A refrigerator/heat pump cycle transfers heat, QL, from a low-temperature region at TL and delivers a quantity of heat QH, to a high temperature region at TH. By energy balance on the cycle, the work input, Win, is given by
a. QH-QL
b. (QH-QL)/QH,
c. QL-QH/QL
d. QH/QL
e. QL-QH