Ventilation effectiveness

Ventilation effectiveness

The system’s ability to remove pollutants generated by internal sources in a space, zone, or building. In comparison, air change effectiveness describes the ability of an air distribution system to ventilate a space, zone, or building.
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However, there are few publications documenting measurements of ventilation effectiveness and thermal comfort in buildings with UFAD.
It was found that the use of a secondary PV system in conjunction with a primary air-conditioning system in a hot and humid climate can efficiently enhance thermal comfort and improve the ventilation effectiveness at the immediate breathing zone by up to 50% more than can be obtained with mixing ventilation (MV) alone (Sekhar et al.
26 states that Ventilation effectiveness is a measure of how well a ventilation system works in terms of delivering the supply air to the occupants of a building.
Ventilation efficiency is the term used to quantify ventilation effectiveness, being a measure of the ability of a ventilation system to exhaust the pollutants generated within a space.
Using displacement ventilation increases the ventilation effectiveness and, thus, improves the IAQ for a specific air change rate compared with mixing ventilation.
Specifications to receive LEED certification address over fifty requirements such as diverse issues as storm water management, the utilization of renewable energy, building reuse, construction waste management, low-emitting materials, and ventilation effectiveness.
The code is based on three assumptions: enough outside air is provided to dilute internally generated contaminated air, the outdoor air being used for ventilation is clean, and the supply of air to the room obtains 100 % mixing or ventilation effectiveness.
Initial research conducted by the HVRC, showed that displacement ventilation has the potential to reduce energy savings by up to 30 percent, while still maintaining ventilation effectiveness.
Building on previous research dealing with ventilation air distribution, this study added new elements of ventilation effectiveness research, accounting for source of outside air, particle contaminants, formaldehyde, and volatile organic compound (VOC) contaminants.
The ventilation effectiveness factor, based on the work of Zhang et al.
LEED awards 15 points in its Indoor Environmental Quality category for: ventilation effectiveness, temperature/humidity control, the use of low-emitting materials and optimization of views and day lighting.
The 47,000 square foot building is expected to earn LEED certification based on qualities such as energy-efficient HVAC & lighting fixtures including daylight & occupancy sensors, utilizing natural light through energy-efficient skylights & windows, high insulation values for the walls & roof, low-emitting materials, water-efficient plumbing fixtures, increased ventilation effectiveness, using FSC-certified finished woods, designating recycling & bike rack areas, and recycling building materials during construction.