پاورپوینت کامل Solar Energy: The Ultimate Renewable Resource 21 اسلاید در PowerPoint

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پاورپوینت کامل Solar Energy: The Ultimate Renewable Resource 21 اسلاید در PowerPoint

اسلاید ۴: How much solar energyThe surface receives about 47% of the total solar energy that reaches the Earth. Only this amount is usable.

اسلاید ۵: Putting Solar Energy to Use: Heating WaterTwo methods of heating water: passive (no moving parts) and active (pumps).In both, a flat-plate collector is used to absorb the sun’s energy to heat the water.The water circulates throughout the closed system due to convection currents.Tanks of hot water are used as storage.

اسلاید ۶: Heating Water: Active SystemActive System uses antifreeze so that the liquid does not freeze if outside temp. drops below freezing.

اسلاید ۷: Heating Water—Last ThoughtsEfficiency of solar heating system is always less than 100% because:% transmitted depends on angle of incidence,Number of glass sheets (single glass sheet transmits 90-95%), andComposition of the glass Solar water heating saves approx. 1000 megawatts of energy a yr, equivalent to eliminating the emissions from two medium sized coal burning power plants. By using solar water heating over gas water heater, a family will save 1200 pounds of pollution each year. Market for flat plate collectors grew in 1980s because of increasing fossil fuels prices and federal tax credits. But by 1985, when these credits were removed and fossil fuel prices were low, the demand for flat plate collectors shrunk quickly. While solar water heating is relatively low in the US, in other parts of the world such as Cyprus (90%) and Israel (65%), it proves to be the predominate form of water heating.

اسلاید ۸: Heating Living SpacesBest design of a building is for it to act as a solar collector and storage unit. This is achieved through three elements: insulation, collection, and storage.Efficient heating starts with proper insulation on external walls, roof, and the floors. The doors, windows, and vents must be designed to minimize heat loss. Collection: south-facing windows and appropriate landscaping.Storage: Thermal mass—holds heat. Water= 62 BTU per cubic foot per degree F. Iron=54, Wood (oak) =29, Brick=25, concrete=22, and loose stone=20

اسلاید ۹: Heating Living SpacesPassive SolarTrombe WallPassively heated home in C