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What is the working principle of commercial solar water heaters?

Views:0     Author:Site Editor     Publish Time: 2020-03-07      Origin:Site

Commercial solar water heateris a photothermal converter, which is different from the traditional natural use. Commercial solar water heater converts solar energy into heat energy, and heats water from low temperature to high temperature to meet people's hot water use in life and production.


Outline :

l  What is the working principle?

l  What is the use process?


What is the working principle?

Commercial solar water heaters convert solar energy into heat energy, and heat water from low temperature to high temperature, so as to meet people's hot water use in life and production. Commercial solar water heater is composed of collector, water storage tank and related accessories. Converting solar energy into heat energy mainly depends on collector tube. 


The collector receives high temperature of sunshine irradiation surface and low temperature of collector tube back surface, while the water in the tube produces temperature difference reaction. Using the principle of floating, cooling and sinking under water, the water produces microcirculation and reaches the required hot water. Sunlight passes through the first glass of the heat absorber tube of the commercial solar water heater and shines on the black heat absorber layer of the second glass, which absorbs the heat of the solar energy. 

Because the vacuum insulation between the two glass layers, the heat transfer will be greatly reduced (radiation heat transfer still exists, but there is no heat conduction and heat convection), and most of the heat will be absorbed. The water can only be passed to the inside of the glass tube to heat the water in the glass tube of the commercial solar water heater. The heated water can easily enter the thermal storage bucket along the heating surface of the glass tube. The relatively low temperature water in the bucket enters the glass tube along the backlight of the glass tube to supplement, so that the water in the thermal storage bucket keeps circulating. Heating, so as to achieve the purpose of hot water.

 

When the vacuum tube water heater absorbs heat, the solar radiation passes through the outer tube of the vacuum tube and is absorbed by the collector coating and then transferred to the water in the tube along the inner tube wall. After heat absorption, the temperature rises, the specific gravity decreases and rises, forming an upward motive force and constituting a thermosiphon system. As the hot water moves upwards and is stored in the upper part of the tank, and the lower temperature water is continuously replenished along the other side of the pipe so that the whole tank water rises to a certain temperature.

 

Flat-plate water heaters, generally split water heaters, the medium in the collector plate due to the natural cycle of thermal siphon, solar radiation in the collector plate heat transfer to the water tank in time, the water tank through heat exchange (jacket or coil) heat transfer to cold water. The medium can also transfer heat through pump circulation.

 

What is the use process?

The flat panel solar water heater of commercial solar water heater works in the top water mode. The vacuum tube commercial solar water heater can also work in the top water mode. The jacket or coil can be used in the water tank.


The advantages of the commercial solar water heater are that the water supply pressure is tap water pressure, which is higher than the natural gravity pressure. Especially when the installation height is not high, its characteristics are that the water temperature is first high and then low, easy to master, easy to adapt to the users, but the tap water is required to maintain the water supply capacity.

The working mode of commercial solar water heater with top water is more expensive and expensive than that of gravity water heater.

1. Temperature difference control collector cycle

There are collector thermometer and water temperature sensor in the commercial solar hot water heating system. After the solar radiation is absorbed by the collector system, the temperature of the collector tube rises. When the temperature of the collector and the temperature difference between the water tank and the water (t) is set. The detection system sends out instructions. The circulating pump inputs the cold water from the central water heater into the collector, and the water is added. Return to the water tank after heat, so that the water in the water tank reaches the set temperature.

2. Heating Pipeline Circulation System

A hot water circulating pump is added to control the circulation of the heating pipe through the controller. When the water temperature reaches the set temperature, the ground heating circulating pump is automatically started. So that the high temperature water can be circulated through the ground heating coil in the room. So that the indoor temperature can be continuously improved. When the water temperature of the water tank is lower than a certain set value. The circulating pump of the ground heating pipeline is automatically stopped.

 

Conclusion

Commercial solar water heater as a clean and pollution-free heating method has been recognized by the public. And its problems have been accompanied by our use.For  vacuum tube solar water heater,  evacuated tube solar water heater,  split solar water heater,  is same applies .


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