Is it feasible to calculate the total heat exchange area based on the area of each tube?
Thread Content
Imagine if you calculate the area of one tube and then multiply that area by the total number of tubes – would that give the total heat exchange area?
Yes. However, losses such as the thickness of the tube sheet should also be deducted.
Isn’t it all calculated this way (by deducting the tube sheet thickness and protrusion length)?
I think what the original poster meant is after the deductions have been made; that’s how it should be calculated.
Thinking backwards, how did you determine the number of heat exchange tubes? It’s the same principle; I don’t know why the original poster suddenly can’t understand it!
This gentleman reminded me of how you determined the number of heat exchange tubes The conventional heat exchange area is calculated based on the heat transfer coefficient K, using the formula A=Q/K*△t (which can be considered an initial estimate of the heat exchange area). Based on this value, the length and diameter of the tubes are determined; finally, the heat exchange area is calculated using the diameter, length, and number of tubes, via the formula A=2π*d*l*n
Of course. When designing a heat exchanger, it’s necessary to calculate the heat flux and then determine the heat exchange area; the number of tubes is determined based on that heat exchange area
To find the total heat exchange area, you just need to subtract the sum of the thicknesses of the two tube sheets and the protrusion length
Note: if it is a U-tube heat exchanger, only calculate the area of the straight tube sections!