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A large condenser (heat exchanger) in a power plant must
Chapter 3, Problem 63HP(choose chapter or problem)
Problem 63HP
A large condenser (heat exchanger) in a power plant must transfer a total of 100 MW from steam running in a pipe to seawater being pumped through the heat exchanger. Assume that the wall separating the steam and seawater is 4 mm of steel, with conductivity of 15 W/m K, and that a maximum 5°C difference between the two fluids is allowed in the design. Find the required minimum area for the heat transfer, neglecting any convective heat transfer in the flows.
Questions & Answers
QUESTION:
Problem 63HP
A large condenser (heat exchanger) in a power plant must transfer a total of 100 MW from steam running in a pipe to seawater being pumped through the heat exchanger. Assume that the wall separating the steam and seawater is 4 mm of steel, with conductivity of 15 W/m K, and that a maximum 5°C difference between the two fluids is allowed in the design. Find the required minimum area for the heat transfer, neglecting any convective heat transfer in the flows.
ANSWER:
Solution 63 HP:
Step 1 of 2:-
Here we have to find the minimum required area for the heat transfer.
The total heat transfer is given as,
The thickness of the wall is,
.
The conductivity is given as,
.
But we know that, the coefficient of heat transfer can be written as,
The temperature difference is given as,
.
This is because the temperature difference in celsius and kelvin scale is same.