View Poll Results: Thread: size of pipes in Auto HVAC system

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  1. #1

    Post size of pipes in Auto HVAC system

    In an automobile air conditioning system why the size of suction pipe is bigger and the size of discharge pipe is small?

  2. #2
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,051
    It is the same in most refrigeration systems as well.

    We size with low pressure drop thru tubes in mind.

    Since suction line is relatively low pressure and usually the longest it is also usually the largest diameter.

  3. #3

    Post how to decide expansion valve capacity?

    In an automobile HVAC system, how the expansion valve capacity decided? what criteria used for that?

  4. #4
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,051
    I would assume they match it to compressor capacity as well as evaporator size and blower capacity.

    Then they figure out what superheat spring.

    Or it may be just grab one off the shelf. I say that because cars with rear ac don't seem to have larger compressor or condenser.

  5. #5
    Join Date
    Aug 2012
    Posts
    2,666
    Higher pressure less volume, high side. Lower pressure more volume = low side

  6. #6
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,311
    The rpm of the engine controls compressor capacity to a large extent.

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