Results 1 to 8 of 8
  1. #1
    Join Date
    Aug 2013
    Location
    Denmark
    Age
    25
    Posts
    27
    Rep Power
    0

    Test conditions on data sheet compressor



    Hi, im a bit confused about the datasheets of the compressors. i have a datasheet for Danfoss BD350GH compressor which says it is tested according to some standard like
    ASHRAE LBP
    Condensing temp 54.5c
    Ambient temp 32c
    Suction gas temp 32c
    Liquid temp 32c

    The suction gas temp, is it the temperature that goes into the compressor?
    And then when you have to choose a compressor according to capacity it is listed with respect to temp and rpm. the evap temp on this compressor ranges from -25c to 15c, according to the test condition it says that the evap temp is then superheated to the suction gas temp of 32c, is this correct?



  2. #2
    Brian_UK's Avatar
    Brian_UK is online now Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
    Join Date
    Mar 2001
    Location
    Dorset
    Age
    69
    Posts
    10,382
    Rep Power
    49

    Re: Test conditions on data sheet compressor

    Remember that the BD350GH compressor is a variable speed unit so the design data is also variable.
    Brian - Newton Abbot, Devon, UK
    Retired March 2015
    Please support http://the100project.net/Home

  3. #3
    Join Date
    Aug 2013
    Location
    Denmark
    Age
    25
    Posts
    27
    Rep Power
    0

    Re: Test conditions on data sheet compressor

    I was wondering the relation between the evaporating temperature and the suction gas temp, and if this means that it is superheated up to 32c. And if i choose a compressor with a capacity or variable capacity, does the evap need to have atleast the same capacity when dimensioned, or is it the other way around. The compressor needs to have atleast the same capacity as the evaporator?

  4. #4
    Join Date
    Aug 2013
    Location
    india
    Age
    29
    Posts
    1
    Rep Power
    0

    Re: Test conditions on data sheet compressor

    Help on refrigerator problem - won't cool! It's a 2012 Whirlpool.?

    What is wrong with my refrigerator and freezer? It's not cold!?
    I have had my refrigerator/freezer (top) since 2013. It's a Whirpool 2012 model. All of a sudden this evening I went down to get some ice out of the freezer. The ice had melted mostly and was sitting in water from where the ice had melted. The ice cream was runny. The meats were unfrozen quite a bit and it felt warm in there as far as the air blowing out.

    The fan is still blowing. The light comes on when you open the doors. The refrigerator is the same. The drinks in there were getting warm. The temperature is warmer than usual - to the point we had to throw everything out.

    What should I do? Please don't answer with "buy another one" - if you don't know anything to try,

    Wedding Planners in Delhi
    Event Management Companies in Delhi
    Web Designing Companies in Delhi

  5. #5
    Join Date
    Jan 2007
    Location
    India
    Posts
    60
    Rep Power
    12

    Re: Test conditions on data sheet compressor

    32C is return gas temperature . If you need to know the compressor capacity for different super heat value then use Danfoss software(cool selector) to find out the compressor capacity.

    The evaporator design should be for the max. load condition . For the part load conditions compressor capacity will be matched by varying the speed of the compressor

  6. #6
    Join Date
    Sep 2013
    Location
    INDIA
    Age
    27
    Posts
    1
    Rep Power
    0

    Re: Test conditions on data sheet compressor

    Why is it so difficult to obtain an answer to my question about my gast compressor instead of just a comment?
    follow on question/enquiry about my gast doa-p108-fd compressor question

    ____________________________________________________________
    Wedding Planners in Delhi |
    Canadian Visa

  7. #7
    Join Date
    Mar 2006
    Location
    Merate (LC) - Italy
    Age
    46
    Posts
    2,553
    Rep Power
    17

    Re: Test conditions on data sheet compressor

    Typically the max evap temp for any compressor is around 12C, and the test bench SSH by norm is 20K, and that makes a suction temperature of 32C. Basicly the data published refer to probably the rightmost point of the compressor envelope.

  8. #8
    Join Date
    May 2006
    Location
    India
    Age
    67
    Posts
    400
    Rep Power
    12

    Re: Test conditions on data sheet compressor

    Yes the refrigerant which boils or evaporates in evaporator at a temp . The refrigerant as it moves further it picks up heat & superheats at a constant pressure .............while selecting a compressor a certain superheat allowance has to be built in the compressor capacity. This is because the boiling temperature in evaporator will increase due to heat pick up on the way to compressor .....if this increae in temp is not accounted , you will end up in selecting a compressor which will deliver a lesser capacity due gas superheating in evaporator + piping it travels

    dd koranne

Posting Permissions

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