterization of a pilot." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/399538.

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ASPEN-Plus se utilizó para llevar a cabo investigaciones en régimen estacionario sobre una máquina comercial de refrigeración de absorción de 3 toneladas (10 kW de capacidad de refrigeración) accionada con gas natural y un refrigerador de difusión-absorción (DAR) de pequeña potencia (7.5 W de capacidad de refrigeración).Antes de iniciar las simulaciones, se selecciona entre los nueve modelos implementados en la librería de ASPEN-Plus, el modelo adecuado para estimar las propiedades termodinámicas del fluido de trabajo amoníaco/agua en amplios rangos de temperatura (273,16 ≤ T ≤ 613,15 K) y de

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8

Menegay, Peter. "Experimental investigation of an ejector as a refrigerant expansion engine." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10222009-124957/.

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9

Mirza-Tolouee, Changiz M. "Experimental study of zeotropic refrigerant mixture HFC-407C as a replacement for HCFC-22 in refrigeration and air-conditioning systems." Australasian Digital Thesis Program, 2006. http://adt.lib.swin.edu.au/public/adt-VSWT20070416.141307/index.html.

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Thesis (PhD) - Swinburne University of Technology, Faculty of Engineering and Industrial Sciences, 2006.<br>A thesis submitted for the degree of Doctor of Philosophy, School of Engineering and Science, Swinburne University of Technology, 2006. Typescript. Includes bibliographical references (p. 123-127).

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10

Altenhof, Jeffrey L. "Computer-aided concurrent engineering in refrigeration system design." Master's thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-01262010-020010/.

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11

O'Loughlin, R. L. "Optimal design of organic refrigerant reverse cycle absorption air conditioning systems /." Title page, contents and abstract only, 1986. http://web4.library.adelaide.edu.au/theses/09ENS/09enso52.pdf.

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12

Dardour, Houda. "Étude des machines frigorifiques à absorption et à absorption-diffusion utilisant un mélange d'alcanes : étude systémique et modélisation rigoureuse de l'absorbeur." Thesis, Pau, 2012. http://www.theses.fr/2012PAUU3013/document.

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Le présent travail est consacré en premier lieu à l'investigation des limites de fonctionnement et de performances des machines frigorifiques à absorption et absorption-diffusion utilisant des mélanges d'alcanes comme fluides de travail et l'analyse en second lieu du processus d'absorption le long d'un absorbeur à film tombant en présence d'un gaz inerte. Dans le cas d'un refroidissement à l’eau les meilleures performances réalisées sont celles d'une machine utilisant le binaire C₃H₈/n-C₉H₂₀ avec un COP de l'ordre de 0.51 dans l'intervalle de la température de la chaleur motrice [110-125℃]. Un

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13

Dobre, Catalina Georgiana. "Développement de méthodes thermodynamiques pour l'ingénieur : étude analytique et expérimentale de machines quasi-Carnot et Stirling." Thesis, Paris 10, 2012. http://www.theses.fr/2012PA100111/document.

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La première partie de la thèse comporte l’étude des machines à froid, en tenant compte de la vitesse finie des processus. L’approche est basée sur une nouvelle méthode d’optimisation des processus et cycles à vitesse finie, la Méthode Directe d’étude et évaluation des irréversibilités. Les performances de ces cycles sont évaluées en prenant en compte les irréversibilités internes générées par la vitesse finie, notamment (1) les pertes de pression dues au laminage, (2) les pertes de pression dues à la vitesse finie du piston, (3) les pertes de pression dues aux frottements interne et mécanique

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14

Lough, Benjamin C. C. "Investigations into thermionic cooling for domestic refrigeration." School of Engineering Physics - Faculty of Engineering, 2004. http://ro.uow.edu.au/theses/230.

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Thermionic refrigeration using semiconductor heterostructures is examined theoretically and experimentally. A theory of single-barrier devices is first developed where two classes of single-barrier devices are defined and compared. So-called class 1 devices are found to always perform better. A theory of multiple-barrier devices based on class 1 barriers is then developed using a numerical solution. Experimentally, three generations of 10-barrier devices based on A1(subscript x)Ga(subscript 1-x)As-GaAs heterostructures were made and electrically characterised. This material is by no means idea

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15

Herman, David Laurence. "Experimental optimization of cooling tower fan control based on field data." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/16629.

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16

Weber, Eric Dean. "Modeling and general optimization of commercial building chiller/cooling tower systems." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/16874.

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17

Li, Yong, and 李勇. "Performance prediction model for a rotary multi-bed adsorption coolingsystem." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31245742.

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18

Kharazi, Amir Ahmadzadeh. "Study of a novel R718 turbocompression cycle." Diss., Connect to online resource - MSU authorized users, 2006.

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Thesis (Ph. D.)--Michigan State University. Dept. of Mechanical Engineering, 2006.<br>Title from PDF t.p. (viewed on June 19, 2009) Includes bibliographic references (p. 84-89). Also issued in print.

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19

Moorehead, Lynnette Ann. "Design optimization of cooling tower systems for dual-stage absorption chillers." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/16360.

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20

Al-Ansary, Hany A. M. "Investigation and improvement of ejector-driven heating and refrigeration systems." Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-06072004-131032/unrestricted/al-ansary%5Fhany%5Fa%5Fm%5F200405%5Fphd.pdf.

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21

Gowreesan, Vamadevan. "Process-structure-property relationship of micro-channel tube for CO₂ climate control systems." Ohio : Ohio University, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1107891543.

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22

Walters, Joseph D. "Optimization and Thermodynamic Performance Measures of a Class of Finite Time Thermodynamic Cycles." PDXScholar, 1990. https://pdxscholar.library.pdx.edu/open_access_etds/1186.

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Modifications to the quasistatic Carnot cycle are developed in order to formulate improved theoretical bounds on the thermal efficiency of certain refrigeration cycles that produce finite cooling power. The modified refrigeration cycle is based on the idealized endoreversible finite time cycle. Two of the four cycle branches are reversible adiabats, and the other two are the high and low temperature branches along which finite heat fluxes couple the refrigeration cycle with external heat reservoirs. This finite time model has been used to obtain the following results: First, the performance of

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23

Hill, John Michael. "Simulation of a variable speed air conditioner as a multiple loop thermal system." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/16754.

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24

Joyce, Charles Thane. "Optimized design of a commercial building chiller/cooking tower system." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/24115.

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25

Mavalankar, Aquila Mukund. "Thermometry and refrigeration using quantum dots." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708092.

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26

Nascimento, Ubiraci Silva. "Carvão de babaçu como fonte termica para sistema de refrigeração por absorção no estado do Maranhão." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265326.

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Orientador: Jorge Isaias Llagostera Beltran<br>Dissertação (mestrado profissional) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-04T02:56:29Z (GMT). No. of bitstreams: 1 Nascimento_UbiraciSilva_M.pdf: 4551351 bytes, checksum: d36f11b4eb3e73786c0d3e1a3785be33 (MD5) Previous issue date: 2004<br>Resumo: Neste trabalho procurou desenvolver-se uma análise teórica da utilização integral do babaçu como fonte energética, procurando da ênfase às potencialidades agregadas ao carvão. Foi realizado um estudo de caso em municípios maranhenses

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27

Chen, Chung-Kang. "Applications of substructuring methods to the dynamic finite element analysis of a container refrigeration unit frame structure /." Online version of thesis, 1992. http://hdl.handle.net/1850/11688.

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28

Schneider, Thomas. "An experimental investigation of the finite time efficiency of a Peltier refrigeration device." PDXScholar, 1991. https://pdxscholar.library.pdx.edu/open_access_etds/4261.

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Since the need of energy conservation has become more and more urgent in the past decades, there has been an increased interest in the study and development of more efficient energy conversion systems. One of the fields that have arisen from that endeavor is a branch of physics called Finite Time Thermodynamics (FIT). It may be said that FIT was initiated through the famous paper by Curzon and Ahlborn (1975) that established new bounds on the efficiency of a finite time Carnot heat engine. Before, the traditional treatments gave a fundamental upper limit on the efficiency of any heat engine. H

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29

Conrad, Theodore Judson. "Miniaturized pulse tube refrigerators." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41108.

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Pulse tube refrigerators (PTR) are robust, rugged cryocoolers that do not have a moving component at their cold ends. They are often employed for cryogenic cooling of high performance electronics in space applications where reliability is paramount. Miniaturizing these refrigerators has been a subject of intense research interest because of the benefits of minimal size and weight for airborne operation and because miniature coolers would be an enabling technology for other applications. Despite much effort, the extent of possible PTR miniaturization is still uncertain. To partially remedy th

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30

Jurns, John M. "Flow of sub-cooled cryogens through a Joule-Thomson device : investigation of metastability conditions." Cleveland, Ohio : Cleveland State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=csu1198954696.

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Thesis (M.S.)--Cleveland State University, 2007.<br>Abstract. Title from PDF t.p. (viewed on May 8, 2008). Includes bibliographical references (p. 80-82). Available online via the OhioLINK ETD Center. Also available in print.

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31

Swart, JC. "Solar refrigeration using the Peltier Effect." Thesis, Cape Technikon, 1996. http://hdl.handle.net/20.500.11838/1153.

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Thesis (Master Diploma (Electrical Engineering))--Cape Technikon, Cape Town,1996<br>In order to design a coolerbox, utilising Thermo-electric technology as a heat pump, it was necessary to determine if this type of technology would be suitable for a coolerbox heat pump application. A detailed TEC (Thermo Electric Cooler) sizing estimation was done, using formulas supplied by the manufacturer, and using thermo-electric themy formulas to calculate the absolute theoretical performance parameters for a suitable TEe The correct heat pumping capability is important since.it is possible to

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32

Belaid, Ashur Belaid. "A six-chamber medium-to-high temperature refrigeration system for laboratory purposes." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2522.

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Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2017.<br>Food and water fuel and sustain life on earth. Since ancient times, their sourcing and preservation have been very important issues to humanity. In modern times, experimentation is a major step in analysing how cold storage problems in the medical and food science technology fields can be addressed. For investigating spoilage of new products and/or growth of pathogens in such cases, it is necessary to do experiments at different low temperatures for prolonged periods and check the effects. While this can

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33

White, S. D. "Design and modelling of novel absorption refrigeration cycles /." Title page, contents and summary only, 1993. http://web4.library.adelaide.edu.au/theses/09PH/09phw5878.pdf.

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34

Duke, Connor R. "Optimization of control source and error sensor locations in free field active noise control /." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2087.pdf.

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35

Kelly, Allan D. "Dynamic finite element modeling and analysis of a hermetic reciprocating compressor." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-01242009-063231/.

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36

Golden, James Hollis. "Ammonia - water desorption in flooded columns." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44884.

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Refrigeration systems employing the NH3-H2O absorption cycle provide cooling using a thermal energy input. This cycle relies on the zeotropic nature of the refrigerant - absorbent pair: because of the difference in boiling temperatures between NH3 and H2O, they can be separated through selective boiling in the desorber. Desorbers with counter-current flow of the solution and generated vapor enable efficient heat and mass transfer between the two phases, reducing the absorbent content in the generated vapor. Flow visualization experiments at temperatures, concentrations and pressures represen

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37

Craun, Matthew Ashby. "Identification of sound transmission paths within a hermetic reciprocating refrigeration compressor via multiple-input/single-output modeling." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-09192009-040610/.

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38

Périer-Muzet, Maxime. "Modélisation et simulation dynamique d’une machine de réfrigération thermoacoustique solaire." Thesis, Pau, 2012. http://www.theses.fr/2012PAUU3028/document.

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La réfrigération solaire est une alternative à la production de froid à partir de machines à compression mécanique de vapeur dont l’alimentation est électrique. Parmi les technologies envisageables, le couplage d’une machine de réfrigération thermoacoustique avec un concentrateur solaire et un stockage frigorifique par chaleur latente apparait comme une option intéressante. Cette thèse introduit la problématique du sujet et présente les différentes technologies envisageables pour la conception d’un réfrigérateur thermoacoustique solaire. Ensuite, pour répondre au problème, le prototype expérim

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39

Zulu, Andrew. "Thermodynamic analysis of a three-fluid absorption refrigeration machine." Master's thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/5445.

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Bibliography: leaves 66-69.<br>This thesis investigates the three-fluid absorption refrigeration system operating on lowgrade (heat) energy. In particular the temperature-time response of the various components of a domestic size absorption unit were investigated with respect to the pressure of hydrogen in the system under varying power input. Design modifications of the boiler, lift tube, vapour-liquid separator and heat exchanger were made while maintaining the same principle of operation.

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40

Sharp, Joshua Glenn. "Experimental determination of the feasibility of waste heat recovery in data centers using ejector based refrigeration." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41060.

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The purpose of this thesis is to experimentally determine the feasibility of an ejector based, waste heat recovery driven refrigeration system applied to the data center environment in order to reduce operational cooling costs. A comprehensive literature review is detailed to determine the current state of the ejector refrigeration research and assess the initial direction of this thesis. A simplified model was created to perform preliminary performance estimations and system sizing before constructing an experimental system apparatus to evaluate the model predictions. The pressures and temper

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41

Yeung, King-ho, and 楊景豪. "An optimization model for a solar hybrid water heating and adsorption ice-making system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B29632432.

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42

Zingano, Bernard Wilson. "Effects of solar radiation on buildings and thermal comfort." Thesis, University of Hertfordshire, 2003. http://hdl.handle.net/2299/14151.

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This work was undertaken to investigate the perceived problem of Thermal Discomfort in Malawi. One observable effect of thermal discomfort was the amount of foreign exchange that was spent to import air conditioning devices. The purpose of the work was to find out, and quantify the problem of thermal discomfort and outline its effects to the people and country. In order to investigate the problem of thermal discomfort in depth in a place where the necessary data hardly existed a lot of work had to be done. The work has been outlined in four stages of research, analysis and documentation and th

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43

Alkilani, Fouad M. "A solar assisted high temperature refrigeration system for postharvest pre-storage fruit cooling." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2557.

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Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2017.<br>Agriculture has emerged as a major economic activity in the African continent. Therefore, fruits and vegetables are considered as essential source of vitamins, minerals and proteins. However, fruits and vegetables are perishing rapidly. Thus, the adequate handling starts from the field, by applying appropriate method of storage and preservation in order to reduce post-harvest losses and extend its shelf life. Preservation by removing heat from the products is the most common method of preservation.

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44

You, Ying 1962. "A solar adsorption refrigeration system operating at near atmospheric pressure." Monash University, Gippsland School of Engineering, 2001. http://arrow.monash.edu.au/hdl/1959.1/8740.

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45

Lucchi, Michael <1989&gt. "Dynamic models for the analysis of vapour-compression refrigerating machines." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amsdottorato.unibo.it/9359/1/Michael%20Lucchi%20-%20Cycle%20XXXII.pdf.

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Vapour-compression refrigeration systems represent one of the most relevant fields in terms of energy consumption. Among the research works aimed at reducing their environmental impact, those related to control systems are appealing, since they usually involve lower costs than interventions at system level and directly affects the energy consumption. In this work, a library of models able to reproduce the dynamics of the main components of a vapour-compression refrigeration machine has been developed in Matlab/SIMULINK to supply the building blocks to investigate the effects of different cont

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46

Fourie, Marna. "A subcritical and transcritical carbon dioxide refrigeration system utilizing multiple expansion devices." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86380.

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Thesis (MScEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Carbon dioxide is a natural gas that has been used as a refrigerant as far back as the 1850s. It was then primarily used because it was easily obtainable and non-toxic. Due to the high operating pressure and relatively low critical temperature (and high critical pressure) of CO2, it was gradually phased out and replaced with hydrochlorofluorocarbons and chlorofluorocarbons. With the discovery of the greenhouse effect, greenhouse gasses and ozone depleting gasses, the Montreal Protocol and the Kyoto Protocol were placed into e

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47

Soares, Darrow P. "Curriculum in mathematics for air conditioning and refrigeration." CSUSB ScholarWorks, 1996. https://scholarworks.lib.csusb.edu/etd-project/1239.

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48

Al-Ansary, Hany A. "Investigation and improvement of ejector-driven heating and refrigeration systems." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/36540.

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49

Mulcahey, Thomas Ian. "Convective instability of oscillatory flow in pulse tube cryocoolers due to asymmetric gravitational body force." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51808.

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Pulse tube cryocoolers (PTCs) are among the most attractive choices of refrigerators for applications requiring up to 1 kW of cooling in the temperature range of 4-123 K as a result of the high relative efficiency of the Stirling cycle, the reliability of linear compressors, and the lack of cryogenic moving parts resulting in long life and low vibration signature. Recently, PTCs have been successfully used in applications in the 150 K range, extending the useful range of the device beyond the traditional cryogenic regime. A carefully designed cylindrical cavity referred to as the pulse tube re

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50

Forson, Francis Kofi. "Modelling and experimental investigation of a mixed-mode natural convection solar crop dryer (MNCSD)." Thesis, De Montfort University, 1999. http://hdl.handle.net/2086/4201.

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