Control method and system of frequency-conversion solar heat pump water heater

Abstract

The invention discloses a control method and system of a frequency-conversion solar heat pump water heater. The control method comprises the following steps that system operation parameters are initialized, specifically, (11) the initial optimal operation time Time0 and the initial average heating power Qh0 are obtained according to the initial solar irradiation intensity value E0 and the initialenvironment temperature Te0; and (12) the initial operation frequency f0 of a compressor and the initial open degree EXV0 of an electronic expansion valve are calculated according to the initial average heating power Qh0, the system operates according to the initial operation frequency f0 of the compressor and the initial open degree EXV0 of the electronic expansion valve, and the operation frequency of the compressor and the open degree of the electronic expansion valve are adjusted periodically in the system operation process. According to the control method, heat absorption of an evaporatoris increased through solar radiation heat, the instability of the solar radiation heat is made up through air heat, and double sources of solar energy and air energy are integrated to achieve the purpose of improving the performance of a solar water heater system.

Description

technical field [0001] The invention relates to the technical field of solar heat pumps, in particular to a control method and system for frequency conversion solar heat pumps. Background technique [0002] The solar heat pump system replaces the original heat pump outdoor unit with a direct expansion evaporator. The evaporator can not only absorb solar radiation heat but also exchange heat with the air. The problems faced by the existing direct expansion solar heat pump are 1. Due to different Weather changes and day and night changes lead to changes in solar radiation, but the current solar heat pump system only controls the opening of the electronic expansion valve and the compressor according to the difference between the ambient temperature or the set temperature of the water tank and the actual temperature according to the traditional control method of the heat pump system. Running, resulting in the inability to adapt to the change of heat exchange caused by the change...

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Problems solved by technology

[0003] The present invention aims to solve the problem that the existing solar heat pump system controls the opening of the electronic expansion valve and the operation of the compressor according to the difference between the ambient temperature or the set temperature of the water tank and the actual temperature, resulting in the inability to adapt to the change of heat transfer caused by the change of solar radiation. , the technical problem of not being able to maximize the use of solar radiation energy, a control method for variable frequency solar heat pump water heaters is proposed, which can solve the above problems

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