A direct heating type dual-source heat pump water heater and its control method

Abstract

The invention discloses a directly-heated type double-source heat pump water heater and a control method thereof, and relates to a fluid heater provided with a solar heat collector and utilizing a heat pump and a control method of the fluid heater. The directly-heated type double-source heat pump water heater comprises a directly-heated type variable-frequency heat pump, a solar water heater, a heat storing water tank, water-supplementing flow regulating element and a control device, heat collecting tubes of the solar water heater are of lower-end water inflow and high-end water outflow structures, a cold water supplying pipeline is connected to the directly-heated type variable-frequency heat pump through the water-supplementing flow regulating element, a hot water outlet of the directly-heated type variable-frequency heat pump is connected to the solar water heater, and a water outlet pipeline of the solar water heater is connected to the heat storing water tank. The control device detects water outflow temperature of the solar water heater, changes temperature control strategies according to the water outflow temperature and adapts to different sunlight intensity by changing operation frequency of the directly-heated type variable-frequency heat pump or changing water supplementing speed of the water-supplementing flow regulating element, so that hot water supply requirements can be met while compressor power is reduced, equipment utilization rate is increased, and early investment cost is lowered.

Description

technical field [0001] The invention relates to a fluid heater with a solar heat collector and utilizing a heat pump and a control method thereof, in particular to a direct heating type dual-source heat pump water heater and a control method for the 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 ...

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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