Ok engineers, I need more homework help - Chicagoland Sportbikes
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post #1 of 12 (permalink) Old 03-31-2008, 12:51 PM Thread Starter
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Ok engineers, I need more homework help

Man I hate this pneumatics class.

I am supposed to draw a simple diagram of a pneumatic control system for a vav chilled water system.

anyone have any idea what this should look like?




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post #2 of 12 (permalink) Old 03-31-2008, 01:05 PM
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tony

first you say VAV that is varible air volume. do you want to varry the water flow thru a coil. if so would you be using a two way or three way control valve?

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post #3 of 12 (permalink) Old 03-31-2008, 01:09 PM Thread Starter
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Thats whats confusing me. this teacher is an idiot. he says we need to draw a vav pneumatic control circuit. then passed around a hat with numbers in it. i ended up with chilled water, i'm just looking for the simplest design possible to make it work.

its a pneumatics class so his focas is on the controls that make the pneumatics work.




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post #4 of 12 (permalink) Old 03-31-2008, 01:20 PM
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it is hard to say without knowing what he is looking for. i would make sure that you include a t-stat, and a control valve on the chilled water coil. is he looking for one zone or multiple zones.?

ps you should get extra bonus points if the symbol on the valve actuator is square for pneumatics not a circle for electric.

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post #5 of 12 (permalink) Old 03-31-2008, 01:24 PM
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For the controls: Are you basing your controls on a pneumatic temperature controller, or can it be electro-pneumatic using a PLC based temperature control, or could it be a simple thermal sensor driving a 3-15 psi pneumatic signal to a temperature control valve.

There are a LOT of options here. I know you said VAV, but are you only allowed to varry the air volume, or can you hold the air flow the same and regulate the cooling/heating input?

I haven't dealt with VAV's before, but I do a lot of my other options listed above. Most of our stuff is using PLC based controls, with pneumatic control valves.

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post #6 of 12 (permalink) Old 03-31-2008, 01:31 PM
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Just put the control valve on the outlet of the coil to make sure you don't have air come out of solution in your coil.

Have a thermostat delivering a 3-15 psi air signal proportional to the required temperature range to the valve positioner. Example: As temp rises, then your air signal would rise to open the valve further.

Your thermostat could also send a 4-20mA signal to an I-P (current to pressure) to scale the air signal for the valve.

Lots of options

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post #7 of 12 (permalink) Old 03-31-2008, 01:35 PM Thread Starter
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Simple as possible. we dont need to go nuts here. a simple t-stat design would work.




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post #8 of 12 (permalink) Old 03-31-2008, 01:37 PM
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+1 on what stkr said

or tell them to get rid of all pneumatics since it is not the 1950's

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post #9 of 12 (permalink) Old 03-31-2008, 01:39 PM Thread Starter
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LOL, I just need a simple drawing here guys, I'm not reinventing the wheel here.

t-stat, single or maybe dual zone. vav, chiller, pnuematics control circuit. Help




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post #10 of 12 (permalink) Old 03-31-2008, 01:41 PM
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So when you get this new yob, are you going to be posting up asking how to install A/C units?

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post #11 of 12 (permalink) Old 03-31-2008, 01:41 PM
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Quote:
Originally Posted by HDTony View Post
LOL, I just need a simple drawing here guys, I'm not reinventing the wheel here.
You wanted simple and you posted your request on clsb?
You should fail just for that


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post #12 of 12 (permalink) Old 03-31-2008, 02:00 PM
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Okay...I spent some time in that wonderful graphics program we all know as "MS Paint" , and this is what I came up with.

The thermal sensing bulb has an impulse line going to a pneumatic regulator. The change in temperature creates a pressure change in the volitile liquid in the impulse line which causes the air regulator to change its output proportionally. This air output goes to the lower side of the diaphram on the control valve positioner.

As temp increases, the valve opens to allow more chilled water through the coil. Therefore, more cooling.

They actually have control valves that are controlled directly from the sensing bulb, and are stand-alone, but that wouldn't do you any good for a pneumatics class.

Note: Replace the sensing element with a thermostat, and send the electrical signal to the same air regualtor but call it an I-P converter. It's probaly more of what they're looking for.
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File Type: jpg temp control.JPG (30.2 KB, 19 views)

Midwest Track Day CR #130
NESBA 130-Control Rider (Former Midwest Region)
STT "A" 130
Track: 2006 GSXR-750
Street: 2011 H-D Ultra Limited (Road Sofa)

www.MidwestTrackDay.com / www.MidwestTrackDay.motorsportreg.com / www.facebook.com/midwesttrackday

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