Chang, YS Kim, MS Ro, ST 2024-01-21T14:07:05Z 2024-01-21T14:07:05Z 2022-01-10 2000-05 0140-7007 https://pubs.kist.re.kr/handle/201004/141419 Performance of a heat pump system using hydrocarbon refrigerants has been investigated experimentally. Single component hydrocarbon refrigerants (propane, isobutane, butane and propylene) and binary mixtures of propane/isobutane and propane/butane are considered as working fluids in a heat pump system. The heat pump system consists of compressor, condenser, evaporator, and expansion device with auxiliary facilities such as evacuating and charging unit, the secondary heat transfer fluid circulation unit, and several measurement units. Performance of each refrigerant is compared at several compressor speeds and temperature levels of the secondary heat transfer fluid. Coefficient of performance (COP) and cooling/heating capacity of hydrocarbon refrigerants are presented. Experimental results show that some hydrocarbon refrigerants are comparable to R22. Condensation and evaporation heat transfer coefficients of selected refrigerants are obtained from overall conductance measurements for subsections of heat exchangers, and compared with those of R22. It is found that heat transfer is degraded for hydrocarbon refrigerant mixtures due to composition variation with phase change. Empirical correlations to estimate heat transfer coefficients for pure and mixed hydrocarbons are developed, and they show good agreement with experimental data. Some hydrocarbon refrigerants have better performance characteristics than R22. (C) 2000 Elsevier Science Ltd and IIR. All rights reserved. English ELSEVIER SCI LTD DOMESTIC REFRIGERATORS PROPANE Performance and heat transfer characteristics of hydrocarbon refrigerants in a heat pump system Article 10.1016/S0140-7007(99)00042-0 1 INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, v.23, no.3, pp.232 - 242 INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 23 3 232 242 scie scopus 000085715000007 Thermodynamics Engineering, Mechanical Thermodynamics Engineering Article DOMESTIC REFRIGERATORS PROPANE heat transfer mass transfer refrigerant R22 hydrocarbon condensation evaporation heat pump heat transfer coefficient simulation measurement