Direct relies on warm water rising, a phenomenon known as natural convection, to circulate water through the vacume tubes and to the tank.
What is Solar Water Heating?
Solar water heating collectors capture and retain heat from the sun and transfer this heat to a liquid. Solar thermal heat is trapped using the “greenhouse effect,” in this case is the ability of a reflective surface to transmit short wave radiation and reflect long wave radiation. Heat and infrared radiation (IR) are produced when short wave radiation light hits a collector’s absorber, which is then trapped inside the collector. Fluid, usually water, in contact with the absorber collects the trapped heat to transfer it to storage.
Popular type of collector is called evacuated tube, which has a long, skinny absorber that is inside a glass tube. The tube has the air evacuated out of it, which makes it highly insulated—not too different from a thermos used to keep drinks hot.
There are two types of Solar water heater or Solar Geyser systems:
- Pressurized Geyser
- Non-Pressurized Geyser