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SolarProbs

# SolarProbs - 2 ⋅ K air and surrounds temperature 280 K...

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1 ME 417 Design of Alternative Energy Systems Solar Energy Problems 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 2. Water enters a flat plate solar collector with two cover glasses at 0.10 kg/s and 40C. Determine the exit water temperature for a collector area of 20 m 2 operating under the following conditions: incident solar radiation: 275 W/m 2 solar absorbtivity of the collector: 0.93 infrared emissivity of the collector: 0.89 fraction of collector in contact with water: 0.75 specific heat of water: 4200 J/(kg K) convective heat transfer coefficient of water: 65 W/(m

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Unformatted text preview: 2 ⋅ K) air and surrounds temperature: 280 K air convective heat transfer coefficient of water: 2 W/(m 2 ⋅ K) air gap convective heat transfer coefficient of water: 0.8 W/(m 2 ⋅ K) 3. A decision is to be made as to what solar collector to purchase for an application. An analysis of both collectors yields: Collector Type Required Area No Cover Glass 75 m 2 Evacuated 55 m 2 If the no cover glass collectors cost \$63 per m 2 , determine the unit cost of the evacuated collector that will make it competitive with the no cover glass collector. ME 417 Design of Alternative Energy Systems 2 4. Determine the area required of a 100 m2 Mono-Si PV module operating under the following conditions: Solar Radiation Flux: 200 W/m 2 Electric Power: 0.5 kW Ambient Temperature: 20 ° C Latitude: 40 ° Declination Angle: 8 ° Tilt Angle: 35 ° Clearness Index: 0.5...
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SolarProbs - 2 ⋅ K air and surrounds temperature 280 K...

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