寒冷地区地源热泵系统冬季运行特性分析

Analysis on operation characteristics of ground source heat pump system in cold area in winter

针对地源热泵系统长期运行产生土壤热堆积问题,本论文以泰安市某办公楼地源热泵系统为例,通过对该系统连续三年的冬季运行特性进行研究,得出以下结论:2015年至2017年地源侧出水温度总体上升约0.15℃,负荷侧出水温度整体上升约0.59℃,利于冬季机组运行;室外温度在小于-1.5℃和大于0.5℃的变化范围内时,机组COP和系统COP'波动较小;当室外温度在-1.5~0.5℃之间时,机组COP和系统COP'呈先下降后上升趋势,但值仍在3~5之间,属于规范要求范围。为使机组冬夏季都能保持高效运行,应采用分区运行或间歇运行方式。

Aiming at the problem of soil thermal accumulation in the long - term operation of ground source heat pump system, a source heat pump system of an office building in Tai＇an was taken as the research object. By analyzing the winter operating characteristics of the system for three consecutive years, it is concluded as follow ： the temperature of the source side water increases by about 0.15℃ and the load side water temperature rises about 0.59℃ from 2015 to 2017, it is benefit to the unit to run in winter. When the outdoor temperature is within the range of lower than - 1.5℃ and greater than 0.5℃, the unit COP and the system COP＇ fluctuate less. When the outdoor temperature is between - 1.5℃ to 0.5℃, the unit COP and the system COP＇first decline after the upward trend, but the COP values are still between 3 to 5, within the scope of regulatory requirements. In order to make the unit be able to maintain efficient operation in winter and summer, the partition or intermittent operation should be used.