ES 79- Renewable & Alternative Energy Systems

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Presentation transcript:

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 Wind Turbines/Energy Systems Ground Source Heat Pumps Fuel Cells Biomass

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

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

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

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

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

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)

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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