1. A solar water heater for domestic hot-water supply uses solar collecting panels with a collection efficiency of 60% in a location where the average solar-energy input is 200 W/m2. If the water comes into the house at 68.00 F and is to be heated to 140.00 F, what volume of water can be heated per hour if the area of the collector is 30.0 m2?

2. In one cycle, a freezer uses 785 J of electrical energy in order to remove 1750 J of heat from its freezer compartment at 100 F.

What is the coefficient of performance of this freezer?

How much heat does it expel into the room during this cycle?