Building Science Adventures In Building Science

Joseph Lstiburek, Ph.D., P.Eng, ASHRAE Fellow

www.buildingscience.com Building Science Corporation Joseph Lstiburek 2

“It isn’t what we don’t know that gives us trouble, it’s what we know that ain’t so”

Will Rogers

“There are known knowns. These are things we know. There are known unknowns. There are things that we know we don’t know. But there are also unknown unknowns. There are things we don’t know we don’t know.

Donald Rumsfeld

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Order of Magnitude

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Order of Magnitude 1 to 10 10 to 100 100 to 1000 1000 to 10000 First Order Effects, Second Order Effects….

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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 – Equal Systems 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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Moisture Flow Is From Warm To Cold Moisture Flow Is From More To Less

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Moisture Flow Is From Warm To Cold Moisture Flow Is From More To Less

Thermal Gradient – Thermal Diffusion Concentration Gradient – Molecular Diffusion

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Moisture Flow Is From Warm To Cold Moisture Flow Is From More To Less

Thermal Gradient – Thermal Diffusion Concentration Gradient – Molecular Diffusion

Vapor Diffusion

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Thermodynamic Potential

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Damage Functions

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Damage Functions Water Heat Ultra Violet Radiation

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Damage Functions Water Heat Ultra Violet Radiation

Oxidization (Ozone) Fatigue (Creep)

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The Three Biggest Problems In Buildings Are Water, Water and Water…

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80 Percent of all Construction Problems are Related to Water

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Heat Air Moisture

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HAM

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Hygrothermal Analysis

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Surface Energy Water (20 C) 73 dynes/cm Water (100 C) 59 dynes/cm Epoxy 46 dynes/cm Polyethylene 31 dynes/cm Soapy water 30 dynes/cm Paraffin wax 25 dynes/cm Silicone 24 dynes/cm Teflon 18 dynes/cm

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Calculating capillary rise

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Capillary rise versus diameter

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diameter [inch]

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Rain Screen

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Beer Screen?

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Don’t Do Stupid Things

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