Lee, DY Ahn, Y Kim, Y Kim, Y Chang, YS Nam, L 2024-01-21T10:13:43Z 2024-01-21T10:13:43Z 2021-09-01 2002-08 0140-7007 https://pubs.kist.re.kr/handle/201004/139357 A drop-in test of a mixed refrigerant R407C is performed in a commercial screw chiller with shell-and-tube heat exchangers originally designed for R22. The test results show a severe performance reduction when substituting the refrigerant from R22 to R407C. The reason for the performance reduction is analyzed comprehensively, and the influence of thermodynamic properties, compressor efficiency, and heat transfer is evaluated quantitatively. The major factor causing the performance reduction is assessed as the degradation of the heat transfer in using the mixed refrigerant, R407C. The heat transfer degradation in the evaporator is found to be larger and influences more on the chiller performance reduction. The performance reduction caused by the evaporator is approximately two times compared with that of the condenser. (C) 2002 Elsevier Science Ltd and IIR. All rights reserved. English ELSEVIER SCI LTD REFRIGERANT MIXTURES ALTERNATIVES EVAPORATION R-22 PURE Experimental investigation on the drop-in performance of R407C as a substitute for R22 in a screw chiller with shell-and-tube heat exchangers Article 10.1016/S0140-7007(01)00056-1 1 INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, v.25, no.5, pp.575 - 585 INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 25 5 575 585 scie scopus 000177209800011 2-s2.0-0036679898 Thermodynamics Engineering, Mechanical Thermodynamics Engineering Article REFRIGERANT MIXTURES ALTERNATIVES EVAPORATION R-22 PURE water chiller screw compressor refrigerant R22 substitute R407C drop-in performance measurement