供暖室外计算温度下空气源热泵容量选型研究

Capacity selection of air-source heat pump based on outdoor design temperature for heating

给出了制热量衰减系数和结霜损失系数计算式,对制热工况下的空气源热泵模型进行了修正。以严寒和寒冷地区11个典型城市为例,探讨了基于供暖室外计算温度选型的空气源热泵供暖时,室外环境温度和结霜对热量供需平衡关系、供暖室内最低温度及不保证天数的影响。结果表明,室外环境温度过低和结霜会导致空气源热泵制热量低于建筑热负荷,从而导致建筑室内温度偏低,不保证天数延长,而且结霜对基于供暖室外计算温度选型的空气源热泵供暖效果的影响更显著。建议在基于供暖室外计算温度选型容量的基础上乘以一个修正系数,严寒B区和C区修正系数分别取1.00和1.05,寒冷地区取1.15~1.30。

The calculation formulas of heat attenuation coefficient and frosting loss coefficient are given, and the model of air-source heat pump under heating condition is modified.Taking 11 typical cities in cold and severe cold zones as examples, this paper discusses the influences of outdoor ambient temperature and frosting on the balance relationship between heat supply and demand, the lowest temperature in the heating room and the unguaranteed days when the air-source heat pump is selected based on the outdoor design temperature for heating. The results show that both low outdoor ambient temperature and frosting will make the heating capacity of air-source heat pump lower than the building heating load, leading to lower indoor temperature and extension of unguaranteed days. Moreover, frosting has a more significant effect on the heating effect of air-source heat pumps selected based on outdoor design temperature for heating. It is recommended to multiply a correction coefficient on the basis of the original selection capacity based on the outdoor design temperature for heating, the correction coefficient can be 1.00 and 1.05 in the severe cold zone B and C, respectively, and between 1.15 and 1.30 in cold zones.