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  1. #898
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    Quote Originally Posted by heatingman View Post
    I figure the recovery machine can move about 1/2 lb of gas per minute pulling vapor.

    How does one calculate btu capacity from that?


    Sent from my iPhone using Tapatalk
    The REAL way to do it would be to take your recovery machine displacement, then multiply it by the correction factor for the given (absolute) pressure ratio, then subtract the enthalpy of the liquid pressure from the suction pressure and multiply by the mass flow rate.

    But I suppose if you want to be lazy about it, just lookup the difference in enthalpy of the suction and discharge pressures of your pump and multiply by your 1/2lb.

    OR.....

    Measure the temperature drop of the water over a period of time.

    Sent from my Moto Z (2) using Tapatalk

  2. #899
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    Quote Originally Posted by mark beiser View Post
    Nerds!
    https://youtu.be/7a_sx3ozoXI

    Sent from my Moto Z (2) using Tapatalk

  3. #900
    Join Date
    Aug 2006
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    Mixing oil and fire with a big spoon.
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    Quote Originally Posted by mark beiser View Post
    Nerds!
    Hey Mark. I think my wife hijacked your account.
    Don't step on my favorite part of the Constitution just to point out your favorite part.

    Political Correctness is forced on you because you have forgotten decency.

    Technically speaking, they are all heat pumps.

  4. Likes shellkamp, heatingman liked this post
  5. #901
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    Quote Originally Posted by heatingman View Post
    I think with a better metering device, and evap, this concept might work for the prime mover for a refrigerated cold trap.

    Right now, Im just using a ball valve set to about ‘meh’ maintaining a 5 degree saturation temp on the suction line. Evap is just one of those CPS “molecular tranformators”

    -Recovery machine being the prime mover.

    And running on around 10 oz of 404a, Ive dropped about 4 gallons of water 14 degrees in a 1/2 hr or so.




    Sent from my iPhone using Tapatalk
    once the temperature drops close to freezing, you are going to lose moisture removal capacity really quickly. Consider using rubbing alcohol. I was using that for our cold trap and I could get it down under -90F and still be a liquid.
    Don't step on my favorite part of the Constitution just to point out your favorite part.

    Political Correctness is forced on you because you have forgotten decency.

    Technically speaking, they are all heat pumps.

  6. #902
    Join Date
    Dec 2004
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    Thread Starter
    Quote Originally Posted by jayguy View Post
    once the temperature drops close to freezing, you are going to lose moisture removal capacity really quickly. Consider using rubbing alcohol. I was using that for our cold trap and I could get it down under -90F and still be a liquid.
    I was just using the water to see if the recovery machine could do some “work”

    Im gonna try to make a cold wall evap coil attached to the inside of the cold trap - so the evacuated air would be in direct contact with that. No water other then whatever condenses onto the cold wall would be involved.


    Sent from my iPhone using Tapatalk

  7. #903
    Join Date
    Mar 2007
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    In the Conservatory with a Lead Pipe
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    Have you soldered copper to stainless before? Staybrite 8, liquid flux and a soldering iron will do it.

  8. #904
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    Thread Starter
    Quote Originally Posted by itsiceman View Post
    Have you soldered copper to stainless before? Staybrite 8, liquid flux and a soldering iron will do it.
    Yes. I have, but not quite like this. Usually its pipe to pipe, and Ive used 45%

    But I like the staybrite idea.


    Sent from my iPhone using Tapatalk

  9. #905
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    That's how we do cold plates.

  10. #906
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    Thread Starter
    How big of a soldering iron? Surely not a little electronics one.


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  11. #907
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    Quote Originally Posted by heatingman View Post
    How big of a soldering iron? Surely not a little electronics one.


    Sent from my iPhone using Tapatalk
    Don't be a pansy. Use a mapp-gas torch.

    Sent from my Moto Z (2) using Tapatalk

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  13. #908
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    Quote Originally Posted by heatingman View Post
    How big of a soldering iron? Surely not a little electronics one.


    Sent from my iPhone using Tapatalk
    I've used 2
    One too hot one too cold. Just a guess right now but they may have been a 600 W and 1000 W
    Mapp gas might be just right lol

  14. #909
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    Im thinking something similar to this for the body of the trap, or just an old reclaim cylinder that has two taps on the top, and one added at the base but that would be a fair amount of welding, and cutting.




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  15. #910
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    Heres what I have so far with my cold trap evap. The existing port on the cylinder is gonna be the drain, and Im gonna add 2 - 1” taps to the side opposite the factory port.

    Bit of a slow go, but I think I have decent system now.








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