Field test and modeling analysis on unbalance of heat extraction and rejection of GSHP systems with different AC terminal units

Abstract

Ground source heat pump, as renewable energy technologies, are increasingly appearing to provide the indoor thermal environment for residential buildings in Hot Summer and Cold Winter zone. However, it needs to be tested whether GSHP is proper to the Hot Summer and Cold Winter zone? From 2012-2017, comprehensive field test was carried for 8 GSHP systems of residential buildings in Hot Summer and Cold Winter zone. The field test focused on performance of GSHP and the heat balance of ground source, which is an important factor for the application of ground source heat pump systems. In this paper, the analysis results of the balance of ground source of the systems with different AC terminal units are different from each other. The main influence factors for the heat balance of ground source are performance of heat pump and heating/cooling demand of buildings. The results of field test reveal that there is little difference for COP of heat pump. The heating/cooling demand is different for different systems. The further investigation reveal that the occupant behavior of different AC terminal units may determine heating/cooling demand of system, which resulted in the difference of the heat balance for ground source. The paper proposed an integration model of building load simulation considering the occupant behavior and GSHP systems. A case study will be conducted to quantitative analyze for the influence of the occupant behavior of different AC terminal units on the balance of ground source.