|Posted by Zena Arnella on July 31, 2010 at 9:52 AM|
Hello, August is here:
People are becoming more nature friendly, and most house owners are building greenhouses to harvest their own organic food. Do you want to build a solar greenhouse, let me tell you a bit about.
Calling a greenhouse solar is somewhat redundant, since all greenhouses are solar heated to some extent. The greenhouse itself traps the heat each day, as anyone who has been inside a greenhouse for just a few minutes on a sunny day knows. Although a traditional greenhouse acts as a natural solar collector on sunny days, it does not retain the sun's heat at night.
Consequently, 75 to 80 percent of the cost of heating a greenhouse by conventional energy sources is expended at night. To retain the sun's heat, the greenhouse requires something into which the heat can be stored. This heat sink can consist of barrels of water, rocks, concrete walls, or other thermal mass. At night the stored heat emanates back through the greenhouse. There are two types of solar energy systems: active and passive.
The system most commonly used in home greenhouses is passive. Here, a thermal mass, such as rocks or water-filled drums, captures heat during the day and radiates it back at night. The active system requires electricity or another conventional source of energy to pump heated air into a storage area, such as a basement, filled with rocks or water drums. More efficient than passive solar heating, this type of system is also more expensive and more complex. Both types of solar systems work better in areas with a high percentage of sunny days, even if they are cold, than they do in areas where overcast days are common.
So next time you are planning to build a green house try it solar and see the eco difference.
See you next month,
Lots of kisses,