The piston-and-cylinder device of Illustration 3.4-7 is to be operated in reverse to isothermally compress the 1 mol of air. Assume that the weights in the illustration have been left at the heights they were at when they were removed from the piston (i.e., in process b the first 50 kg weight is at the initial piston height and the second is at âh = âV/A = 0.384m above the initial piston height). Compute the minimum work that must be done by the surroundings and the net heat that must be withdrawn to return the gas, piston, and weights to their initial states. Also compute the total heat and the total work for each of the four expansion and compression cycles and comment on the results.
This questions uses Illustration 3.4-7 in Sandler's Chemical Engineering Thermodynamics textbook, Edition 4, as a basis for the description of the system and surroundings.
The piston-and-cylinder device of Illustration 3.4-7 is to be operated in reverse to isothermally compress the 1 mol of air. Assume that the weights in the illustration have been left at the heights they were at when they were removed from the piston (i.e., in process b the first 50 kg weight is at the initial piston height and the second is at âh = âV/A = 0.384m above the initial piston height). Compute the minimum work that must be done by the surroundings and the net heat that must be withdrawn to return the gas, piston, and weights to their initial states. Also compute the total heat and the total work for each of the four expansion and compression cycles and comment on the results.
This questions uses Illustration 3.4-7 in Sandler's Chemical Engineering Thermodynamics textbook, Edition 4, as a basis for the description of the system and surroundings.
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