Transcript Solar Thermal Systems ME 252 Thermal-Fluid Systems

Solar Thermal
Systems
ME 252
Thermal-Fluid Systems
G. Kallio
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Types of Solar Collectors
for Thermal Systems
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Commercial vs. residential
Passive vs. active
Flat-plate
Evacuated tube
Concentrating
Tracking
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Solar Thermal
Applications
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Water heating
Space heating
A/C and heat pumps
Power generation
Evaporation/distillation
Sewage treatment
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Flat-plate Collector
Design
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Collector orientation
Glazing material selection
Air gap
Absorber surface selection
Fluid selection
Fluid flow rate
Conduit size, configuration
Insulation
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Collector Performance
• Define collector efficiency:
c 
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useful heat rate delivered to fluid
incident solar energy rate
Q
u
Gsun Ac
m c p Tmo  Tmi 
Gsun Ac
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