In the last part of chapter 8, question 6, part d, it asks for the mass flow rat

Question

In the last part of chapter 8, question 6, part d, it asks for the mass flow rate of the condenser cooling water if the cooling water undergoes a temperature increase of 18C and constant pressure.

I follow the rest of the solution given in the textbook help, but I'm completely at a loss of where the solution for step 9 comes from. First, I don't know where mwCp?Tw=ms(h2-h3) equation came from. Next, I don't know why 300K is chosen when the saturation temp appears to be 315K at 0.08bar, where I would interpolate between 300K and 325K to get the Cp value (although I was able to find the Cp value for 300K in the back of the book.)
I really to know specifically how to do this, and preferably referring to a section in the book, since there is a similar question in problem 8.22 I follow the rest of the solution given in the textbook help, but I'm completely at a loss of where the solution for step 9 comes from. First, I don't know where mwCp?Tw=ms(h2-h3) equation came from. Next, I don't know why 300K is chosen when the saturation temp appears to be 315K at 0.08bar, where I would interpolate between 300K and 325K to get the Cp value (although I was able to find the Cp value for 300K in the back of the book.)
Next, I don't know why 300K is chosen when the saturation temp appears to be 315K at 0.08bar, where I would interpolate between 300K and 325K to get the Cp value (although I was able to find the Cp value for 300K in the back of the book.) I really to know specifically how to do this, and preferably referring to a section in the book, since there is a similar question in problem 8.22

Explanation / Answer

I know where the equation came from, it's chapter 3, equation 3.20 I still disagree that the 300K should be used.

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