Flow path system of heat pump unit, heat pump unit and control method of heat pump unit

Abstract

The invention provides a flow path system of a heat pump unit, the heat pump unit and a control method of the heat pump unit. The flow path system comprises a refrigerant loop, a heating loop and a heat storage loop, wherein the refrigerant loop comprises an outer unit and a heat exchange element; the heating loop is formed by connecting a water pump and the heat exchange element in series; the heat storage loop is formed by connecting a heat storage device and the outer unit in series, and the heat storage device is connected with the heat exchange element in parallel; a first solenoid valve controlling on-off of the heat storage loop is arranged on the heat storage loop; the heating loop comprises a heating branch penetrating the heat storage device, and a second solenoid valve controlling on-off of the heating branch is arranged on the heating branch; the flow path system further comprises a controller connected with the first solenoid valve and the second solenoid valve; the controller controls the first solenoid valve to be opened to enable the heat storage device to store heat, and the operating time of the outer unit is prolonged; after the outer unit shuts down, the controller controls the second solenoid valve to be opened to enable the heat storage device to release heat, the interval time until next start of the outer unit is prolonged, the frequency of temperature-reaching start and stop of the outer unit is reduced, and the stability of temperature of supplied water is guaranteed.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to a flow path system of a heat pump unit, a heat pump unit and a control method thereof. Background technique [0002] As people's awareness of improving the quality of life continues to increase, more and more people will choose to use floor heating for heating in winter. For a fixed-speed air-cooled hot and cold water heat pump unit, when working under a small load (such as an outdoor ambient temperature of about 10°C), the outlet water temperature will soon reach the preset value, and the compressor will continue to start and stop, resulting in a decrease in the supply water temperature. The fluctuation is large, and the indoor temperature cannot reach a more comfortable temperature for a long time. Contents of the invention [0003] The main purpose of the present invention is to provide a flow path system of a heat pump unit, aiming at solving the technical problem th...

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a flow path system of a heat pump unit, aiming to solve the technical problem of frequent start and stop of a fixed-speed air-cooled hot and cold water heat pump unit under small load conditions, resulting in large fluctuations in water supply temperature

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