• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.32 no.5
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• pp.45-51
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• 2003

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.14 no.3
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• pp.222-231
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• 1985

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.32 no.4
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• pp.30-38
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• 2003

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.22 no.6
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• pp.411-416
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• 1993

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.15 no.2
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• pp.123-143
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• 1986

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.19 no.4
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• pp.219-224
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• 1990

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.39 no.5
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• pp.42-47
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• 2010

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.25 no.4
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• pp.201-207
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• 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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• v.14 no.3
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• pp.102-109
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• 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.

• Transactions of the Korean Society of Automotive Engineers
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• v.6 no.2
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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.