Optimization of evaporator structure in a direct expansion solar heat pump

ZHOU Beiyan; HUANG Xinghua; HOU Xiaohan

doi:10.12299/jsues.24-0158

Volume 39 Issue 3

Sep. 2025

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ZHOU Beiyan, HUANG Xinghua, HOU Xiaohan. Optimization of evaporator structure in a direct expansion solar heat pump[J]. Journal of Shanghai University of Engineering Science, 2025, 39(3): 292-299. doi: 10.12299/jsues.24-0158

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ZHOU Beiyan, HUANG Xinghua, HOU Xiaohan. Optimization of evaporator structure in a direct expansion solar heat pump[J]. Journal of Shanghai University of Engineering Science, 2025, 39(3): 292-299. doi: 10.12299/jsues.24-0158

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Optimization of evaporator structure in a direct expansion solar heat pump

doi: 10.12299/jsues.24-0158

School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

Received Date: 2024-06-02
Available Online: 2025-12-22
Publish Date: 2025-09-30

Abstract

Abstract

The optimization of the collector/evaporator structure in a direct-expansion solar heat pump system was investigated. A distributed parameter numerical model for a roll-bond collector/evaporator was developed and validated against experimental data. The effects of the path tube number arrangement and tube spacing on the collector/evaporator collector efficiency and the coefficient of performance (COP) of the heat pump system were simulated and analyzed. The results indicate that, for a given total number of tubes, a larger tube number ratio between the first and second paths can lead to a lower total refrigerant pressure drop and a higher evaporation temperature. The optimal heat collection efficiency and COP are achieved when the tube number ratio is 1∶1. Furthermore, as the tube spacing increases, both the heat collection efficiency and COP first increase and then decrease, reaching their maximum values at a tube spacing of 0.04 m.
- solar energy,
- collector/evaporator,
- tube spacing,
- path arrangement,
- numerical simulation

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References(16)

References

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