Do vacuum Ironing boards cause negative pressure in my Space

Click For Summary

Discussion Overview

The discussion revolves around the implications of using vacuum ironing boards and related vacuum equipment in a laundry building, specifically focusing on whether the extraction of air and moisture through vacuum outlets creates negative pressure within the space. Participants explore the mechanisms involved, potential solutions for maintaining positive pressure, and relevant HVAC codes.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant questions whether the vacuum outlet can be considered an actual outflow from the space, suggesting it may contribute to negative pressure.
  • Another participant emphasizes the importance of municipal HVAC codes that require outside make-up air flow, implying this should mitigate negative pressure issues.
  • A suggestion is made to provide fresh air to maintain positive pressure using a variable frequency drive motor controlled by a differential pressure sensor.
  • Concerns are raised about the complexity and potential dangers of designing the HVAC system without professional engineering oversight.
  • One participant recommends managing and distributing incoming air through filtered and ducted air conditioning rather than relying on passive vents, considering the significant volume of air being extracted.
  • A participant advises considering a heat exchange system to recover heat and moisture, noting the potential benefits depending on the local climate.
  • Another participant suggests joining ASHRAE and consulting their handbooks for comprehensive guidance on HVAC design and relevant building codes.

Areas of Agreement / Disagreement

Participants express differing views on the implications of the vacuum outlet on building pressure, with some emphasizing the need for make-up air while others focus on the technical mechanisms involved. The discussion remains unresolved regarding the best approach to manage the air flow and pressure dynamics.

Contextual Notes

Participants highlight the need for detailed design considerations and adherence to building codes, but specific assumptions about the system's operation and environmental factors remain unaddressed.

tj00343
Messages
59
Reaction score
0
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.
 
Astronomy news on Phys.org
Most municipal HVAC codes require some amount of outside ‘make-up’ air flow. This should be sufficient.
 
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.
 
tj00343 said:
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.
 
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...
 
  • Like
Likes   Reactions: Asymptotic and russ_watters
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.
 
  • Like
Likes   Reactions: Asymptotic, Nik_2213, anorlunda and 1 other person

Similar threads

Undergrad Questions about Negative Pressure and Vacuum Energy
  • · Replies 5 ·
Replies
5
Views
3K
Graduate Is Gravity Caused by the Motion of Particles in the Fabric of Space?
  • · Replies 463 ·
16
Replies
463
Views
74K
Chemically regenerating my auto's catalytic converter?
  • · Replies 19 ·
Replies
19
Views
9K
How bright is the future of Maglev Cars?
  • · Replies 19 ·
Replies
19
Views
12K
Civilization of millions of rings.
  • · Replies 3 ·
Replies
3
Views
5K
Graduate Hydrogen-Boron Plasma Toroid Fusion
  • · Replies 4 ·
Replies
4
Views
7K
Graduate Hydrogen-boron High Density Plasma Toroid Fusion
  • · Replies 3 ·
Replies
3
Views
4K