Checked out both the sites engineeringpage.com and processassiciates.com - wealth of info - load of thanks. 25362 is right there is a lot more to a heat exchanger sizing than just 'U'. But those considerations are the job of a heat exchanger vendor. A process design engineer does not go into...
In most cases my transfer area is not so far away from the vendor's - there are tons of software and calculations but what engineering judgement should one take - what ahould be the approach?
thanks
Until now I look up a vendor catalogue and search for U for a heat medium and process conditions - its usually a range. I take the lowest and find the corresponding area required for heat transfer. Is this the best way of doing it? Load of thanks