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A concentric tube heat exchanger for cooling lubri- cating oil is comprised of a thin-walled inner tube of 25-mm diameter carrying water and an outer tube of 45-mm diameter carrying the oil. The exchanger operates in counterflow with an overall heat transfer coefficient of 60 W/m2 · K and the tabulated average properties.
(a) If the outlet temperature of the oil is 60°C, determine the total heat transfer and the outlet temperature of the water.
(b) Determine the length required for the heat exchanger.
An air conditioner can produce a 120 kJ/min cooling effect while rejecting 2.5kW of heat. What is its COP and the electricity it consumes? An inventor claims to have designed a system which can produce the same cooling rate but consumes only 0.05kW e..
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