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Designing 100mbar vacuum system

Posted: Mon Dec 12, 2016 4:40 pm
by Peter Pakos
Hi,

I´m student of fluid engineering and in my diploma thesis I´m trying to design vacuum system which can evaporate 270kg/h of water at 50°C. I have studied physical laws of this topic but I have a lot of questions about this.

First question: Can I consider there is only water steam in system? Because my teacher told me that I should, but I think that would be ideal case and in every litteratury I had red was considering also air with steam .
Second: I suppose that using only water ring vacuum pump wouldn´t be so smart, because in that case I have to use very big vacuum pump which produce a lot of condense in it and the temperature difference of the service liquid would be about 38°C. I wonder use some condenser befor vacuum pump but I´m not sure how to select right one and how to calculate some parameters of it to create 100mbar vacuum. Then I would like to find out ratio of condensate and vapour . To evacuate vapour from condenser I would use small vacum pump. Is that possible? Could you give me a little advice about calculation or about rules of the designing this kind of system?

Thanks
Peter

Re: Designing 100mbar vacuum system

Posted: Mon Dec 12, 2016 7:52 pm
by Jerry Biehler
Water rings are good for dirty vacuum situations but are limited to the vapor pressure of the sealing liquid.

Just look up what they use for freeze drying. I am assuming you dont actually need to build it.

https://www.edwardsvacuum.com/uploadedF ... ion_LR.PDF

Re: Designing 100mbar vacuum system

Posted: Tue Dec 13, 2016 12:47 am
by John Futter
Peter
You seem to have missed the rules section
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