Chapter 8, Problem 8.62P

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.

One kg steam expands isentropically from 2.1 MPa and 374 deg C to 93 deg C. Find the final quality of steam.

A piston cylinder containes 0.1 kg air at 100 kpa, 126.85 C which goes through a polytropic compression process with n=1.3 to a pressure of 300 kpa. How much work has the air done in the process? I 8 13 !!

A compressor receives R-410A as saturated vapor R-410A at 400 kPa and brings it to 2000 kPa, 60°C. Then a cooler brings it to saturated liquid at 2000 kPa (see Fig. below). Find the specific compressor work and the specific heat transfer in the cooler? A eccoi = Compressor Compressor section Cooler section

6.123E A piston/cylinder has R-410A at 60 psia and compresses it in a reversible adiabatic process to 400 psia, 200 F. Find the initial temperature. - Sketch and label the process on a T-s diagram and solve.

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

one kg of steam expands isentropically from 2.5mpa and 300 degrees to 0.95mpa.find the final quality and Wn and Ws

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

Helium at 100 kPa, 500 K is in a piston/cylinder setup and is compressed to a final pressure of 800 kPa. Consider helium as an ideal gas with constant specific heat capacities. Find the final temperature and the specific work if the above process is (i) reversible adiabatic (ii) reversible isothermal