Renewable and Alternative Energy Systems. Sola

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ES 79- Renewable Alternative Energy Systems

• De Anza College- EMT Program
• Spring Quarter 2002
• Stephen J. Murphy P.E.

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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

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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

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Solar Heating/Power Systems

• Historical Solar Energy Uses
• Steam generation/Steam engines
• Desalinization plants
• Solar cookers

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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

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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

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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

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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)

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Passive Solar Heating/Cooling Systems

• Direct Gain
• Massive floor/wall design
• Water storage containers
• In-direct Gain
• Trombe wall design
• Solar greenhouses
• Thermosiphoning