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Air Cooler UA Value when it rains (Evaporative Cooler)

Air Cooler UA Value when it rains (Evaporative Cooler)

Air Cooler UA Value when it rains (Evaporative Cooler)

(OP)
Hi,

I have an air cooled heat exchanger that is partially condensing a water/gylcol mixture.  We have concerns that, when it rains, the partial condenser will turn into a total condenser and as such will reduce the pressure in the overheads line.

Basically, the exchanger will change from being a standard air cooler to being a wet surface air cooler (ie. an evaporative air cooler).

We are going to simulate this effect (using Hysys.Plant) however I need to know how much the UA will increase when it rains.

Noraml U value is 31.0W/m2°C with a finned area of 436.6m2.

Thanks for your help,
Paul

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