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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Who should I contact at IECC for interpretation of the code? In
the meantime I have some questions (pardon my ignorance) regarding lighting.</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>IECC-2000, page 114, table 805.4.2 (also in the Chicago Building Code) shows
the following lighting power densities for office building:</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Entire</span></font> Building: 1.3
W/ft2</p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Tenant Area or Portion of Building: 1.5
W/ft2</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>There is a Note “b” associated with office (and also
classrooms/lecture halls) which states: </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>“Where lighting equipment is specified to be installed to meet
requirements of visual display terminals as the primary viewing task, <b><span
style='font-weight:bold'>the smaller of</span></b> the actual wattage of the
lighting equipment or 0.35 W/ft2 times area of space that the lighting
equipment is in shall be added to the interior lighting power determined in
accordance with this item”</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I assume that the entire building area is the gross area which includes
the core (elevator & duct shaft plan sections) and underground parking.
The net area is about 15% less than the gross area and this would be the tenant
area. 1.3 W/ft2 * 1.15 = 1.5 W/ft2</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Is the “lighting equipment” task lighting only, or does it
include other equipment such as projectors?</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Are computer monitors (visual display terminals) a “lighting
equipment” since it also generates light?</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>What is “<b><span style='font-weight:bold'>the smaller of</span></b>
the actual wattage of the lighting equipment or 0.35 W/ft2 times area of space
that the lighting equipment is in shall be added to the interior lighting power”?
Given a tenant space of 100 ft2 that has 1.0 W/ft2 general lighting and a 100
watt task light, what is the area lighting of the space for code compliance?</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Is there a lighting program or Excel spreadsheet program that will
calculate the W/ft2 at the ceiling given the illuminance required at the task
level, the type of lighting fixture or luminaire, and the ceiling height?
I think manufacturers should provide this calculator for their luminaires.</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>How would you show energy savings for occupancy based lighting
controls? In 10CFR435 Table 514.1 “Power Adjustment Factor (PAF)”,
the PAF for Occupancy Sensor is 0.3. When using energy analysis programs,
can we reduce the lighting schedule fractions by 30% for the proposed design compared
to the prototype or base design?</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Increasing the percent glass of the envelope and increasing the ceiling
height also reduces lighting usage because of increased daylighting. Daylight
can now reach deeper into the interior. How would you show this energy
savings using computer programs? Can the perimeter zone depth be increased
to say 30 feet? The DOE2.1E program lets you locate two light sensors in
the perimeter zones but the codes do not specify where in the zone. They could
both be located 5 feet from the window as representing the entire perimeter
zone depth.</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Varkie Thomas</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
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