Abstract
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.
Original language | English |
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Pages (from-to) | 575-585 |
Number of pages | 11 |
Journal | International Journal of Refrigeration |
Volume | 25 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2002 Aug |
Bibliographical note
Funding Information:The authors would like to thank the Ministry of Science and Technology, South Korea, for the financial support by a grant from the Critical Technology 21 Project.
Keywords
- Drop-in
- Measurement
- Performance
- R22
- R407C
- Refrigerant
- Screw compressor
- Substitute
- Water chiller
ASJC Scopus subject areas
- Building and Construction
- Mechanical Engineering