sizing a dehumidifier

[henegg]

hello

I have a drum dryer that uses steam to evaporate off the moisture in the product we dry. we are installing a similar dryer and wish to use a rotoclone to dehumidify the exhaust air. we know the moisture of the product going in and the moisture of the product out. I do not know the actual exheaust temp or relative huity.
We know the surface of the exhaust duct is 150F. We also have been told the ehaust air volume needs to be 6 times the water vapor volume.

How can we determine the inputs need to size the rotoclone.
Can we assume the air is saturated off the drier.
I sure would like some guidance to start designing this process.

thanks

 

[KiwiMace]

You seem to be redesigning an existing once-through process into a recirculating process.

1. The air flow if not known, should be easily measured or read off a fan tag.
2. There is an easily determined moisture generation rate if you know your production rate.
3. The rotoclone equipment will have certain operating limits. Find out what these are - temp, airflow, moisure removal etc. Rough in the equipment capacity based on what you have already.
4. Plot the process on a psych chart and see if it is practical, or the airflow can be changed to reduce the equipment size and still remove the moisture. High temp chart required.
5. Iterate around the parameters you can change. You will want to avoid condensation, but minimise unnecessary heat removal and cost. Use the lowest airflow that will not saturate in the worst (most, coldest) production rate.

The water vapour volume is the same as air volume because both will equal the container volume.