A temperature-controlled multi-connection heat pump system with heat recovery function and its control method

Abstract

A temperature-controlled multi-connection heat pump system with heat recovery function and a control method provided by the present invention include a multi-connection heat pump refrigeration system and a water tank, a first solenoid valve, a second solenoid valve, a third solenoid valve, and a fourth solenoid valve. Valve, the fifth solenoid valve and the sixth solenoid valve, the electric control box and the first electronic expansion valve, the above components constitute the heat pump heat recovery module and the auxiliary heat exchange module of the system. The refrigerant flow path not only effectively uses the heat in the heat pump refrigeration to heat water to achieve heat recovery, but also solves the problem that the current multi-connected heat pump system is difficult to control to increase the supercooling of the liquid pipe, the superheat of the return air port of the compressor and reduce the electronic control module. temperature problem.

Description

technical field [0001] The invention relates to the technical field of heat pump systems, in particular to a temperature-controlled multi-connection heat pump system with heat recovery function and a control method. Background technique [0002] The multi-connected heat pump system is widely used due to its flexible control method and simple installation method. However, when it is independently refrigerated, the heat generated in the whole process is directly discharged to the outside through the outdoor unit placed outside. In this way, not only The energy consumption of the outdoor fan is increased, and the heat generated by refrigeration is directly discharged to cause energy waste. In addition, the high temperature of the electronic control module of the multi-connected system limits the scope of use of the compressor. At present, most of the electronic control modules of the multi-connected system The module is cooled by fans or refrigerants. This way is to transfer he...

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Problems solved by technology

[0002] The multi-connected heat pump system is widely used due to its flexible control method and simple installation method. However, when it is independently refrigerated, the heat generated in the whole process is directly discharged to the outside through the outdoor unit placed outside. In this way, not only The energy consumption of the outdoor fan is increased, and the heat generated by refrigeration is directly discharged to cause energy waste. In addition, the high temperature of the electronic control module of the multi-connected system limits the scope of use of the compressor. At present, most of the electronic control modules of the multi-connected system The module is cooled by fans or refrigerants. This way is to transfer heat to the system. In the gas-liquid separator, due to the insufficient superheat of the compressor, the supercooling of the multi-line is generally performed by the external condenser. To increase the subcooling degree, more condenser area needs to be wasted, causing more cost to the external unit. In addition, if the return air temperature of the compressor is low at low temperature, it is easy to cause the phenomenon of compressor liquid return. The usual practice is Electrically heating the compressor not only wastes energy, but also causes problems such as low energy efficiency of the heat pump system and poor cooling effect

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