Different modes of seasonal soil cold storage in Harbin

Abstract:

To reduce the energy consumption of air-conditioning in summer and the initial investment of ground source heat pump,a novel seasonal soil cold storage system with natural energy is presented,and the transient heat transfer models of vertical U-tube and outdoor air exchanger are developed.The operating process of this system in Harbin is calculated using the sensitive heat capacity model.Five cold-storing modes are studied,and the cold-storing capacity,preliminary cold-storing time,cold-extracting capacity,cold-extracting temperature,COP and soil temperature field around tube under different modes are obtained.Simulation results show that the COP of system changes from 9.92 to 14.15,which indicates the notable energy-saving effect.The cold-extracting temperature and cold-extracting capacity can satisfy the needs of air-condition,and it is proved to be feasible for the application of the presented system in the cold area.