Variable-frequency solar heat-pump water heater control method and system

Abstract

The invention discloses a variable-frequency solar heat-pump water heater control method and system, and the method comprises the following steps: a system operation parameter initialization step: (11), obtaining the initial optimal operation time and the initial average heating power according to an initial solar irradiation intensity value and an initial environment temperature; (12), calculating an initial operation frequency of a compressor and an initial opening degree of an electronic expansion valve according to the initial average heating power; operating the system according to the initial operation frequency of the compressor and the initial opening degree of the electronic expansion valve, periodically adjusting the operation frequency of the compressor in the system operation process, and adjusting the opening degree of the electronic expansion valve according to a suction superheat degree of the compressor. According to the method, the heat absorption of an evaporator is improved by utilizing solar radiation heat, and the instability of the solar radiation heat is compensated by utilizing air heat, so that the aim of improving the performance of the solar water heatersystem is fulfilled by integrating solar energy and air energy.

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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