How can a refrigeration cycle based on the reversed Stirling cycle be devised, and what is the Coefficient of Performance (COP) for this cycle?
a) The cycle includes an isothermal expansion, adiabatic cooling, isothermal compression, and adiabatic heating; COP = Tc/(Th - Tc)
b) The cycle includes an adiabatic expansion, isothermal cooling, adiabatic compression, and isothermal heating; COP = Th/(Th - Tc)
c) The cycle includes an isothermal expansion, adiabatic heating, isothermal compression, and adiabatic cooling; COP = Th/(Th - Tc)
d) The cycle includes an adiabatic expansion, isothermal heating, adiabatic compression, and isothermal cooling; COP = Tc/(Th - Tc)