Design of a Thermal Vacuum chamber

[JCastas]

Hi Folks!
I on a situation a little bit confusing.
I have an future activity to design the architecture of a multi-function vacuum chamber that could do thermal tests.
The features that i want are:
1º - Cryogenic tests with LN2. This is a typical and easy design. The set point is controlled with PID heaters.
2º - Do tipical space qualifing thermal cycling for equipments and components, with temperatures range arround -50ºC and 80ªC. With this i was thinking to use a thermal bench fixed with a copper tube (condensator) connected to the refrigeration machine. This refrigeration machine would decrease or increase the temperatures depending on the set point. The set point is then controlled again by electric heaters attached to the bench that would do the PID control (the fine tuning) and the refrigeration machine would follow (,aybe it will do only cooling) the electronic setpoint but with an offset of -5ºC.
I'm asking to you some help in order to understand if the refrigeration implementation is easy, what are the key factors to do this? Is there any brand in the market that do this things?

Thank you for you time.
cheers.

http://pwp.net.ipl.pt/alunos.isel/32444/

 

[IRstuff]

You stated that this is a vacuum chamber, so how will regular heaters work.

I don't know what they do for cold, but for hot, the general approach is to use heat lamps, ideally, those that can simulate the solar spectrum

TTFN
faq731-376

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[chicopee]

If I understand your OP, you would like the refrigeration system to produce temperatures between -50dC to 80dC within the vacuum chamber?

 

[JCastas]

Hi!
Yes you are right IRSTUFF. to simulate the solar spectrum would be nice to use a Lamp but i'm not simulating satellites external surface, this is ionly for electronic parts and lasers. I'm interested only in InfraRed spectrum.

Yes Chicope, the ideia is to use a ULTRALOW-TEMPERATURE REFRIGERATION, see in ashrea standards SI_R10_Ch48_.
The ideia is to use a pumping and condensor system as an external equipment to send cold fluid to the evaporator that is in the vacuum chamber. This is controlled like by a electronic valve that produces a variable flow for the cooling evaporator.

My dificulty is only to understand if there is any plug an play barands that sells this systems...

thank you.
João

http://pwp.net.ipl.pt/alunos.isel/32444/