The popularity enjoyed by passive solar water heaters is much bigger than you might imagine. Unfortunately not many are aware of what they are or how they work. You might notice one big tank inside a house and not realize that it is basically one part of one passive heating system. So what does passive solar system actually mean.?
Passive solar technologies are systems that are using the power of the sun in order to obtain energy without adding extra mechanical systems. This is in contrast with the use of active solar technologies. This technology type will help a lot in converting sunlight to heat so that you can use it with different purposes. The fact that is interesting is that energy sources that are extra will only be minimally required or not at all required. One good example that we can mention is solariums built on southern sides of buildings. Alternatively passive cooling can also be utilized and all is based on the same principles but with opposed goals. It can be used to reduce the cooling requirements we see during summer.
Do not make mistakes and think that passive systems are the same thing as active solar water heating systems. A basic rule of thumb revolves around using conventional energy. If pumps or fans are powered with its use then the system is an active one. There are also passive systems that use small amounts of conventional energy sources.
Passive solar water heating technologies will also include different indirect and direct space heating aimed solar gains. Different heating systems exist. Some are based on therman mass while others on phase-change materials or thermosiphons. In a wider spread technologies that are a part of passive solar use will also include solar forges and solar furnaces. These are systems that do need an external energy source in order to align receivers or concentrating mirrors. In wide spread use they are actually pretty ineffective. The best way to implement passive solar systems is through the use of low grade energy needs.
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