FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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A condenser (heat exchanger) brings 1 kg/s water flow at 10 kPa quality 95% to saturated liquid at 10 kPa. The cooling is done by lake water at 20 degree Celsius that returns to the lake at 30 degree Celsius. For an insulated condenser, find the flow rate of cooling water.
4. An evaporator has R-410A at -20°C and quality 80% flowing in. The exit flow is saturated vapor at
-20°C.
a. Consider the heating to be a reversible process and find the specific heat transfer from the
entropy balance. (Answer: 48.7 kJ/kg)
b. If the heat source was at -10°C and the inlet and outlet streams still have the same properties as
in a), calculate the specific entropy generation? (Answer: 7.33 J/(kg K))
In a spray condenser, find the ratio of circulating water to
steam flow if the condenser pressure is (0.06 bar), and the
cooling tower cools the water to (15ºC). Assume turbine
exhaust at (88%) quality.
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What is entropy? - Jeff Phillips; Author: TED-Ed;https://www.youtube.com/watch?v=YM-uykVfq_E;License: Standard youtube license