超长连接管多联机性能衰减试验研究

Experimental research on performance degradation of multi-connected air-condition(heat pump) unit with extra long pipe

多联机属于直接膨胀式系统,具有换热效率高、室内控制灵活等特点。但是由于多联机依赖庞大的连接管网络直接输送制冷剂至被空调区域,其性能受安装方式、位置、服务区域半径等因素的影响,导致能力、能效产生衰减。本文通过在焓差试验室实际测试,研究一套额定制冷/热量为15.5/18.0kW的多联机在超长连接管下的实际性能,相关数据可以为多联机工程设计提供参考。

Multi-connected air-condition（heat pump）unit is one kind of direct expan- sion air-conditioning system with high heat exchange efficiency, easy control of terminal units. Depending on extensive connecting pipe to supply refrigerant to individual space for cooling or heating, the performance of multi-connected air-condition（heat pump）unit is af- fected by installation, location, air-conditioning zone radius, etc. and the performance degradation is inevitable. One set of multi-connected air-condition（heat pump）unit with extra long pipe whose nominal cooling/heating capacity is 15.5/18.0 kW, is tested in en- thalpy difference laboratory, and the corresponding experimental results can provide refer- ences for multi-connected air-condition（heat pump）unit engineering design.