Chasefamily
10-19-2016, 03:16 PM
Alright, I have been crunching some numbers to try and understand the throughputs I may achieve depending on how I design my RO and the parts I choose. As of right now it is my understanding that the GPH are mainly determined by the high pressure pumps GPM and the Membrane.
Right now I am looking at the MES 4”x40 membrane that is rated at 2900GPD at 77 deg. I have been told to take a 2.6 reduction for sap that is 36 deg, so that brings that number down to 1115.38 GPD or 46.47 GPH which is at around 100 PSI I believe and will increase as I’ll be running more in the 200 to 250 range.
Also I have seen that the ideal recovery to reach is 15% in one pass or someone state a ratio of 6.7:1 concentrate to permeate. This is correct? Bases on this info I have seen and been told I have done some calculations and wondering if I am in the ball park
The scenarios are done with a 300 Gal @ 2% run and 1 pass
1st one with no recirculation
3.8GPM pump= 3.31 gpm C, .49 P, removes 25 GPH = 1.32 HRS run time to 261.2 Gal 2.47%
4.3GPM pump= 3.73 gpm C, .55 P, removes 33 GPH = 1.16 HRS run time to 261.7 Gal 2.47%
5.4GPM pump= 4.7 GPM C, .70 P, removes 42 GPH = 56 MIN run time to 261.1 Gal 2.47%
75% recirculation
3.8GPM pump= 3.31 gpm C, 2.4825 Rec .49 P, = 3.795 HRS run time to 188.42 Gal 3.42%
4.3GPM pump= 3.73 gpm C, 2.7975 REC .55 P, = 3.37 HRS run time to 188.5 3.42%
5.4GPM pump= 4.7 GPM C, 3.525 REC .70 P, = 2.67 HRS run time to 188 Gal 3.42%
Set RO to 40.8GPH Concentrate out .68GPM
3.8 79% Recirculation 4.27 HRS to 174.2Gal 3.4%
4.3 82% Recirculation 4.065Hrs to 165.85 Gals 3.6%
5.4 85.5% Recirculation 3.623 HRS 147.83 Gal 4.1%
35 GPH .583GPM
5.4 87.6% recirculation 3.897 Hrs. to 136.317 Gals 4.7%
25GPH .4167GPM
5.4 91.1% Recirculation 4.477 HRS to 111.946 gals 5.7%
Max flow for membrane 15GPM
40.8 GPH .68GPM 94.7% recirculation 1.9 HRS run time to 77.52 Gals 8.3%
Alright now that I have put out all the numbers, maybe someone that has a calculator that does this much easier before I make one. In which I am not even sure that I have done them correctly just read through some forums and came up with a bunch of different numbers. I would just like to know the correct calcs before I choose the parts in which I will purchase to build on. At the moment I am thinking a 1hp motor coupled to a procon pump from 265-330 GPH @250 psi and haven’t choose between 1 or 2 membranes as I am worried if I would have enough flow for 2, also think I can make it work without a recirculation pump?
At the Current moment I have about 450 taps on 3/16 nat vacuum and can only boil around 30-40 GPH
Sorry for all the random numbers, it’s kind of a mess. But thanks to anyone that spends the time to read through it, if it can even be understood. Just looking for any bit of help right now that I can.
Right now I am looking at the MES 4”x40 membrane that is rated at 2900GPD at 77 deg. I have been told to take a 2.6 reduction for sap that is 36 deg, so that brings that number down to 1115.38 GPD or 46.47 GPH which is at around 100 PSI I believe and will increase as I’ll be running more in the 200 to 250 range.
Also I have seen that the ideal recovery to reach is 15% in one pass or someone state a ratio of 6.7:1 concentrate to permeate. This is correct? Bases on this info I have seen and been told I have done some calculations and wondering if I am in the ball park
The scenarios are done with a 300 Gal @ 2% run and 1 pass
1st one with no recirculation
3.8GPM pump= 3.31 gpm C, .49 P, removes 25 GPH = 1.32 HRS run time to 261.2 Gal 2.47%
4.3GPM pump= 3.73 gpm C, .55 P, removes 33 GPH = 1.16 HRS run time to 261.7 Gal 2.47%
5.4GPM pump= 4.7 GPM C, .70 P, removes 42 GPH = 56 MIN run time to 261.1 Gal 2.47%
75% recirculation
3.8GPM pump= 3.31 gpm C, 2.4825 Rec .49 P, = 3.795 HRS run time to 188.42 Gal 3.42%
4.3GPM pump= 3.73 gpm C, 2.7975 REC .55 P, = 3.37 HRS run time to 188.5 3.42%
5.4GPM pump= 4.7 GPM C, 3.525 REC .70 P, = 2.67 HRS run time to 188 Gal 3.42%
Set RO to 40.8GPH Concentrate out .68GPM
3.8 79% Recirculation 4.27 HRS to 174.2Gal 3.4%
4.3 82% Recirculation 4.065Hrs to 165.85 Gals 3.6%
5.4 85.5% Recirculation 3.623 HRS 147.83 Gal 4.1%
35 GPH .583GPM
5.4 87.6% recirculation 3.897 Hrs. to 136.317 Gals 4.7%
25GPH .4167GPM
5.4 91.1% Recirculation 4.477 HRS to 111.946 gals 5.7%
Max flow for membrane 15GPM
40.8 GPH .68GPM 94.7% recirculation 1.9 HRS run time to 77.52 Gals 8.3%
Alright now that I have put out all the numbers, maybe someone that has a calculator that does this much easier before I make one. In which I am not even sure that I have done them correctly just read through some forums and came up with a bunch of different numbers. I would just like to know the correct calcs before I choose the parts in which I will purchase to build on. At the moment I am thinking a 1hp motor coupled to a procon pump from 265-330 GPH @250 psi and haven’t choose between 1 or 2 membranes as I am worried if I would have enough flow for 2, also think I can make it work without a recirculation pump?
At the Current moment I have about 450 taps on 3/16 nat vacuum and can only boil around 30-40 GPH
Sorry for all the random numbers, it’s kind of a mess. But thanks to anyone that spends the time to read through it, if it can even be understood. Just looking for any bit of help right now that I can.