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  1. #1
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    Coil Sizing for ammonia refrigeration system



    Hi there,
    I am student at a university and have been given a project of designing a ammonia refrigeration system having a blast freezer and a cold room. I have calculated all the load values and now need to calculate the surface area and length of the coil. How do i do that and please explain in simple terms as i am a student



  2. #2
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    Oct 2003
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    Re: Coil Sizing for ammonia refrigeration system

    You don't need to select a coil but an evaporator for both rooms.
    Take 1st a catalog of a manufacturer of NH3 coolers and study first the selection criteria
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  3. #3
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    Re: Coil Sizing for ammonia refrigeration system

    But my project supervisor has asked me to find out the coil sizing. He asked to use the formula q=uadeltat and has already given me the delta t which is 5 and load for my cold room is about 17kw and blastfreezer is 40.11kw

  4. #4
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    May 2007
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    Re: Coil Sizing for ammonia refrigeration system

    q = k factor x TD' K / thickness x 10 -3
    k factor aluminium = 205w/m.K
    1% carbon steel = 43 w/m.K
    stainless steel = 16w/m.K
    reference info from www engineers toolbox

  5. #5
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    Nov 2013
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    Re: Coil Sizing for ammonia refrigeration system

    i am a bit confused here, does this formula give me the thickness? and how do i find the length of the coil and surface area of the coil?

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