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Just a side note of interest (with no judgment
inferred): ASHRAE/IESNA Standard 90.1-1999 no longer
allows lighting control credits. Compliance
is based on connected lighting power alone. With the 1989 Standard, credits could be
taken for automatic controls/sensors and daylighting controls. (Inference about the
dependability of lighting sensors/controls??? – I don’t
know.) Furthermore, VLT (Visible Light
Transmittance) is not considered in the Prescriptive Envelope Option, but it is
considered in the Envelope Trade-off Option, a la Chapter 5 (Sect. 5.3.2.4 and
5.4). Regards, =====================================
Larry O. Degelman,
P.E.
larry@xxxxxxxxxxxx Prof. Emeritus of
Architecture Ph./Fax: 1-979-696-2506 Texas A&M University ===================================== -----Original Message----- Can
day-lighting controls be considered for LEED certification under “Energy
& Atmosphere – Optimize Energy Performance”? If so where
should the light sensor be located in the space? Is there any energy code
that allows credit for day-lighting controls? The DOE2 program allows two light
sensors per space. Supposing the two sensors are located 5 ft and 10 ft
from the window. Is the average daylight at these two points used in
determining the reduction in artificial lighting? The DOE2
program expects zones to have 6 surfaces defined with X,Y,Z coordinates and
reflectance values for day-lighting analysis. Ignoring this produces
warning messages but the results show a reduction in artificial lighting
energy. For day-lighting analysis we only enter into DOE2 the X,Y
coordinates of the window origin relative to the wall and also the wall and
window dimensions. Can we assume that the energy savings results from the
DOE2 program are on the safe side (the actual energy saved is more) when we use
the program without all the surfaces and coordinates? Are there any
rules for day-lighting analysis for establishing energy savings and for
comparing the results from different studies? Varkie Thomas Skidmore,
Owings & Merrill LLP Tel: (312)
360-4467 (direct) ==================You received this e-mail because you are subscribed to the BLDG-SIM@xxxxxxxx mailing list. To unsubscribe from this mailing list send a blank message to BLDG-SIM-UNSUBSCRIBE@xxxxxxxx=====================================================You received this e-mail because you are subscribed to the BLDG-SIM@xxxxxxxx mailing list. To unsubscribe from this mailing list send a blank message to BLDG-SIM-UNSUBSCRIBE@xxxxxxxx |