基于制冷剂毛细管地板供热的空气源热泵运行实验研究

Experimental Study on Operation Characteristics of Air Source Heat Pump System Based on Refrigerant Capillary Floor Heating

本文对应用于实际项目的新型制冷剂毛细管地板供热的空气源热泵系统进行了运行实验测试。该热泵系统冬季运行时,利用敷设于地板中的制冷剂毛细管辐射末端供热,制冷剂在毛细管中冷却冷凝放热。通过现场测试,分析了该地板辐射末端供热时的室内环境特性,以及空气源热泵系统的运行特性。测试结果表明,供热时地表温度在25~34℃范围内,在供热量较大时地板表面温度会高于相关标准要求。室内空气温度在部分时间段超出室内设定值。由于系统间歇运行,在启停阶段需要考虑地板本身蓄放热的影响。此外,基于地板的蓄热特性,机组除霜阶段室内温度稳定、不受影响。在室内设定温度为24℃、22℃工况时,系统稳定运行阶段的平均COP分别为2.52、2.92,全天COP平均值则为3.38与3.5。测试还发现,在供入地板的制冷剂分歧管附近,受制冷剂过热段的影响,产生局部地板温度超高等问题。通过现场测试,对系统的实际运行状态进行了分析,对存在的问题等提出了后续研究的关注点。

In this paper, the experimental study on air source heat pump system(ASHPS) using refrigerant capillary y floor heating was conducted. When the ASHPS operated in winter, the refrigerant capillary pipes buried in the floor was used as condenser. Based on the field test in an actual building, the indoor environmental characteristics of the radiant floor heating and the operational characteristics of the ASHPS were analyzed. The results showed that the surface temperature of floor was within the range of 25 ℃ to 34 ℃, and the surface temperature of floor was higher than the limited values in relevant standards when the heating load was high. Besides, the indoor air temperature exceeded the set value in some periods. Due to the intermittent operation of the system, the heat storage and discharge of the floor itself need to be considered during the start-up and shutdown. What’s more, based on the heat storage characteristics of the floor, the indoor temperature remained stable and unaffected during the defrosting stage. For the 24 ℃ condition, the average COP in the stable stage was 2.52, and it increased to 2.92 at 22 ℃ condition. The mean COP in the whole day was 3.38 and 3.5 for the two temperature conditions respectively. In the test, it was found that the surface temperature of floor at the manifold area with discharge pipe was much higher. Through the field test, the actual operation of the ASHPS based on refrigerant capillary floor heating was analyzed, and the focus of follow-up research on the existing problems was put forward.