1. Annalemma The figure 8 curve that represents the angular offset of the sun from its mean
position at as viewed from the earth
2. Balance Point The outdoor temperature at which a building makes the transition from a heating
Temperature to a cooling need
3. Daylight autono- The percentage of an area that meets a minimum daylight illuminance level or
my specified fraction of the operating hours per year. also referred to as special
daylight autonomy
4. Daylight factor The ratio expressed as a percentage othe indoor aluminates at a point on a
horizontal surface to the unobstructed Exterior horizontal illuminance
5. Effective apera- The product of visible transmittance and the window to wall ratio
ture
6. Equation of time The factor used to account for the difference between solar time and clock time.
Solar time is based on the position of the sun. It's basic unit is the solar day
7. Glazing factor A LEED based number calculated by taking into account window area, floor area,
a window geometry factor, light transmission, and a window height factor.
8. Ground light Visible light from the sun and sky, reflected by exterior surfaces below the plane
of the horizon
9. Light shelf A horizontal element position above eye level and designed to reflect daylight on
the ceiling for improved daylighting effectiveness
10. Net metering The requirement that a utility pay and charge equal rates regardless of which way
electricity flows as a part of the utility Grid.
11. Radiation spec- The entire range of electromagnetic radiation extending from 0 hz to 1023 hz. This
trum includes visible light as well as infrared radiation, radio waves, and gamma rays
among others
,12. Radiative cooling Passive or active design strategy that uses thermal mass to collect and store heat
during the day for release at night. Also known as nocturnal cooling and night
cooled mass
13. Shading coeffi- The ratio of the solar heat gain thru a glazing product to the solar heat gain
cient through an untreated 1/8 in clear double strength glass under the same set of
conditions. This is the value for the glass only, does not include the frame
14. Solar constant The amount of solar energy that falls in our unit time on her unit area that is
93,000,000 miles from the sun and orientated on a plane perpendicular to the
suns rays. The mean value of the solar constant is 433 btu/hr-ft
15. Solar heat gain The ratio of the solar heat gain thru a fenestration to the total solar radiation
coefficient incident on the glazing.
16. Solar time The time as defined by the sun and it's position relative to the earth. Because the
length of the solar day varies most reference the mean solar day as a basis for
timekeeping.
17. Solar savings The fraction of the total energy used by system that is provided by solar technol-
fraction ogy. Represented by the variable F, it is a decimal fraction from 0 to 1
18. Visible light The fraction of visible light that passes through a glazing material
transmittance
19. Window to wall The ratio of the net glazing area in your room or space to the gross exterior wall
ratio area
20. Work plane This assumed height at which work is performed usually considered to be at a
desk height, 30 inches above the floor
21. Co product
, A marketable byproduct from a process. Materials traditionally considered to be
waist but they can be repurposed as raw materials and a different manufacturing
process.
22. Demand control A system designed to adjust the amount of ventilation air provided to a space
ventilation based on the extent of occupancy. The system normally uses some type of sensors
23. Detention The temporary storage of storm run off and the detention facility to control Pete's
discharge rates and provides gravity settling of pollutants. Provides a gradual
release of stored water at a controlled rate
24. Drainage ease- The legal rights granted by a land owner to a grantee, commonly a governmental
ment entity, allowing the use of private land for Stormwater management
25. Embodied ener- The total energy required to extract produce fabricate and deliver material to
gy a job site including the collection of raw materials, the energy used to achieve
extract and process the wrong materials, transportation from the original site to
the processing plant, that energy required to turn the wrong materials into a finish
product, and energy required to transport the material to the job site
26. Fee in Lieu Payment of money by developer in place of meeting all or part of stormwater
performance standards
27. Hydraulic soil Soil, classification for run off potential A classification of soil based on their
group potential for a run off with the really wet.
28. Infiltration The process of percolating stormwater into the subsoil
29. Post consumer Referring to a material or product that has served its intended use it has been
diverted recovered from Waze destined for disposal, having completed its life as
a consumer item
30. Postindustrial Referring to materials generated in manufacturing processes, such as trimmings
or scrap, that have been recovered from solid waste