A multi-connected heat pump system with high-efficiency heat recovery and its control method

Abstract

The invention provides a multi-split heat pump system achieving efficient heat recovery and a control method of the multi-split heat pump system achieving efficient heat recovery. The multi-split heatpump system achieving efficient heat recovery comprises an evaporator, a condenser, a first variable-frequency compressor, a second variable-frequency compressor, a four-way valve, a multi-split indoor unit, an outdoor heat exchanger, a water tank, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve and a fifth electromagnetic valve, and all the components constitute a plate type heat recovery module and a heat pump heat recovery module of the system. By the adoption of the multi-split heat pump system achieving efficient heat recovery, in the refrigeration process of the heat pump system, heat generated during refrigeration of heat pumps is effectively used for heating water, so that heat recovery is achieved; besides, a water heating system can stably conduct heating at different indoor temperatures; and therefore the multi-split heat pump system achieving efficient heat recovery has the advantages of reducingenergy consumption, being simple and reliable in structure and convenient to maintain and the like.

Description

technical field [0001] The invention relates to the technical field of heat pump systems, in particular to a multi-connected heat pump system with high-efficiency heat recovery 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 the cooling is directly discharged to cause energy waste. Currently, the hot water system is directly connected in parallel or in series to the heat pump system, and the heat generated during the cooling process of the heat pump system can be used in the heat. The water system is heated by a heat exchanger to produce hot water, but the disadvantages are: first, the 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, but when it is independently refrigerated, since the heat in the whole process is directly discharged to the outside through the outdoor unit placed outdoors, not only The energy consumption of the outdoor fan is increased, and the heat generated by the cooling is directly discharged to cause energy waste. Currently, the hot water system is directly connected in parallel or in series to the heat pump system, and the heat generated during the cooling process of the heat pump system can be used in the heat pump system. The water system is heated by a heat exchanger to produce hot water, but the disadvantages are: first, the heat pump system will change the internal condensing agent flow rate according to the outdoor ambient temperature, and the direct connection between the water heating system and the heat pump system will be limited by the condensation pressure , the temperature of the hot water produced is not high, which cannot meet people’s needs; second, due to the large difference in working conditions between the heat pump system and the hot water system, the speed of production is slow, and the two need to be effectively integrated so that Can quickly produce hot water temperature that meets people's requirements under different outdoor temperatures

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