吸收式热泵区域供热最大供热范围与节能判据研究

在国家建筑节能设计标准中的耗电输热比EHR的基础上,结合一次能耗率引申得到一次能源消耗输热比PEHR的能耗比较标准,并根据对吸收式热泵区域供热系统PEHR指标的控制要求,得到了系统的最大作用范围,推导计算了吸收式热泵区域供热系统比传统的锅炉房区域供热系统节能时,热泵机组制热性能系数的下限值表达式。结果表明,当吸收式热泵制热性能系数一定时,PEHR控制值越大,吸收式热泵的作用范围越大;a值越大,系统的供热范围越小。吸收式热泵的制热系数的下限值不仅随锅炉热效率的提高而升高,而且随区域供热作用范围的增加而增大,因而小规模的吸收式热泵区域供热系统有利于系统节能的体现。

Study of reasonable heating range and energy saving criterion of absorption heat pump district heating system

On the basis of the ratio of electricity consumption to transferred heat quantity(EHR),combined with primary energy consumption rate and propagated in the national building energy efficiency design standard,the index of primary energy consumption ratio of heating supplied(PEHR) is established.According to the requirements of PEHR control index of the absorption heat pump district heating system,the maximum heating range is obtained.The lower limit heating coefficient of the heat pump unit expression is deduced when the absorption heat pump district heating system is more energy-saving than traditional boiler heating system.The results show that when the coefficient of the absorption heat pump is certain,the greater the PEHR control value,the more extensive the reasonable heating range;the larger the area value,the smaller the reasonable heating range.The lower limit of heating coefficient of the absorption heat pump not only increases with the improvement of the thermal efficiency of the boiler,but increases with the increase in the scope of the district heating range.Therefore the small-scale absorption heat pump district heating system is benefit for energy-saving.