Theoretical and numerical study on performance of the air-source heat pump system in Tibet

RENEWABLE ENERGY

卷:114

Article

Li, Yongcai¹  Li, Wuyan¹  Liu, Zongsheng¹  Lu, Jun¹  Zeng, Liyue¹  Yang, Lulu¹  Xie, Ling¹ 

[1] Chongqing Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Minist Educ, Chongqing 400045, Peoples R China

关键词: Air source heat pump;    Atmospheric pressure;    Ambient temperature;    Frosting problem;    COP;    Heating capacity;   

DOI  :  10.1016/j.renene.2017.07.036

来源: Elsevier

【 摘 要 】

Air source heat pump (ASHP) technology is widely accepted for the merits of energy-saving and environmental protection, and has been served as the heating and cooling source in most part of China. This paper presents a numerical model to predict the performance of a typical ASHP system in Lhasa, the capital of Tibet Autonomous Region of China. The theoretical analysis shows that the occurrence of the frost is hard to be found on air-side heat exchanger due to the low relative humidity, which can improve the performance of the ASHP system. The numerical results show that the ambient air temperature and atmospheric pressure have a great effect on the system performance. For the case of without considering frosting problem, the COP of the system is reduced by 9.5%-12.5% than that for standard pressure (101.325 kPa). The heating capacity of the system is reduced by 16.2%-19.8% than that for standard pressure. For the case of considering frosting problem, the heating capacity and COP of the ASHP system in Lhasa are 37.5 kW and 1.98, respectively under the outdoor design temperature, which are almost same or higher than most cities in this study. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free