Results 1 to 6 of 6
  1. #1
    Join Date
    Mar 2002
    Location
    Spain
    Posts
    67
    Rep Power
    23

    cheese versus aluminium?



    Hi all;

    I´ve heard that there are problems in refrigeration chambers with cheese and the aluminium fins of the evaporators. Somebody told me about lactic acid.

    Could anybody gives a chemical reason?

    On the other hand, Does anyone know another bad combination between any product and evaporator´s materials?

    Regards



  2. #2
    Join Date
    Dec 2001
    Location
    Italy
    Posts
    19
    Rep Power
    0
    In my experience I saw evaporators literally destroyed when they were in an environment rich in acid atmosphere. Typical examples are foods preserved with vinegar, or dried pork meat preserved with nitrite... In the worst cases, when touching the fins, they became powder... Really shocking, even thinking about what they put in the food we eat.
    Greetings.

  3. #3
    Join Date
    Mar 2002
    Location
    Spain
    Posts
    67
    Rep Power
    23
    And do you think that it is enough with a epoxy or cataphoresis treatment in the fins or it would be better using copper fins?

    Thanks for answering

  4. #4
    Join Date
    Dec 2001
    Location
    Italy
    Posts
    19
    Rep Power
    0
    The treatments you talk about can surely help. But the best solution is to suggest the customer to hermetically close the product in boxes or packets before storing them in the cold room... If this isn't possible, consider the chance it'll be necessary to change the evaporator each three or four years.. (even less, if unlucky). Copper fins wouldn't help, since copper react to acidity as well.
    Have a nice day

  5. #5
    Join Date
    Dec 2002
    Location
    Malaysia
    Age
    59
    Posts
    86
    Rep Power
    22
    Dear All,

    Could someone explain how epoxy or cataphoresis treatment is done ? Is it just a coating ? Thickness ? Doesn't this affect the conductive heat transfer ?

    ( I have an application where tobacco is stored in a temperature =controlled room. These tobacco attract weevils and the only way to get rid of them is to close the room and fog it and then release the contaminated air by some means of -ve pressure. I'm not sure what the 'fog' is made of but it 'eats' up the aluminium fins. One solution we had was to 'wrap the blower units with shrink wrapping material' and remove them once the room is well ventilated!!)

    Anyone with similar experience ?

    Bernard

  6. #6
    Join Date
    Feb 2001
    Location
    Tampa Florida
    Posts
    1,086
    Rep Power
    25
    I don't know what cataphoresis is, but something handy and not too expensive is vinyl coated fins. The fin stock is vinyl coated. I see evaporators 15-years old doing quite well in deli cases and coolers.

    The vinyl also limits the effect of galvanic action with the copper, since the extrusions have a layer of vinyl touching the copper.

Similar Threads

  1. Cheese Room Evaporator
    By Ireland in forum Technical Discussions
    Replies: 4
    Last Post: 05-04-2006, 11:22 PM
  2. Cheese Room Design 24V DC
    By jbelding in forum Fundamentals
    Replies: 10
    Last Post: 02-04-2006, 03:23 PM
  3. AKV versus higher load
    By Peter_1 in forum Industrial
    Replies: 20
    Last Post: 18-04-2004, 11:05 AM
  4. DuraFix aluminium brazing rods.
    By DaBit in forum Tools and Calculators
    Replies: 15
    Last Post: 23-01-2004, 04:34 PM
  5. cylinder of aluminium
    By milton in forum Tools and Calculators
    Replies: 1
    Last Post: 16-01-2004, 03:02 PM

Posting Permissions

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