Evaporative Condensation Air-Conditioning Unit with Microchannel Heat Exchanger: An Experimental Study

Junjie Chu, Xiang Huang (), Hongxu Chu, Liu Yang, Weihua Lv, Xing Tang and Jinxing Tian
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Junjie Chu: School of Urban Planning and Municipal Engineering, Xi’an Polytechnic University, Xi’an 710048, China
Xiang Huang: School of Urban Planning and Municipal Engineering, Xi’an Polytechnic University, Xi’an 710048, China
Hongxu Chu: College of Environment and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
Liu Yang: School of Urban Planning and Municipal Engineering, Xi’an Polytechnic University, Xi’an 710048, China
Weihua Lv: State Key Laboratory of Building Safety and Built Environment, Beijing 100013, China
Xing Tang: LUE-ON (Jiangsu) Environmental System Co., Ltd., Taizhou 225400, China
Jinxing Tian: School of Urban Planning and Municipal Engineering, Xi’an Polytechnic University, Xi’an 710048, China

Energies, 2025, vol. 18, issue 9, 1-18

Abstract: A new evaporative condensation refrigerant pump heat pipe air-conditioning unit based on a microchannel heat pipe heat exchanger is proposed. Performance experiments were conducted on the unit, and the experimental results show that the cooling capacity of the unit in the dry, wet, and mixed modes can reach 112.1, 105.8, and 115.4 kW, respectively, the optimal airflow ratio of the secondary/primary airflow is 2.2, 1.8, and 1.8, respectively, and the EER decreases with increasing airflow ratio. With increasing dry- and wet-bulb temperatures of the secondary-side inlet air, the cooling capacity and energy efficiency ratio of the unit decrease, and the energy efficiency ratio in the wet mode is higher than that in the dry mode, which can prolong the operating hours of the wet mode within the operating temperature range of the dry mode and improve the energy efficiency of the unit. A new calculation method for the refrigerant charge is proposed, and the optimal refrigerant charge is 32 kg based on the experimental results, which agrees with the theoretical calculation results.

Keywords: evaporative cooling; evaporative condensation; refrigerant pump system; heat pipe; refrigerant charging (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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