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Dissertations / Theses on the topic 'Alternative refrigerant'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Back, Izabelle, and Lars Dunberger. "Evaluating alternative refrigerants for the room air conditioner market." Thesis, KTH, Tillämpad termodynamik och kylteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173880.

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This study aimed to facilitate evaluation of alternative refrigerants for the air conditioner market. In order to achieve this target, two objectives were set. The first being the identification of alternative refrigerant with regard to regulations and trends. The second being enabling of thermodynamic evaluation of refrigerants for single components in air conditioners via design and installation of a test rig. A literature review was conducted to investigate the regulations, standards and trends for nine regions with high market shares. Furthermore, refrigerant substitutes for R410A and R22
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2

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

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HCFC-22 is the world�s most widely used refrigerant. It serves in both residential and commercial applications, from small window units to large water chillers, and everything in between. Its particular combination of efficiency, capacity and pressure has made it a popular choice for equipment designers. Nevertheless, it does have some ODP, so international law set forth in the Montreal Protocol and its Copenhagen and Vienna amendments have put HCFC-22 on a phase out schedule. In developed countries, production of HCFC-22 will end no later than the year 2030. Zeotropic blend HFC-407C has been
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3

Géryk, Ondřej. "Tepelná čerpadla ve vzduchotechnice." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225664.

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This thesis deals with issues of heat pumps for air conditioning purposes. Mainly addresses itself with physical principles of heat pumps and with division of heat pumps according to natural resources, from which they draw heat energy. The next part of this thesis dedicates itself to experimental measurement of air conditioning unit, which in winter time operates on the principle of heat pump. The last part of this thesis is focused on design of two options of employment of heat pumps as sources of heat and coldness for a central air handling unit, which regulates incoming air for a dining roo
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4

Lindeman, Lukas. "Refrigeration system performance using alternative refrigerants." Thesis, KTH, Energiteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188606.

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When running a refrigeration system, the refrigerant will always leak into the atmosphere in various ways. The leakage of currently used refrigerants have a non-negligible impact on the global warming. The European Commission recently approved the Regulation No 517/2014 on fluorinated greenhouse gases (FGR). This regulation implies, among other, that refrigerants with GWP of 2500 or more will be restricted from being used in stationary refrigeration equipment being placed on European refrigeration market. In this study a number of new refrigerants are analysed and evaluated as potential replac
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5

Eriksson, Peter. "Refrigeration system performance using alternative refrigerants." Thesis, KTH, Energiteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175160.

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The European Parliament has shown its legislative capabilities by adopting a tough approach on the reduction of fluorinated gases (F-gases). The EU Regulation No 517/2014, will phase out F-gases with high global warming potential (GWP) within a well-defined step down time schedule. This will affect refrigerants which are commonly used in commercial cooling applications. While the time schedule implies existence of replace- ment refrigerants, the market continues to develop alternatives for the refrigerants already in deployment. Though the R404A,which is a commonly used refrigerant in station-
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6

Colbourne, Daniel Henry. "Methods for assessing environmental, safety and performance of alternative refrigerants." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1445386/.

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This thesis addresses the general subject of implementation of refrigerants that are alternatives for ozone depleting substances. In particular it covers three topics, which are environmental assessment, system performance and safety aspects related to flammability. The first Part examines the current means of assessing the global wanning impact of systems, and proposes an improved approach. The second Part presents a new balancing technique for designing systems that use refrigerants with a temperature glide, as an advancement over the conventional technique for pure refrigerants. The third P
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7

Junio, Urbano José. "Análise comparativa da performance de unidades de ar condicionado tipo janela usando R22, R290 e R600a." Universidade Federal de Pernambuco, 2008. https://repositorio.ufpe.br/handle/123456789/5304.

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Made available in DSpace on 2014-06-12T17:37:59Z (GMT). No. of bitstreams: 2 arquivo3817_1.pdf: 7647532 bytes, checksum: 5910a7ab4e76749595677083317b8c54 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2008<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Há uma crescente preocupação mundial a respeito da destruição da camada de ozônio envolvendo a terra. Os CFCs, como o R-12, foram identificados como de alto poder destruidor da camada de ozônio (ODP), pela presença de cloro em sua estrutura. Os HCFCs, como o R-22, por
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8

Dias, João Paulo. "Escoamento de óleo e refrigerante pela folga pistão-cilindro de compressores herméticos alternativos." Florianópolis, 2012. http://repositorio.ufsc.br/xmlui/handle/123456789/99466.

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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Mecânica.<br>Made available in DSpace on 2013-03-04T20:42:10Z (GMT). No. of bitstreams: 1 304353.pdf: 28322357 bytes, checksum: 34efb2d7cd1ad9803a2f6b3055f26206 (MD5)<br>O conhecimento do processo de lubrificação das partes móveis dos compressores alternativos herméticos, sobretudo do pistão, é de importância fundamental na concepção de sistemas de refrigeração mais eficientes. A existência de uma pequena folga entre o pistão e o cilindro permite que movimentos radiais do pist
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9

Medeiros, Pedro Samuel Gomes. "Desenvolvimento e caracteriza??o de solu??es tern?rias ?gua-glicerol-propilenoglicol como fluido refrigerante secund?rio." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15696.

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Made available in DSpace on 2014-12-17T14:58:19Z (GMT). No. of bitstreams: 1 PedroSGM_DISSERT.pdf: 2326508 bytes, checksum: 0470d41afc69c7b0199856916c484045 (MD5) Previous issue date: 2012-12-17<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>Cada vez mais o mundo est? adotando uma matriz energ?tica limpa e sustent?vel, com o uso da agricultura para produ??o de agroenergia e combust?veis verdes, como bioetanol e biodiesel. A produ??o do biodiesel gera um coproduto, a glicerina, em que as usinas produtoras t?m dificuldades com o destino do seu excedente. V?rias pesquisas e
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10

Fiorelli, Flávio Augusto Sanzovo. "Análise do escoamento de fluidos refrigerantes alternativos ao HCFC22 em tubos capilares adiabáticos." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/3/3132/tde-24102001-160408/.

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Este trabalho apresenta os resultados da pesquisa "Análise do Escoamento de Fluidos Refrigerantes Alternativos ao HCFC 22 em Tubos Capilares Adiabáticos", desenvolvida para obtenção do título de Doutor em Engenharia no Departamento de Engenharia Mecânica da EPUSP. Essa pesquisa foi motivada pelas resoluções do Protocolo de Montreal, que prevêem a eliminação gradativa do HCFC 22 e, conseqüentemente, impõem a necessidade da realização de estudos sobre o comportamento de fluidos alternativos ecologicamente aceitáveis nos sistemas de refrigeração e seus componentes. Até o momento, as pesquisas e a
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11

Alvarsson, Johan, and Victor Sjöström. "Konvertering av Kraftringens geotermianläggning : Undersökning av alternativ till köldmediet R134a." Thesis, Linnéuniversitetet, Sjöfartshögskolan (SJÖ), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-74372.

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I Kraftringens geotermianläggning cirkulerar köldmediet R134a som är en fluorerande växthusgas med relativt hög GWP (Global Warming Potential). När den nya F-gasförordningen trädde i kraft 2015 resulterade det i att priserna ökade markant på de köldmedierna med hög GWP. Kraftringen vill därför undersöka vilka konverteringsalternativ det finns till R134a, dels för att minska på kostnaderna men också för att minimera verksamhetens klimatpåverkan.   Olika köldmedier har jämförts med avseende på hur de påverkar anläggningens prestanda. Det har också undersökts vilka köldmedier som ligger inom rätt
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12

de, Castro Silva José. "Análise experimental de sistemas de refrigeração operando com R-290 e R-600a como fluidos refrigerantes alternativos." Universidade Federal de Pernambuco, 2008. https://repositorio.ufpe.br/handle/123456789/5312.

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Made available in DSpace on 2014-06-12T17:38:02Z (GMT). No. of bitstreams: 2 arquivo3821_1.pdf: 7987098 bytes, checksum: dc96bd795cfbebffffa0b7bedb4a8308 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2008<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Os refrigerantes CFCs (clorofluorcarbonos) como o R-12, foram identificados como de alto poder destruidor da camada de ozônio que protege a superfície da terra, devido à presença de cloro em sua estrutura. Os HCFCs (hidroclorofluorcarbonos) como o R-22, por possuírem cl
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13

Jao, Yong Kang, and 趙永康. "Refrigeration Cycle Efficiency Analysis of Alternative Refrigerant R-134a." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/34695406443677015624.

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14

Chen, Chun-I., and 陳俊鎰. "Boiling Heat Transfer of Binary Alternative Refrigerant Mixtures in a Narrow Space." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/70664028024839909035.

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碩士<br>國立成功大學<br>化學工程學系<br>86<br>In order to achieve even higher heat transfer rate of computer chips the use of the phase-change liquid immersion cooling has been considered. As the name implies, direct liquidimmersion cooling brings the coolant into direct physical contact with the chips or electronic packages to be cooled. Consequently, it is important that the coolants used exhibit dielectriccharacteristics which do not adversely effect circuit delay. Equally important, the coolant must
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15

Hung, Pao-Lien, and 洪寶蓮. "A Study on the Future Developed Trend of New Alternative Refrigerant Technology." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/17312414448017845407.

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碩士<br>中華大學<br>科技管理研究所<br>92<br>With the awareness of environmental protection, refrigerants used by the past refrigeration and air condition industries may be banned. If the industries can’t search the overall solution, they must face the pressure of environmental protection and social conscience. Therefore, under the awareness of global environmental protection, to search for and develop innovative technology of alternative refrigerant is currently the industries’ important task. This study attempts to construct indicator system of new alternative refrigerant technological development through
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16

Chen, Yi Jie, and 陳逸傑. "R22 and Its Alternative Refrigerant R407C Compare with Physical Behavior in Capillary Tubes." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/96551189081023731775.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>89<br>This paper mainly discusses flow characters of the R407C refrigerant in the capillary tube by using computer numerical simulation, and make a comparison with experimental data in early papers. Theoretical analysis is divided into two important parts:1.Mixing:since R407C is not co-boiling mixing refrigerant, we must clearly confer related thermodynamics properties of every species after mixing in the two-phase region. And then we can correctly simulate two-phase changes of R407C；2.Construct governing equations of flow in the capillary tube. On the ba
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17

Huang, Shih-Tzuen, and 黃世尊. "Investigations4of pool boiling of R-22 and alternative refrigerant mixture R-32/R-134a." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/69790624475508036658.

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18

Ramaswamy, M. "A study on mixtures of non-CFC refrigerants alternative to CFC-12 for refrigeration systems." Thesis, 1995. http://localhost:8080/iit/handle/2074/5040.

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19

TSAI, YUNG-CHUN, and 蔡永俊. "Experimental Investigation of an Alternate Refrigerant R-32 for R410A in Split Air Conditioner." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/78302647476824584993.

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碩士<br>東南科技大學<br>機械工程研究所<br>104<br>This study used R32 refrigerant in a small R410A split air conditioner (SAC) to evaluate the performance and feasibility of using these different mass (300g, 400g, 500g, 600g, and 700g) R32 alternative refrigerants by conducting the power consumption, the cooling capacity and the energy efficiency ratio (EER) tests. The experimental setup was based on the charged mass of R410A refrigerant is 700g, the power consumption is 0.909kW, the cooling capacity is 2.28 kW, and the EER is 2.6. The research successfully developed the alternative procedure of a small R410A
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20

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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21

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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22

"Análise do escoamento de fluidos refrigerantes alternativos ao HCFC22 em tubos capilares adiabáticos." Tese, Biblioteca Digital de Teses e Dissertações da USP, 2000. http://www.teses.usp.br/teses/disponiveis/3/3132/tde-24102001-160408/.

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