BEDES Dictionary

Version 2.6

You can explore the BEDES dictionary in several ways: use the search box to search for a particular term; filter the list of terms by category using the checkboxes below; click on each term for more details. You can also download all the terms and list options in CSV or XML format using the buttons below.

All Terms:
All List Options:
Filter By Category
Global Terms
Termsort ascending Term Definition Lists Unit of Measure

Dimension of the thickness of a component. Can be used to define overhang thickness, in addition to overhang depth and width.

Thermal Zone Layout

Type of zoning used for space conditioning

View None
Thermal Conductivity

A measure of a material's ability to conduct heat, defined as the amount of heat transferred per unit time, given a unit area of the material and a unit temperature gradient through the thickness of the material.

Thermal Conductance

A measure of a material's ability to conduct heat, defined as the heat flux through the material induced by a unit temperature difference between the surfaces of the material.

Thermal Absorptance

The fraction of incident long wavelength infrared radiation that is absorbed by the material or surface. For opaque materials the thermal absorptance value will equal the value of thermal emittance. Value range: 0-1

Surface Roughness

A description of the roughness of the exposed surface of a material. This property is used to approximate the effect of the surface condition on the convection of air across the surface. In energy simulation models, it is used to help determine the convection coefficients for a surface.

View None
Specific Heat

Ratio of the quantity of heat required to raise the temperature of a given mass of any substance one degree to the quantity required to raise the temperature of an equal mass of a standard substance one degree (usually water at 59¡F (15¡C)


Dimension of the distance between two components. Examples include: Framing spacin--the dimension from centerline to centerline of a surface framing material; Window spacing--the dimension between windows in a discrete window layout.

Solar Absorptance

The fraction of incident radiation in the solar spectrum that is absorbed by the material or surface. Value range: 0-1

Serial Number

A unique code assigned for identification of a single unit.

Sector Classification

The sector classification appropriate for the premises. Also, the sector-appropriate sizing for equipment.

View None
Ratio of Melanopic to Standard Illuminance (M/P ratio)

M/P ratio - The melanopic ratio is the ratio of the melanopic response (of the cells in the eye that help control the circadian rhythms) to the visual response

Rated Lifetime

Rated life time of operation in number of years.

R Value Per Unit Dimension

The R-value of a material, per inch of thickness.

R Value

The R-value, also known as thermal insulance, is the temperature difference per unit heat flux, at steady state, between two defined surfaces of a material or construction that induces one unit of heat flux between the surfaces. The R-value is used for comparing insulating values of different materials, for the specific thickness of the material. The higher the R-value, the greater a material's insulating properties and the slower heat flows through it. The R-value does not include the interior and exterior air film coefficients. The R-value is the reciprocal of the U-factor.

Quantity Of Units Per System

Number of units in each system. For instance, a photovoltaic system will have a number of modules per array. In an office, there might be a number of displays per workstation.

Quantity Intensity

The number of entities per unit area. This can be used to represent load densities (e.g., People/ft2, Watts/ft2)


The number of specified units


Order of priority, for example: configuration of equipment, or priority of contact information.

View None
Preferred Contact View None

Length of a line forming the boundary around the premises

Percentage Of Total Installed Capacity

Percentage of maximum, peak or rated installed capacity of a system, piece, or set of equipment that is either available or being used.

Percentage Of Total Floor Area Served

Portion of the total floor area within a defined zone that is being served by a system, piece, or set of equipment.

Percentage Of Total Area

Percent of a component to the total area of another component. This can be used to characterize the percentage of Conditioned Floor Area to Gross Floor Area, for example.

Output Resource Type

Resource or fuel produced by the system and used as energy on the premises. See Resource type for complete list of resources.

View None