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Thread: One for the fridgies

  1. #801
    Join Date
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    Quote Originally Posted by Old Farang View Post
    There has been some "discussion" concerning tradesmen overlap between plumbers and fridgies.

    So who is responsible for these things:

    Why Choose A Sanden Heat Pump System | Sanden Hot Water

    I am a former ships engineer and electrician, not a fridgie, but I have yet to meet a "plumber" that should be let loose ANYWHERE near this stuff!

    No offence to plumbers, that is, properly trained ones, but this stuff is DANGEROUS!
    Just don't buy one and you will be fine.
    Troublesome bloody things,don't ask me how i know😡

    Fridgies repair them,plumbers install them then run away as quickly as they can, as soon as they get paid.

    But yes,all Fridgies now have to have a Mechanical services plumbing license,in QLD.
    I thought it was only for working on chilled water and condenser water reticulation systems,but it probably also covers heat pump hot water systems i presume.Something i need to check.
    Paul

    Discoless for the first time in 21yrs

    '56 S1,been in the family since...'56

  2. #802
    Join Date
    May 2012
    Location
    Bangkok
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    924
    I am posting this here in the hope that "some" of the experts on the EV thread will bother to read it, rather than clutter up a thread that has nothing to do with it.
    I have never worked on one of these, but did study them along the way, probably in the US.

    Heat Pumps:
    Ground heat exchangers—A review of systems, models and applications

    https://www.sciencedirect.com/science/article/abs/pii/S0960148107000092

    Domestic Ground Source Heat Pumps

    A Ground Source Heat Pump transfers heat from the ground into buildings.


    Domestic Ground Source Heat Pumps | Advantages of Ground Source Heat Pumps | Good design is critical to good performance | Coefficient of performance


    Or if you are a real geek:

    https://www.sciencedirect.com/topics/engineering/ground-heat-exchanger




    Last edited by Old Farang; 19th October 2020 at 09:57 PM. Reason: add another link

  3. #803
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    The massive Geoscience Australia building in Canberra uses a roughly 100m field for geothermal heating/cooling.
    The company I worked for there had the heating/cooling maintenance contract and it was 'my' site.
    The pump and valve room in the basement is massive, and impressive. It was one of the first things I'd take a newbie to see. One for the fridgies
    I'll dig up some pics.

    Mind, there is still 4,x2MW York chillers on the roof. One for the fridgies

    https://www.google.com/url?q=http://...oZSApkVRPpkN49

  4. #804
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    A couple of buildings were done like that around here for the ducted AC units.

    By the time 2 yrs was up,every buried condenser circuit had leaks

    All the AC systems in the buildings had to be replaced.
    Paul

    Discoless for the first time in 21yrs

    '56 S1,been in the family since...'56

  5. #805
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    Mar 2018
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    Perth
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    Quote Originally Posted by scarry View Post
    A couple of buildings were done like that around here for the ducted AC units.

    By the time 2 yrs was up,every buried condenser circuit had leaks
    I built a geothermal DX ducted A/C for home in 2012. I replaced it in 2018 for a conventional Panasonic ducted.

    We have a very high water table, so I used a supply bore and re-injection bore in an open loop config to run a brazed plate HX as a condenser. I tweaked the evap to run between 4 & 8C depending on the heat load and humidity, and was condensing at 21C. Had to re-purpose an EEV from an old Daikin as I wanted the adjustability. On the whole it had a COP > 5 and it sounded like a brilliant idea until I found I spent an inordinate amount of time dealing with iron fouling of the filters, HX and re-injection bore.

    It was a fun experiment i control theory, but not one I'd do again.

  6. #806
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    Quote Originally Posted by scarry View Post
    A couple of buildings were done like that around here for the ducted AC units.

    By the time 2 yrs was up,every buried condenser circuit had leaks

    All the AC systems in the buildings had to be replaced.

    Taken to it's extreme the patch could be used as a Skating Rink. Obviously no thought at all given to the chilling of Earth's Molten core one day.

  7. #807
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    I guess that in most of Australia the desired purpose is for cooling a building, rather than heating. The units that I knew about where used for heating with the evaporator either buried or through a heat exchanger. The condensing coil was installed inside a duct if using air circulation for heating.
    Never saw one, but were led to believe that both free standing "radiators" and / or pipes buried in the floor were also used.
    I have no idea if they could be "reversed" to operate either way.

    I suppose that the local geology also has a big bearing on just what can be used, such as the mentioned high water table.

  8. #808
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  9. #809
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    Quote Originally Posted by rick130 View Post
    Geoscience
    Thanks Rick although I haven't got a ****ing clue of whats what the colour Green is really **** hot as is the pipework. I bet it got some getting used to.

  10. #810
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    Quote Originally Posted by rick130 View Post
    Geoscience
    That middle pic are the pipes going out into the field.

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