Water vapor initially at 3.0 MPa and 300ºC (state 1) is contained within a piston-cylinder device. The water is cooled at constant volume until its temperature reaches 200ºC (state 2). The water is then compressed isothermally to a state where the pressure is 2.5 MPa (state 3). Sketch this process on T-v and P-v diagrams and determine the specific volume at all three states and the quality at state 2.

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.