cooling electrical enclosures - data needed

[blfarrar]

Guys
I have need for some data on refrigeration type electrical enclosure coolers (these are sometimes fitted to CNC electrical cabinets)

I have a need to buy & cool some enclosures in a plant that use a process that uses steam so there is plenty of moisture & condensation - si ideally need to seal the "box"

if you could get back to me on blfarrar@yahoo.uk

Bruce L Farrar

 

[MintJulep]

You will never be able to guarantee a seal. If you could, then when the interior is cooled the pressure will also drop, possibly low enough to make it difficult to open the box.

If you are using standard contactors and relays, then any time they open against a load you create a little bit of ozone and a little bit of hydrogen.
Wires enter the box, maybe via conduits, right? How do you seal them?

Any time the box is opened moist air will enter.

Expect condensation and design to deal with it.

 

[AEBuck]

Consider a small packaged DX cooling system with supply air ducted to, and thus pressuring, each enclosure. Install a stub duct or conduit, equipped with a blast gate damper, on one knock-out in each enclosure to relieve only the amount of air required for cooling. You could waste this air, or if the system is large enough, install a traditional return duct system and introduce minimum outside through economizer dampers for pressurization. Use a generous quantity of supply air such that this air does not approach saturation upon exiting the cooling coil.

 

[jsummerfield]

Other enclosure coolers exist. The pneumatic Vortec coolers consume lots of air. The Vortec site has calculation software. Another device is the Peltier a.k.a. solid-state or thermo-electric cooler. These can also heat.

John