Athermally isolated system consists of a hot piece of aluminum and a cold piece of copper. the aluminum and the copper are in thermal contact. the specific heat of aluminum is more than double that of copper. which object experiences the greater amount of heat transfer during the time it takes the system to reach thermal equilibrium? a)the aluminum experiences the greater magnitude of heat transfer. b) the copper experiences the greater magnitude of heat transfer. c) both experience the same magnitude of heat transfer.

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)