Glossary

A
A/C – Air Conditioning
ACH – Air Changes Per Hour
AE – Architectural and Engineering; or Architect and Engineer
AFD – Adjustable-Frequency Drive
AHU – Air-Handling Unit
ASD – Adjustable-Speed Drive
ASHRAE – American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc.
ATC – Automatic Temperature Control

B
BAS – Building Automation System
BHP – Boiler Horsepower; also, Brake Horsepower
BMS – Building Management System

C
CAD – Computer-Aided Design
CBAS – Computrols Building Automation System
CFM – Cubic Feet per Minute
CHW – Chilled Water
CMMS – Computerized Maintenance Management System
CO2 – Carbon Dioxide
COP – Coefficient Of Performance

D
D-B – Design-Build
DB – Drybulb
DDC – Direct Digital Controls
DOAS – Dedicated Outdoor Air System
DOE – U.S. Department of Energy
DX – Direct Expansion

E
EMS – Energy Management System
EPA – U.S. Environmental Protection Agency

F
FPM – Feet Per Minute

G
GPM – Gallons Per Minute

H
HEPA – High-Efficiency Particulate Air
HTML – Hypertext Markup Language
HTTP – Hypertext Transfer Protocol
HWR – Hot Water Return
HWS – Hot Water Supply

I
IAQ – Indoor Air Quality
IS – Information Systems
IT – Information Technology

L
LEED™ – Leadership in Energy and Environmental Design, a designation by the U.S. Green Building Council

M
MEC – Mechanical, Electrical, Communication
MEP – Mechanical, Electrical, Plumbing

O
O&M – Operations and Maintenance
OA – Outside Air
OEM – Original Equipment Manufacturer

P
PID – Proportional, Integral, Derivative
PM – Preventive Maintenance
PPM – Parts Per Million

R
RFP – Request For Proposal
RFS – Request For Submittal
RH – Relative Humidity
RO – Reverse Osmosis
ROI – Return On Investment
RTD – Resistance Temperature Detector

S
SCFM – Standard Cubic Feet per Minute

T
TAB – Testing And Balancing
TES – Thermal Energy Storage

U
UL – Underwriter’s Laboratory
UV – Ultraviolet

V
VAV – Variable-Air Volume
VFD – Variable-Frequency Drive
VSD – Variable-Speed Drive

X
XML – Extensible Markup Language

W
WAN – Wide Area Network
WB – Wetbulb
WC – Water Column
WG – Water Gauge