Control method and control system of heat-pump water heater

Abstract

The invention provides a control method and a control system of a heat-pump water heater. The control method comprises the steps that firstly, the current external environment temperature, detected by a temperature-sensing element, of a hot water unit is obtained; according to the current external environment temperature and a heating capacity curve, current heating capacity of the hot water unit is determined; according to the current heating capacity of the hot water unit, the maximum output water temperature is determined; then, according to the difference value between the actual output water temperature and the maximum output water temperature of the hot water unit, the opening degree of a warm water valve is correspondingly controlled so as to control water flow in a real-time manner, so that operating states of elements in the hot water unit are reasonably adjusted, the aims of stabilizing the exhaust pressure and the output water temperature of the hot water unit are achieved, and the service life of the hot water unit is prolonged.

Description

technical field [0001] The present invention relates to the technical field of heat pump water heaters, and more specifically, to a control method and control system for heat pump water heaters. Background technique [0002] There are certain changes in the heating capacity of heat pump water heaters under different ambient temperatures. When the ambient temperature is high, the heating capacity of heat pump water heaters will be significantly improved. When the hot water unit turns on the direct heating mode, the hot water unit will directly heat the water from about 15°C to 70°C. At this time, the water flow is at the minimum point. If the ambient temperature is high, the heating capacity of the hot water unit will increase. It will cause the outlet water temperature to reach 75°C or even higher, which will also cause the compressor discharge pressure in the hot water unit to increase, even exceeding the safe range of the compressor, thereby causing a large high-pressure i...

AI Technical Summary

Problems solved by technology

When the hot water unit turns on the direct heating mode, the hot water unit will directly heat the water from about 15°C to 70°C. At this time, the water flow is at the minimum point. If the ambient temperature is high, the heating capacity of the hot water unit will increase. It will cause the outlet water temperature to reach 75°C or even higher, which will also cause the compressor discharge pressure in the hot water unit to increase, even exceeding the safe range of the compressor, thereby causing a large high-pressure impact on the compressor, and then affecting the heat dissipation. Service life of the water unit

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