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Thread: How to figure out Strength Test Criteria for R404a Refrigerant?

  1. #1
    Rob
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    How to figure out Strength Test Criteria for R404a Refrigerant?

    Hi, I'am new to Refrigeration. I'am doing course which will allow me to work in the field as a Refrigeration Engineer. Good that website like that one exists. So I can ask someone about things I don't know.

    My question is like in title of this topic.

    How to count the Strength Test Pressure for split unit (Air/Con)?
    Last edited by Rob; 02-09-2013 at 12:45 PM.

  2. #2
    Administrator Maciek's Avatar
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    Hi, Rob

    Welcome to our Forum

  3. #3
    Matthew
    Guest
    Hi, Rob


    First of all. You need to know in which geographic zone you live.

  4. #4
    Rob
    Guest
    What you mean by zone?

  5. #5
    Rizzo
    Guest
    Hi Rob here is how you work it out for R-404a for an air cooled condenser.

    Low side 32 degrees = 13.91bar High side 55 degrees = 24.54bar
    13.91x1.1=15.3bar) 24.54x1.1=27bar
    13.91x1.5=20.7bar) 24.54x1.5=36.8bar
    Range is between 15.3-20.7bar Range is between 27-36.8bar

    hope that helps

  6. #6
    Matthew
    Guest
    Quote Originally Posted by Rob View Post
    What you mean by zone?
    By zone I mean the standard ambient temperature. Generally in the world we can find two different climate zones. The places where ambient temperature is taken as 43 Celsius (Asia, Africa, Australia, and some parts of middle and south America). Everywhere else the ambient is equal to 32 degree of Celsius.


    32c Ambient 43c Ambient
    High pressure side
    Air cooled Condenser
    55c 63c
    High pressure site
    Water Cooled Condenser
    43c 43c
    Low pressure side 32c 43c


    Now we need to find out the pressure of our refrigerant at 32C for low side pressure and 55C for high side pressure. To do that we need to use comparators.
    Refrigerant R404a at 55 degree Celsius is under 24.54(Bar) of pressure and in low side is equal to 13.91(Bar).

    We need to apply the formula to count a High side strength pressure.
    The H.P Strength test = Ps(highside)x 1.1 and x 1.5
    The H.P Strength test = 24.54 x 1.1 = 27 and 24.54 x 1.5 = 36.81
    The H.P Strength test = 27(Bar)(minimum) and 36.81(Bar)(maximum)

    Just before we apply the OFN in to the system for strength test we need to make sure that all devices on H.P side are able to take that high pressure. If one of the devices can't co-op with pressure of 36.81 (Bar) then we need to go for minimum Strength Test Criteria which in this scenario as we counted is equal to 27(Bar)

    Formula to count Low Side Pressure, strength test.
    The L.P. Strength test = Ps(Low side) x 1.1
    The L.P. Strength test = 13.91 x 1.1
    The L.P. Strength test = 15.3(Bar)

    The Strength Test Criteria for low side is equal to 15.3(Bar)

    *H.P.-High Pressure Side of refrigeration system.
    *L.P.-Low Pressure Side of refrigeration system.
    Last edited by Matthew; 02-20-2013 at 03:37 AM.

  7. #7
    Rob
    Guest
    Thanks guys for all...

  8. #8
    Thanks great topic

  9. #9
    Junior Member Po65's Avatar
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    Ya nice topic cheers lads

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