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R-134a is throttled from 1200kPa and 40oC to 200kPa. It is known that heat of 5kJ/kg is lost from R-134a to the surroundings at 20oC. Determine (a) the enthalpy of R-134a at the exit; (b) the temperature at exit; (c) the entropy of R-134a at the exit; and (d) the entropy generation.
a u manometer reads 20 cm air as operating fluid and a given manometric fluid. a single branch closed tube reads 35 cm
25 washers have a combined mass of 1 lb. how much money is recovered per day from the sale of scrap washers?
compare air and helium as cooling media for electronic devices. both fluids must exit through an area of 0.025 m2. the
a cylinder contains 2 kg of steam at 200 kpa and 200 c. the steam is compressed at constant pressure until its
10 kg of water in a piston-cylinder arrangement exists as saturated liquidvapor at 100 kpa with a quality of 50. it is
Air at 90 kpa and -7 C enters an adiabatic diffuser steadily with a velocity of 180 m/s and leaves with a low velocity at a pressure of 100 kpa. The exit area of the diffuser is 5 times the inlet area. Determine (a) the exit temperature and (b) th..
the thickness of a set of gaskets varies because of random manufacturing disturbances but the thickness values measured
1. Natural gas and 100% excess air enter the combustion chamber of the Capstone micro-gas turbine at 400 kPa and 452 °C.
a gas turbine has a pressure ratio of 15. it is connected to an electric generator with an efficiency of 95. the
A small droplet of liquid detergent, falling through air in a spray drying tower, has its diameter reduced as water evaporates from the surface. If we assume that the temperature of the liquid within the drop remains at 290 K and the dry air is at..
a civil engineer is designing a pipe to transport 178 m3s of water a distance of 4.35 x 104 m. to save capital costs he
derive a relationship between partial molar excess enthalpy activity coefficient of species i and temperature. assume
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