Vapor
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Understanding Vapor Movement, Permeance, and Permeability in Building Materials - Prof. De, Study notes of Introduction to Business Management
The concepts of vapor pressure, vapor movement, permeance, and permeability in the context of building materials. It discusses how vapor moves from areas of high pressure to low pressure, causing vapor to pass through cracks and materials during cold weather. The document also introduces the concept of permeance as a measure of water vapor flow through a material or assembly of materials, and permeability as the permeance of a 1” thickness of a homogeneous material. Lastly, it explains how the amount and rate of water vapor transmission through a building material depends on the differential in vapor pressure, the area of the material, and its permeance.
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2010/2011
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Vapor
Vapor Movement
- (^) Vapor Pressure like other gasses move from an area of high pressure to an area of low pressure
- (^) Until equilibrium is established
- (^) During cold weather, the difference in pressure from inside to outside causes vapor to move out through every possible crack and/or directly through materials (permeable materials)
Permeability
- (^) Is the permeance of a 1” thickness of a homogenous material
Water Vapor Transmission Rate
- (^) The amount and rate of water vapor transmission through a building material depends on: - (^) Differential in vapor pressure from one side of the material to the other - (^) The area of the material - (^) It’s permeance - (^) (it’s ability to permit vapor passage)