埋管设计对寒冷地区地埋管地源热泵系统性能的影响
Effects of buried pipe design parameters on performance of ground-source heat pump systems in cold zone
摘要：
基于动态系统仿真软件TRNSYS开发了地埋管地源热泵系统性能预测软件。以山西省贺职地区一个铁路站房的地埋管地源热泵系统为例，利用该软件计算分析了埋管间距和埋管深度对地埋管地源热泵系统长期运行性能的影响。结果表明：不采用补热措施时，地埋管地源热泵系统在寒冷地区长期运行将导致土壤温度持续降低且无法自主恢复，热泵机组的制热量和COP持续降低，室温不保证时间逐渐增加。增大埋管间距和埋管深度可延缓土壤平均温度和系统供热性能的下降，但不能遏止地埋管地源热泵系统性能的衰减。
Abstract：
Based on the dynamic simulation software TRNSYS, develops a software to predict the performance of ground-source heat pump (GSHP) systems. Taking the GSHP system in Hezhi railway station of Shanxi province as an example, investigates the effects of buried pipe space and depth on long-term performance of the GSHP system. The results show that the long-term operation of the GSHP system without heat compensation measures in cold zone will gradually decrease the heating capacity and COP of the heat pump unit due to the irreversible decrease of the average soil temperature and increase the unguaranteed hours of heating. Increasing the buried pipe space and depth can decrease the deterioration speed of the average soil temperature and the heating performance of the GSHP system, but can not finally prevent the decrease of system performance.
Keywords:ground-source heat pump, thermal unbalance, buried pipe space, buried pipe depth, system performance, simulation, cold zone