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How does residential solar water heater work

Views:1     Author:Site Editor     Publish Time: 2019-10-03      Origin:Site

In the global solar thermal energy market, the dominant markets are China, Europe, Japan and India. Designs that are suitable for hot climates are made simpler and cheaper, and can be considered a suitable technology in these places. So residential solar water heater is also more and more, but how does residential solar water heater work?

You will know:

What is residential solar water heater

residential solar water heater working principle

Application of residential solar water heater


What is residential solar water heater

A solar water heater is a device that uses water contained in sunlight to warm water. It is a kind of renewable energy technology. It can be divided into active and passive types. The passive type usually includes a water storage tank and a heat collector. The active type also includes a pump for circulating water and a function for controlling temperature. The sink and the collector may be integrated into one body and may be separated. Among the existing renewable energy equipment, energy conversion efficiency is the highest and durability.


Residential solar water heater is a solar water heater for small users, which has been widely used in people's lives.


Working principle

Solar water heaters convert solar energy into heat and heat water from low to high temperatures to meet the hot water use in life and production. The vacuum tube type domestic solar water heater is composed of a heat collecting tube, a water storage tank and a bracket and the like, and the conversion of solar energy into heat energy mainly depends on the heat collecting tube. The heat collecting tube utilizes the principle of hot water floating on the cold water to make the water generate micro-circulation to reach the required hot water.


  • Endothermic process

When the hollow tube type water heater absorbs heat, the solar radiation passes through the outer tube of the vacuum tube, is absorbed by the collector coating film, and is transferred to the water inside the tube along the inner tube wall. After the water in the tube absorbs heat, the temperature rises, the specific gravity decreases and rises, forming an upward power, forming a thermosyphon system. As the hot water continues to move up and is stored in the upper part of the water storage tank, while the lower temperature water is continuously replenished along the other side of the tube, the whole tank water is raised to a certain temperature. The plate type water heater is generally a split type water heater. The medium is naturally circulated by the thermosyphon in the heat collecting plate, and the heat of the solar radiation on the heat collecting plate is timely transmitted to the water tank, and the heat is exchanged through the heat exchange (jacket or coil) in the water tank. Transfer to cold water. The medium can also transfer heat through the pump cycle.


  • Circulation line

Domestic solar water heaters usually work in a natural circulation with no external power. The vacuum tube solar water heater is a direct insertion structure, and the hot water is powered by gravity. Flat-panel solar water heaters are powered by tap water pressure (called top water). The solar central heating system uses pump circulation. Since the solar water heater has a small heat collection area, in consideration of heat energy loss, pipeline circulation is generally not used.


Application field

  • Evacuated tube

ETSCs can be more useful than other solar collectors during winter season. ETCs can be used for heating and cooling purposes in industries like pharmaceutical and drug, paper, leather and textile and also for residential houses, hospitals nursing home, hotels swimming pool etc.


  • Swimming pools

Floating pool covering systems and separate STCs are used for pool heating.

Pool covering systems, whether solid sheets or floating disks, act as insulation and reduce heat loss. Much heat loss occurs through evaporation, and using a cover slows evaporation.


  • STCs for nonpotable pool water use are often made of plastic. Pool water is mildly corrosive due to chlorine. Water is circulated through the panels using the existing pool filter or supplemental pump.


After reading the above article, perhaps you have already understood the principle of solar water heaters. Since solar water heaters are used in many ways, although providing domestic hot water in a residential environment is perhaps the most well-known application, there are many other applications that are not yet so popular.



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