SGCHPS土壤热平衡及系统热量利用

Soil heat balance and heat utilization of system for SGCHPS

摘要:

为解决严寒地区建筑物热负荷远大于冷负荷而导致的太阳能-土壤源热泵系统(SGCHPS)供热性能逐年下降、以至于无法使用的问题,提出依靠太阳能季节性土壤蓄热来维持土壤热平衡、提高系统效率的方法.以严寒地区太阳能-土壤源热泵供热供冷示范工程为平台,进行了为期3 a的蓄热、供热、供冷长期实验.实验结果表明:在保证供热供冷效果的基础上,土壤温度呈现日周期和年周期变化,土壤保持了以年为周期的热平衡;太阳能在冬季供热量中占85%;在供冷季同时进行蓄热和供冷的2组土壤换热器(GHE)可根据换热功率分配其比例.土壤蓄热解决了严寒地区建筑物冷热负荷不平衡的问题,使系统能长期高效运行,并实现了全年太阳能的利用,节约了大量的常规能源.

Abstract:

In severe cold zone,building’s heating load is much bigger than cooling load.Heating performance of solar-ground coupled heat pump system(SGCHPS) declines year after year and even can’t afford the heating load.In order to solve this problem,a method of depending on solar seasonal heat storage in soil was put forward to maintain soil heat balance and increase system efficiency.Relying on a demonstration project of solar-ground coupled heat pump for heating and cooling in severe cold zone,long-term experiment on heat storage,heating and cooling of 3 years was carried out.On the basis of ensuring heating and cooling effect,the experimental results showed that the soil temperature changed daily and annually.And the soil maintained heat balance in an annual cycle.Solar energy accounted for 85% of the total heat supply in winter.In the cooling season,the ratio of ground heat exchanger(GHE) for heat storage and cooling can be distributed according to heat transfer rates.Heat storage in soil solved the imbalance of heating and cooling loads in severe cold zone.The system could operate efficiently for a long period.Solar energy of the whole year was utilized,which saved a lot of conventional energy.