Catalogue

UV-PRC003-EN 11
Application Considerations
conditions. If this program has not been made available, ask a local Trane account manager to
supply the desired selections or provide a copy of the program.
The Importance of Air Quality
Indoor air quality (IAQ) should be considered a top priority in the school environment. School
institutes contain a diverse day of activities that have a potential for air impurity sources including
cafeterias, art and science classrooms, vocational education areas, pools and locker rooms. Proper
ventilation and filtration of these spaces can pose some challenges.
Occupant density in classrooms is much higher than that found in office or retail spaces. The
amount of outdoor air required to ventilate a classroom is based predominantly on the number of
students expected to occupy the space. Students also move in large groups, frequently throughout
the building, resulting in widely varied thermal loads within the zones. To compound the situation,
a classroom mechanical system is typically run for 9 months of the year, and vacated for 3 months
(either by turning up or off the HVAC system). To increase the IAQ challenge even more, building
construction techniques that help reduce energy costs, also tightly seal the school. This can lead
to uncirculated/unfiltered air.
Ventilation
Ventilation is an important factor in the maintenance of healthy air. In a poor ventilated school
building, fumes and vapors are not properly exhausted allowing particles to develop. A healthier
building is a building where the air is exchanged more frequently and properly filtered. Through
ventilation, stale indoor air is exhausted and fresh treated outdoor air is drawn into the building.
The amount of ventilation air required is established by building codes and industry standards.
Most building codes reference ASHRAE Standard 62
–Ventilation for Acceptable Indoor Air
Quality–as the minimum requirement for ventilation system design. Architects, engineers and
contractors utilize this standard when determining and calculating the type of load the building
environment will place on the mechanical system.
Trane Unit Ventilators Support Indoor Air Quality
The Trane unit ventilator is tested and designed to exceed ASHRAE Standard 62. This includes the
use of a higher efficiency filtration to help introduce proper levels of “fresh” diluted air for
contaminant removal.
Figure 7. System choice for the classroom unit ventilator
AND/OR
AND/OR
CHILLER FOR
COOLING
BOILER
FOR HEAT ADD
CONDENSER
FOR COOLING
CLASSROOM UNIT VENTILATOR
Indoor Air Quality
UV-PRC003-EN.book Page 11 Tuesday, June 4, 2013 8:59 PM