Catalogue

UV-PRC004-EN 17
Selection Procedures
Example:
Given: Air circulation specified = 8 air changes per hour
Classroom size = 35 ft long x 25 ft wide x 10 ft high
Inside design air temperature = 75°F
Ventilation cooling required at 58°F = 29,000 BTU
CFM required = [8 changes/hr x (35 x 25 x 10) ft
3
] / (60 minutes/hr) = 1170 cfm
Checking ventilation cooling capacity:
29,800 BTU = 1.085 x CFM x (80-58)
CFM = 1250
This indicates that a 1250 cfm unit would have satisfactory ventilation cooling capacity at the
design changeover point of 58°F. Coil capacity will become confirmed when the coil is selected.
Coil Selection
Selecting the correct coil is done through Trane’s Official Product Selection System (TOPSS).
For your convenience, TOPSS has a mixed air calculator built into the program.
UV-PRC004-EN.book Page 17 Monday, February 4, 2013 11:01 AM