Kharakteristiki spiral'nykh kompressorov dlya primeneniya v nizkotemperaturnykh vozdushnykh teplovykh nasosakh

Ceteris paribus the efficiency of heat pumps is higher in the systems with moderate temperature levels for heat consumers. Lowtemperature systems for heating and hot water supply are considered the most promising. The lowtemperature airwater heat pumps consist of a circuit, through which a refrigerant circulates, an evaporator, a condenser and a compressor. The selection of a scroll compressor for a lowtemperature heat pump is defined by its operating characteristics which include isentropic efficiency, feed coefficient and compression ratio. To demonstrate/prove the manufacturer’s specifications for scroll compressors the authors investigated the compressors of three manufacturers Copeland, Danfoss and Invotech: lowtemperature compressors ZF15K4TTFD, LLZ015T4A, YF35E1G100 and mediumtemperature ones ZB29KCETFD, MLZ030T4 and YM70E1G100. The study of lowtemperature compressors was carried out in the range of refrigerant boiling temperatures from minus 10 to minus 40 оС, medium temperature scroll compressors in the range from 0 to minus 30 оС. The dependences of the isentropic efficiency and the feed ratio of a scroll compressor on the compression ratio were defined. The data obtained allowed plotting diagrams of respective dependences for various compressor models.

воздушный тепловой насос, спиральный компрессор, изоэнтропный (адиабатный) КПД, коэффициент подачи, степень сжатия компрессора