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冷凝排风新风机组,也称为热泵式排风热回收新风机组,按结构分为整体式和分体式。分体式冷凝排风机组布置灵活,能满足不同客户的安装需求。然而,分体式冷凝排风机组室内外机之间的长连接管使得制冷剂充注量对机组性能的影响与整体式机组不同。实际生产中,为了加工的方便,同一型号的所有机组都充注相同质量的制冷剂,即不考虑工程应用时分体式机组中由膨胀阀安装位置和制冷剂连接管长度带来的制冷剂充注量影响,由此造成了机组性能的衰减。本文通过仿真结合实验,对分体式冷凝排风新风机组的制冷剂充注量进行优化,得出膨胀阀安装于室内侧的机组性能更好,为工程应用提供依据,并获得了综合制冷和制热工况下连接管长变化范围5 m~15 m的系统最佳制冷剂充注量,为实际生产提供有价值的普适性设计方法参考。
Condensing exhaust fresh air unit, also known as heat pump exhaust heat recovery fresh air unit, according to the structure is divided into integral and split. Split condensing exhaust unit flexible layout, to meet the installation needs of different customers. However, the long connecting pipe between the indoor unit and the outdoor unit of the split condensing exhaust unit makes the influence of the refrigerant charge on the unit performance different from that of the unit-integrated unit. In actual production, in order to facilitate the processing, all units of the same model are charged with the same quality of refrigerant, which does not consider the engineering application of the split unit by the installation position of the expansion valve and the length of the refrigerant connecting pipe refrigerant charge Amount of influence, resulting in decay of the unit performance. In this paper, through the simulation and experiment, the refrigerant charge of the fresh air unit of the split condensing and exhausting unit is optimized, the conclusion is drawn that the performance of the unit installed on the indoor side of the expansion valve is better and the basis for engineering application is obtained. The optimal refrigerant charge of the system with the pipe length varying from 5 m to 15 m under thermal conditions provides valuable universal design method reference for practical production.