A poorly insulated counter-flow double-tube heat exchanger is used to cool ethylene glycol (cp = 2.56...
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A poorly insulated counter-flow double-tube heat exchanger is used to cool ethylene glycol (cp = 2.56 kJ/(kg.K) flowing at a rate of 2 kg/s from 80 to 40 C using water (cp= 4.18 kJ/(kg.K)) that enters at 22 C and leaves at 55 C. The outer surface of the heat exchanger loses heat to the surroundings (Tsurr = 20 C) at the rate of 20 kW. Determine: (a) the rate of heat transfer between the ethylene glycol stream and water stream; (b) the mass flow rate of the water stream; (c) the rate of entropy generation in the heat exchanger. Ethylene glycol inlet Water outlet Outer tube Outer surface of heat exchanger Inner tube water inlet Ethylene glycol outlet Figure 1. Schematic of heat exchanger showing inlet and outlet for water and ethylene glycol. A poorly insulated counter-flow double-tube heat exchanger is used to cool ethylene glycol (cp = 2.56 kJ/(kg.K) flowing at a rate of 2 kg/s from 80 to 40 C using water (cp= 4.18 kJ/(kg.K)) that enters at 22 C and leaves at 55 C. The outer surface of the heat exchanger loses heat to the surroundings (Tsurr = 20 C) at the rate of 20 kW. Determine: (a) the rate of heat transfer between the ethylene glycol stream and water stream; (b) the mass flow rate of the water stream; (c) the rate of entropy generation in the heat exchanger. Ethylene glycol inlet Water outlet Outer tube Outer surface of heat exchanger Inner tube water inlet Ethylene glycol outlet Figure 1. Schematic of heat exchanger showing inlet and outlet for water and ethylene glycol.
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Heat Exchanger Analysis We can solve this problem using the concepts of energy balance and assuming steadystate operation a Rate of heat transfer betw... View the full answer
Related Book For
Thermodynamics An Engineering Approach
ISBN: 978-0073398174
8th edition
Authors: Yunus A. Cengel, Michael A. Boles
Posted Date:
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