LEED Frequently Used Terms & Definitions

AFV
Alternative-Fueled Vehicle: e.g., hybrid-electric, electric, natural-gas, bio-diesel, and fuel-cell
BAS
Building Automation System: a network of electronic devices that control mechanical and lighting systems
BIPV
Building Integrated Photovoltaics: e.g., integrated with roof, spandrels, glazing, or shading devices
BMP
Best Management Practice
BOD
Basis of Design: design information necessary to accomplish the owner’s project requirements
CBECS
Commercial Buildings Energy Consumption Survey: DOE database logging actual building energy use figures
CDVR
Corrected Design Ventilation Rate: design ventilation rate divided by the air-change effectiveness
CFCs
Chlorofluorocarbons: ozone-depleting constituent of the most widely used HV AC refrigerants
COC
Chain-of-Custody: proper accounting of materials flows, as used by the FSC
CxA
Commissioning Authority: an independent representative who guides the commissioning process
DCV
Demand Controlled Ventilation: outdoor airflow rate is determined by CO2 monitors within occupied spaces
ECM
Energy Conservation Measure: tracked in support of measurement and verification
ESC
Erosion and Sedimentation Control Plan
ETS
Environmental Tobacco Smoke, incl. that transported between spaces by ventilation systems
FTE
Full-Time Equivalent: a method of measuring total occupant hours in a building
GF
Glazing Factor: the percentage ratio of exterior illumination to interior illumination
GHGs
Greenhouse gases, such as carbon dioxide
GWP
Global Warming Potential: rating of a gaseous substance’s contribution to greenhouse effects
HCFCs
Hydrochlorofluorocarbons: alternative refrigerant type that has reduced ozone-depleting effects
HFCs
Hydrofluorocarbons: alternative refrigerant with no ozone-depleting effects but some trade-offs
HVAC
Heating, Ventilation, Air-Conditioning, and Refrigeration
IAQ
Indoor Air Quality with respect to human occupancy of a building
IEQ
Indoor Environmental Quality: includes IAQ, thermal comfort, daylighting, acoustics etc.
IPLV
Integrated Part Load Value: chiller efficiency including part-load operation for a given duty cycle
LCA
Life-Cycle Assessment: a full accounting of a material’s “cradle-to-grave” environmental impacts
LZ
Lighting Zone: ASHRAE/IESNA divisions (4) that determine the amount of light appropriate to a land use
MERV
Minimum Efficiency Reporting Value: a measure of the effectiveness of air filtration media
MSDS
Material Safety Data Sheet: provides essential information on composition, hazards, & precautions
M&V
Measurement & Verification: the process of monitoring building systems to ensure optimal performance
ODP
Ozone Depleting Potential: rating of a gaseous substance’s ability to destroy stratospheric ozone
OPR
Owner’s Project Requirements: the functional requirements of a project and the expectations of use and operations
PRM
Performance Rating Method: requires development of an energy model for the proposed building design
REC
Renewable Energy Certificate: purchased as offsets when alternative energy (e.g., wind) cannot be directly used
SHGC
Solar Heat Gain Coefficient: the fraction of solar radiation admitted though a particular glazing
SRI
Solar Reflectance Index: the measure of a material’s ability to reject solar heat, demonstrated by a temperature rise
TSS
Total Suspended Solids: particles too small or light to be removed from a liquid via gravity settling
TP
Total Phosphorous: phosphates, polyphosphates, and orthophosphates in stormwater
TWA
Total Water Applied: the total amount of water used for irrigation, including potable and non-potable
VAV
Variable Air Volume: ventilation system configuration differentiated from Constant Air Volume
VOCs
Volatile Organic Compounds: potentially hazardous substances that offgas from certain materials
ZEV
Zero Emission Vehicles: a California Air Resources Board designation for alternative-fuel vehicles

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