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Building Science
ZERH
Joseph Lstiburek, Ph.D., P.Eng, ASHRAE Fellow
www.buildingscience.com
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What is a Building?
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A Building is an Environmental Separator
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• Control heat flow • Control airflow • Control water vapor flow • Control rain • Control ground water • Control light and solar radiation • Control noise and vibrations • Control contaminants, environmental hazards and odors • Control insects, rodents and vermin • Control fire • Provide strength and rigidity • Be durable • Be aesthetically pleasing • Be economical
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Zeroth Law – A=B and B=C therefore A=C First Law - Conservation of Energy Second Law - Entropy Third Law – Absolute Zero
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2nd Law of Thermodynamics
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In an isolated system, a process can occur only if it increases the total entropy of the system
Rudolf Clausius
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Heat Flow Is From Warm To Cold Moisture Flow Is From Warm To Cold Moisture Flow Is From More To Less Air Flow Is From A Higher Pressure to a
Lower Pressure
Gravity Acts Down
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Water Control Layer Air Control Layer Vapor Control Layer Thermal Control Layer
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