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Renewable and Alternative Energy Systems. Sola

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Renewable and Alternative Energy Systems. Solar Heating/Power systems: Solar 'insolation' (incident solar radiation) Energy balance. Greenhouse effect ' ... – PowerPoint PPT presentation

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Title: Renewable and Alternative Energy Systems. Sola


1
ES 79- Renewable Alternative Energy Systems
  • De Anza College- EMT Program
  • Spring Quarter 2002
  • Stephen J. Murphy P.E.

2
Renewable and Alternative Energy Systems
  • Solar Heating and Power Systems
  • Space Heating/Cooling
  • Domestic hot water heating/swimming pools
  • Photovoltaic (PV) Power
  • Wind Turbines/Energy Systems
  • Ground Source Heat Pumps
  • Fuel Cells
  • Biomass

3
Renewable and Alternative Energy Systems
  • Solar Heating/Power systems
  • Solar insolation (incident solar radiation)
  • Energy balance
  • Greenhouse effect
  • Solar constant- 430 Btu/ft2/hr _at_ top of
    atmosphere
  • Solar geometry CRITICAL !
  • Altitude angle
  • Azimuth angle

4
Solar Heating/Power Systems
  • Historical Solar Energy Uses
  • Steam generation/Steam engines
  • Desalinization plants
  • Solar cookers

5
Solar Heating/Power Systems
  • Present-Day Solar Energy Uses
  • 1973 Oil Embargo jump-started business
  • State solar tax credits initiated
  • Utility rebates/low cost financing packages
  • Domestic hot water (DHW)
  • Space heating
  • Photovoltaic Electricity Generation

6
Solar Heating/Power Systems
  • Active Solar heating systems
  • Solar Collectors
  • Low tech- i.e swimming pool (coiled plastic
    piping)
  • FPC design (Flat Plate Collector)
  • Efficiency of collector is critical factor !
  • copper sheet with black selective surface high
    absortivity/low emissivity
  • South facing
  • Tilt angle latitude
  • i.e. San Jose _at_ 37 0 tilt angle

7
Active Solar Heating Systems
  • System Types/Classifications
  • Forced air
  • Rock bed thermal storage with forced convection
    fans
  • Preheating for domestic water heating possible
  • Hydronics
  • Domestic hot water/swimming pool
  • Space heating systems

8
Solar Heating/Cooling Systems
  • Passive Solar Heating/Cooling Systems
  • Thermal Mass/Storage
  • Solar geometry
  • Summer shading devices
  • Overhangs
  • Deciduous trees
  • Mechanical blinds
  • Building envelope/insulation
  • Natural convection (no fans/pumps)

9
Passive Solar Heating/Cooling Systems
  • Direct Gain
  • Massive floor/wall design
  • Water storage containers
  • In-direct Gain
  • Trombe wall design
  • Solar greenhouses
  • Thermosiphoning
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