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  1. #1
    Join Date
    Apr 2012
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    3
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    TOTAL HR AIR COOLED CHILLERS

    hello

    does some one know about EWT to heat recovery heat exchangers using R-134a?

    in a project i deal with the chileer IOM say that the min enetring water temp is 28C.
    and that a BYPASSS VALAVE is needed.

    can someone give some more info ?

    rgrds

    rony

  2. #2
    Join Date
    Jan 2004
    Location
    PA
    Posts
    70,013
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    Moved to chiller forum.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  3. #3
    Join Date
    Jan 2009
    Location
    Not in Iran
    Posts
    1,121
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    There should be a (bypass) with a balance valve between the supply and return water., the reasoning behind this is to balance the system.,
    balance can mean, as for water pressure/flow and the other more advance reason could be to (control ) water temps.,
    no signature blast'em man blast'em
    !!!KILL THE TERRORIST!!!

  4. #4
    Join Date
    Oct 2010
    Location
    Greece
    Posts
    38
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    Hi,
    Most probably you have W/C and A/C condenser in series and the W/C (HR) condenser is a PHE and first in the line.
    IOM indicates this because when the compressor is not in operation and water temp is below 28C then saturation of refrigerant may occur and fill up the PHE with liquid.
    When compressor starts you may have hydraulic hammering and brake PHE.
    The configuration may be pump – PHE – 3way and pump or loads in order to raise the temperature as quick as possible.
    Hope my approach is helpful.
    Regard,
    CV

  5. #5
    Join Date
    Apr 2012
    Posts
    3
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    ?! hydraulic hammering

    hi

    asuume the unit is in the first comision and water temp is 20c.

    the heat recovery water pump is "off" .

    do you think in this situation we can face the hydraulic hammering ?

    if the situation is like this how can the unit start up ?

    we dont have heat source to heat the HR water at firs start !!!

    to brake PHE at first start sound to me not so good !!!!

    rony

  6. #6
    Join Date
    Aug 2006
    Location
    Ohio
    Posts
    2,185
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    This is NOT a Do It Yourself site.

    We get paid to solve these problems.

    Some of you pro members needs to learn this. Keep helping for nothing and this site will be overrun with people asking you to use your knowledge for free.

  7. #7
    Join Date
    Apr 2012
    Posts
    3
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    hello ZW17

    you are correct .

    its my mistake to ask this question .

    rony

  8. #8
    Join Date
    Jan 2004
    Location
    PA
    Posts
    70,013
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    Quote Originally Posted by ronydaiki View Post
    hello ZW17

    you are correct .

    its my mistake to ask this question .

    rony

    No its not.

    However, some members will chose not to aid anyone that is not a Pro member. And that is there right.

    Please get your post up to 15 and apply for pro membership.
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