ASHRAE Journal - January 2021 - 61

COLUMN IEQ APPLICATIONS

FaTIMA uses the equation solver of the CONTAM proFIGURE 1 Schematic of single-zone model.
gram, which has been used for decades for multizone,
Qoa
whole-building airflow and contaminant transport analyQrec
sis. Details regarding CONTAM's underlying theory and
capabilities are provided in the CONTAM user guide.3
Qexh
While CONTAM provides a generalized modeling tool
that allows users to address a broad range of problems
G
Qr
Qs
related to contaminant transport within the built environQac
Qinf
ment, FaTIMA targets a specific class of problems related
Vd
Qlx
to bioaerosols using a simplified building representation.
The FaTIMA documentation provides information  help
Surfaces (Floor, Walls, Ceiling, Other)
users select inputs based on published
information, but these input values are FIGURE 2 FaTIMA web interface (input section).
not meant to be recommendations for
applying the tool.
The web interface of FaTIMA is
divided into two sections: inputs
and results, as shown in Figure 2 and
Figure 3, respectively. The inputs
are subdivided into zone geometry,
infiltration, ventilation system,
system filters, calculated airflows,
room air cleaner, particle properties,
continuous source, burst source,
particle deposition velocities, iniFIGURE 3 FaTIMA web interface (results section) shows numerical values (top); time histories of airborne concentration, exposure and surface loadings (middle); and summary pie charts (bottom).
tial concentrations, and occupant
exposure.

Inputs
Inputs to FaTIMA (Figure 2) are
described briefly here; more details
are in the user guide (https://doi.
org/10.6028/NIST.TN.2095).
Zone Geometry. Inputs include
zone volume and floor, wall, ceiling and other surface areas to
account for removal of airborne
particles by deposition to these
surfaces.
Infiltration. Air leakage through
unintentional openings in the
exterior envelope of a building is
driven by wind, indoor-outdoor
temperature difference and equipment operation. While
CONTAM calculates infiltration from mass balance principles, FaTIMA uses a constant infiltration airflow rate Q inf
entered by the user. Although commercial buildings are

often assumed to have no infiltration when HVAC systems
are operating, studies have long shown that infiltration in
commercial buildings can be of the same order of magnitude as system outdoor air intake rates.4 - 6
JAN UARY 2021

ashrae.org

ASHRAE JOURNAL

61


https://doi.org/10.6028/NIST.TN.2095 https://doi.org/10.6028/NIST.TN.2095 http://www.ashrae.org

ASHRAE Journal - January 2021

Table of Contents for the Digital Edition of ASHRAE Journal - January 2021

Contents
ASHRAE Journal - January 2021 - Intro
ASHRAE Journal - January 2021 - Cover1
ASHRAE Journal - January 2021 - Cover2
ASHRAE Journal - January 2021 - 1
ASHRAE Journal - January 2021 - 1a
ASHRAE Journal - January 2021 - 1b
ASHRAE Journal - January 2021 - Contents
ASHRAE Journal - January 2021 - 3
ASHRAE Journal - January 2021 - 4
ASHRAE Journal - January 2021 - 5
ASHRAE Journal - January 2021 - 6
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ASHRAE Journal - January 2021 - Cover3
ASHRAE Journal - January 2021 - Cover4
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