Number of change of air in a bulk warehouse

[Johnnathan]

Actually, We have to design the ventilation
system for a bulk warehouse. A recomendation that we are following is to achieve two changes of air per hour in all the warehouse.
I want to know if you have any other standard for that particularly case.

Thanks in advance for your help.

Johnnathan Diaz


"Estimados,

Actualmente tenemos una apliación en la cual es necesario diseñar el sistema de ventilación en un almacén para concentrado. Una de las recomendaciones que nos han indicado es considerar dos renovaciones x hora.

Quisiera saber si alguno de ustedes ha participado en el diseño de una aplicación similar y cual ha sido el numero de renovaciones utilizadas.

Saludos"

 

[PAN]

2-4 air changes per hour...

However,I used to see a paper. It said one air change per hour can produce the desired conditions in the space when using pressurized methods.

 

[BigInch]

What you need or want could be highly dependent on what it is you are storing in the warehouse. I would think that cans of gasoline would require a very different number than would bottles of Coca Cola.

Let your acquaintances be many, but your advisors one in a thousand’ ... Book of Ecclesiasticus

 

[Johnnathan]

That is right!! I would store in one case Zn, another case Pb and in the last case Cu.

I would like to know the paper in which the numebr of change of air is recomended.

thanks in advance for your help.

 

[BigInch]

I don't think that part of the question qualifies this as a pipeline or fluid dynamics question.

Let your acquaintances be many, but your advisors one in a thousand’ ... Book of Ecclesiasticus

 

[PAN]

http://www.eng-tips.com/threadminder.cfm?pid=100

 

[cloa]

Or perhaps Occapational safety

http://www.eng-tips.com/threadminder.cfm?pid=283

 

[BigInch]

Why is any change of air needed at all? It's not like sacks of zinc, lead and copper are highly volatile. Do you really care if the air gets old? I'd guess that 2 changes per hour would be way more than sufficient.

Let your acquaintances be many, but your advisors one in a thousand’ ... Book of Ecclesiasticus

 

[pipesnpumps]

This is a question for the HVAC forum..

You should calculate the amount of heat gained across the roof, and walls, plus the internal heat loads due to lights. Including solar heat gain. This can only be done effectivaly with software. The total of all heat loads is Q.

Q = 1.08 * CFM *(Te - To)

Q = total of all sensible heat loads
CFM=required flowrate of air (cu ft/minute)
Te = Temperature of exhaust from building
To = Temperature of air outside building (air entering the warehouse via louvers)

Use (Te-To)=10 deg F, and solve the equation for CFM. For example, if the design temperature for the area is 93 F, then the exhaust from the building will be 103 F.

If the exhaust temperature is 104 deg F or higher, then you can't have major electrical equipment like motor control centers in this space, because they are generally rated for 104 F maximum. Put them in a room with Air Conditioning, or increase the ventilation to maintain 104 F max at design summer conditions.

As for the paper for calculating this, this formula is on every psychometric chart ever made, and in every HVAC book ever written.



Real world knowledge doesn't fall out of the sky on a parachute, but rather is gained in small increments during moments of panic or curiosity.