Twenty pounds of air initially at 1560°R, 3 atm fills a rigid tank. The air is cooled to 1040°R, 2 atm. For the air modeled as an ideal gas: a) Indicate the initial state, final state, and dead state on a T-v diagram b) Determine the heat transfer, in Btu c) Determine the change in exergy, in Btu, and interpret the sign using the T-v diagram of part (a) Let To = 520°R, Po = 1 atm and ignore the effects of motion and gravity.

Fast.

Need help with these two homework problems 1) A tank contains a two-phase liquid–vapor mixture of Refrigerant 22 at 8 bar. The mass of saturated liquid in the tank is 25 kg and the quality is 30%. Determine the volume of the tank, in m3, and the percentage of the total volume occupied by saturated vapor.           2) One kilogram of water contained in a piston–cylinder assembly, initially saturated vapor at 100 kPa, is condensed at constant pressure to saturated liquid. Consider an enlarged system consisting of the water and enough of the nearby surroundings that heat transfer occurs only at the ambient temperature of 25oC. Assume the state of the nearby surroundings does not change during the process, and ignore kinetic and potential energy effects.  For the enlarged system, determine the heat transfer, in kJ, and the entropy production, in kJ/K.

letter d