Solar heat collection system using three energy storage tanks and a plurality of circulating tubes

Abstract

The invention provides a solar heat collection system using three energy storage tanks and a plurality of circulating tubes, belonging to the field of solar energy utilization. Sunshine irradiates a heat collector until sunset, water in the water storage tank is gradually heated to the maximum temperature, after high noon, the sun inclines westwardly, thus the sunshine irradiation amount of the heat collector is reduced, the water temperature in the collector is lower than the water temperature in the water storage tank, the circulation between the water in the heat collector and the water in the water storage tank is stopped, the heat collector becomes a radiator, and the water in the heat collector is gradually cooled. The solar heat collection system using three energy storage tanks and a plurality of circulating tubes can utilize the sunshine irradiation amount in the time before the sunset from the high noon, and can achieve the required water temperature and water amount accord to the season or weather.

Description

technical field [0001] The present invention relates to a solar heat collection system, in particular to a solar heat collection system that makes full use of solar energy and a solar heat collection system that obtains a fluid with a relatively high temperature in different seasons and different weather conditions, especially a black porcelain composite ceramic solar heat collection system and its method of operation. Background technique [0002] Solar energy utilization includes photoelectric utilization and photothermal utilization. Photoelectric utilization mainly refers to solar cells, and photothermal utilization mainly refers to concentrated solar power generation devices and solar heat collection systems. The most widely used solar heat collection system is solar water heating systems. my country mainly adopts vacuum glass tube solar heat collector (device) system and flat-plate solar heat Heat (device) system. [0003] Solar energy is a surface energy source. Both...

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Problems solved by technology

[0003] Solar energy is a surface energy source. Both theory and practice have proved that the most efficient solar collector is a through-hole flat box solar collector made of metal materials. In this collector, the sun-absorbing surface is covered with heat to be heated Medium, heat exchange is the most direct and rapid, and the heat conduction distance is the shortest. However, the metal material that can withstand hot water corrosion for a long time is copper. This structure requires a large amount of copper. Copper is very expensive, the weld is very long, and the manufacturing process is complicated. , the manufacturing cost is very high, it is difficult to mass-produce and use

[0004]The main disadvantage of the vacuum glass tube is: the vacuum glass tube is composed of a coaxial inner and outer glass tube, one end is closed, the vacuum is drawn between the inner and outer tubes, the outer tube is transparent, and the inner tube External surface covered with black sun absorbing coating

Because the vacuum layer, sealing ring, dustproof ring, stock, etc. must be used, the black sunlight absorbing surface only accounts for about 60% of the lighting projected area, and part of the sunlight passes through the gap between the black surfaces and is not utilized. The heat collection efficiency is reduced during the noon period; the vacuum degree continues to decrease during use, reducing the heat preservation effect; a closed blind tube structure is easy to precipitate water alkali and impurities in the water, reducing the heat exchange area. The blind tube structure makes the glass tube account for the total About 20% of the heated water cannot be released for use, which further seriously reduces the thermal efficiency; the internal bonding force of the sunlight absorbing coating formed at low temperature is an intermolecular force, the structure is unstable, and the sunlight absorption rate is easy to decay. This is the current solar water heater. Common shortcomings of sunlight absorbing coatings; glass tubes are made of borosilicate glass with a melting temperature of 1650°C, high energy consumption and high price of boron oxide; these shortcomings lead to high manufacturing costs, high energy consumption and short life of vacuum glass tubes. The thermal efficiency is not high, and it decays with time. Generally, the effective service life is about 10 years

[0005] The main disadvantages of the copper tube plate solar collector are: the sunlight absorption rate of the sunlight absorbing coating is easy to attenuate; the copper material is very expensive and requires electrolytic purification, and the manufacturing cost and energy consumption are high; the lateral interval of the heat collecting copper tube is large, and the heat conduction distance Far, affect the efficiency; welds are easy to corrode; the diameter of the heat collecting copper tube is relatively small, all the heat in the collector is transferred through the heat collecting copper tube The channel will be significantly reduced, which will affect the heat collection efficiency; the double circulation method needs to increase the heat exchanger, which will increase the manufacturing and use costs, and the side of the heat exchanger in contact with water is prone to fouling; the general effective service life is 10-25 years

The service life of the existing glass vacuum tube and metal plate solar water heater (heater) system is less than 15 years, and the service life of the building is 50 to hundreds of years

[0021] There are two obvious energy losses during the working process of the above-mentioned flat-plate solar thermal collection system. As the temperature rises, the solar radiation during this period can account for about one-third of the full-day solar radiation. Second, the hot water in the collector cools naturally. This part of energy can account for the full-day sunlight according to the water capacity of different collectors. One-eighth to one-fifth of the radiant energy

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