A direct-heating dual-source heat pump water heater control method and control device thereof

Abstract

The invention discloses a method and device for controlling a direct heat type double-source heat pump water heater and relates to a fluid heater provided with a solar heat collector and a heat pump and a control method of the fluid heater. A control device detects the outlet water temperature of the solar water heater and changes the temperature control strategy according to the outlet water temperature. When the water temperature is in a first water temperature control zone, the heating amount of the heat pump is changed and the water temperature is controlled by adjusting the operation frequency of the direct heat type frequency conversion heat pump. When the water temperature is in a second water temperature control zone, the water temperature is controlled by changing the water supplementing speed of a water supplementing flow adjusting element, solar energy is fully used for accumulating heat, the heat pump heating time in sunlight intensity lowering periods before and after the sunset is shortened, adaptation to different sunlight intensities is achieved, the solar energy is preferably and fully utilized, the water inlet temperature of a unit is low, operation efficiency is high, safety and reliability are achieved, high-pressure protection of the unit due to the excessively high outlet water temperature can be avoided, the requirement for hot water supply can be met, meanwhile, the requirement for the power of a compressor can be lowered, the utilization rate of equipment is improved, and early-stage investment cost is lowered.

Description

technical field [0001] The invention relates to a fluid heater with a solar heat collector and a heat pump and a control method thereof, in particular to a control method and a control device of a direct heating type dual-source heat pump water heater. Background technique [0002] The current non-renewability of "fossil energy" such as coal, oil, and natural gas and the rapid reduction of global reserves have brought about a worldwide energy shortage. Coupled with the deteriorating ecological environment of the earth, it is necessary to protect the ecological environment and accelerate development and utilization. Renewable energy has become an urgent and arduous task for mankind. Air source heat pump water heaters are more and more recognized by consumers because of their advantages such as energy saving and environmental protection. Air source heat pump hot water products mainly include direct heating, circulating heating, and static heating. Water stability and many ot...

AI Technical Summary

Problems solved by technology

However, the technical problem of how to organically combine solar energy and heat pump water heaters has not been effectively resolved

However, due to the small flow diameter of the thermostatic regulating valve, the execution power is poor, and it is easy to be blocked by impurities

Especially when the temperature of the water heated by solar energy rises, due to the narrow action range of the thermostatic regulating valve to adjust the water flow, it is very easy for the unit to fail to control the set outlet water temperature, and the outlet water temperature is too high to cause the unit to have a high-voltage protection problem

[0006] In addition, although the above-mentioned existing technical solutions solve the problem of combining heat pumps and solar energy, because of the small demand for hot water in summer, the high ambient temperature in summer, and the good illuminance of solar energy, the heating capacity of the heat pump unit when heating hot water Greatly exceeding the demand, the working time of the unit is very short, and more than half of the time is in standby mode, resulting in low equipment utilization and long payback period

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