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ES 79- Renewable & Alternative Energy Systems

ES 79- Renewable & Alternative Energy Systems. De Anza College- EMT Program Spring Quarter 2002 Stephen J. Murphy P.E. Renewable and Alternative Energy Systems. Solar Heating and Power Systems Space Heating/Cooling Domestic hot water heating/swimming pools Photovoltaic (PV) Power

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ES 79- Renewable & Alternative Energy Systems

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  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 @ 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 @ 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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