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 Post subject: Re: Bloody jobsworths
PostPosted: Fri Feb 08, 2013 4:00 pm 
retrobike rider
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Joined: Tue Jul 10, 2012 11:58 pm
Posts: 2362
Location: Bournemouth
I know no air transfers, just heat. Wasn't thinking. Sorry. I can go into the physics of it if you want, but it'll take forever, and be extremely boring.


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 Post subject: Re: Bloody jobsworths
PostPosted: Fri Feb 08, 2013 4:03 pm 
Retro Guru

Joined: Wed Apr 04, 2007 2:33 pm
Posts: 723
Location: Highlands
David B wrote:
Re. the fridge/freezer - apparently they do need to be in a room above a certain temperature otherwise they'll stop working purely because the thermostat thinks nothing needs doing. Fine for the fridge bit but not the freezer compartment.


I don't see how that can be right - why would the thermostat be measuring the room temperature in any way? Surely the thermostat should be measuring the temperature in the target environment, not the ambient temperature?

I read that the air around the condenser must be at "room temperature" for the condenser to work... but surely the condenser should work more efficiently if the ambient temperature is a bit lower than usual?

So far it only makes sense to me that these minimum ambient temperatures are those required to prevent the temperature in the fridge from dropping too low and the contents freezing... I'd be happy to be enlightened though!


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 Post subject: Re: Bloody jobsworths
PostPosted: Fri Feb 08, 2013 4:04 pm 
Special Retro Guru
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Joined: Mon Sep 29, 2008 11:34 am
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Location: Don't mess with monkeys, man
unkleGsif wrote:
those little ports are to drain off the condensate builds up from when the warm, moist air from the kitchen enters the cold, dry air inside the fridge when the door opens

frost free freezers have little heater elements that come on when in defrost mode i think, then the water drains out the back the same as with fridges, and onto a tray that sits above the warm compressor and evaporates

G

What I meant was with the frost free ones (and I thought the condensate wasn't just about warm air from the kitchen - or in my case, artic air from the garage - there'd also be the potential of condensate due to what was going on with the frost-free / auto defrost thing) - there wasn't the same degree of "closed system" in terms of the air - perhaps with the refirgerant gases - I mean who'd want them venting, eh - well maybe a little, just to top off the booze.

And there's also a fair point by Pyro Tim, heat will radiate out in terms of how the compressor is chilling the fridge. The frost-free ones just add a bit to that, 'cos mostly they add a little heat into the system to do the defrosting (either that, or cheat a bit with reusing some of the heat produced, rather ironically, to chill).


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 Post subject: Re: Bloody jobsworths
PostPosted: Fri Feb 08, 2013 4:05 pm 
Gold Trader / PoTM Winner
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Pyro Tim wrote:
I know no air transfers, just heat. Wasn't thinking. Sorry. I can go into the physics of it if you want, but it'll take forever, and be extremely boring.



So could I, but I have slept for just 8hrs in the last week, and really cant be ar$ed

G


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 Post subject: Re: Bloody jobsworths
PostPosted: Fri Feb 08, 2013 4:06 pm 
Karma Queen / Cake Meisterin
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Joined: Thu Jul 27, 2006 10:02 pm
Posts: 6736
Location: North Yorkshire
The chap told me that the freezer would stop but not why, sorry I cannot enlighten you :(

Alison


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 Post subject: Re: Bloody jobsworths
PostPosted: Fri Feb 08, 2013 4:08 pm 
Special Retro Guru
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ajm wrote:
David B wrote:
Re. the fridge/freezer - apparently they do need to be in a room above a certain temperature otherwise they'll stop working purely because the thermostat thinks nothing needs doing. Fine for the fridge bit but not the freezer compartment.


I don't see how that can be right - why would the thermostat be measuring the room temperature in any way? Surely the thermostat should be measuring the temperature in the target environment, not the ambient temperature?

I read that the air around the condenser must be at "room temperature" for the condenser to work... but surely the condenser should work more efficiently if the ambient temperature is a bit lower than usual?

So far it only makes sense to me that these minimum ambient temperatures are those required to prevent the temperature in the fridge from dropping too low and the contents freezing... I'd be happy to be enlightened though!

Well car air-con systems have thermal cut-outs, so that if the ambient is too low, the air-con compressor won't run - so that the evaporator doesn't ice up.

Probably a similar principle applies to a fridge, really. As I mentioned in another post, a fridge freezer I bought a couple of years back, had a think on the label about being suitable for garages and colder environments, so there's obviously some things they can do for fridges running in colder rooms.


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 Post subject: Re: Bloody jobsworths
PostPosted: Sun Feb 10, 2013 11:21 am 
Special Retro Guru
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Joined: Sun Apr 29, 2007 6:22 pm
Posts: 5946
Location: busy forgetting how to edge flip on a 11x11 monster cube///...
being a bloke i have no idea what a "wasshing machieen" is but i do know mine makes a cracking cuppa................


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