Shell and tube heat exchanger, correlation
Shell and tube heat exchanger, correlation
(OP)
Hi there
hope you are fine.
please, I am contacting you for following topic.
Please, I would like to know if someone can suggest me a correlation for a following case
- shall and tube heat exchanger
- finned tube
- water as external medium.
I'd like to calculate the external heat transfer coefficient.
I assume it would be a correlation including a Reynolds number.
In this case, it would be interesting to know which is the dimensional characteristic considered in this number
Would it be possible to know any value, as indicative, in order to have a rule of thumb ?
I have really digged into the web, but I have not been able to find any clear answer
Thanks !
hope you are fine.
please, I am contacting you for following topic.
Please, I would like to know if someone can suggest me a correlation for a following case
- shall and tube heat exchanger
- finned tube
- water as external medium.
I'd like to calculate the external heat transfer coefficient.
I assume it would be a correlation including a Reynolds number.
In this case, it would be interesting to know which is the dimensional characteristic considered in this number
Would it be possible to know any value, as indicative, in order to have a rule of thumb ?
I have really digged into the web, but I have not been able to find any clear answer
Thanks !





RE: Shell and tube heat exchanger, correlation
RE: Shell and tube heat exchanger, correlation
thanks for your answer.
I apologize for not being clear enough, so that I will try to explain me better.
Indeed my question was not concerning LMTD, but
Q = UA*LMTD
Q is the heat exchanger capacity
A is the reference area
LMTD is logatitmic mean temperature
Specifically
U = 1/h_ext + 1/hint(d_ext/d_int)+(d_ext/2)*ln(d_ext/d_int)/Tube_conductivity
where
h is the heat transfer coefficient (ext stands for external, int for internal)
d is the tube diameter
said this, I'd kindly need a correlation for h_ext.
Thanks in advance for your help !
RE: Shell and tube heat exchanger, correlation