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  1. #1
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    Hello, I need some technical help



    I've a question here in which I am a little puzzled by..I have this data Quantity Units Set1 Set2 Set3 Set4
    Refrigerant flow rate g/s 7.5 6.5 5.4 4.5
    Condenser pressure kN/m^2 1125 1100 950 850
    Evaporator pressure kN/m^2 290 225 185 145
    Compressor inlet temp C 23.7 10 8.1 3.7
    Compressor outlet temp C 67.3 65.7 63.6 61.7
    Compressor input voltage V 225 225 225 225
    Compressor input current A 4.5 4 3.8 3.8
    Condenser outlet temp C 26.4 26.5 24.2 22.9
    Evaporator inlet temp C 7.9 4.9 0.9 -3.8
    Condenser water in temp C 15.5 15.7 15.7 15.7
    Condenser water out temp C 34.2 32.4 30.4 28.2
    Cooling water flow rate g/s 2.1 2.2 2.15 2.1
    Compressor speed R.P.M 457 460 462 464
    Evaporator input voltage V 220 200 185 170
    Evaporator input current A 6.1 5.4 5.1 4.5
    Brake force N 14.5 13 12.2 11.95

    The questions I have is "using 134A property tables find the compressor, condenser and evaporator loads"..."compare these to the corresponding loads on the water and electrical inputs and explain any observed differences"
    Now this is all good and well but I haven't the slightest idea what they want done and how to approach it..this coupled with plotting a R134a ph diagram. All other work is fine except this section of refrigeration. I would be eternally grateful for your collective and innate wisdom.



  2. #2
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    Re: Hello, I need some technical help

    For start, put that in Excel table and post here.
    Now, when I am officialy citizen off EU, I am looking for decent job! For any job offer please check my profile!

  3. #3
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    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: Hello, I need some technical help

    I would go back to your tutor and tell him that you are unable to answer this as he hasn't taught that subject yet.
    Brian - Newton Abbot, Devon, UK
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  4. #4
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    Re: Hello, I need some technical help

    What is the primary purpose of refrigeration? To cool something.
    What direct bit of data is missing? What you are doing to what you are cooling!
    So look at your refrigerant mass flow, then look at the evaporator "fan/pump???" What are you changing here?
    Then it should make sense.

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