Frequency conversion solar energy heat pump water heater control method and system

Abstract

The invention discloses a frequency conversion solar energy heat pump water heater control method and system. The frequency conversion solar energy heat pump water heater control method includes the following steps that system operation parameters are initialized, specifically, (11) according to an initial solar radiation intensity value E0 and the initial ambient temperature T<e>0, the initial optimal operating time Time0 and the initial average heating power Q<h>0 are obtained; (12) the initial running frequency f0 of a compressor and the initial opening degree EXV0 of an electronic expansion valve are calculated according to the initial average heating power Q<h>0; and a system is run according to the initial running frequency f0 of the compressor and the initial opening degree EXV0 ofthe electronic expansion valve, the running frequency of the compressor is periodically adjusted during system running, and the opening degree of the electronic expansion valve is adjusted according to the air suction superheat degree of the compressor. According to the frequency conversion solar energy heat pump water heater control method, absorption of heat of an evaporator is improved throughsolar energy radiation heat, then air heat is used for compensating the instability of the solar energy radiation heat, and thus two sources of solar energy air energy are combined into one to achievethe 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 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 of solar r...

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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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