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 Post subject: Freezers
PostPosted: Wed Jul 18, 2018 8:33 pm 
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What's the coldest you can get a freezer down to? A normal freezer that is, I'm not looking for superconductivity levels here!

If the standard thermostat could be wound past the end stop (say instead of set to 5 (max) wind it 'theoretically' past from 5 right up to (say) 11) would the freezer just get colder? OK, I appreciate the compressor would be running a lot but if you could get the compressor to run 24/7, any idea how cold a freezer would eventually get to?

I know there are two main coolants R600a and 'something-137???' - has the banning of CFC's made cooling more difficult? And what is the effective cooling difference between the R600 and 'the other' coolant?

Simple reason - I have a freezer that works but I'd like to see if I can get it to cool to (say) -25C (just for the fun of it!) but the limitation, currently, is the end stop on the thermostat. Not a problem as I can replace this with my own digital controller and set it to whatever - but if this would cause the compressor to blow its guts out then I'd be a bit more cautious.

I think the compressors are good for constant operation - but don't know for sure???

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 Post subject: Re: Freezers
PostPosted: Wed Jul 18, 2018 8:54 pm 
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boost/superfreeze /load up freezer setting leaves it running

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 Post subject: Re: Freezers
PostPosted: Wed Jul 18, 2018 9:02 pm 
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I would doubt the compressors have a continuous duty cycle, depends on the quality of the freezer I guess. Theoratical maximum I can see for a compressor driven freezer is about -50


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 Post subject: Re: Freezers
PostPosted: Wed Jul 18, 2018 10:57 pm 
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I have an idea to force-air cool the compressor and fit a thermal cut-out (just in case!) and see how low it can go - and for how long!

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 Post subject: Re: Freezers
PostPosted: Thu Jul 19, 2018 7:47 am 
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Be interested to see how you get on with that. Are you able to exhaust the air from the heat exchanger outside too?


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 Post subject: Re: Freezers
PostPosted: Thu Jul 19, 2018 3:13 pm 
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I'll be making arrangements to vent to the outside but only on a passive basis. I might extend to forced extraction if the room gets too warm.

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