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直膨式太阳能热泵(direct expansion solar assisted heat pump,DX-SAHP)可直接吸收利用太阳能,进而提高热泵的蒸发温度和性能系数(COP),有利于改善热泵的热性能和结霜。本文在带有太阳模拟发射器的焓差实验室中建立直膨式太阳能热泵和常规直彭热泵的对比实验,对不同条件下的热泵系统参数进行测量并进行性能对比和分析。实验结果显示,直膨式太阳能热泵能够吸收太阳能,在辐照度分别为100和200 W/m~2的工况下,系统制热功率比无辐照时的制热功率分别提高9.8%和21.8%,COP分别提高11.7%和23.7%,且除霜启动延迟23 min;辐照度为200 W/m~2时,直膨式太阳能热泵在环境温度5℃下的制热功率比1℃下的制热功率提高16.92%;在室外温度为1℃,相对湿度为95%的工况下,提高太阳辐照度,可有效减小涂层蒸发器进出口温度的波动,提高蒸发器运行的稳定性。此外,直膨式太阳能热泵在运行过程中吸收的太阳辐射被用来蒸发液态制冷剂工质,导致压缩机进气量增加,系统的制热功率和COP提高。
Direct expansion solar assisted heat pump (DX-SAHP) can directly absorb and utilize solar energy, thereby increasing the heat pump evaporation temperature and coefficient of performance (COP), which is beneficial to improve the heat pump performance and frost formation. In this paper, the enthalpy difference laboratory with a solar simulator was established direct-flow solar heat pump and conventional straight Peng heat pump comparison experiment, the heat pump system parameters under different conditions were measured and performance comparison and analysis. The experimental results show that the direct-expansion solar heat pump can absorb the solar energy, and the heating power of the system heating power is increased by 9.8% and that of the non-irradiation heating power respectively under the irradiation conditions of 100 and 200 W / m ~ 2 21.8% and COP of 11.7% and 23.7%, respectively, and the defrosting start-up delay is 23 min. When the irradiance is 200 W / m ~ 2, the heating power of direct expansion solar heat pump at ambient temperature 5 ℃ is 1 ℃ Under the heating power increased by 16.92%; in the outdoor temperature of 1 ℃, 95% relative humidity conditions, improve the solar irradiance, coating evaporator can effectively reduce the import and export of temperature fluctuations and improve the operation of the evaporator Stability. In addition, the solar radiation absorbed by the direct-expansion solar heat pump during operation is used to evaporate liquid refrigerant. As a result, the air intake of the compressor is increased and the heating power and COP of the system are increased.