A constant-pressure piston/cylinder assembly contains 0.2 kg of water as saturated vapor at 400 kPa. It is now cooled so that the water occupies half of the original volume. Find the work and heat transfer for the process.

W= -18.489 kJ

Q= -213.4 kJ

Explanation:

We are given following data for water:  

From "Saturated Water Pressure Entry" table  corresponding to pressure

P = 400kPa we can obtain specific volume and internal energy:  

We can calculate final specific volume from given data in problem:

Work done for constant pressure process is:  

Find specific internal energy is given by:  

We must calculate first dryness fraction:

Specific internal energy is:

Heat transfer is given by:

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going in opposite directions