严寒地区某办公建筑空气源热泵系统供暖季运行性能分析

Analysis on Operation Performance of Air Source Heat Pump System in an Office Building in Severe Cold Area during Heating Season

空气源热泵作为清洁能源应用的重要组成部分,在我国北方地区大范围推广使用,由于严寒和寒冷地区室外温度过低,低温空气源热泵在实际运行中出现性能系数过低、机组和水泵耗电量偏大等问题。本文针对严寒地区某办公建筑空气源热泵供暖季进行长期监测,分析热泵实际运行特性和系统性能,探究空气源热泵实际运行效果偏低的原因,实测分析表明,热泵供回水平均温度为32.98℃和30.26℃,室温保证率为84%,经贡献率修正指数heat修正后为75%,热泵机组COP为1.55;机组启停频繁、热泵输配系统能耗过高以及机组制热量和建筑瞬时负荷不匹配均为性能系数偏低的关键因素。

As an important part of clean energy application, air source heat pump is widely recommended in northern China. Due to the low outdoor temperature in cold and severe cold regions, such questions as too low COP and fairly high power consumption of units and pumps appear during the actual operation of low temperature air source heat pump. Taking the air source heat pump of an office building during the heating season in severe cold area, this paper analyzes the actual operating characteristics and system performance of the heat pump, and explores the reason why the actual operation of the air source heat pump is too low. The measured analysis shows that the average temperature of the heat pump supply and return water is 32.98 ℃ and 30.26℃, the room temperature guarantee rate is 84%, the contribution rate correction index βheat is corrected to 75%, the heat pump unit COP is 1.55. Frequent start and stop of units, excessive energy consumption of heat pump transmis-sion and distribution system and mismatch of unit heat and building instantaneous load are the key factors of low COP.