Solar energy heating and electric heating combined water heating method and its special device

Abstract

The present invention relates to combined solar energy and electric power water heating method and apparatus. The hot water producing process includes heating water with solar energy in day time, heat pump heating with volley electric power in the night, heating water with electric heating element as the replenishment, and storing hot water in water tank to ensure constant hot water supply. The present invention has reduced power consumption and decreased peak electric power consumption.

Description

technical field [0001] The invention relates to the field of solar energy utilization, in particular to a method for producing hot water combined with solar heating and electric heating and a special device thereof. Background of the invention [0002] The amount of solar energy is huge, and the annual solar radiant energy reaching the earth's surface is about 130 trillion tons of standard coal, but its characteristics are dispersion, discontinuity and instability. Although the total amount of solar radiant energy reaching the earth's surface is large, the energy flux density is very low. On average, the solar radiation intensity at noon on a sunny day in summer is the highest, projecting to the earth's surface 1m 2 The solar radiation power on the area is only about 1kw, only half in winter, and only about 1 / 5 in cloudy days. Therefore, if you want to obtain a certain radiation power, you need a larger radiation receiving area. The so-called discontinuity and instability...

AI Technical Summary

Problems solved by technology

Analyzed according to the requirements of the aforementioned solar water heating device and electric composite heating, the disadvantages of this technical solution are: when there is sunlight in the daytime and the solar radiation convective heat exchanger is working, the device is always in real-time working state, and the heat pump is used for heating. Although the average power consumption is about one-third of that of ordinary electric heating, it takes up the power load during peak hours. Therefore, it must consume a large amount of high-level electric energy during peak hours, which is not good for balancing the day and night loads of the power grid. Once such a device The promotion will further widen the gap between the peak and valley of the power grid and intensify the waste of coal resources for power generation

In this technical solution, both the solar heat collector and the electric heating element are the front end of the heat pump, the purpose is only to improve the air conditioning output efficiency of the heat pump, and the heat pump setting does not contribute to the production of hot water, and the hot water produced cannot It meets the standard requirements of hot water installations that supply water at a temperature above 45°C for 24 hours in 365 days. In rainy days or winter, the real-time heating of electric heating elements must be relied on to realize the heating of air conditioners and hot water. The electricity load during the time period consumes a large amount of high-level electric energy. Once such a device is promoted, it will further widen the gap between the peak and valley of the power grid, and aggravate the waste of coal resources for power generation.

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