Chapter 8, Problem 8.95P

Two rigid tanks are filled with water. Tank A is 0.2 m³ at 100 kPa, 150°C and tank B is 0.3 m³ at saturated vapor 300 kPa. The tanks are connected by a pipe with a closed valve. We open the valve and let all the water come to a single uniform state while we transfer enough heat to have a final pressure of 300 kPa. Give the two property values that determine the final state and find the heat transfer. B A

A compressor has R-134a entering at 10°C, 100 kPa and exiting as a saturated vapor. It is given that this particular compressor also involves heat loss (i.e., this compressor, in a non-typical fashion, has a non- zero q; i.e., you cannot neglect q for this compressor). If the compressor operates in a reversible isothermal manner, find the specific heat transfer and specific work.

A factory generates compressed air from 100 kPa, 17°C by compression to 800 kPa, 500 K, after which it cools in a constant pressure cooler to 300 K, (see Fig. P4.36). Find the specific compressor work and the specific heat transfer in the cooler. 1 2 3 Compressor -w. Compressor section Cooler section

THERMODYNAMICS A certain gas expand from 7ft3 to 23ft3 while the pressure remains constant at 17.5psia. Find the work nonflow in the system in BTU.

Q2) A piston/cylinder has ammonia at 1600 kPa, 100°C with a volume of 0.1 m3. The piston is loaded with a linear spring and outside ambient is at 20 °C. The ammonia now cools down to 10 °C at which point it has a quality of 10%. Find the work, the heat transfer and the total entropy generation in the process. NH₂

Q2: One mole of air at P: and temperature Ti is compressed at constant volume till its pressure doubled. Then it is allowed to expand reversibly and isothermally to the original pressure and finally restored to the originol temperature by cooling at constant pressure. Sketch the processes on a P-V and calculate the net work done by the

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The 1 lb of air has decrease of internal energy of 20.58 Btu while its Fahrenheit temperature is reduced to 1/3 of the initial temperature during a reversible nonflow constant pressure process. Find 1).the initial and final temperatures, 2). heat 3).work

100 kg/min of steam at 43 bars, 360 °C expands through a turbine isentropically until the pressure becomes 0.35 bars. Find the work in hp.