It may seem counter-intuitive for an energy modeling
consultant to suggest that the real
value proposition for energy modeling is not
energy performance accounting. But that
is what I am suggesting. The most
significant value proposition for energy modeling is:
The Use of Modeling to
Inform the Integrated Design of a High Performance Building from Start to
Completion
This is my goal for all energy modeling and all
projects. It is also the motivation
behind my efforts to encourage market-wide development of sophisticated
modeling capabilities. Energy modeling is an extremely powerful design tool,
when applied by the right practitioner.
A good model calculates heating and cooling loads for every hour of the
year in every zone within a building design.
Further, it disaggregates loads into contributing components and allows
detailed loads analysis associated with each building component (windows,
walls, lighting, infiltration, etc.) If
we accept that in order to achieve exceptional energy efficiency performance we
must first significantly reduce heating and cooling loads, then it follows that
we should be using energy modeling tools to craft the loads. This implies early design schedule
engagement. One template for early and
ongoing energy modeling engagement follows.
·
Pre-design: Create simple “shoebox” models to study
orientation and massing configurations.
Evaluate design criteria such as indoor and outdoor temperature and
humidity, and minimum ventilation rates.
Use loads as a performance metric.
·
Schematic design: Develop moderately more detailed models that
align with the preferred massing and orientation. Use both loads and energy as complimentary
metrics to test design ideas from façade to systems.
·
Design development: Transition into detailed models that provide
load confirmation for right-sizing of systems, and refine energy performance
associated with component alternatives and system control strategies.
·
Construction documents: Prepare completed design phase models to
finalize project participation and compliance with external energy performance
requirements from energy code to LEED to utility incentive programs.
·
Post-construction period: Use
as-built models to verify energy savings and to study and resolve zonal
load anomalies that may arise in the first year or two of operation.
It is possible to use energy modeling to create
significantly better designs that would have otherwise occurred. This should be the value expectation for
energy modeling on every project.
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