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Tune into the
Edifice Complex Podcast by host Adam Muggleton and
Robert Bean
2023 Building Science Spring Camp,
Stratford, ON.: Exergy
Hosted by
Building Knowledge Canada
Download slides (Easy access password - limited time only =
2023.BKC.Bean.Exergy)
Abstract:
We have known for a very long time that the
conversion from a chemical energy to a thermal energy
creates entropy and destroys it's exergy, but the energy is
always conserved.
Exergy is the quality of the energy and
describes (in part) its potential capacity to do work.
Exergy efficiency examines the potential of a
conversion relative to the work done from its highest
reservoir state to its lowest.
The objective in any conversion process is to
obtain maximum work with the least amount of entropy
observed in the forms of heat, light, sound and vibration.
Combustion, especially with hydrocarbons
creates industrial grade temperatures far hotter than what
is needed for space heating and domestic water generation.
The latter are non industrial grade requirements. Using
natural gas exclusively for heating buildings is a waste of
its exergy because it is capable of doing far more work.
There is a paradox in using gas in higher
performance buildings that needs to be unveiled to the world
of property development.
This presentation explores the principles of
exergy as it relates to architecture, building sciences,
mechanical systems and how human factors ultimately
establish the required limits in temperatures needed for
buildings.
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Download the book:
Thermal Comfort Principles and Practical Applications for
Residential Buildings
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