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What about a shut off valve instead of a control valve?

Which would be the ideal position to put a control valve on the CW to a heat exchanger? Does it make a difference if the valve is at the inlet or outlet of the CW line.The heat exchanger in question is a carbon block type. CW = (Cooling water)

We use aluminium buttons to make a polyamine. Temperatures are in the range of 60 - 120 deg.C. Recently we've been having problems with slow reaction times and have identified the Al buttons as the cause of the problem. The aluminium button has an oxide layer. We want to have a quick test so...

I have 2 heat exchangers which are connected in series.The only info I have about them is their heat transfer area.How can I go a pressure drop calculation over them?The product comes from a reactor ,goes through the heat exchangers and is pumped back into the reactor.

Thanks, but if the pipe is running full what then?

I have a sloped pipe that gravity drains to a collection pot.How do I go about calculating the pressure drop over this line? Do I first use Manning's equation to get the velocity and then darcy to calculate the pressure drop? Thanks