Page 315 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

LEED Indoor Envir onmental Quality 277

For occupancies where shift employees share the same workstations as other shift
employees depending on the time, and for uses where there is really only one main
“shift,” providing individual controls at locations equal to 90 percent of FTE should
adequately meet the intent of the requirement. If there are alternative regular uses,
where many occupants in separate shifts have different workstation locations, then the
definition of the required number of individual lighting controls will need to be
analyzed and validated differently. However, for most commercial and institutional
uses, the minimum number of individual lighting control locations (ILCLs) can be
calculated as

ILCL ≥ 0.9 × FTE (6.6.1)

Group Control The second part of this credit is to make sure that there are lighting
controls in group spaces, such as conference rooms and classrooms, so that the groups
gathered in these areas have greater control over the lighting as appropriate for their
group needs. If some of the lighting comes from daylighting, then glare control and
room-darkening shades or features should be available too.

Special Circumstances and Exemplary Performance
The individual lighting loads resulting from implementation of the requirements of this
credit should be included in the energy calculations as performed in the Energy and
Atmosphere category. In many cases there will be a resultant decrease in overall lighting
load, as some areas might not need the maximum lighting during all times, but only
when the individual prefers the higher lighting intensities. Since individual control
may also result in a decrease in energy efficiency if the controls are left on during
unoccupied times, education into energy conservation should be a part of this credit.
An example might be posted notices to please turn off the individually controlled lights
when exiting the area, or automatic sensors that detect when the room is unoccupied.
There is no EP point for this credit in both versions 2.2 and 2009.

IEQ Credit 6.2: Controllability of Systems—Thermal Comfort
This credit allows for increased occupant control over the thermal environment where
one works or performs regular tasks. Thermal comfort is based on many environmental
factors and personal factors. Four common environmental factors are air temperature,
radiant temperature, humidity, and airspeed, with air temperature being the
predominant factor. The personal factors include clothing and activity levels. Clothing
is dependent on not only the weather or season, but also the standard attire for the
occupants. Thermal comfort is addressed in this credit and in both IEQc71 and IEQc7.2.
This credit (6.2) gives flexibility in the thermal control for many individuals or groups
so that they can readily change one or more of the environmental factors to suit their
preferences. Thermal comfort is considered to be very important, particularly for
economic reasons, as comfort is a main factor in productivity and job satisfaction.
IEQc6.2 is worth one point in both LEED 2.2 and LEED 2009.

USGBC Rating System
LEED-NC 2.2 lists the Intent, Requirements, and Potential Technologies and Strategies
for IEQc6.2 as follows, with updates to LEED 2009 as noted: