**Finding the correct 'Length' of a pipe?**
Hello again, i've been struggling with question a) for a few days now and I have now reached a cross-road. The problem in itself lays in the framing of the question. So if you would take a look at the question in the attached document you will see that my professor is asking for the required 'Length' in order to heat the water from 20(C) to 80(C) degrees Celcius.
However, he also includes in the question,
"Heat transfer coefficient and **pressure loss** can be calculated by correlative equations in the above table."
Why would I need pressure loss? I found a formula to get the length, and it's
Q=k*A*ΔT(lm)
k = heat transfer coefficient
A = heat transfer area (of pipe) = **L *** [pi*(d(outer)^2-d(inner)^2)]/4
ΔT(lm) = Log mean temperature difference
I assumed this 'Length (L)' would be the one in question to find. Since it actually has a temperature included. But I looked up the formula for 'pressure loss' and apparently I can get a Length (L) that way as well. Is that what my professor is asking for? Are they the same lengths? Why do I need the pressure loss to solve this question? Did he mean to include it in question b) perhaps?
Thank you in advance.
/Kalle
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Last edited by Kalle123; Feb 8th 2019 at 12:07 PM.
Reason: Decided to ask a specific question.
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