SolarSolns - Design of Alternative Energy Systems Solar...

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1 ME 417 Design of Alternative Energy Systems Solar Energy Problem Solutions 1. A concentrated solar collector is used to heat air from 10 ° C to 35 ° C. If the collector area is 50 m 2 and the concentrator efficiency is 83%, determine the flow rate of air (in cfm) that can be provided. The following properties may be assumed: incident solar radiation: 325 W/m 2 specific heat of air: 1005 J/(kg K) density of air: 1.15 kg/m 3 Solution: For a concentrated solar collector, we have the heat delivered to the focal point given as i col conc H G A Q η = Then an energy balance on the air running through the focal point must be ) T T ( c m Q in out P H - = Equating this two expressions i col conc in out P G A ) T T ( c m η = - and solving for the mass flow rate 537 . 0 ) 10 35 )( 1005 ( ) 325 )( 50 )( 83 . 0 ( ) T T ( c G A m in out P i col conc = - = - η = kg/s Converting to volume flow rate we have 467 . 0 15 . 1 537 . 0 m V = = ρ = m 3 /s or 793 cfm 2. Water enters a flat plate solar collector with two cover glasses at 0.10 kg/s and 40 ° C. Determine the exit water temperature for a collector area of 20 m 2 operating under the following conditions:
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SolarSolns - Design of Alternative Energy Systems Solar...

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