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Adding equations 12 and 3
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(14) |
By assuming  as independent of l and integrating over the length l we get.
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(15) |
Expression relates terminal temperatures of the heat exchanger to stream rates and heat exchanger dimensions.
It can be used to describe the performance of the exchanger By equation 8, 9 and 15
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(16) |
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(17) |
The equations 16 and 17 describe the rate of heat flow as a function of the terminal temperatures of the heat exchanger and do not contain the manner in which streams are flowing. Therefore, the equations 16 or 17 are general equations to evaluate the performance of the heat exchanger
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