ASHRAE Journal - February 2014 - 29
a single exhaust grille results in
FIGURE 1 Poor restroom exhaust and makeup system design.
almost exactly the same airflow patterns down at the toilet level.
Note that it is the makeup air
that provides the dilution of odors;
the fact that air is also exhausted,
as opposed to returned or simply
exfiltrated to adjacent spaces, has
no effect on odor concentration in
the restroom. It simply prevents the
odors from being recirculated to
FIGURE 2 Better restroom exhaust and makeup system design.
other spaces in the building.
Providing multiple exhaust grilles
also leads to higher balancing costs,
not just for the labor to balance the
outlets, but also because of the added
costs of balancing damper remote
control devices required by the inaccessible drywall ceilings used in most
restrooms. A trick to eliminate the
need for damper remote controls is:
* Use a lay-in (tee-bar) style grille
frame rather than a drywall (surface
FIGURE 3 CFD analysis of exhaust grille; velocity vectors (courtesy of Price Industries).
mounted) frame;
* Install the grille into a so-called
"plaster frame" (Figure 4), which is a
frame that is mounted in the drywall
ceiling and accepts a lay-in style grille;
* Connect the grille to the duct
main using a flexible duct and locate
the balancing damper within a few
feet of the grille (Figure 2); and
* The grille can be balanced by
popping it up above the frame
(made possible by the flexible duct),
reaching in to adjust the damper, replacing the grille
meet ASHRAE Standard 90.12 prescriptive limitations
into the frame, then measuring airflow, and iterating if
against excessive reheat. The building's hot water heatneeded until the desired airflow is achieved.
ing system would also have to operate even in warm
weather to prevent overcooling.
Makeup Air
Alternative means of providing makeup air that are
In Figure 1, makeup air is supplied by a constant volboth less expensive and more energy efficient include
ume reheat box. The exhaust rate is much higher than
the following, listed from lowest to highest first cost:
the cooling load in the space so a reheat coil is required
1. Door undercut or door louver (Figure 2). This option
to prevent the space from being overcooled. This is an
is applicable only if the restroom door is not rated and
expensive and inefficient design and, in fact, does not
will only perform well if restroom lighting loads are low.
** This behavior is described in the old expression, "You cannot suck out a match," or at least not without burning your lips.
FEBRUARY 2014
ashrae.org
ashraE JourNal
29
ASHRAE Journal - February 2014
Table of Contents for the Digital Edition of ASHRAE Journal - February 2014
ASHRAE Journal - February 2014
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Understanding Salaries in the A/E Industry
Improving Operating Room Contamination Control
Standing Columns
Engineer's Notebook
Saving Energy with Cooling Towers
Building Sciences
ACREX India 2014 Show Guide
HVAC Applications
Technical vs. Process Commissioning: Design Phase Commissioning
Data Centers
IAQ Applications
Energy Modeling
InfoCenter
Refrigeration Applications
Products
Classified Advertising
Advertisers Index
ASHRAE Journal - February 2014 - ASHRAE Journal - February 2014
ASHRAE Journal - February 2014 - Cover2
ASHRAE Journal - February 2014 - 1
ASHRAE Journal - February 2014 - 2
ASHRAE Journal - February 2014 - Contents
ASHRAE Journal - February 2014 - Commentary
ASHRAE Journal - February 2014 - 5
ASHRAE Journal - February 2014 - Industry News
ASHRAE Journal - February 2014 - 7
ASHRAE Journal - February 2014 - 8
ASHRAE Journal - February 2014 - Letters
ASHRAE Journal - February 2014 - Meetings and Shows
ASHRAE Journal - February 2014 - 11
ASHRAE Journal - February 2014 - Understanding Salaries in the A/E Industry
ASHRAE Journal - February 2014 - 13
ASHRAE Journal - February 2014 - 14
ASHRAE Journal - February 2014 - 15
ASHRAE Journal - February 2014 - 16
ASHRAE Journal - February 2014 - 17
ASHRAE Journal - February 2014 - Improving Operating Room Contamination Control
ASHRAE Journal - February 2014 - 19
ASHRAE Journal - February 2014 - 20
ASHRAE Journal - February 2014 - 21
ASHRAE Journal - February 2014 - 22
ASHRAE Journal - February 2014 - 23
ASHRAE Journal - February 2014 - 24
ASHRAE Journal - February 2014 - 25
ASHRAE Journal - February 2014 - 26
ASHRAE Journal - February 2014 - 27
ASHRAE Journal - February 2014 - Engineer's Notebook
ASHRAE Journal - February 2014 - 29
ASHRAE Journal - February 2014 - 30
ASHRAE Journal - February 2014 - 31
ASHRAE Journal - February 2014 - 32
ASHRAE Journal - February 2014 - 33
ASHRAE Journal - February 2014 - Saving Energy with Cooling Towers
ASHRAE Journal - February 2014 - 35
ASHRAE Journal - February 2014 - 36
ASHRAE Journal - February 2014 - 37
ASHRAE Journal - February 2014 - 38
ASHRAE Journal - February 2014 - 39
ASHRAE Journal - February 2014 - 40
ASHRAE Journal - February 2014 - 41
ASHRAE Journal - February 2014 - Building Sciences
ASHRAE Journal - February 2014 - 43
ASHRAE Journal - February 2014 - 44
ASHRAE Journal - February 2014 - 45
ASHRAE Journal - February 2014 - 46
ASHRAE Journal - February 2014 - 47
ASHRAE Journal - February 2014 - 48
ASHRAE Journal - February 2014 - ACREX India 2014 Show Guide
ASHRAE Journal - February 2014 - SCover2
ASHRAE Journal - February 2014 - S1
ASHRAE Journal - February 2014 - S2
ASHRAE Journal - February 2014 - S3
ASHRAE Journal - February 2014 - S4
ASHRAE Journal - February 2014 - S5
ASHRAE Journal - February 2014 - S6
ASHRAE Journal - February 2014 - S7
ASHRAE Journal - February 2014 - S8
ASHRAE Journal - February 2014 - S9
ASHRAE Journal - February 2014 - S10
ASHRAE Journal - February 2014 - S11
ASHRAE Journal - February 2014 - S12
ASHRAE Journal - February 2014 - S13
ASHRAE Journal - February 2014 - S14
ASHRAE Journal - February 2014 - S15
ASHRAE Journal - February 2014 - S16
ASHRAE Journal - February 2014 - S17
ASHRAE Journal - February 2014 - S18
ASHRAE Journal - February 2014 - S19
ASHRAE Journal - February 2014 - S20
ASHRAE Journal - February 2014 - S21
ASHRAE Journal - February 2014 - SCover4
ASHRAE Journal - February 2014 - HVAC Applications
ASHRAE Journal - February 2014 - 50
ASHRAE Journal - February 2014 - 51
ASHRAE Journal - February 2014 - Technical vs. Process Commissioning: Design Phase Commissioning
ASHRAE Journal - February 2014 - 53
ASHRAE Journal - February 2014 - 54
ASHRAE Journal - February 2014 - 55
ASHRAE Journal - February 2014 - 56
ASHRAE Journal - February 2014 - 57
ASHRAE Journal - February 2014 - Data Centers
ASHRAE Journal - February 2014 - 59
ASHRAE Journal - February 2014 - 60
ASHRAE Journal - February 2014 - 61
ASHRAE Journal - February 2014 - IAQ Applications
ASHRAE Journal - February 2014 - 63
ASHRAE Journal - February 2014 - 64
ASHRAE Journal - February 2014 - 65
ASHRAE Journal - February 2014 - 66
ASHRAE Journal - February 2014 - 67
ASHRAE Journal - February 2014 - Energy Modeling
ASHRAE Journal - February 2014 - 69
ASHRAE Journal - February 2014 - InfoCenter
ASHRAE Journal - February 2014 - 71
ASHRAE Journal - February 2014 - 72
ASHRAE Journal - February 2014 - 73
ASHRAE Journal - February 2014 - Refrigeration Applications
ASHRAE Journal - February 2014 - 75
ASHRAE Journal - February 2014 - Products
ASHRAE Journal - February 2014 - 77
ASHRAE Journal - February 2014 - 78
ASHRAE Journal - February 2014 - Classified Advertising
ASHRAE Journal - February 2014 - Advertisers Index
ASHRAE Journal - February 2014 - Cover3
ASHRAE Journal - February 2014 - Cover4
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