VAV questions? 4

[hepa99]

Need to know where can I found VAV basic to complicated information - that's including control and other accessories information.

I have project that we need to commission that's include lots of VAV.

Another question: if I need to get the VAV total static pressure is it the same procedure as how you compute the AHU FAN total static pressure?

 

[KiwiMace]

The manufacturers catalog?

 

[MechEngNCPE]

As Kiwi said, that info is in the VAV terminal manufacturer's catalog. It will have static pressure losses as well. If there is a reheat coil on it, you need to include the static pressure loss on that as well.

 

[mauricestoker]

For general to CxA issues, take a look at

peci.org

 

[xpsboy]

Kiwi, I'm new with VAV. Do you have recommended VAV catalogue that I can google?

 

[cdxx139]

Price has great learning modules.

knowledge is power

 

[MechEngNCPE]

Titus has a good online catalog.

 

[KiwiMace]

The best catalog is from the manufacturer of the equipment you are commissioning.

 

[mauricestoker]

http://www.peci.org/ftguide/

Above site has controls, design, checklists and functional test guides for commissioning VAV.

http://www.energydesignresources.co...vanced-variable-air-volume-(vav)-systems.aspx

Download for EDR advanced VAV design.

Between the two, I think you should be able to get answers on most VAV issues.

 

[xpsboy]

Cdxx139 you suck!

Thanks for the guys who share. Help me a lot.

 

[cdxx139]

Hey boy,

Im not trying to charge you, I was talking about Price the VAV box manufacturer.

http://www.price-hvac.com/Media/trainingModules.aspx

It was very helpful to me when I was starting out.
Its gut nice pitures.

knowledge is power

 

[xpsboy]

Thanks cdxx139, my bad.

The link is great do you have the VAV "Box" too? They have excellent information on VAV diffuser.

 

[MechEngNCPE]

http://www.titus-hvac.com/

Go to "terminal units" and there will be info on all types of vav boxes. Titus is an industry standard manufacturer so the cfm and pressure drops should not change too much between manufacturers like titus, price, metalaire, but if your talking phoenix boxes or some other manufacturer then you need to look an their website.

 

[donzie26]

Is it applicable to use 2 accu for one fcu only?

 

[xpsboy]

Hi MechEngNpe,
I browse the titus website and I look for one of vav boxes. Data are based on 180f entering water and 75f entering air. What will be the recommended delta T for air and water?

Btw this is fan powered - parallel.

 

[MechEngNCPE]

Do an energy balance. Water delta T's are usually 20 or 40. The air off your coil should be no more than 90dF, it is usually around 80-85. Remember to find your tmix with the supply air and the plenum air. Plenum air around here is usually about 68dF and primary air 55F. Find the tmix, then use the qroom to find the qcoil.