Comparative Heating Performances of Ground Source and Air Source Heat Pump Systems for Residential Buildings in Shanghai

摘要

As the main heat sources/sinks of heat pump systems, the ambient air and ground may have different performance characteristics. In this study, the performance comparison of an Air Source Heat Pump (ASHP) and a vertical Ground Source Heat Pump (GSHP) for space heating is presented. Both systems were installed in a residential building in Shanghai, and the ASHP and GSHP were tested in a same room under the similar weather conditions. The performance of the ASHP system largely depends on the ambient conditions. Under the same outdoor air temperature conditions, the power consumptions of the ASHP on rainy days were higher than that on sunny days, and the COPs of the heat pump unit and the heat pump system on sunny days were higher than that on rainy days. During the heating season, the weighted average COPs of the ASHP unit and the heat pump system are 2.44 and 1.9, respectively. The seasonal average COPs of the GSHP unit and the heat pump system are 5.21 and 3.03, respectively. The experimental results indicate that the GSHP system was preferable to the ASHP system in terms of energy efficiency for space heating.