Location of CW control valve
Location of CW control valve
(OP)
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)
CW = (Cooling water)





RE: Location of CW control valve
RE: Location of CW control valve
RE: Location of CW control valve
RE: Location of CW control valve
You may want to control the top pressure of a distillation column and have the possibility to change it, depending on the feed.
Our debutanizer has variable pressure and we control the pressure by a CW control valve in the condenser but it is the only case in an entire steam cracker plant.
However, fouling problems, depending on the water quality you have can be severe, mainly corrosion if the CW velocity are low.
AndreChE
RE: Location of CW control valve
RE: Location of CW control valve
I have used VSD's on pumps feeding heat exchangers on both sides with success. It all depends on your system. Can you give more information on the system?
RE: Location of CW control valve
Now take this manual approach and add controls to the outlet butterfly and its 100% automated. In reality the should be a need to automate this but go ahead. If you really want to get exotic, measure the pressure drop of water across the exchanger and control that instead of the DP across an orifice.
RE: Location of CW control valve
Throttling downstream may be needed when the HE unit is located at such an elevation that the return water pipe is in a vacuum; in which case dissolved air may be released impairing heat transfer.
RE: Location of CW control valve
RE: Location of CW control valve
RE: Location of CW control valve