Retrotec USACE - Manual (Page 124)

A10 ENERGY & PROCESS ASESSMENT PROTOCOL
For electrical consumption, the following are selected:
1960–1980 + < 1,000 m 1. 2
Post-1980 + < 1,000 m 2. 2
A.5.2.4 ECM Selection
In contrast to the small portfolio example, this large building stock contains
buildings from all age groups with EUIs higher than average. This being the
case, ECMs can be selected to both upgrade older buildings to the current
state of technology and to improve the newer buildings beyond the current
standard for effi ciency. This could include anything from the addition of a solar
wall to the implementation of a ground source heat pump.
A.6 Conclusions
The methodology presented above allows for screening, evaluating, and man-
aging a building portfolio. This would include estimating potential energy up-
grades and costs, selecting typical ECMs to employ, and determining which
buildings offer the best return on investment. It provides a consistent and ef-
fective approach for owners, portfolio managers, and investors as well as for
sustainability planners. It aids decision-making regarding the retrofi t of the
buildings and the types of intervention. It also lends itself to continuous modi-
fi cation as better data is obtained and objectives change. The characteristics of
a portfolio analysis that make it a vital tool in strategic management of build-
ing assets also disqualify it for decision-making at the building level, since it is
based on typical buildings. Building-level decisions should be based on analysis
and evaluation of individual buildings.