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  1. #1
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    Reverse Cycle Air Conditioning



    Hello.

    A quick question. Do reverse cycle air conditioners actually reverse the compressor or is it just a valve that they use to divert the refrigerant?



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    Re: Reverse Cycle Air Conditioning

    Hi Kompulsa

    I will jump on this one mate, as most engineers would not know this !

    The compressor I think

    R's chillerman
    Last edited by chillerman2006; 19-10-2011 at 01:13 PM.
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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by chillerman2006 View Post
    Hi Kompulsa

    I will jump on this one mate, as most engineers would not know this !

    The compressor I think

    R's chillerman
    Sounds reasonable. I have just fitted a flexiflow water pump which shows when you connect the pump(bl-bl & r-r) it runs clockwise but if you reverse the wires (bl-r & r-bl) it will run anti-clockwise

    cleaver stuff these wiggly amps

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by Kompulsa View Post
    Hello.

    A quick question. Do reverse cycle air conditioners actually reverse the compressor or is it just a valve that they use to divert the refrigerant?
    My answer is: the valve changes the direction of refrigerant flow . One way street here, no reversing the compressor. BTW, love the Jamaican Rum!!
    To the optimist, the glass is half full. To the pessimist, the glass is half empty.

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by mikeref View Post
    My answer is: the valve changes the direction of refrigerant flow . One way street here, no reversing the compressor. BTW, love the Jamaican Rum!!
    Hi Mike

    are you sure about that mate or is it the ''Rum'' talking

    may be you could explain for the 'original poster' 'RB' & myself how this all works

    if you could start with the vapour compression cycle in cooling mode

    & then break us in slowly to reverse cycle, would be most useful

    R's chillerman
    If the World did not Suck, We would all fall off !

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by chillerman2006 View Post
    Hi Mike

    are you sure about that mate or is it the ''Rum'' talking

    may be you could explain for the 'original poster' 'RB' & myself how this all works

    if you could start with the vapour compression cycle in cooling mode

    & then break us in slowly to reverse cycle, would be most useful

    R's chillerman
    Oh... Would be happy to do so, but i seem to remember a previous engagement with my bottle of spirits and the "sandman" tonight. Maybe some other time then?
    To the optimist, the glass is half full. To the pessimist, the glass is half empty.

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    Re: Reverse Cycle Air Conditioning

    One direction CM, reversing valve changes the flow direction.....Appletons is my fav rum....yum

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    Re: Reverse Cycle Air Conditioning

    If the flow of time reversed then that would be a "real" reverse cycle!!!!

    Although a valve might also do the trick
    Quidvis Recte Factum Quamvis Humile Praeclarum.

    Latine dictum, sit altum videtur.

    Si hoc comprehendere potes, gratias age magistro Latinae.

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    Re: Reverse Cycle Air Conditioning

    So it seems we have some "For" and "against" here. Think i'll go with Trash101 at this time. Seems reasonable in my current state of mind thankyou..
    To the optimist, the glass is half full. To the pessimist, the glass is half empty.

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by mikeref View Post
    Oh... Would be happy to do so, but i seem to remember a previous engagement with my bottle of spirits and the "sandman" tonight. Maybe some other time then?
    Yeah, enjoy your zzz's mate
    Quote Originally Posted by MikeHolm View Post
    .Appletons is my fav rum....yum
    Mike, check out the picture, will save the rest of this, just in case you get round to visiting us in the uk !
    Quote Originally Posted by TRASH101 View Post
    If the flow of time reversed then that would be a "real" reverse cycle!!!!
    Hi Trash

    if ever you discover that one mate, keep me in mind for a beta copy

    R's chillerman
    Last edited by chillerman2006; 19-10-2011 at 01:07 PM. Reason: pic removed
    If the World did not Suck, We would all fall off !

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by Kompulsa View Post
    Hello.

    A quick question. Do reverse cycle air conditioners actually reverse the compressor or is it just a valve that they use to divert the refrigerant?
    Hi Kompulsa

    See attached picture

    R's chillerman
    Attached Images Attached Images
    Last edited by chillerman2006; 19-10-2011 at 01:14 PM.
    If the World did not Suck, We would all fall off !

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by mikeref View Post
    My answer is: the valve changes the direction of refrigerant flow . One way street here, no reversing the compressor. BTW, love the Jamaican Rum!!
    I can assure you my water pump specifically states you swap the wires to change the direction. This is very confusing....

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    Re: Reverse Cycle Air Conditioning

    .

    There is no refrigeration compressor that I know of that runs in reverse.

    Think about it?

    A recipricating piston compressor does not know which way it runs because the rotation is
    converted into up and down motion. It is the valves that direct the gas.

    A scroll can only run one way
    A screw can only run one way
    A centriff also.

    I'm not sure of a rotor????

    So the compressor always runs and always sucks through the suction
    and out through the discharge.

    It is the valve that moves to create the flow to move in the oposit direction.

    All the best

    taz

    .

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    Re: Reverse Cycle Air Conditioning

    Thank you. I believe that the compressor doesn't reverse either. My Toshiba datasheet says that it is for the Heating and Cooling type of air conditioner and nearer to the bottom it says "do not try to reverse compressor".

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    Re: Reverse Cycle Air Conditioning

    Hi RB

    I remember a screw compressor wired red, blue, yellow (by another I hasten to add)

    That ran backwards too, but for some strange reason needed replacing

    I decided to go for red, yellow, blue and thats was ok

    R's chillerman
    If the World did not Suck, We would all fall off !

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by mikeref View Post
    So it seems we have some "For" and "against" here. Think i'll go with Trash101 at this time. Seems reasonable in my current state of mind thankyou..
    Current state meaning RUM?

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by r.bartlett View Post
    I can assure you my water pump specifically states you swap the wires to change the direction. This is very confusing....
    Water pump?

    It will most likely use a small vane so rotation could be in both directions.

    But think of how most water pumps work?
    They draw water in from one side and the rotor, turbo, centrif, vane or waterever
    they are called, then spits the water out through the other hole. So even a normal
    water pump would struggle with direction.

    If it is a peristaltic type pump they run either direction.

    All the best

    taz

    .
    Last edited by taz24; 19-10-2011 at 02:12 PM.

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by chillerman2006 View Post
    Hi Kompulsa

    See attached picture, looks I may be wrong !

    R's chillerman
    \

    I should have made a wager on in for the bottle of rum.....

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    Re: Reverse Cycle Air Conditioning

    "Circulator" type or any other type of pump that takes liquid from the suction at the centre and discharges from a spot on the edge of the impeller will not work well backwards (Grundfos, Wilo, any inline pump). The impeller and the input output geometry must be symmetrical (or nearly so) and scrolls for sure are not symmetrical.

    Positive displacement such as vane or lobe pumps can do it.

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by chillerman2006 View Post
    Hi RB

    I remember a screw compressor wired red, blue, yellow (by another I hasten to add)

    That ran backwards too, but for some strange reason needed replacing

    I decided to go for red, yellow, blue and thats was ok

    R's chillerman
    I remember a Bitzer semi hermetic srew that had a faulty discharge
    one way valve and when it turned off the gas just reversed the
    the screws and it ran backwards.

    The only problem was the main bearing is also a thrust bearing and
    they are designed for the load in one direction only. When the thing
    ran in reverse it put loads on the bearing in the wrong direction and
    it siezed up.....

    All the best

    taz

    .

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by taz24 View Post
    I remember a Bitzer semi hermetic srew that had a faulty discharge
    one way valve and when it turned off the gas just reversed the
    the screws and it ran backwards.

    The only problem was the main bearing is also a thrust bearing and
    they are designed for the load in one direction only. When the thing
    ran in reverse it put loads on the bearing in the wrong direction and
    it siezed up.....

    All the best

    taz

    .
    Hi Taz

    yeah easy to spot mate, in reverse by the sound they make

    the one I refer to (also a bitzer) had only run a short period of time

    but by time I got there & rewired it was too late

    the compressor went down the following day

    R's chillerman
    If the World did not Suck, We would all fall off !

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by taz24 View Post
    Water pump?

    It will most likely use a small vane so rotation could be in both directions.

    But think of how most water pumps work?
    They draw water in from one side and the rotor, turbo, centrif, vane or waterever
    they are called, then spits the water out through the other hole. So even a normal
    water pump would struggle with direction.

    If it is a peristaltic type pump they run either direction.

    All the best

    taz

    .
    They are not called heat PUMPS for nothing I can tell you..

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    Re: Reverse Cycle Air Conditioning

    I stand corrected..

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by r.bartlett View Post
    They are not called heat PUMPS for nothing I can tell you..
    Cheeky.

    I'll tell on you young mister Bartlett if you don't stop picking on me
    .

    All ther best

    taz

    .

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    Re: Reverse Cycle Air Conditioning

    I'm pretty sure that mine is at least the type that does not reverse but can be used with reverse cycle systems. i wonder if mine is specifically made to handle cycle reversal or if they just use standard compressors.
    Visit http://www.kompulsa.com/ for technology news, reviews, and more. Twitter: Kompulsa.

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    Re: Reverse Cycle Air Conditioning

    wot about the little guy inside the unit that turns everything around so it works backwards
    I can fix broke but I cant fix stupid :)

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    Re: Reverse Cycle Air Conditioning

    si is that the same lil guy in the atm machines and the photo booth's haha

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    Re: Reverse Cycle Air Conditioning

    Quote Originally Posted by install monkey View Post
    si is that the same lil guy in the atm machines and the photo booth's haha

    yeah theres loads of them bet they get paid well
    I can fix broke but I cant fix stupid :)

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    Re: Reverse Cycle Air Conditioning

    You can hire them wee lads ,
    Try Access All Areas ,or Rent a runt ,
    Very handy for those tight shafts or passing the time on your breaks by seeing who can throw him the furthest .
    Cheers
    Stu
    Tool's ? check ! Condom's ? check !
    If you can't fix it , f*ck it !!!

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    Re: Reverse Cycle Air Conditioning

    Just another name for "heat pump".

    http://www.youtube.com/watch?v=TqlYsXnICXw

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