Basically Stoner, you are building a big fat wonderfully Heath Robinson version of this:
http://techgage.com/article/zalman_reserator_1_v2_and_fan_kit/
Can we all pop round for a glass of Chateau Latour?
If I had the time, the inclination, or the ability to recall 10-year-old engineering classes, I would do the sums for you... I may get bored enough at some point, but I'm sure someone who's more up-to-date than me will get there first!
I shall start collecting the bits I need then
No Latour, but a few nice Savennieres.
Cheers for all the help guys.
As an addition, you could increase the thermal mass of the store iteself, by putting a [i]pond[/i] in below the wine racking - say a foot deep?
Reminds of some trouble they had at Edinburgh Botanic Gardens when they drained one of the ponds inside one of the glass houses. They couldn't get the temp regulation right for ages afterwards 😐 - dopey gets!
Chb is talking about the R12 gas which was fun when brazing! Also the only gasses which are non ozone depleting are ammonia and propane, the rest are subject to the f-gas regulations.
Basically, you will get some cooling effect from what youre trying i dont think that you'll be able to hit 14degC with it though. Assuming ground temp of 12degC and a rough deltaT of 6K, you'll be looking at 18degC IF the system is sized correctly. I reckon that, at the flow rates you'll get off small pump and the thermodynamic qualities of water that the indoor coil you'll need would be huge particularly without a fan.
If you do bastardise a fridge, you'll need a line tap valve for the compressor stub, a turbo torch, some gas, manifold gauges and preferably some oxygen free nitrogen, a vacuum pump; it goes on.
Stoner - a lot of Passivhaus air systems are based on air intake heat exchangers:
[url]= http://www.passivhaustech.com/archive/wordpress/04/2011/air-intake-ground-source-heat-exchanger [/url]
[url= http://www.builditsolar.com/Projects/Cooling/passive_cooling.htm ]Useful passive cooling info[/url]
I was in a shelter in the Mojave Desert last week - 118F air temp outside. There were 3 double ducts about 40' long feeding into a box in the corner that was running a 4A 24V solar-powered fan. Air temp inside was about 78-80F and this was only achieved through air-ground heat exchanging in the ducts. It has been working like that for 18 months!
That second link has evaporative cooling as mentioned in my earlier post, which is the manner in which tootalls original idea works also.
Stoner, as you've already found out you can insulate all you like and the space will still heat up if it's an enclosed space. You need more thermal mass like exposed stone, concrete or brick, (high density materilas) . A big barrel of water will help in that way as well.
thanks for all the links etc.
will read up and come up with a feasible design based on the space, layout and resources I have.
EDIT: BTW wonny, the slab in there is about 6-12" thick concrete (uninsulated) about 150sq ft. Its a massive bit of thermal mass.
It was made with the (larger than expected!) balance load from a floor slab fill for the barn
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My original suggestion isn't evporative cooling - it is using the duct in the ground as a heat exchanger.
If you're blowing air over water, the water will evaporate and provide cooling ( providing the rh isn't too high). That's evaporative cooling.
wrecker - I can't see that I mentioned water once. I mention pipes, fan and air. I know what evaporative cooling is thank you very much.
I would have thought that the most obvious solution is to have a temperature alarm 'thingy', and when the temp is too high, it auto-posts on STW annoucing a party at Casa Stoner? The reduced number of full bottles in the store will help the other bottles calm down a bit.
I'm a simpleton, but... Could you replace the racking with something with more thermal mass? A 'shelf' of stone or slate every few rows?