Views: 52 Author: Site Editor Publish Time: 2019-11-08 Origin: Site
Solar water heaters are currently an energy-saving and environmentally-friendly type of water heater, providing people with the need to live and produce water heaters. There are many components in the current solar water heater, and the functions they target are different. And the residential solar water heater is not only for individuals to use, it has other applications, the following will be explained in detail.
Definition of residential solar water heater
Brief introduction of Residential solar water heater units
Application of residential solar water heater
Solar water heaters are heating devices that convert solar energy into heat energy, heating water from low temperature to high temperature to meet the hot water use of people in life and production.
Residential solar water heater is a product that applies solar water heaters to life and is installed in private houses or communities for daily use. Now, residential solar water heater has become very popular.
Solar thermal collectors capture and retain heat from the sun and use it to heat a liquid.Two important physical principles govern the technology of solar thermal collectors.
Flat plate collectors are an extension of the idea to place a collector in an 'oven'-like box with glass directly facing the Sun.
Evacuated tube collectors are a way to reduce the heat loss, inherent in flat plates. Since heat loss due to convection cannot cross a vacuum, it forms an efficient isolation mechanism to keep heat inside the collector pipes.
One way to power an active system is via a photovoltaic panel. To ensure proper pump performance and longevity, the (DC) pump and PV panel must be suitably matched. Although a PV-powered pump does not operate at night, the controller must ensure that the pump does not operate when the sun is out but the collector water is not hot enough.
A bubble pump is suitable for flat panel as well as vacuum tube systems. In a bubble pump system, the closed HTF circuit is under reduced pressure, which causes the liquid to boil at low temperature as the sun heats it. The steam bubbles form a geyser, causing an upward flow. The bubbles are separated from the hot fluid and condensed at the highest point in the circuit, after which the fluid flows downward toward the heat exchanger caused by the difference in fluid levels.The HTF typically arrives at the heat exchanger at 70°C and returns to the circulating pump at 50°C. Pumping typically starts at about 50°C and increases as the sun rises until equilibrium is reached.
A differential controller senses temperature differences between water leaving the solar collector and the water in the storage tank near the heat exchanger.
The simplest collector is a water-filled metal tank in a sunny place. The sun heats the tank. This was how the first systems worked.
ICS or batch collectors reduce heat loss by thermally insulating the tank. This is achieved by encasing the tank in a glass-topped box that allows heat from the sun to reach the water tank.
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.An ETC can operate at a range of temperatures from medium to high for solar hot water, swimming pool, air conditioning and solar cooker.ETCs higher operational temperature range (up to 200 °C (392 °F)) makes them suitable for industrial applications such as steam generation, heat engine and solar drying.
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. In mild environments, unglazed plastic collectors are more efficient as a direct system. In cold or windy environments evacuated tubes or flat plates in an indirect configuration are used in conjunction with a heat exchanger. This reduces corrosion. A fairly simple differential temperature controller is used to direct the water to the panels or heat exchanger either by turning a valve or operating the pump. Once the pool water has reached the required temperature, a diverter valve is used to return water directly to the pool without heating.Many systems are configured as drainback systems where the water drains into the pool when the water pump is switche.
Solar water heaters really bring us convenience, so many machines made up of parts can be used in so many fields. Whether it is winter or summer, we can use it, it has become an indispensable life essential.
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