ES Glossary
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
BAS
Building Automation System
BHP
Boiler Horsepower; also, Brake Horsepower
BMS
Building Management System
CAD
Computer-Aided Design
CFM
Cubic Feet per Minute
CHW
Chilled Water
CMMS
Computerized Maintenance Management System
CO2
Carbon Dioxide
COP
Coefficient Of Performance
D-B
Design-Build
DB
Drybulb
DDC
Direct Digital Controls
DOAS
Dedicated Outdoor Air System
DOE
U.S. Department of Energy
DX
Direct Expansion
EMS
Energy Management System
EPA
U.S. Environmental Protection Agency
FPM
Feet Per Minute
GPM
Gallons Per Minute
HEPA
High-Efficiency Particulate Air
HTML
Hypertext Markup Language
HTTP
Hypertext Transfer Protocol
HWR
Hot Water Return
HWS
Hot Water Supply
IAQ
Indoor Air Quality
IS
Information Systems
IT
Information Technology
LEED
Leadership in Energy and Environmental Design, a designation by the U.S. Green Building Council
MEC
Mechanical, Electrical, Communication
MEP
Mechanical, Electrical, Plumbing
O&M
Operations and Maintenance
OA
Outside Air
OEM
Original Equipment Manufacturer
PID
Proportional, Integral, Derivative
PM
Preventive Maintenance
PPM
Parts Per Million
RFP
Request For Proposal
RFS
Request For Submittal
RH
Relative Humidity
RO
Reverse Osmosis
ROI
Return On Investment
RTD
Resistance Temperature Detector
SCFM
Standard Cubic Feet per Minute
TAB
Testing And Balancing
TES
Thermal Energy Storage
U
Underwriter's Laboratory
UV
Ultraviolet
VAV
Variable-Air Volume
VFD
Variable-Frequency Drive
VSD
Variable-Speed Drive
X
Extensible Markup Language
W
Wide Area Network
WB
Wetbulb
WC
Water Column
WG
Water Gauge