A flat plate solar collector (2m x 3 m) is installed on a horizontal roof of...
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A flat plate solar collector (2m x 3 m) is installed on a horizontal roof of a house, located in Oslo. The collector surface is tilted 35 degree from the horizontal and pointed 10 degree west of south. In a sunny day with an ambient temperature of 25 °C and solar intensity on the surface of the collector of 800 W/m², a glycol-water mixture (Cp=3.95 kJ/kg K) enters the collector at 10 °C and leaves at 70 °C. The collector is well insulated on the sides and backside. Manufacturing data of the collectors gives the following information: a) b) c) d) e) f) g) • n= 0.78 a₁ 3.5 W/m² K ● a2= 0.012 W/m² K² ● Calculate the angle of incident of solar radiation on the 18th June at 14:30 solar time [degree]. For question a, calculate the ratio of solar radiation between an inclined and a horizontal solar collector [-]. Comment on the answer. Calculate the solar intensity on the surface of the collector if the collector is placed on a horizontal position [W/m²]. Calculate the thermal efficiency of the collector [%]. How much is the optical efficiency of the collector [%]? Mention two methods to improve the optical efficiency. Calculate the heat loss coefficient of the collector [W/m² K]. Calculate the mass flow rate of glycol-water mixture [kg/s]. A flat plate solar collector (2m x 3 m) is installed on a horizontal roof of a house, located in Oslo. The collector surface is tilted 35 degree from the horizontal and pointed 10 degree west of south. In a sunny day with an ambient temperature of 25 °C and solar intensity on the surface of the collector of 800 W/m², a glycol-water mixture (Cp=3.95 kJ/kg K) enters the collector at 10 °C and leaves at 70 °C. The collector is well insulated on the sides and backside. Manufacturing data of the collectors gives the following information: a) b) c) d) e) f) g) • n= 0.78 a₁ 3.5 W/m² K ● a2= 0.012 W/m² K² ● Calculate the angle of incident of solar radiation on the 18th June at 14:30 solar time [degree]. For question a, calculate the ratio of solar radiation between an inclined and a horizontal solar collector [-]. Comment on the answer. Calculate the solar intensity on the surface of the collector if the collector is placed on a horizontal position [W/m²]. Calculate the thermal efficiency of the collector [%]. How much is the optical efficiency of the collector [%]? Mention two methods to improve the optical efficiency. Calculate the heat loss coefficient of the collector [W/m² K]. Calculate the mass flow rate of glycol-water mixture [kg/s].
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a To calculate the angle of incidence of solar radiation on the 18th of June at 1430 solar time in Oslo we need to consider the solar position The solar position can be determined using astronomical a... View the full answer
Related Book For
Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn
Posted Date:
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