5'x5'x3.5' Freezer for testing

[jclarke@thermal]

I am building a test chamber to test for condensation in a tubular skylight. I want to create freezer-like temperatures at the top of the tube (to create exterior winter conditions) and then in heat up the interior of the chamber.

How should I go about building a freezer to create a cold condition? Can I cut the bottom of a freexer out to fit the top of the tube through?

Any suggestions?

[Isaac-1]

I am new here too, but if it were me and I was looking to do this on the cheap side and had an elevated platform at the height of the top of the sky light that would hold a few hundred pounds of weight, here is what I would do. I would get a used slide top ice cream display freezer (these are designed to keep the contents at -20F, much cooler than most other similar sized freezers), it seems the cabinets, and glass slide tops often wear out on these units before the refrigeration equipment does around here I know of running units selling in the $300-500 range. Then cut out a section of the front/bottom away from the compressor (these units usually have the compressor/condenser in a cut out box on one end and the evaporator along the inside top , and build a ducted box over the top of the sky light from blue board or other styrofoam board insulation.

Ike

[mad fridgie]

You are putting the chicken before the egg.
For your test you need a time line for condensation to occur. During this time you will get some level air movement. This air movement equal refrigeration load. The load is likely to exceed that of what you freezer can handle, you freezer temp will start to warm. You loose control of your test, which then becomes pointless.
You need a store of cold (laymens terms)
best way and cheap build box around the cold end introduce dry-ice or CO2 (you can get from the pub) add as required to maintain a constant temp.
Cheap and repeatable.

[Magoo]

MF you have described it perfectly.
I thought you were skivving off in the UK. When are you home, we need a catch up.
Magoo

[mad fridgie]

MF you have described it perfectly.
I thought you were skivving off in the UK. When are you home, we need a catch up.
Magoo
Back in the land of the long white cloud
Mad