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  1. #1
    Join Date
    Dec 2009
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    162

    Metering devices

    Hey guys, just looking for some general info on the different types of metering used on different types of barrels. I've been googling stuff but I'm not really coming up with the info I'm looking for.

    Sent from my SCH-i705 using Tapatalk

  2. #2
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,438
    You will have to be more specific....are you just wanting to know general knowledge about the idea or are you looking to expand your library?

  3. #3
    Join Date
    Dec 2009
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    162
    Both.

  4. #4
    Join Date
    Sep 2002
    Posts
    12,703
    What do you mean: "barrels" ?

    PHM
    ------




    Quote Originally Posted by 929rc51 View Post
    Hey guys, just looking for some general info on the different types of metering used on different types of barrels. I've been googling stuff but I'm not really coming up with the info I'm looking for.

    Sent from my SCH-i705 using Tapatalk
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  5. #5
    Join Date
    Dec 2009
    Posts
    162
    Evap barrels? Am I using the wrong terminology here? Sorry.

  6. #6
    Join Date
    Sep 2002
    Posts
    12,703
    Like a chiller barrel? That would be an evaporator barrel.

    Refrigerant metering can be done with anything which will restrict the flow. A hand valve, a mechanical TXV, an electronic valve, a computer controlled valve, a float on the high or the lower side.

    Any interesting thing would be to try and work out a huge cap tube - say a few hundred tons of cooling capacity. <g>

    Why do you want to know these things?

    PHM
    ------
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  7. #7
    Join Date
    Dec 2009
    Posts
    162
    I am putting together general chiller info for my coworkers.

  8. #8
    Join Date
    Apr 2014
    Location
    Kentucky
    Posts
    10
    I am new to the forum but I have worked on a few hydronic systems, a 25 ton Carrier being the most recent and it used a 17 step electronic txv, the other was a mechanical, the mechanical was an older 5 ton.

  9. #9
    Join Date
    Dec 2009
    Posts
    162
    I've worked on a good amount of air cooled and a couple of centrifugal's but I've never really researched the different metering devices and which barrels they usually are combined with. I've seen a flooded barrel with a hand valve, a few different DX, and a falling film all with exv's. Just want a better knowledge.

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  10. #10
    Join Date
    Apr 2014
    Location
    Kentucky
    Posts
    10
    Both were flooded barrel and both had hand valves,like any other evap. if a guy did the math I dont think choice of what style would matter. Are you going to build you a system?

  11. #11
    Join Date
    Mar 2010
    Location
    Morgan Hill Ca.
    Posts
    1,219
    Low pressure machines generally just have an orifice plate.

    You're going to need to be more specific in what you need. That is unless you want to sort through three thousand posts on "generalizations".


    GT
    If a day goes by and you have learned nothing, I hope you got a lot of sleep.

  12. #12
    Join Date
    Dec 2009
    Posts
    162
    Not trying to build a system, just trying to get more knowledge. Are hand valves typically uses on flooded barrels? What type of barrels are on low pressure machines that use orifice plates? Is there a difference between dry expansion and direct expansion, or do they just use the term dry to differentiate from wet(flooded)? Are TXV's used on larger chillers? If so are they used on flooded barrels, or just DX? When there is a float valve on the condenser is there anything else used on the evap? See where I'm going with this?

  13. #13
    Join Date
    Mar 2010
    Location
    Morgan Hill Ca.
    Posts
    1,219
    Holy crap. I guess I asked for that one.

    Quote Originally Posted by 929rc51 View Post
    Not trying to build a system, just trying to get more knowledge. Are hand valves typically uses on flooded barrels?
    Not typically, but very occasionally. Really depends on the system, probably see hand valves more in industrial processing plants, like wine vintners and large scale vegetable processors.

    Quote Originally Posted by 929rc51 View Post
    What type of barrels are on low pressure machines that use orifice plates?
    Orifice plates are used on Trane CVHE centrifugals and I believe York YT chillers, R113, R11, and R123. I am sure there are others.


    Quote Originally Posted by 929rc51 View Post
    Is there a difference between dry expansion and direct expansion, or do they just use the term dry to differentiate from wet(flooded)?
    DX or direct expansion, is basically stating that the medium having the heat removed is via refrigerant. Flooded is DX but in a different manner.


    Quote Originally Posted by 929rc51 View Post
    Are TXV's used on larger chillers?
    Yes, as are EXV's. level controls and orifice plates.


    Quote Originally Posted by 929rc51 View Post
    If so are they used on flooded barrels, or just DX?
    All of the above, question is difficult to answer.


    Quote Originally Posted by 929rc51 View Post
    When there is a float valve on the condenser is there anything else used on the evap?
    No floats on the condenser, the evaporator refrigerant level is typically controlled for a flooded evap. The compressor then pull the vapor off the top causing the refrigerant to flash, absorbing heat as it converts.


    Quote Originally Posted by 929rc51 View Post
    See where I'm going with this?
    Nope.


    GT
    If a day goes by and you have learned nothing, I hope you got a lot of sleep.

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