Do vacuum Ironing boards cause negative pressure in my Space

[tj00343]

Hey,
I'm designing an HVAC system for a laundry building. I have vacuum equipment (Vacuum press and Vacuum Ironing boards ) in the space which have a vacuum outlet the is taken outside the building through individual ducts. When all machines are operational, 877 l/s of hot air and moisture would be extracted to the outside. My question is does this air come from the space it self and does this cause negative pressure in the building if it does and what are the usual solutions for dealing with this kind of case. I was thinking about providing fresh air to maintain positive pressure with a variable frequency drive motor controlled by a differential pressure sensor.

 

[AZFIREBALL]

Most municipal HVAC codes require some amount of outside ‘make-up’ air flow. This should be sufficient.

 

[tj00343]

What I wanted to know was in regards to the actual mechanism of the machine. Can we consider the vacuum outlet as an actual outflow from the space.

 

[russ_watters]

What I wanted to know was in regards to the actual mechanism of the machine.

You haven't provided enough detail to design it. Do you have a professional engineer designing this system for you? This type of facility is potentially pretty complicated and dangerous if not done correctly.

Can we consider the vacuum outlet as an actual outflow from the space.

It is.

 

[Nik_2213]

Not far short of a cubic metre per second ? You will get leakage around doors and windows, but I'd recommend you 'manage' and distribute the in-flow via filtered and ducted air-con rather than passive perimeter vents.

Have you considered a heat exchange system ? You will be discarding a LOT of heat and moisture. I don't know your location or climate or weather range, but such may represent useful resource...

 

[jrmichler]

That's almost 2000 CFM of warm humid air. Join ASHRAE. Get their handbooks. Read the Handbook of Fundamentals first. The answers to all of your questions are in there. They also answer the questions that you do not yet know to ask. Those are even more important.

You also need copies of relevant building codes. Building codes have rules for dealing with exhaust air flow and makeup air.

Do not try to reinvent the wheel. Find the right way, then adapt it to your specific requirements.