Previous in Forum: To Control the Water Level in a Tank   Next in Forum: Thermocouple Cable
Close
Close
Close
7 comments
Active Contributor

Join Date: Apr 2008
Posts: 17

Control Panel

04/30/2008 5:15 AM

Dear all,

I am designing PLC Control panel. Total hardware component heat dessipitation is 125 BTU. Now I need to select proper air cooling for this.

Panel has Air filter outlet at the bottom. Now I need to select proper capacity exhuast Fan at the roof of cabinet.

Could you pl. me someone to select the rating / capacity of this fan?

What is the design formula for the same?

Register to Reply
Pathfinder Tags: Control Panel
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Power-User
Hobbies - Musician - New Member Engineering Fields - Manufacturing Engineering - New Member

Join Date: Sep 2007
Location: Endless Mountains of NE Pa, USA
Posts: 298
Good Answers: 20
#2

Re: Control Panel

04/30/2008 11:23 PM

Hi mangeshkakade

There is an exhaust fan calculator here: http://www.louhoff.com/HVAC.htm

125 BTU is a fairly low volume of heat so you can probably get away with a small fan depending on the size of your cabinet. Also, check the components manufacturers specs for cooling requirements and base your total ventilation on the component requiring the highest amount of cooling.

Hope this helps you.

__________________
Courage is not the absence of fear, but the inner resolve to rise above it....or the inane lapse in judgement brought on by copious imbibitions....Egre Flagrus
Register to Reply
Active Contributor

Join Date: Apr 2008
Location: NorthEast WV
Posts: 10
#3

Re: Control Panel

05/01/2008 6:52 AM

Have you considered a Vortex Cabinet Cooler? Nice in helping to keep dust out of the cabinets, uses very little air and does a great job. We use a number of them in our facility. Here's one example:

https://www.exair.com/

__________________
"I have not failed.....I've just found 10,000 ways that won't work" Thomas A. Edison
Register to Reply
Guru
Australia - Member - New Member Fans of Old Computers - H316 - New Member Hobbies - Model Rocketry - New Member

Join Date: Jun 2006
Location: Port Noarlunga, South Australia, AUSTRALIA (South of Adelaide)
Posts: 3048
Good Answers: 75
#4
In reply to #3

Re: Control Panel

05/01/2008 8:08 AM

If you have a source of compressed air that you can use then as D-Tec suggested it might be worth looking at a compressed air vortex cooling tube.

I havn't used them myself but if your system is going into an area where contamination could be a problem they could prove to be very good as they are not only a source of cold air but can be used to pressurize the panel and keep contaminants out. The also have the advantage of not becoming clogged with dust a other airborne crap like a fan and filter.

This link will take you to the GlobalSpecs list of suppliers of compressed air vortex cooling tube.

__________________
An elephant is a mouse built to government specifications.
Register to Reply
Guru
United Kingdom - Member - Olde Member!! Engineering Fields - Instrumentation Engineering - New Member

Join Date: Jul 2006
Location: Dunstable, England
Posts: 2821
Good Answers: 45
#5
In reply to #4

Re: Control Panel

05/01/2008 9:23 AM

Ahhh thanks for that link Masu, I've been wondering about how those vortex tubes work this week - its good to see that wiki doesn't quite know either!!!

John.

__________________
A little knowledge is a dangerous thing - Googling is far worse!
Register to Reply
Guru
Australia - Member - New Member Fans of Old Computers - H316 - New Member Hobbies - Model Rocketry - New Member

Join Date: Jun 2006
Location: Port Noarlunga, South Australia, AUSTRALIA (South of Adelaide)
Posts: 3048
Good Answers: 75
#6
In reply to #5

Re: Control Panel

05/02/2008 1:29 AM

From what I have read elsewhere I don't think anybody knows for sure how they work. I must make the point of getting hold of one and playing about with it, apparently if you cascade them you can produce cryogenic like temperatures.

I have a CCD imaging unit on my astronomical telescope and the background noise created by stray infrared radiation in the CCD can be a real pain. You can use a technique called dark subtraction which works by taking a series of images with all the optics covered that are then subtracted from the real images, but you need to use different dark images for different temperatures. If you can add some sort of temperature lowering and stabilizing system that keeps the CCD at a constant temperature it makes things much simpler and produce clearer images. Most of the time it's done with a Peltier but a vortex tube might also be useful particularly as there are no moving parts like fans that could cause a vibration.

__________________
An elephant is a mouse built to government specifications.
Register to Reply
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32049
Good Answers: 838
#7

Re: Control Panel

11/11/2024 7:25 AM

<...125 BTU...> per second? Per fortnight?

Most control panel manufacturers drive the <...fan...> using a simple thermostat.

__________________
"Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Register to Reply 7 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Copy to Clipboard

Users who posted comments:

Anonymous Poster (1); D-Tech (1); Electroman (1); masu (2); PWSlack (1); snygolfgs (1)

Previous in Forum: To Control the Water Level in a Tank   Next in Forum: Thermocouple Cable

Advertisement