Control method of complex heat pump

Abstract

Disclosed herein is a control method for a multiple heat pump. In the control method, when one of multiple indoor units operates in the heating mode and the other indoor units shut down, electronic expansion valves of the shutdown indoor units are controlled to have an opening degree higher than a standard opening degree if an outlet temperature of compressors is higher than a preset temperature, so as to permit a liquid refrigerant, remaining in the shutdown indoor units, to be more readily recovered to the compressors. This eliminates a refrigerant shortage phenomenon of the compressors and prevents deterioration of heating performance as well as reduction of life-span of the compressors.

Description

technical field [0001] The present invention relates to a multiple heat pump, and more particularly to a control method of the multiple heat pump, which can make the heat pump remaining in the stopped operation when only one of the multiple indoor units operates in the heating mode. Liquid refrigerant in the indoor unit returns to the compressor. Background technique [0002] Fig. 1 shows a schematic diagram of the cycle of refrigerant flow in the cooling mode of a conventional compound heat pump. Fig. 2 shows a schematic diagram of the cycle of refrigerant flow in the heating mode of a conventional compound heat pump. Fig. 3 shows a schematic diagram of the cycle of refrigerant flow when one indoor unit among the indoor units of a conventional compound heat pump operates in a heating mode and the other indoor units stop operating. [0003] As shown in FIGS. 1 to 3 , a conventional complex heat pump includes a plurality of indoor units 1 , 2 , 3 and 4 . Each indoor unit 1...

AI Technical Summary

Problems solved by technology

This fact means that the amount of refrigerant circulated to the compressor 22 is reduced, causing the cooling efficiency to decrease and the compressor 22 to overheat

Such overheating of the compressor 22 increases the temperature on the outlet side of the compressor, resulting in reduced heating performance, while damaging and shortening the life of the compressor 22

Images