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  1. #1
    Join Date
    Apr 2004
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    MN
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    1,800

    Heat pump filter/drier question

    If a heat pump utilizes a single capillary tube for metering to both coils, would 2 filter/driers be required? I would assume you would need one at each end of the cap tube with a bypass on each filter/drier.
    A Veteran is a person, who at some point in their life, wrote a blank check payable to the United States of America for payment up to and including their life.
    Gene Castagnetti-Director of the National Memorial Cemetery of the Pacific in Hawaii

  2. #2
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    Feb 2009
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    Tallahassee, FL
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    Wouldst it be impossible to size the single cap tube for proper pressure in heat and cool?

  3. #3
    Join Date
    Mar 2013
    Location
    Joplin,Missouri
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    310
    One biflow drier in the liquid line should be all you need

  4. #4
    Join Date
    Dec 2003
    Location
    Citrus County, Florida
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    1,507
    Quote Originally Posted by SBKold View Post
    Wouldst it be impossible to size the single cap tube for proper pressure in heat and cool?
    I would tend to agree with you because you'd be using less of a charge in heat mode.
    Doug

  5. #5
    Join Date
    Apr 2004
    Location
    MN
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    1,800
    Here's the deal. I'm designing a heat pump that has a manually operated valves for the RV. Trying to keep it as simple and inexpensive (value engineering) as possible. I was thinking if I used 2 coils of the same size with a cap tube in between them it would make the concept of reverse flow easy to understand. It will be a fractional horsepower compressor from a Coke machine. Maybe I should just use 2 cap tubes, each with a filter/drier and check valves?
    A Veteran is a person, who at some point in their life, wrote a blank check payable to the United States of America for payment up to and including their life.
    Gene Castagnetti-Director of the National Memorial Cemetery of the Pacific in Hawaii

  6. #6
    Join Date
    Jun 2004
    Posts
    849
    Yes u would need two driers if u only have one cap tube
    But single cap tube theory will not work
    Cause indoor and out door don't have the same load.

    I'm not sure where would u put ur manual change ove reversing valve?
    Fractional HP will not work
    Not enough btu capacity

  7. #7
    Join Date
    Feb 2013
    Location
    Florida
    Posts
    69
    With a single cap tube(which I don't think it would be possible), you would have to use a bi-flow filter as their wouldn't be any check valves and you would only have one path for the liquid

  8. #8
    Join Date
    Apr 2004
    Location
    MN
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    1,800
    Shaka, all I'm trying to accomplish with this "test" model is theory reinforcement. A fractional hp compressor will do absolutely fine. All I'm hoping for is a cold coil and a warm coil. Not really desiring great amounts of heat transfer. I did this drawing in Paint. Let's see if it will work. By closing one of the valves in the discharge line and one of the valves in the suction line, I should be able to manually control the direction of flow.
    Name:  Manual heat pump.png
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    Last edited by doc havoc; 03-27-2013 at 05:24 PM. Reason: Changed diagram to reflect closed valves.
    A Veteran is a person, who at some point in their life, wrote a blank check payable to the United States of America for payment up to and including their life.
    Gene Castagnetti-Director of the National Memorial Cemetery of the Pacific in Hawaii

  9. #9
    Join Date
    Feb 2009
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    Tallahassee, FL
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    looks good to me doc.

    put 2 biflow driers on either side of tube or just even strainers since its just a model.

  10. #10
    Join Date
    Jun 2004
    Posts
    849
    My bad
    It's a learning apparatus
    In that case it looks good

    Why not just use a real RV
    So they can understand it on the bench.
    If u ask me those shut off valve cost more that RV.

  11. #11
    Join Date
    Jul 2009
    Location
    Columbia, MD
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    Just use one drier and add it onto discharge right after compressor. York did it for years.

  12. #12
    Join Date
    Aug 2009
    Location
    Maine
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    Sort of like a small condensing unit and evap. I always tell the customer to think of a window AC turns around.

    Quote Originally Posted by doc havoc View Post
    Shaka, all I'm trying to accomplish with this "test" model is theory reinforcement. A fractional hp compressor will do absolutely fine. All I'm hoping for is a cold coil and a warm coil. Not really desiring great amounts of heat transfer. I did this drawing in Paint. Let's see if it will work. By closing one of the valves in the discharge line and one of the valves in the suction line, I should be able to manually control the direction of flow.
    Name:  Manual heat pump.png
Views: 125
Size:  10.1 KB

  13. #13
    Join Date
    Feb 2009
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    Tallahassee, FL
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    6,031
    Quote Originally Posted by gravity View Post
    Just use one drier and add it onto discharge right after compressor. York did it for years.
    Just make sure its a quality solid core one from sporlan though!

    Not a bad idea though....then just use a couple strainers at the cap tube. Guess the only downside is the strainers will release any debris whenever it switches.

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