Solar space heating and cooling

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Solar space heating and cooling

  1. 1. Solar Space Heating And Cooling -Abhishek Naik -Aniket Gavali -Omkar Naik -Kaustubh Patil
  2. 2. Space Heating • A solar space –heating system can consist of a passive system, an active system, or a combination of both. Passive systems are typically less costly and less complex than active systems. However, when retrofitting a building, active systems might be the only option for obtaining solar energy
  3. 3. Passive Solar Space Heating • Passive Solar Space Heating takes advantage of warmth from the sun through design features, such as large south-facing windows, and materials in the floors or walls that absorb warmth during the day and release that warmth at night when it is needed most.
  4. 4. • Passive solar design systems usually have one of the three designs:• Direct Gain stores and slowly releases heat energy collected from the sun shining directly into the building and warming materials such as tile or concrete .
  5. 5. • Indirect Gain uses materials that hold, store, and release heat; the material is located between the sun and living space.
  6. 6. • Isolated Gain collects solar energy remote from the location of the primary living area.
  7. 7. Active Solar Space Heating • Active solar space heating systems consist of collectors that collect and absorb solar radiation combined with electric fans or pumps to transfer and distribute that solar heat. • Active systems also generally have an energy storage system to provide heat when the sun is not shining.
  8. 8. • The two basic types of active solar space-heating systems use either liquid or air as the heat-transfer medium in their solar energy collectors • Liquid-based systems heat water and air-based systems heat air in the collector. • Both of these systems collect and absorb solar radiation, then transfer the solar heat directly to the interior space or to a storage system, from which the heat is distributed.
  9. 9. • An auxiliary or backup system provides heat when storage is discharged. • Liquid systems are more often used when storage is included.
  10. 10. Solar Space Cooling • In the chiller , refrigerant vapor from the evaporator is absorbed by a solution mixture in the absorber • This solution is then pumped to the generator • There the refrigerant re-vaporizes using a waste steam heat source .The refrigerant –depleted solution then returns to the absorber via a throttling device. • The two most common refrigerant/absorbent mixture used in absorption chillers are water/ lithium bromide and ammonia / water
  11. 11. • Systems use a low-temperature liquid refrigerant that absorbs heat from the water to be cooled and converts to a vapor ( in the evaporator section ). • This used for space cooling • The refrigerant vapor is then compressed to a higher pressure by a compressor or generator and converted back into a liquid by rejecting heat to the external surrounding in the condenser section.
  12. 12. • Next, it is expanded to a low-pressure mixture of liquid and vapor (in the expander valve), which boils in the evaporator section, absorbing heat and producing the cooling effect. • Then the cycle is repeated. • Heat provided in the system is by solar collector in the form of hot water.
  13. 13. Thank YOU

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