Building pressurization

Building pressurization

The air pressure within a building relative to the air pressure outside. Positive building pressurization is usually desirable to avoid infiltration of unconditioned and unfiltered air. Positive pressurization is maintained by providing adequate outdoor makeup air to the HVAC system to compensate for exhaust and leakage.
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•Indoor Air Quality Testing- IH/Building Sciences staff performs building IAQ assessments, thermogarhy, building pressurization analysis, cause & orgin evaluations for HVAC systems and mold, HVAV Hygienic Assessments.
Building pressurization involves balancing between outdoor air intake and exhaust.
Air handling systems equipped with demand control ventilation capabilities will bring in only the amount of outside air needed to maintain recommended carbon dioxide (CO2) concentration, which helps minimize energy use and cost expenditures, while maintaining proper IAQ levels and acceptable building pressurization. This is especially true for spaces that have varying occupancy levels.
The locations of the NPPs in the stairwells are shown in Figure 7 for various levels of building pressurization. Changes in the size of the elevator vent have a minor influence on the ability to keep smoke out of the stairwells.
An economizer cycle strategy requires many motorized parts that change the building pressurization and modulate the outside air dampers, return air dampers, and supply air.
Short adds, however, that no matter how good the seals and R-factor on the docks, energy conservation efforts will fail without building pressurization. Pressurization refers to keeping the level of air pressure higher inside the building than out, so that when there is an opening, air flows out of the building rather than in.
For buildings with commercial HVAC systems, building pressurization is the third component of radon remediation.
Indoor Air Quality Testing - IH/Building Sciences staff performs building IAQ assessments, thermography, building pressurization analysis, cause & origin evaluations for HVAC systems and mold, HVAV Hygienic Assessments
Due to the potential for interaction between the building pressurization and return fan control loops, extra care must be taken in selecting the parameters that determine the dynamic response of the digital filters and feedback controllers.
As addressed earlier, building pressurization and dehumidification should be considered for both systems.
Warm, humid climates will have different building pressurization and HVAC needs than cold, dry environments.
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