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Engineering, 06.05.2020 02:32 Tianylee2328
Refrigerant 22 in a refrigeration system enters one side of a counterflow heat exchanger at 12 bar, 28 °C. The refrigerant exits at 12 bar, 20 °C. A separate stream of R22 enters the other side of the heat exchanger as saturated vapor at 2 bar and exits as superheated vapor at 2 bar. The mass flow rates of the two streams are equal. Stray heat transfer from the heat exchanger to its surroundings and kinetic and potential energy effects are negligible.
Determine the entropy production in the heat exchanger, in kJ/K per kg of refrigerant flowing. What gives rise to the entropy production in this application?
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Engineering, 04.07.2019 18:20, krojas015
Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?
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Refrigerant 22 in a refrigeration system enters one side of a counterflow heat exchanger at 12 bar,...
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