Two constant-volume tanks, each filled with 30 kg of air, have temperatures of 900 K and 300 K. A heat engine placed between the two tanks extracts heat from the high-temperature tank, produces work, and rejects heat to the low-temperature tank. Determine the maximum work that can be produced by the heat engine and the final temperatures of the tanks. Assume constant specific heats at room temperature.

Why does a nonquasi-equilibrium compression process require a larger work input than the corresponding quasi-equilibrium one?

The compressor in a refrigerator compresses saturated R-134a vapor at 0°F to 200 psia. Calculate the work required by this compressor, in Btu/lbm, when the compression process is isentropic. Use the tables for R-134a. The work required by this compressor is Btu/lbm.

In a gas turbine, the temperature of the working fluid at inlet to the compressor is 289 K and outlet 438 K. At inlet to the turbine, the working fluid has a temperature of 1,064 K and exhausts from the turbine at a tempeature of 739 K. The specific heat capacity of the working fluid at constant pressure is 1.005 kJ/kg.K. Determine the efficiency of the plant

When a man returns to his well-sealed house on a summer day, he finds that the house is at 35°C. He turns on the air conditioner, which cools the entire house to 20°C in 36 min. If the COP of the air-conditioning system is 2.8, determine the power drawn by the air conditioner. Assume the entire mass within the house is equivalent to 800 kg of air for which cy= 0.72 kJ/kg °C and cp = 1.0 kJ/kg-°C. 35°C 20°C W A/C The power drawn by the air conditioner is kW.