자동차 공조기용 R12 및 R134a 대체 냉매의 성능평가 = Performance of Alternative Refrigerants for R12 and R134ain Automobile Air-Conditioners

다국어 초록 (Multilingual Abstract)

In this study, natural refrigerants and their mixtures that can supplement and replace R12 and R134a in automobile air-conditioners are studied. R134a is currently used as the refrigerant in new motor vehicle air conditioners, replacing the ozone depleting refrigerant R12. Although R134a has no ozone depletion potential, it has a relatively large global warming potential, approximately 1300times that of CO2 over a 100year time horizon. For this reason, performance of natural refrigerants and their mixtures containing R152a, RE170 (Dimethylether, DME) and R600a (Isobutane) are measured under 2 different temperature conditions. They were tested in a refrigerating bench tester with an open type compressor. The test bench provided about 4kW capacity and water and water/glycol mixture were employed as the secondary heat transfer fluids. Test results show that the coefficient of performance (COP) of these refrigerants is up to 21.55% higher than that of R12 in all temperature conditions. Overall, these fluids provide good performance with reasonable energy savings without any environmental problem and thus can be used as long term alternatives for automobile air-conditioners.

참고문헌 (Reference)

1 Maclaine-cross, I.L., "Why hydrocarbons save energy?" 51 : 33-37, 1997

2 Radermacher, R., "Theor- etical analysis of replacement refrigerants for R22 for residential uses" 99 : 333-343, 1993

3 Kruse, H., "The state of the art of the hydrocarbon technology in household refrigeration" 179-188, 1996

4 Jung, D., "Testing of propane/isobutane mixture in domestic refrigerators" 23 : 517-527, 2000

5 Didion, D.A., "Role of refrigerant mixtures as alternatives to CFCs" B : 163-175, 1990

6 McLinden, M.O., "NIST thermodynamics and transport properties of refrigerants and Refrigerant Mixtures"

7 "Montreal Protocol on Substances That De- plete the Ozone Layer"

8 Int. Energy Agency’s Heat Pump Center, "Hydrocarbons as refrigerants in residential heat pumps and air-conditioners"

9 Mulroy, W., "Experimental evaluation of two refrigerant mixtures in a bread- board air conditioner" 27-34, 1988

10 Jung, D., "Evaluation of supplementary/retrofit refrigerants for automobile air-conditioners charged with CFC12" 22 : 558-568, 1999

11 Jetter, J., "Evaluation of alternatives for HFC-134a refrigerant in motor vehicle air conditioning" 845-854, 1996

12 Intergovernmental Panel on Climate Change, "Climate change 1995：The science of climate change" Cambridge University Press 22-, 1996