Page 171 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

LEED Ener gy and Atmospher e 149

Energy-Related Component
Section 5 Building envelope (including semiheated spaces such
as warehouses)
Section 6 Heating, ventilating, and air conditioning (including
parking garage ventilation, freeze protection, exhaust
air energy recovery, and condenser heat recovery for
service water heating)
Section 7 Service water heating (including swimming pools)
Section 8 Power (including all building power distribution systems)
Section 9 Lighting (including lighting for exit signs, building
exterior, grounds, and parking garage)
Section 10 Other equipment (including all permanently wired
electric motors)

Source: Courtesy LEED-NC 2.2 Reference Guide.
TABLE 4.0.4 ASHRAE/IESNA 90.1-2004 and 2007 Components Applicable to EAp2 and EAc1

The general energy-related components of the building that are covered by this
prerequisite have been summarized by the LEED-NC 2.2 and 2009 Reference Guides
and are listed in Table 4.0.4.
A review or summary of the extensive calculations needed for the energy performance
is not intended to be a part of this book. There are many energy models used regularly
by energy experts to determine the energy requirements of the building and system.
However, there are a few items that the LEED engineer may find useful in understanding
this prerequisite and its implication to other credits. Six of these are listed as follows:
• There are certain mandatory provisions that must be met in each section listed
in Table 4.0.4. In addition, as previously mentioned, either certain prescriptive
requirements or certain performance requirements must be met.
• If EAc1 Option 1 is sought, the alternative energy simulation documentation
referred to as the Performance Rating Method option in App. G of this same
standard shall be used to document these items of variance from the prescriptive
requirements.
• The United States is segregated into eight climate zones, and there are different
prescriptive requirements for many sections in each of these zones.
• The building envelope requirements in Section 5 of Table 4.0.4 cover many
mandatory items such as insulation, doors, and windows. If the prescriptive
method is used, then there are maximum allowed window and skylight areas
(40 percent of the gross wall area for windows and 5 percent of the roof area for
skylights in LEED 2009). This is important to note as windows and skylights
impact other credits in the indoor Environmental Quality (EQ) category of
LEED. Otherwise, either the cost budget method or the performance rating
method can be used, and the performance requirements have greater flexibility.