HTRI calculation of shell-and-tube heat exchangers
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Using HTRI to calculate the shell-and-tube heat exchanger, with the cold fluid flowing through the inner tubes and the hot fluid flowing through the annular space, the calculated tube length is 20 meters. My design calls for a tube with a length of 4 meters; therefore, it should be multiple tubes connected in series, with each tube joined by elbows. However, according to the diagram, it appears to be a single tube with a length of 20 meters. So I changed the configuration to series, set the series value to 5, and performed another calculation; the material properties shown in the report changed – the specific heat became 5 times higher than before, and the thermal load increased significantly. Why is this? I need expert advice.
It might be better to upload the file.
Changes in pressure cause changes in physical properties, right?
If the flow rate is high, it is not necessarily necessary to use a configuration with multiple coaxial sleeves in series. It can also be a multi-tube shell-and-tube heat exchanger in which multiple tubes are arranged within an outer shell, namely the so-called “hair pin” type of shell-and-tube heat exchanger as referred to in HTRI and similar contexts.