The use of solar energy from the sun is one of the ways where depletion of resources (especially that of consumable energy generators such as oil and coal) is lessened and conservation of energy is maximized. Knowing on how to build a simple and cheap diy homemade solar powered air conditioning heater to heat up a room or a house is one example of the application of solar energy for household use.
The basic principle in making a solar air heater lies in the behavior and movements of air, metals and colors. Inside the main body of the solar air heaters are pipes or tubings coated in black paint (using black paint enhances the ability of the pipes to absorb heat). These pipes are also made up of metals which have abilities to attract and absorb heat (some environmentalists use aluminum cans because this metal has a high thermal conductivity and at the same time by doing so recycling is done lessening the garbage and effect to land contamination).
Solar air heaters are usually situated in a vertical position where its body or at least a large portion of the whole apparatus is exposed to the sun's rays. As cool air enters the bottom portion of the tank, it passes through the black-coated pipes and it is in this process that transfer of heat from the pipes to the transient air happens (convection). The laws of heat transfer states that heat moves from the hotter body to a cooler one, following this law, the pipes which in this situation is the hotter object gives off its heat into the cooler body, the moving air.
Basic theories of science also states that one of the properties of air is that cooler air moves down and hotter air goes up. This is partly one of the hidden reasons why solar air heaters are suggested to be built vertically rather than horizontally, because without using any other equipments or devices cool air enters the bottom of the heater then as the temperature goes up due to the transfer of heat this air goes up into air vents or tubes which is connected to the room or house where increase in temperature is desired. No more compressor or pump is necessary for such movement.
The longer the pipings and tubings are and the more tubes the air passes through the higher the increase of temperature from the final output to the initial input are achieved. Designs such as loops and the "snake" piping configuration are sometimes suggested by literature for use as it requires slower rising of air to the outlet and having more heat transfer processes as it passes through. However by using these complex patterns it must also be taken into consideration that this also has a negative side because if insulation of heat is quite poor the longer the pipings are the more chances the initial heat acquired by the air is instead given off to the surroundings. Now you have a better idea on how to build a simple and cheap diy homemade solar powered air conditioning heater.
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