The solar battery (20 x 20 cm) is exposed to a sun light and during its function is heated up to Ts=50C. The wind is blowing over the flat surface of the battery with the velocity of 5 m/s. Ambient air temperature is 20C

Aheat pump using refrigerant-134a heats a house by using underground water at 8°c as the heat source. the house is losing heat at a rate of 60,000 kj/h. the refrigerant enters the compressor at 280 kpa and 0°c, and it leaves at 1 mpa and 60°c. the refrigerant exits the condenser at 30°c. determine: (a) the power input to the heat pump, (b) the rate of heat absorption from the water, and (c) the increase in electric power input if an electric resistance heater is used instead of a heat pump