Solar water heating system with ceramic sun panel operated and controlled by single water pump

Abstract

The invention discloses a solar water heating system with a ceramic sun panel operated and controlled by single water pump. The system consists of a ceramic solar heat collector, a lower circulation pipe, a water pump, a temperature-conservation heat storage water tank, an upper circulation pipe, inlet and outlet air pipes, a heat collector temperature sensor, a water tank temperature sensor and a controller; the circulation system of the solar water heating system of the ceramic sun panel is not provided with any valve so as to ensure the water channels and gas channels to be unimpeded under any condition; and the outlets of the inlet and outlet air pipes are 0.5-2 meters higher than an upper collection pipe. When the temperature in the ceramic solar heat collector reaches the set temperature delta A, the controller orders the water pump to be started, and when the temperature in the ceramic solar heat collector reaches the set temperature delta B, the water pump stops working, the ceramic solar water heating system can not be frozen to be cracked under any condition, the problem of great heat loss in hot water can not happen, and the system has a simple structure and low cost.

Description

Technical field [0001] The invention relates to a solar water heating system, and to the control of a solar water heating system, in particular to a ceramic solar panel solar water heating system controlled by a single water pump. Background technique [0002] Solar energy utilization includes photovoltaic utilization and solar thermal utilization. Photovoltaic utilization mainly refers to solar cells. Photothermal utilization mainly refers to concentrating solar power generation devices and solar collectors. The most widely used solar collector is solar water heater. The key issue is solar energy collection. Control of heating body and solar water heating system. my country mainly uses evacuated glass tube solar collectors, and foreign countries mainly use copper tube plate solar collectors. The new type of solar collector is a black ceramic composite ceramic solar panel, which is a hollow ceramic plate with import and export, referred to as ceramic solar panel. [0003] Solar e...

AI Technical Summary

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, that is, a hollow plate with import and export. In this collector, the sunlight absorbing surface Covered with the medium to be heated, the heat exchange is the most direct and rapid, and the heat conduction distance is the shortest. However, copper was mainly used in the past. This kind of heat collector needs to use a large amount of copper. Copper is very expensive, the welding seam is long, and the manufacturing process is complicated. The manufacturing cost is very high, it is difficult to produce and use on a large scale, so ceramic solar panels are produced

[0004] The main disadvantages of vacuum glass tubes are: the vacuum glass tube is composed of coaxial inner and outer glass tubes, one end is closed, the inner and outer tubes are vacuumed, the outer tube is transparent, and the outer surface of the inner tube is covered with solar absorbing paint

Because the vacuum layer, sealing ring, dustproof ring, and stock must be used, the black sunlight absorbing surface only accounts for about 60% of the lighting projected area. When the sun shines directly at noon, part of the sunlight passes through the gap between the black surfaces and is not utilized. , the heat collection efficiency is reduced at noon when the sun is strongest; the vacuum degree keeps decreasing during use, reducing the heat preservation effect; a closed blind pipe structure is easy to precipitate water alkali and impurities in water, reducing the heat exchange area; solar energy absorbs sunlight from the paint The absorption rate is easy to attenuate, which is a common shortcoming of solar water heater solar absorbing coatings or solar absorbing films; the glass tube is made of borosilicate glass, the melting temperature is 1650 ° C, the melting time is several hours, and the manufacturing energy consumption is high. High; these shortcomings lead to high manufacturing cost of vacuum glass tubes, relatively high manufacturing energy consumption, and relatively short service life. Generally, the effective service life is 7-8 years

[0005] The main disadvantages of copper tube plate solar collectors are: the sunlight absorption rate of solar absorbing coatings is easy to attenuate; copper is very expensive and needs electrolytic purification, high manufacturing cost and high energy consumption; the horizontal interval of heat collecting copper tubes is large, and the heat conduction distance Far, affecting efficiency; welds are easy to corrode; general effective service life is 7-10 years

The antifreeze double circulation system has a complex structure and high cost, and it needs to replenish antifreeze in time

For large systems, the amount of antifreeze is large and the cost is high, which obviously affects the thermal efficiency. Most of them use drainage antifreeze. The large system has long and complicated pipelines, and it is easy to form a vacuum when draining water. The vacuum causes negative pressure, and it is difficult to ensure the water in the system. Empty completely, any stored water will cause damage to solar heat collectors or pipes when it freezes, so the antifreeze valve automatic drainage system needs to install various automatically controlled electric or manual valves such as vacuum breaker valves, intake valves, and drain valves , due to possible power outages, electrical, or mechanical failures, the reliability is reduced. The traditional solar thermal collection system has a service life of about 10 years, while the ceramic solar panel thermal collection system has a service life of several decades, hundreds of years, and requires higher reliability.

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