HTRI learning - Question and Answers

[henj]

how to start with HTRI rating, i mean from start to finish
if requirement is of over design , then go for increasing tube s or shell id ? or any other parameter
where to stop rating ( satisfactorily calculations )
at which stage to start design
please explain with example --- if possible

Start entering all red marked information in the input.. (look in post # 54 - 58 in this thread)
Try some of the examples/samples in HTRI, and experiment by changing the value of the inputs.
Or look in a good book - say in post # 52 in this thread.

To increase the heat transfer / overdesign you may increase flow/velocity (smaller ID shell/tube, less number of tubes, less baffles cut, more baffles ..). Keep a eye at the increasing pressure drop.
You stop calculating when you have satisfactorily transfer, and the heat exchanger is not too big / costly to build and the pressure drop not too high.