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CBE UFAD Design Tool

Input
Plenum Configuration
Interior Perimeter Unit Symbol
Room Height ft H
Floor Area ft2 Af
Floor Level - -
Diffuser Type
- -
Diffuser Length in -
In-floor Cooling Unit Capacity kBtu/hr Wunit
Number of Diffusers - n
Design Cooling load for Overhead System kBtu/hr WOH
Design Average Temperature in the Occupied Zone °F Toz,avg,d
Estimated Category 2 Leakage cfm/ft2 qleak,2
Setpoint Temperature of Air Entering the Supply Plenum °F Tplenum
Number of Occupants - m
Window Blinds - -
Zone Orientation - -
Exterior Wall Length ft Lp
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Results
Interior Perimeter Unit Symbol
Airflow (through diffusers) - - cfm Q
Airflow (through diffusers & leakage) - - cfm Qroom
Air Distribution Effectiveness - - - Ez
Diffuser Discharge Temperature - - °F TS
Air Temperature at 4 in. Height - - °F T4
Setpoint Thermostat Air Temperature (at 48 in.) - - °F Tset
Air Temperature at 67 in. Height - - °F T67
Return Air Temperature - - °F TR
Return Plenum Air Temperature - - °F TRP
Average Temperature in the OZ - - °F Toz,avg
Temperature difference between the head (67in) and ankle (4in) - - °F ΔToz
Airflow per area (through diffusers) - - cfm/ft2 Q
Airflow per diffuser - - cfm/diff. Q
Design airflow per area (through diffusers & leakage) - - cfm/ft2 Qroom
Design Cooling Load Calculated for a Overhead (mixing) System - - W WOH
UFAD Cooling Load Ratio (UCLR) - - - UCLR
Supply Plenum Fraction (SPF) - - - SPF
Zone Fraction (ZF) - - - ZF
Return Plenum Fraction (RPF) - - - RPF
UFAD Cooling Load - - W W
UFAD Cooling Load per Area - - W/ft2 W
Supply Plenum Cooling Load - - W -
Supply Plenum Cooling Load per Area - - W/ft2 -
Zone Cooling Load - - W -
Zone Cooling Load per Area - - W/ft2 -
Return Plenum Cooling Load - - W -
Return Plenum Cooling Load per Area - - W/ft2 -
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Created for Opera, Firefox, and Chrome (Internet Explorer not supported).
Algorithm developed by Stefano Schiavon, Kwang Ho Lee, Fred Bauman, and Tom Webster (2010).
Implementation and web interface by Tyler Hoyt, Bin Chen and Federico Tartarini. More information about the tool.
source code repository

Source code

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