Results 1 to 6 of 6
  1. #1
    Join Date
    Feb 2015
    Location
    Pakistan
    Age
    40
    Posts
    48
    Rep Power
    0

    Designing a Condenser



    Hi

    I have been running cold storage in Pakistan since last 10 years and technology is outdated. I am planning to change from local compressor to KIRLOSKAR 6 cylinder compressor which will give me refrigeration capacity of 320 KW at 750 RPM. This capacity is good for me.

    Now, I am stuck with condenser, as we make everything in Pakistan therefore we will make condenser also in Pakistan. We have done this before also.

    I have discussed matter with one of my Chinese friend engineer who suggest me 2700 meter length of coil 19 MM inner diameter and 2.8 MM carbon steel thickness, without any fins to be cooled by combination of water and air.


    I have changed his design to a a flab bad type condenser which is normal design of air cool but I will use both water and air to cool it down. (Pictures attached)

    My desired room temperature is +3.0 Degree C, with ambient temperature between +6.00 - 25 degree C, to store fresh fruits.

    My question is that:

    Is pipe specifications are ok?
    Is length calculated ok?
    Should I installed fins also?

    Problem in Pakistan is that electricity is world's most expensive therefore initial investment gets faster returns.

    Regards
    Salman Khan
    Attached Images Attached Images



  2. #2
    Join Date
    Sep 2003
    Location
    ISRAEL
    Age
    65
    Posts
    4,098
    Rep Power
    37

    Re: Designing a Condenser

    hello Salman,
    Condenser capacity is not measured by meters but by capacity,
    Q [heat you want to reject] = compressor cooling capacity + compressor current draw [+ 10% to 15%]
    Thats in KW.

    Now you can find the condenser size.

  3. #3
    Join Date
    Feb 2015
    Location
    Pakistan
    Age
    40
    Posts
    48
    Rep Power
    0

    Re: Designing a Condenser

    Is compressor current draw in Amperes?
    My compressor is 320 KW refrigerant capacity and it will draw 125-130 amperes.

  4. #4
    Join Date
    Sep 2003
    Location
    ISRAEL
    Age
    65
    Posts
    4,098
    Rep Power
    37

    Re: Designing a Condenser

    Quote Originally Posted by skhan855 View Post
    Is compressor current draw in Amperes?
    My compressor is 320 KW refrigerant capacity and it will draw 125-130 amperes.
    All parameters should be in KW.

  5. #5
    Join Date
    May 2006
    Location
    India
    Age
    67
    Posts
    400
    Rep Power
    12

    Re: Designing a Condenser

    Hi Salman,

    I might be able to suggest on condenser capacity . But I need the following info:

    1) Evaporation temp :

    2) condensing TEMP :

    3) Comp capacity : 320 kw

    4) Kirloskar comp model : Please confirm Model : KC-6 ?? @750 RPM

    5) Refrigerant : AMMONIA

    6) You will need evaporative condenser .....

    Rgds ,

    D D KORANNE

  6. #6
    Join Date
    Mar 2012
    Location
    Pakistan
    Age
    34
    Posts
    20
    Rep Power
    0

    Re: Designing a Condenser

    Dear Salman,

    You need to calculate the total heat of rejection to know exactly what will be your condenser load.

    Total heat of rejection can be calculated as total refrigeration load (In KW) + motor power (of compressors in KW if load is in KW) and a correction factor depending on your difference in Dry & Wet bulb.

    Then you can use the formula of surface heat transfer i.e: heat transfer coefficient X surface area X log.mean of temperature difference.

    Here the temperature difference would be discharge temperature - condensing temperature.

    I believe this cold storage is in Lahore (Kasur) I think I have seen this one already

    Anybody here give some suggestions to refine this, improve this please..

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •