Benefits of Solar Water Heating
The fuel needed to heat water can be reduced by solar water heaters because it capture renewable energy, the sun. Many solar water heaters use a small solar electric (photovoltaic) module to power the pump needed to circulate the heat transfer fluid through the collector. Use of these modules allows solar water heater to operate even during a power outage.
Solar water heaters can also be used for hotels and motels, car washing, swimming pools, restaurants, and others.
There are many designs for solar water heaters. But, in general consists of three main components:
1. Solar collectors, which convert solar radiation into heat.
2. Heat exchanger / pump module, which transfers heat from solar collectors into drinking water.
3. Storage tank to store solar hot water.
The most common types of solar collectors used in solar water heaters is a flat plate and evacuated tube collectors. In both cases, one or more collectors are installed on the south facing slope or roof and connected to the storage tank. When there is enough sunlight, a heat transfer fluid, such as water or glycol, is pumped through the collector. When the fluid through the collector, he is heated by the sun. Fluid which is heated and then circulated to heat exchangers, which transfer energy into the water tank.
When the owner of the home using hot water, cold water from the main water into the bottom of the solar storage tank. Solar hot water at the top of the storage tank flows into the conventional water heater and then to the faucet. If the water at the top of the solar storage tank hot enough, no further heating is required. If the solar-heated water is not too hot (because the clouds long enough), a conventional water heaters heat water until the desired temperature.