Retrotec USACE - Manual (Page 122)

A8 ENERGY & PROCESS ASESSMENT PROTOCOL
A.5.1.3 Building Selection
Two observations can be made when looking at the results of the archetype
analysis:
(1950–1975 + < 1,000 m 1. 2 ) buildings are high consumers of natural gas
when compared to the average.
(Pre-1960 + 1,000–5,000 m
2. 2 ) and (pre-1960 + > 5,000 m 2 ) buildings are
consuming higher than average amounts of electricity.
There may be a number of explanations that justify greater-than-average
EUI in these buildings. More intensive occupancies, greater environmental
requirements, local climate, and the like may explain the energy usage. Other-
wise, lacking such justifi cations, such buildings should be assessed with priority
since their potential savings are greater.
A.5.1.4 ECM Selection
The selection of ECMs will refl ect those necessary to transform the archetype
into current practice. The selection will also address any reported problems.
In this example, the ages of the buildings can be a contributing factor in
ECM section. Recent innovations have improved the effi ciency and effective-
ness of mechanical systems and the insulating capacity of envelope materials
in buildings.
Since it was observed that the offi ces with high EUIs were constructed
prior to 1975, then ECMs that focus on these buildings could include upgrades
to the existing mechanical systems as well as improvements to the building
envelope and airtightness.
A.5.2 Example 2: Large Building Portfolio
A.5.2.1 Portfolio Defi nition
A larger sample set of buildings will be used in this example. In 2000, Natural
Resources Canada: Offi ce of Energy Effi ciency conducted a survey of all com-
mercial and institutional offi ce buildings in the country. In the survey statistical
data on these buildings were collected and sorted according to the following
criteria:
Total number of buildings ■
Floor space ■
Occupancy ■
Energy retrofi t activity ■
Energy effi ciency features ■
Energy sources ■
Heating energy and equipment ■
Cooling energy and equipment ■