lecture_5_solar_utilization

lecture_5_solar_utilization - Solar Utilization...

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1 UNIVERSITY OF FLORIDA Solar Utilization Solar Collectors:   liquid cooled non-concentrating flat plate solar collectors      typical working temperatures: 60 – 120 deg C   air cooled non-concentrating flat plate solar collectors     typical working temperatures: 60 – 120 deg C   compound curvature continuously tracking types     typical working temperatures: 150 to 700 deg C   parabolic trough collectors     typical working temperatures: 150-350 deg C   central receivers  typical working temps: 500-1000deg C
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2 UNIVERSITY OF FLORIDA Solar Utilization Solar Collectors: Typical components (note: not all of these may be used in  some types of collectors, e.g. plastic swimming pool solar  collectors)   glazing   absorber   headers   insulation   container (casing)   heat transfer fluid
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3 UNIVERSITY OF FLORIDA Solar Utilization Collector specifications: Absorber Coating: Flat-Black Paint Gross Area: 23.69 SF, 2.2 meters square Dry Weight: 34 kg, 75 pounds Max. Operating Pressure: 1103 kPa, 160 psig Net Aperture Area: 2.054 meters square, 22.11 SF Fluid Capacity: 3.3 liters, 0.9 gallon Max. Operating Temperature: 99°C, 210°F Collector made from Aluminum framing, Low iron tempered glass, Copper tubing and plating, and Polyisocyanurate insulation. $562 each
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4 UNIVERSITY OF FLORIDA Solar Utilization Solar Collectors: You should review the material, thermal and solar  properties as applicable for each collector component Glazing: transmits shortwave high energy solar radiation to  the absorber plate and blocks the long wave reradiation  from the absorber plate.  Also protects the solar absorber  plate from the environment (rain, dust, etc).   Provides a  “dead” air space above the collector plate to insulate the  top of the plate from convective losses.  Should have large  Τ  for the shortwave energy while having a low  α  and  ρ Should be able to have a high  Τ  at various angles of  incidence. Should be durable and safe to use.  Allow for  multiple layers to provide additional insulating air spaces. 
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lecture_5_solar_utilization - Solar Utilization...

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