Designing 100mbar vacuum system
Posted: Mon Dec 12, 2016 4:40 pm
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
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