LAUSR

Received: 10 October 2019 Accepted: 17 December 2019 This paper aims to study the winter heating performance of the air source heat pump (ASHP) system in cold regions. To this end, a winter operation performance test platform of the ASHP was built in an office building of a university in Zhangjiakou area. In the heating season of 2017-2018, the field test on performance parameters such as heating capacity and power consumption of the ASHP system were conducted. The results showed that the ASHP system used in the test can operate normally in extremely cold weather conditions in Zhangjiakou area; the indoor temperature during the ASHP operation meets the winter heating requirements; the coefficient of performance (COP) during the deep cold period was between 1.32 and 3.29; with the outdoor temperature reduced, the heat pump defrosting and oil return process is one of the main factors for energy consumption increase; when the outdoor temperature is high, 10-hour operating mode can save more power compared to the full-day operation; when the outdoor temperature is low, it does not necessarily save more. The research findings provide a valuable reference for the application and improvement of the ASHPs in cold regions.