Envelope to Mechanical Simplified Trade Off Analysis
Envelope to Mechanical Simplified Trade Off Analysis is an add-on to the ventilation calculator.
The Energy Code allows flexibility in implementing its intent. What matters is that energy savings are achieved, not so much how they are achieved.
This module is used to compare the energy loss through a thermally inferior envelope with the energy saved with a superior mechanical system. If the energy savings
are positive, despite the inferior envelope, the intent of the Energy Code is exceeded.
The Envelope to Mechanical Simplified Trade-Off module is especially handy for historic buildings. Measures to bring the envelope up to the prescriptive code
requirements may destroy the character of the building, whereas improvements in the mechanical system can be implemented behind the scenes and often at
a lower cost to achieve equivalent or greater energy savings.
From the International Energy Conservation Code (IECC):
Marcia Karr, P.E.
is a mechanical engineer with more than 30 years experience in engineering, construction, maintenance and as a building codes plans examiner.
Carolyn Roos, Ph.D.
has 20 years experience as an energy engineer, specializing in the development of technical software for engineers.