Photovoltaic-driven household split flat-plate type solar water heater

Abstract

The invention relates to a photovoltaic-driven household split flat-plate type solar water heater which belongs to the field of solar energy utilization devices and solves the problems of system-widepress-resistance and forced circulation. The photovoltaic-driven household split flat-plate type solar water heater adopts a flat-plate type heat collector (1) which directly constitutes a forced water circulation system with a water storage tank (10) through a photovoltaic pump (11) which is driven by a photovoltaic power supply (12), and the photovoltaic power supply (12), the photovoltaic pump(11) and the flat-plate type heat collector (1) are arranged on a rack respectively or in a three-in-one manner. The photovoltaic-driven household split flat-plate type solar water heater has the advantages of good heat collection effect, less heat loss, rapid startup temperature increase, system-wide press-resistance, smooth operation, reliability, long service life, ability of maximizing the utilization of solar energy resources, synchronous light-heat conversion and photoelectric conversion, automatic intelligent control of forced water circulation, simple structure, ability of saving energy and resources, economy, practicality and strong applicability, thereby being particularly applicable to multi-storey and high-rise residential buildings in cities, facilitating standard design and manufacture and being easy to be matched with the corresponding architectural design for construction and installation.

Description

technical field [0001] The invention belongs to the field of solar energy utilization devices, and relates to a photovoltaic-driven household split-type flat-plate solar water heater. Background technique [0002] There are generally two types of solar water heaters. One is an ordinary integral solar water heater, which is mainly composed of a solar collector (hereinafter referred to as the collector) and a water storage tank. The collector is formed by an array of all-glass vacuum heat collecting tubes And it is compactly connected with the water storage tank as a whole. The disadvantage is that the water in the glass tube is easy to scale, the heat collection efficiency is low, the glass tube is easy to break, resulting in vacuum failure or water leakage, and it is easy to freeze and crack when used in a severe cold environment. , In addition, the pressure bearing capacity of the system is limited, the water storage tank must be placed at a high position higher than the he...

AI Technical Summary

Problems solved by technology

[0002] There are generally two types of solar water heaters. One is an ordinary integral solar water heater, which is mainly composed of a solar collector (hereinafter referred to as the collector) and a water storage tank. The collector is formed by an array of all-glass vacuum heat collecting tubes And it is compactly connected with the water storage tank as a whole. The disadvantage is that the water in the glass tube is easy to scale, the heat collection efficiency is low, the glass tube is easy to break, resulting in vacuum failure or water leakage, and it is easy to freeze and crack when used in a severe cold environment. , In addition, the pressure bearing capacity of the system is limited, the water storage tank must be placed at a high position higher than the heat collector, the water is heated and used by the self-circulation of the head level difference, the heat collection speed is slow, and it is inconvenient to use. The compact connection is an integral type, so that Its applicability is greatly limited. Generally, it can only be installed on the roof of a building. This is more suitable for rural areas, but it is difficult for buildings with more than six floors in cities; the other is a conventional household split solar water heater. Separated from the water storage tank, the heat collecting element of the heat collector adopts a metal heat pipe, or a U-shaped metal flow channel vacuum tube type, equipped with a heat-conducting working fluid. The heat exchanger in the water tank transfers heat to the heated water. It has the incomparable advantages of ordinary integral solar water heaters. As far as the operation mode is concerned, most of them are natural circulation, that is, the circulation of heat-conducting working fluid depends entirely on its own potential difference. The disadvantage is that the installation position of the water storage tank must be higher than the heat collector and as close as possible to the heat collector, otherwise the heat loss of the heat-conducting working fluid will be large, the circulation flow resistance will be large, and it will be difficult to operate normally. There is also a forced circulation type, which is adopted in the market. Although electric control and drive circulation pumps can solve the problems of natural circulation, they will increase operating costs, consume conventional energy, generate noise pollution and have unsafe factors. In addition, indirect heat exchange will also reduce thermal efficiency, and at the same time Vacuum glass tubes must also be used in the heat collector. Once the vacuum is broken, the water will not escape, but it will affect the heat collection. Therefore, this kind of split household solar water heater has poor applicability and has limited application so far.

In view of the above-mentioned status quo, although solar water heaters have been widely used already, they are out of reach for the majority of residents in the city.

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