×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Humidity Control Actuators

Humidity Control Actuators

Humidity Control Actuators

(OP)
Hi All,

I'm looking to do some testing of power conversion equipment at elevated relative humidity in the near future. Compared to many applications, these systems have higher power dissipation and sizes which are potentially too large for typical environmental chambers. I'm interested in the possibility of making our own temperature/humidity controlled enclosure for flexibility and considering the power handling requirements in particular.

Can anyone recommend an off-the-shelf humidity actuator that would be appropriate and capable of operation at elevated temperatures (max temp between 40-85 °C depending on negotiated test values and practical limits)? I have seen ultrasonic, bubble, boiling, and wick/fan based approaches but haven't seen anything marketed for industrial/scientific applications. Near term expectation is for ~30-50 cubic feet (possibly up to ~1000 cubic feet) and to use heaters/air-air exchangers to regulate temperature in a closed system. Probably I'm looking in the wrong places for actuators...

Any other practical advice/lessons learned would be greatly appreciated!

RE: Humidity Control Actuators

I have used environmental test chambers large enough to pull a car into, chances are there is a local test house that has one big enough for your application.

Where are you located?

If there is a local shop, are you open to renting the use of a chamber at a rate of ~$300/day for your low end of 30 cubic feet? Sorry but I don't remember what the large one cost, it was a long time ago.

RE: Humidity Control Actuators

(OP)
Voltage and power levels are high enough that it's awkward to do elsewhere (1500VDC, >50 kW processed, ~1kW dissipated by UUT and at least one of the specified tests will be for an energized/operational unit requiring setup/support on-site).

That's certainly a reasonable rental rate. I'm partly comparing to HALT/MEOST chamber rentals at ~8x your indicated rate. I'm in southern CA, so a good selection of local test sites if we outsource.

RE: Humidity Control Actuators

The test lab would likely have 440 VAC available, you would need to bring the equipment to go from there but I don't think the thermal load would be an issue, though it may drive you to a bigger chamber than you might need space-wise. I would suggest trying to rent if you can, save yourself a lot of headache when you can't reach one corner case or another with a home made chamber and need to start over.

HALT chambers have the shock and vibe stuff integrated so they would be more expensive. I am surprised at 8X though.

Element and NTS are the local ones we use around here. Looks like both have locations in the LA area.

RE: Humidity Control Actuators

Rather than specifying a chamber, I would suggest you specify the specific test conditions and let the test house figure what they can do; you otherwise run the risk of overconstraining the test house

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close