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北方城镇采暖能耗巨大,传统采暖方式能效低污染大。地源热泵长年运行会导致土壤温度逐年下降和机组性能的大幅衰减。本文提出了地源吸收式热泵供热与采暖末端免费供冷相结合的供热系统,以缓解土壤热不平衡问题。用TRNSYS模拟了地源吸收式热泵系统单纯供热和结合采暖末端供冷后的土壤温度变化,并与传统地源热泵系统进行了对比。结果表明地源吸收式热泵运行十年后土壤温度由15℃降到9℃左右,加上免费供冷后土壤的温度降幅不到2℃。北京典型住宅采用暖气片供冷后,室内能达到7℃左右的降温效果,基本都能维持在29℃以下,且相当一部分时间内低于26℃。而在沈阳室内基本都可以控制在20～26℃。地源吸收式热泵供热结合采暖末端供冷不仅能够较好缓解寒冷地区土壤热不平衡,还能较好提高室内舒适性。
Heating energy consumption in northern cities is huge, and traditional heating methods have low energy consumption and big pollution. Long-term operation of ground source heat pumps can lead to a year-to-year decrease in soil temperature and a substantial decrease in unit performance. In this paper, a heat supply system combining ground-sourced absorption heat pump heating with free-cooling heating at the end is proposed to alleviate the problem of soil thermal imbalance. Using TRNSYS to simulate the ground source absorption heat pump system simply heating and combined with the heating end of the soil temperature changes after cooling, and compared with the traditional ground source heat pump system. The results show that after 10 years of operation, ground-source heat pump can reduce soil temperature from 15 ℃ to 9 ℃, and the temperature of soil decreases by less than 2 ℃ after free cooling. Beijing typical residential heating radiators cooling, the indoor cooling effect can reach about 7 ℃, the basic can be maintained below 29 ℃, and a considerable part of the time less than 26 ℃. In Shenyang indoor basically can be controlled at 20 ~ 26 ℃. Ground source absorption heat pump heating combined with the heating of the terminal cooling not only can better alleviate soil heat imbalance in cold areas, but also better improve indoor comfort.