A heat pump has heat-transfer addition at 280 K and heat transfer out at 420 K, and the heat-transfer rate out at 420 K is 900 kJ/min. For each case below, determine from both the Clausis inequality and the Carnot principle for a heat pump whether the cycle is reversible, irreversible or impossible.
a. QL=580 KJ/min
b. W=280 KJ/min
c. QL=600 KJ/min