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Thread: Low temeperature metal treatment
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07-07-2012, 03:49 PM #1
Low temeperature metal treatment
Hi all .
I need to find a vendor for a chamber to hold aircraft alumniun parts at -40ºC or -40ºF
It shall be 20 ft (6 meter)length, 10 Ft wide (3 meter) , 10 ft Heigth (3 meter), inside size.
It will have a double door 2 meter by 2.5 m height on a end.
and 2 windows , at each side 0.80 x 0.80 meter
Loading rate is about 100 kG once per hour , with doors full open .
Incoming temperature 40ºC , cool rate to reach -40ºC , 6 hours.
When the doors are opened , the temperature shall not be upraise to -35ºC .
Air curtain , and PVC stripe shall be install , both at doors and windows.
Double 100% compressor and evaporator , as to have 100% backup.
No pre chamber allowed , by site space
This chamber is to stop aluminium hardening after heat treatment, to keep it soft until further processing the parts.
Thanks in advance
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08-07-2012, 04:49 AM #2
Re: Low temeperature metal treatment
look at liquid nitrogen spray system, cryogenics.
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08-07-2012, 09:18 AM #3
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08-07-2012, 09:21 AM #4
Re: Low temeperature metal treatment
It can be done with ease, your biggest question what deviation in temp can you have from -40C.
if you want -40C metal and average air temp, then the air being produced must be below -40C, then apart from opening what deviation can you go (upwards)
So basically the accuracy of control determines the type of system and then the cost of the system.
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08-07-2012, 03:33 PM #5
Re: Low temeperature metal treatment
The main fact is
When the doors are opened , the temperature shall not be upraise to -35ºC .
Then it must reach to -40ºC +/- 1ºC .
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09-07-2012, 12:29 AM #6
Re: Low temeperature metal treatment
Very tight conditions.
Your issue is that the air change rate with such big doors and such a small area, mean that it will be difficult to achieve your requirements. Not impossible.
Initial thoughts would indicate that you will require 4 systems (100% back up), and that your would require considerable space external to the chamber (sides and top) (a meter or so) Superior air distribution and evenness of temperature.
I hope you have a good budget for the project.
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09-07-2012, 01:35 AM #7
Re: Low temeperature metal treatment
What do you think about air courtains from inside , and PVC strip ovelapping 50%.
My other concerns is about the door gasket and it´s heating method, as it is a double side opening.
It is specified to have 100% backup, I do not understand what do you mean by 4 systems.
Thanks for any help.
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09-07-2012, 02:44 AM #8
Re: Low temeperature metal treatment
I think you need a dedicated low temp air curtain (*2) to basically reduce high temp air infiltration, and then a system (*2) for the load which is minimal and the load of the box iteslf. 4 system is total.
I would go for 2 air curtains, first just ambient, then second as stated above.
The plastic curtains, that does comes down to the product itself.
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09-07-2012, 05:21 AM #9
Re: Low temeperature metal treatment
Thanks .
Could you give me further details.?
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09-07-2012, 06:25 AM #10
Re: Low temeperature metal treatment
There is not much i can give on the concept side.
The rest is all detail, and a lot more detail is required to confirm concept, then design.
My advice is to fully understand the loading/unloading process (and what you are loading).
You may be best employing a consultant.
I think you should get some change out of 1/4million US$
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09-07-2012, 08:46 PM #11
Re: Low temeperature metal treatment
Thanks for your's tips. That amount seem to reasonable .
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05-08-2012, 03:59 PM #12
Re: Low temeperature metal treatment
You can try to look at different online store, they have the information that you need.
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05-08-2012, 11:12 PM #13
Re: Low temeperature metal treatment
Try this firm http://www.keighleylabs.co.uk/ they're not a refrigeration company they're a metalurgical company and they may be able to offer another option.
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