• 대한설비공학회지:설비저널
• /
• 제32권5호
• /
• pp.45-51
• /
• 2003

• 대한설비공학회지:설비저널
• /
• 제14권3호
• /
• pp.222-231
• /
• 1985

• 대한설비공학회지:설비저널
• /
• 제32권4호
• /
• pp.30-38
• /
• 2003

• 대한설비공학회지:설비저널
• /
• 제22권6호
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• pp.411-416
• /
• 1993

• 대한설비공학회지:설비저널
• /
• 제15권2호
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• pp.123-143
• /
• 1986

• 대한설비공학회지:설비저널
• /
• 제19권4호
• /
• pp.219-224
• /
• 1990

• 대한설비공학회지:설비저널
• /
• 제39권5호
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• pp.42-47
• /
• 2010

• 설비공학논문집
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• 제25권4호
• /
• pp.201-207
• /
• 2013

The performance of automobile air conditioning systems of R1234yf was evaluated and compared with that of R134a. In particular, the performance evaluation was carried out by installing an internal heat exchanger in order to improve the performance of the system used in R1234yf. A performance comparison between the R1234yf and R134a for automotive air conditioning revealed that the cooling capacity and COP of the 1234yf system without the IHX decreased by up to 7% and 4.5%, respectively, but those with the IHX decreased by up to 1.8% and 2.9%, respectively.

• International Journal of Air-Conditioning and Refrigeration
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• 제14권3호
• /
• pp.102-109
• /
• 2006

Experimental results for heat transfer characteristics and pressure gradients of HCs refrigerants R-290, R-600a, R-1270 and HCFC refrigerant R-22 during evaporating inside horizontal double pipe heat exchangers are presented. The test sections which has one tube diameter of 12.70 mm with 0.89 mm wall thickness, another tube diameter of 9.52 mm with 0.76 mm wall thickness are used for this investigation. The local evaporating heat transfer coefficients of hydrocarbon refrigerants were higher than that of R-22. The average evaporating heat transfer coefficient increased with the increase of the mass flux, with the higher values in hydrocarbon refrigerants than R-22. Hydrocarbon refrigerants have higher pressure drop than R-22. Those results from the investigation can be used in the design of heat exchangers using hydrocarbons as the refrigerant for the air-conditioning systems.

• 한국자동차공학회논문집
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• 제6권2호
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• pp.203-211
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• 1998

The system performance of an automobile air conditioning system with variations of charging conditions has been investigated experimentally. An automobile air conditioning system was composed of laminated type evaporator, parallel flow type condenser, swash plate type com-pressor, externally equalized thermostatic expansion valve and receiver drier. The objective of this study was to quantify the influence of the refrigerant charge under the steady state operation of an automobile air conditioning system. The results indicated that a 10% undercharge caused a 10% reduction in the capacity of evaporator.