A piston-cylinder arrangement initially contains water at P=300 psi and T=500 F.

Question

A piston-cylinder arrangement initially contains water at P=300 psi and T=500 F. The piston is moved to a final position where the volume is twice the initial volume. During the piston movement there is a heat transfer to the water in such a way that the pressure in the cylinder remains constant.

a) Find the work per pound of water during the expansion. Answer(80.2 btu/lbm)
b) Find the heat transfer per pound of water during the expansion. Answer(447 btu/lbm)
c) Find the value of the enthalpy of the water after expansion. Answer (1704 btu/lbm)

I know these answers provided are the correct answers but if some could show me how they are obtained I would greatly appreciate it!

Explanation / Answer

Horsepower (hp) is the name of several units of measurement of power, the rate at which work is done. The most common conversion factor, especially for electrical power, is 1 hp = 746 watts. The term was adopted in the late 18th century by Scottish engineer James Watt to compare the output of steam engines with the power of draft horses. It was later expanded to include the output power of other types of piston engines, as well as turbines, electric motors and other machinery.[1][2] The definition of the unit varied between geographical regions. Most countries now use the SI unit watt for measurement of power. With the implementation of the EU Directive 80/181/EEC on January 1, 2010, the use of horsepower in the EU is only permitted as supplementary uni

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