Designing 100mbar vacuum system

Every fusor and fusion system seems to need a vacuum. This area is for detailed discussion of vacuum systems, materials, gauging, etc. related to fusor or fusion research.
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Peter Pakos
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Designing 100mbar vacuum system

Post by Peter Pakos » Mon Dec 12, 2016 9:40 pm


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?


Jerry Biehler
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Re: Designing 100mbar vacuum system

Post by Jerry Biehler » Tue Dec 13, 2016 12:52 am

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. ... ion_LR.PDF

John Futter
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Re: Designing 100mbar vacuum system

Post by John Futter » Tue Dec 13, 2016 5:47 am

You seem to have missed the rules section
Please change your logon and real name entries to your real full name
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