In a solar water heater, energy from the Sun is gathered by waterthat circulates
ID: 1727850 • Letter: I
Question
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 29.0%(that is, 71% of the incident solar energy is lost from thesystem). What collector area (in square meters) is necessary toraise the temperature of 430 L of water in the tank from 15°Cto 43°C in 1.2 h when the intensity of incident sunlight is 770W/m2? The specific heat of water is 4186 J/kg·K.The density of water is 1.00 g/cm3.Explanation / Answer
Given ;
The power consumed by the system is
P = ( 1 / 29 % ) * c m T / t