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  1. #1
    Join Date
    Jul 2006
    Posts
    68

    Confused CVHE R-11 Condensor problems

    Have an old R-11 CVHE which is now having high head problems. Running at about 8 psi, I know all the reasons that could cause this prolem. Did the temp-pressure chart deal, saturated cond. liquid temp @ about 80 degrees which should be 1.5 psi cond. pressure. Just did some leak repairs, was able to pull a 500 micron vacuum and hold it. Just can't believe that it is sucking in air. My purge has not pumped out at all. Have other issues also, flow is not at design, delta p is about 4-5, design is 8.3 psi. Tower approach is really wacked out as well, 48 degree w.b. with a leaving tower water temp of 80. My condenser approach is anywhere from 12-14 degrees. I realize there are other issues, but can having tower problems, flow problems, and/or fouled tubes sqew my temp-pressure relationship. Common sense tells me I have got non-condensables, but can my other problems look like this? Thanks for your guys help!!

  2. #2
    Join Date
    Jan 2004
    Posts
    1,174
    You have alot of stuff going on so you have to start somewhere ,you need to figure out flow problem , tower issues, than check your tubes and then when the approach is good you can have a better ideal what the condensor is doing.

  3. #3
    Join Date
    Jun 2003
    Location
    in a tree looking in your window
    Posts
    1,158
    What kind of purge is on this ? Purifier, if so what vintage, doesnt sound to me like the purge is working, granted you have a lot going on but I would start with the purge and check all the strainers for your cond water pumps and towers.
    If you dont stand behind our troops, please feel free...........to stand in front of them.

  4. #4
    Join Date
    Oct 2005
    Location
    phoenix az
    Posts
    429
    our cvhe r11 readings are typically tower water in 80 out 90 with 6-8 psi for the condenser.
    and an approach of 5-10


    if your tower water entering the chiller is 80 and your saturation temp is 80 you are not moving any heat are you sure you have the correct reading for saturation temp use your guages and compare to ems or control panel readings

    give us all your readings

    cw in
    cw out
    cond sat temp
    chw in
    chw out
    evap sat temp
    cw leaving head psi
    chw leaving head ppsi
    cooling setpoint
    Last edited by skorepeo; 03-21-2007 at 04:41 PM.

  5. #5
    Join Date
    Oct 2006
    Location
    Central Texas
    Posts
    627
    Got a couple of extra questions for you: what percent load are you? Full load- partial load. Your concerned about purge or air in the machine, what is your system air temp? Dicharge temp minus drop leg liquid refrigerant temp (I take mine before the economizer). What is your delta acorss your barrel? What gpm are you running? What is your evap pressures/temps? You mentioned that you pulled the macine down to 500 micron vacuum. Was this after 12-24 hour rise period? Are you experiencing any high-end surges? Sounds kind of like flow restrictions or fouled tubes, approach being higher, however air in the machine can give similar issues. Hopefully, these and the other posts can help, get all your info. & post back. Let us know what you find. By the way, what type of repairs did you do to the machine?
    Sic Semper Tyrannis.

  6. #6
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,259
    Quote Originally Posted by jschaible View Post
    Have an old R-11 CVHE which is now having high head problems. Running at about 8 psi, I know all the reasons that could cause this prolem. Did the temp-pressure chart deal, saturated cond. liquid temp @ about 80 degrees which should be 1.5 psi cond. pressure. Just did some leak repairs, was able to pull a 500 micron vacuum and hold it. Just can't believe that it is sucking in air. My purge has not pumped out at all. Have other issues also, flow is not at design, delta p is about 4-5, design is 8.3 psi. Tower approach is really wacked out as well, 48 degree w.b. with a leaving tower water temp of 80. My condenser approach is anywhere from 12-14 degrees. I realize there are other issues, but can having tower problems, flow problems, and/or fouled tubes sqew my temp-pressure relationship. Common sense tells me I have got non-condensables, but can my other problems look like this? Thanks for your guys help!!
    i would question your vacuum or you got air in it when you were re-charging. my guess is the latter. poor water flows and large approach temps will affect the chiller heat transfer...but not the p-t relationship. purge may/may not be working...did you reopen the purge valves?

    you definitely have issues, but finding them is half the problem and i am sure that you will get those solved. as far as the air...you need to get rid of it of course. perform a complete check out of the purge according to the purge IOM. then get your cond water under control. if you get your tower under control first...it will help, but you can work on this while your purge is getting the air out.
    my 1st time jumping out of a plane...http://youtu.be/Kv38G0MHsGo

  7. #7
    Join Date
    Jun 2004
    Posts
    246
    I agree with chillrdude. Get tower problem fixed then look at purge. The old purifiers had cores in them that would crumble up and clog up the unit.

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