ASHRAE Journal - March 2014 - 84

Column HVAC AppliCAtions

Standard 62.1 identifies three minimum ventilation
rates. "Off" is when the space is unoccupied. This may
mean a room is locked, but some school districts consider a classroom that not scheduled for class to be considered "off." The second state is "unoccupied," which
typically requires 0.05 cfm/ft2 (2.54 L/s·m2) ventilation
to take care of carpeting and other sources of potential
VOCs. "Occupied" means that both the minimum space
ventilation and the minimum occupant ventilation are
to be maintained.
The consequence of this is that many types of spaces
will have a dynamic ventilation rate, implying a
moveable damper on the ventilation supply duct to
the zone. With a VAV system, of course, this is a part of
the design. For other systems, such as a water source
heat pump, fan coil, variable refrigerant flow, or even
chilled beams, engineers will need to consider how
to accomplish this. Placing a moveable damper on
the ventilation supply, allows one to manage economizer operation. Of course, pressure independent
flow management (using a flow measurement technique) will be required if one is to maintain true flow
rate control. Again, this is already a part of any VAV
system.

Fan-powered VAV boxes, which have been in use for
many years, have never been properly accounted for in
energy models. ASHRAE and AHRI conducted a joint
research program to determine whole system energy
response for both series and parallel fan boxes as well as
standard and electrically commutated motors (ECM). The
output of this study has been made available to ASHRAE;
AHRI is sponsoring a research project to incorporate these
models into the energy calculation programs to better
predict energy savings of different strategies.
With a proper combination of diffuser selection and
variable volume series-flow fan boxes (which make ECM
motors accurate, efficient, and practical), it promises to
be an extremely efficient system. When combined with
sensible cooling coils on the fan boxes (usually on the
induction inlet to minimize pressure loss), one may consider eliminating the conventional air handler altogether
and relying on the dedicated outdoor air system (DOAS)
unit for economizer, ventilation, and humidity control.
Stay tuned as the Energy Efficient Air Systems MTG
develops research projects and design recommendations with the goal of making VAV systems truly energy
efficient, meeting ventilation standards, and providing
occupant comfort.

www.info.hotims.com/49802-31
84

ASHRAE JouRnAl

ashrae.org

March 2014



ASHRAE Journal - March 2014

Table of Contents for the Digital Edition of ASHRAE Journal - March 2014

ASHRAE Journal - March 2014
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
2014 ASHRAE Technology Awards
Cold Weather Operation of Cooling Towers
Improving Operating Efficiency of Packaged Air Conditioners & Heat Pumps
Aligning IECC and Standard 90.1
Small Building, Vast Potential
Standing Columns
Building Sciences
Engineer's Notebook
Refrigeration Applications
Data Centers
HVAC Applications
Energy Modeling
People
Special Products
Classified Advertising
Advertisers Index
ASHRAE Journal - March 2014 - Intro
ASHRAE Journal - March 2014 - ASHRAE Journal - March 2014
ASHRAE Journal - March 2014 - Cover2
ASHRAE Journal - March 2014 - 1
ASHRAE Journal - March 2014 - 2
ASHRAE Journal - March 2014 - Contents
ASHRAE Journal - March 2014 - Commentary
ASHRAE Journal - March 2014 - 5
ASHRAE Journal - March 2014 - Industry News
ASHRAE Journal - March 2014 - 7
ASHRAE Journal - March 2014 - 8
ASHRAE Journal - March 2014 - 9
ASHRAE Journal - March 2014 - 10
ASHRAE Journal - March 2014 - 11
ASHRAE Journal - March 2014 - 12
ASHRAE Journal - March 2014 - 13
ASHRAE Journal - March 2014 - 14
ASHRAE Journal - March 2014 - 15
ASHRAE Journal - March 2014 - Letters
ASHRAE Journal - March 2014 - 17
ASHRAE Journal - March 2014 - Meetings and Shows
ASHRAE Journal - March 2014 - 19
ASHRAE Journal - March 2014 - 2014 ASHRAE Technology Awards
ASHRAE Journal - March 2014 - 21
ASHRAE Journal - March 2014 - 22
ASHRAE Journal - March 2014 - 23
ASHRAE Journal - March 2014 - 24
ASHRAE Journal - March 2014 - 25
ASHRAE Journal - March 2014 - Cold Weather Operation of Cooling Towers
ASHRAE Journal - March 2014 - 27
ASHRAE Journal - March 2014 - 28
ASHRAE Journal - March 2014 - 29
ASHRAE Journal - March 2014 - 30
ASHRAE Journal - March 2014 - 31
ASHRAE Journal - March 2014 - 32
ASHRAE Journal - March 2014 - 33
ASHRAE Journal - March 2014 - 34
ASHRAE Journal - March 2014 - 35
ASHRAE Journal - March 2014 - Improving Operating Efficiency of Packaged Air Conditioners & Heat Pumps
ASHRAE Journal - March 2014 - 37
ASHRAE Journal - March 2014 - 38
ASHRAE Journal - March 2014 - 39
ASHRAE Journal - March 2014 - 40
ASHRAE Journal - March 2014 - 41
ASHRAE Journal - March 2014 - 42
ASHRAE Journal - March 2014 - 43
ASHRAE Journal - March 2014 - Building Sciences
ASHRAE Journal - March 2014 - 45
ASHRAE Journal - March 2014 - 46
ASHRAE Journal - March 2014 - 47
ASHRAE Journal - March 2014 - 48
ASHRAE Journal - March 2014 - 49
ASHRAE Journal - March 2014 - Engineer's Notebook
ASHRAE Journal - March 2014 - 51
ASHRAE Journal - March 2014 - 52
ASHRAE Journal - March 2014 - 53
ASHRAE Journal - March 2014 - 54
ASHRAE Journal - March 2014 - 55
ASHRAE Journal - March 2014 - Aligning IECC and Standard 90.1
ASHRAE Journal - March 2014 - 57
ASHRAE Journal - March 2014 - 58
ASHRAE Journal - March 2014 - 59
ASHRAE Journal - March 2014 - 60
ASHRAE Journal - March 2014 - 61
ASHRAE Journal - March 2014 - Refrigeration Applications
ASHRAE Journal - March 2014 - 63
ASHRAE Journal - March 2014 - Small Building, Vast Potential
ASHRAE Journal - March 2014 - 65
ASHRAE Journal - March 2014 - 66
ASHRAE Journal - March 2014 - 67
ASHRAE Journal - March 2014 - 68
ASHRAE Journal - March 2014 - 69
ASHRAE Journal - March 2014 - 70
ASHRAE Journal - March 2014 - 71
ASHRAE Journal - March 2014 - 72
ASHRAE Journal - March 2014 - 73
ASHRAE Journal - March 2014 - Data Centers
ASHRAE Journal - March 2014 - 75
ASHRAE Journal - March 2014 - 76
ASHRAE Journal - March 2014 - 77
ASHRAE Journal - March 2014 - 78
ASHRAE Journal - March 2014 - 79
ASHRAE Journal - March 2014 - 80
ASHRAE Journal - March 2014 - 81
ASHRAE Journal - March 2014 - HVAC Applications
ASHRAE Journal - March 2014 - 83
ASHRAE Journal - March 2014 - 84
ASHRAE Journal - March 2014 - 85
ASHRAE Journal - March 2014 - 86
ASHRAE Journal - March 2014 - 87
ASHRAE Journal - March 2014 - 88
ASHRAE Journal - March 2014 - 89
ASHRAE Journal - March 2014 - 90
ASHRAE Journal - March 2014 - 91
ASHRAE Journal - March 2014 - 92
ASHRAE Journal - March 2014 - 93
ASHRAE Journal - March 2014 - 94
ASHRAE Journal - March 2014 - 95
ASHRAE Journal - March 2014 - Energy Modeling
ASHRAE Journal - March 2014 - People
ASHRAE Journal - March 2014 - Special Products
ASHRAE Journal - March 2014 - 99
ASHRAE Journal - March 2014 - 100
ASHRAE Journal - March 2014 - 101
ASHRAE Journal - March 2014 - Classified Advertising
ASHRAE Journal - March 2014 - 103
ASHRAE Journal - March 2014 - Advertisers Index
ASHRAE Journal - March 2014 - Cover3
ASHRAE Journal - March 2014 - Cover4
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