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josej
Power-User

Join Date: Mar 2008
Location: Mumbai
Posts: 250
Good Answers: 2

Panel Cooling Air

10/29/2009 1:32 AM

Hi , We have one Outdoor panel type IP 55, previously it was supposed to have only lamps and pushbutton But now it has many electronics , The climate is very hot harsh /cold so we have Vortex cooling for the panel to cool , theres is one Solenoid and thermostat for controlling the air and temperature Air is derived from instrument air line My question because of Bleeding of Instrument air continously will-- alarm condition for instrument pressure will exist in DCS , (This Instrument air Pressure is used as main interlock in other circuits) Regards JOSE
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PWSlack
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: 32175
Good Answers: 839
#1

Re: Panel Cooling Air

10/29/2009 4:21 AM

It depends upon the size of the air line coming into the equipment and the exhaust of the air from the panel, the line pressure, the low pressure setpoint, etc..

Suck it and see.

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_Leon_
Commentator

Join Date: Jul 2009
Posts: 63
#2

Re: Panel Cooling Air

10/29/2009 3:31 PM

Or,stick a dedicated panel cooler on it and forget the problem.

Use a water/coil type if chilled water is available,alternatively use a self contained refrigerant type.There are extreme ambient versions available.
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LG_Dave
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United States - Member - Member

Join Date: Dec 2006
Location: La Grande, Oregon U.S.A.
Posts: 468
Good Answers: 23
#3

Re: Panel Cooling Air

10/30/2009 12:52 AM

Run your vortex tube cold air through a coil of copper tubing that is inside the panel enclosure. Seal the tubing entrance and exit, letting it exhaust outside the enclosure. Cooling will be by convection between the air in the panel and the tubing. The panel can keep it's pressure constant.

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bioramani
Guru

Join Date: Jun 2009
Location: Bangalore, India
Posts: 725
Good Answers: 24
#4

Re: Panel Cooling Air

10/30/2009 1:24 AM

If the line can take the intermittent swiched flow of air to the Vortex tube without much pressure surges, it may be ok. You can try adding a buffer chamber to the vortex inlet, which may minimize this effect.

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shahand
Associate

Join Date: Sep 2009
Posts: 32
Good Answers: 1
#5

Re: Panel Cooling Air

10/30/2009 10:42 AM

It sounds like you need a seperate air line for the Vortex ?
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naveen_menon
Commentator
India - Member - Naveen Menon Engineering Fields - Instrumentation Engineering - Naveen Menon

Join Date: Oct 2007
Location: India
Posts: 92
Good Answers: 2
#6

Re: Panel Cooling Air

11/05/2009 2:41 AM

I do not think its a great design to use your instrument air which is a interlock for your normal plant operations for cooling purposes, even if you are using that why is the back pressure regulator not installed to ensure that the pressure fall is limited to above your interlock value, The regulator will always take a feedback from the line pressure before the regulator and maintain the pressure.

Best remove this inst air line , if it is harsh and cold place a thermostat and a heater arrngement and a panel cooler. That shoild take care,
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suhasdh
Associate

Join Date: Sep 2009
Posts: 25
#7

Re: Panel Cooling Air

11/05/2009 12:39 PM

Your situation is same as we were having before. We also've an outdoor panel containing SCADA in industrial PC, PLC, many electronic cards & electronics in it. The temperature of the panel was too high and our PC was always getting hanged due to high temperatures.

So to avoid it we'd installed a panel A/C and now all of our problems are solved.

I guess you've got your solution.
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Padmanabhan Iyer
Commentator

Join Date: Jul 2008
Posts: 63
#8

Re: Panel Cooling Air

11/08/2009 9:20 AM

The best and economical sensible cooling of the panel is with air/water cooler used in desert. A portable paded air cooler feeding air from bottom of the panel to be exhausted from top across by a minature panel fan.
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Users who posted comments:

_Leon_ (1); bioramani (1); LG_Dave (1); naveen_menon (1); Padmanabhan Iyer (1); PWSlack (1); shahand (1); suhasdh (1)

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