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Brew fridge

Discussion in 'DIY Projects' started by Hangover68, 9/2/20.

 

  1. Blackman

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    Posted 10/2/20
    Foam door
     
  2. Grmblz

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    Posted 10/2/20
    Foam door with glass as an option.
     
  3. koshari

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    Posted 11/2/20
    pretty much my thoughts as well, and heres another tip, "Propane" if you top the charge up with a bit of propane it may begin working again, propane is already categorized as a UN refrigerent and present on some refrigerent mixes eg R290. its also one of the best refrigerants and readily available without requiring a licence to obtain it..
     
  4. Hangover68

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    Posted 12/2/20
    Will propane mix ok with R134a ? if there is any left that is.
     
  5. KegLand-com-au

    www.KegLand.com.au - A Land of Stainless Steel AHB Sponsor

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    Posted 12/2/20
    Thanks for your replies on the RAPT fridge guys. We really appreciate your feedback.

    It seems like foam foor is definitely the way to go and I think most of us feel the same way so we will go with foam door and then have the glass door sold as a separate additional part. This has the slight added advantage that the foam door is a bit cheaper to make and also will enable us to keep the price on the base fridge model a bit lower.

    We would totally agree with you on hydrocarbon based fridge. It's strange that many refrigerant technicians in Australia are still dubious about hydrocarbon refrigerant gasses due to flammability but with respect to electrical efficiency, peak current draw, refrigerant pressures, and environmentally the R290(propane) and R600a(isobutane) are significantly better than the flurocarbon and hydro-flurocarbon based gasses gasses. Europe have already largely moved to hydrocarbon gasses but in Australia we are a bit slow unfortunately.

    We certainly will be using the R600a (isobutane) gas and for this particular temperature range (-2 to positive 50C) set temp on the RAPT fridge the R600a gas is normally the best choice. It would be possible to use R290 however R600a also does not require a licence to obtain and is really more suitable for this particular product.

    We phased out the use of R134a quite some time ago already and I really can't believe that new products are still hitting the shelf with this gas type.
     
    koshari likes this.
  6. Bob65

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    Posted 12/2/20
    Do you have any idea when the RAPT fridges will be back in stock?
     
  7. koshari

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    Posted 12/2/20
    it will, i have a mix of r134 and propane in my triton atm, if there is no gas left straight propane will be fine, you should consult the pressure/temp tables for the gas pressure but generally speaking just adding a little bit at a time untill it starts cooling will do it, its mot like you have both high and low pressure ports to connect the gauges up to anyway with just a bullet connector. prolly more important that the refrigerant oil hasn't got out or the compressor will seize, having said that if ita running still and not cooling its a fair indicator that there is still oil in the system.
     
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  8. koshari

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    Posted 12/2/20
    Same people are happy to use BBQs and LPG cars.

    i suspect it has a little bit more to do with the fact that they are licensed to aquire the other gasses and hydro based gasses dont require such licensing.
     
    Last edited: 12/2/20
  9. KegLand-com-au

    www.KegLand.com.au - A Land of Stainless Steel AHB Sponsor

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    Posted 12/2/20
    The RAPT chamber hopefully will be finished in about 4 months. We are only just about to start the electrical compliance process. Sorry about the long wait.
     
  10. KegLand-com-au

    www.KegLand.com.au - A Land of Stainless Steel AHB Sponsor

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    Posted 12/2/20
    I would absolutely agree with this statement. As other HCFCs, CFCs, and HFCs are controlled substances substantial barriers to entry to manufacture, import and distribute these gasses exists which is how it's run by this duopoly. Large companies like DuPont and General Motors are able to sustain large markup in these gasses due to these barriers alone.

    I recently went to a seminar on the transition to hydrocarbon gasses and it was sponsored by one of these companies and as a result it became a smear campaign not to use hydrocarbons.
     
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  11. Grok

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    Posted 12/2/20
    Be careful about mixing gases, there are a few different types of compressor oils that don't always mix properly with certain gases, and you can stuff your compressor up, Do some research !!!!! Also, because of flammable gas in the system, you are supposed to have solid state relays on the compressor and closed sealed switches etc to minimise any ignition sources, plus a flammable gas sticker in close proximity so the next frig tech knows whats in the system. If a compressor is designed for a certain gas, it may not be suitable for another gas, its to do with gas pressures and densities.
    Heres a tip, if you want to get your hands on some R134a, check out some electrical and engineering "freeze sprays", look at the propellant or SD sheet.
     
    Last edited: 12/2/20
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  12. Josh Dodd

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    Posted 12/2/20
    Holy Crap. That looks cool. Kind of wish I'd picked up one of these instead of my Series 4 Kegerator!! Able to hold four full-size kegs and two half-size is insane. You should make a Kegerator version with this with a four or six tap font fiitted to the door.
     
  13. koshari

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    Posted 13/2/20
    good post grok, saved me typing out all these disclaimers :bigcheers:
     
  14. KegLand-com-au

    www.KegLand.com.au - A Land of Stainless Steel AHB Sponsor

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    Posted 13/2/20
    Yes I think we will have to make some RAPT kegerator units as you have suggested.
     
  15. Hangover68

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    Posted 13/2/20
    Yes, wont be mixing gases and already had a discussion with some one on another forum i frequent about using freeze spray as a top up so thats my plan.
     
  16. Hangover68

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    Posted 23/2/20 at 8:39 AM
    Well i fitted a bullet valve and gave the fridge a top up gas charge with R134a and its happily cooling away at 2c, now to setup my inkbird 308 ready for my next brew.
     
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  17. Hangover68

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    Posted 26/2/20 at 12:33 AM
    Replaced my broken fermenter with a couple of cubes which fit nicely in the fridge, pity i cant fit 2 side by side but not quite enough room.

    BREW FRIDGE.jpg
     
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