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23 Nov 2019
In a solar water heater, energy from the Sun is gathered by waterthat circulates through tubes in a rooftop collector. The solarradiation enters the collector through a transparent cover andwarms the water in the tubes; this water is pumped into a holdingtank. Assume that the efficiency of the overall system is 30.0%(that is, 70% of the incident solar energy is lost from thesystem). What collector area (in square meters) is necessary toraise the temperature of 290 L of water in the tank from 17°C to47°C in 2.2 h when the intensity of incident sunlight is 690 W/m2?The specific heat of water is 4186 J/kg·K. The density of water is1.00 g/cm3.
In a solar water heater, energy from the Sun is gathered by waterthat circulates through tubes in a rooftop collector. The solarradiation enters the collector through a transparent cover andwarms the water in the tubes; this water is pumped into a holdingtank. Assume that the efficiency of the overall system is 30.0%(that is, 70% of the incident solar energy is lost from thesystem). What collector area (in square meters) is necessary toraise the temperature of 290 L of water in the tank from 17°C to47°C in 2.2 h when the intensity of incident sunlight is 690 W/m2?The specific heat of water is 4186 J/kg·K. The density of water is1.00 g/cm3.
