• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.29 no.9
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• pp.70-74
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• 2000

소형에어컨의 대부분은 2004년까지 에너지절약법으로 정해진 목표기준을 달성하도록 의무화하고 있다. 또 오존층보호를 위해 신냉매로의 전환도 필요한 바, 본 보고에서는 소형에어컨의 에너지절약 기술과 신냉매 대응기술에 관하여 소개한다. 그밖에 에너지절약법의 목표기준을 달성하기 위해서 필요한 향후 연구과제에 대해서 기술한다.

• Journal of the korean Society of Automotive Engineers
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• v.16 no.2
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• pp.22-32
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• 1994

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.29 no.2
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• pp.20-23
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• 2000

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.36 no.1
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• pp.45-46
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• 2007

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.25 no.6
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• pp.479-488
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• 1996

• 유체기계공업학회:학술대회논문집
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• 2003.12a
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• pp.600-606
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• 2003

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.22 no.6
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• pp.345-352
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• 2010

In this study, external condensation heat transfer coefficients(HTCs) of R134a and R1234yf are measured on a plain, low fin, and Turbo-C tubes at the saturated vapor temperature of $39^{\circ}C$ with the wall subcooling of $3{\sim}8^{\circ}C$. R1234yf is a new alternative refrigerant of low greenhouse warming potential for replacing R134a which is one of the greenhouse gases controlled by Kyoto protocol and is used extensively in mobile air-conditioners. Test results show that the external condensation HTCs of R1234yf are very similar to those of R134a for all three surfaces tested. For the application of condensation heat transfer correlations to the design of condensers charged with R1234yf, thorough property measurements are needed for R1234yf in the near future.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.25 no.6
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• pp.489-505
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• 1996

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.25 no.6
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• pp.518-523
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• 1996

• Transactions of the Korean Society of Automotive Engineers
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• v.11 no.4
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• pp.196-203
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• 2003

This study was performed to design the optimal block type expansion valve through analyzing the characteristics of the block type expansion valve in automotive air conditioning system using HFC-134a. Because an alternative refrigerant (HFC-l34a) is being used instead of CFC-12 for automotive air conditioning system, newly designed air conditioning components are necessary due to changes in characteristics. The performance tests were accomplished through the test bench, that is manufactured based on the study. And then it was carried out to measure the variation of temperature and pressure at each part of the air conditioning system according to the compressor speed.