by Jeff Kubina
Solar energy can be used in various ways – to provide electricity, mechanical energy, heat and lighting. The passive solar heating and cooling can save you money on electricity. The design of a building is very important to take advantage of passive solar energy. The building and windows are designed so that carefully balance their energy needs without the need for mechanical equipment. The benefits to using solar through windows and pumps, and fans are little used.
The passive solar energy use components such as building walls, floors, ceilings, windows, exterior building and landscaping to control heat generated by the sun. Designs attempt to trap solar heat and store heat energy from direct sunlight. Passive cooling minimizes the effects of solar radiation through shading or generating convection currents of air ventilation.
The natural lighting and passive heating and cooling are the main solar concepts.
Daylight: a commercial building can reduce your electric bill by using the light from the sky around it, not just daylight. Will create a pleasant environment and reduce air conditioning costs, because it is a considerable amount of heat generated by light bulbs or ballasts.
A good daylight system takes into account many factors, such as:
* The general direction and planning of places to be illuminated.
* The location, shape and dimensions of the openings and the openings through which pass the light of day.
* The strategic placement and orientation of the internal surfaces that may be capable of reflecting the light of day.
* The location of movable or permanent objects which provide protection from excessive light or glare.
Passive Solar Heating: Passive solar heating occurs when sunlight strikes an object and the object absorbs heat. This can happen in a building effectively if the windows are oriented correctly. The stronger the window facing south, but any orientation within 30 degrees to the south is appropriate. Once the heat is inside the building several techniques can be taken to preserve and promote it. For passive solar heating, which requires roughly eight percent of the surface is the ceiling to floor windows on the walls. Once the heat is trapped inside a building and the structure is watertight, heat loss can be prevented effectively. The double glazed windows are not very effective at trapping heat. We need to install high performance windows with insulated frames, multiple coatings, insulating glass spacers and filled with inert gas. All these elements can reduce heat loss by 50 to 75 percent.
Passive cooling: The different techniques to passive solar heating. Here the buildings are designed to keep out solar heat and air. The internal heating of animate and inanimate objects is minimized and is dissipated into the environment through ventilation.
Devices, fixed or adjustable shading reduces solar radiation. We can make a shadow on the building with natural vegetation and use of special glass in the windows. External shading devices can reduce the direct solar radiation by up to 90 percent, allowing a significant amount of indirect light.
External heat gain can also be minimized by good insulation, reducing the size of the windows and the use of reflective materials on the walls and ceiling. In the design stage of construction, should also pay attention to cross ventilation and wind direction, the source of cooling known as the night breeze.
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