哈尔滨季节性土壤蓄冷不同蓄冷模式

Different modes of seasonal soil cold storage in Harbin

摘要:

为降低夏季空调能耗,减少土壤源热泵系统初投资,提出自然冷源季节性土壤蓄冷系统,建立季节性土壤蓄冷垂直U型埋管和室外空气换热器的非稳态传热模型.引入显热容模型对哈尔滨地区系统的运行特性进行模拟计算,研究5种不同蓄冷模式,得出不同模式下系统的蓄冷量、预蓄冷时间、释冷量、释冷温度、COP值以及埋管周围土壤的温度场.模拟结果显示系统的COP值在9.92～14.15,节能效果显著,释冷温度和释冷量可满足空调需要,证明该系统应用于严寒地区是可行的.

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.