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Glossary
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Saturation point
The
maximum humidity ratio that can be held at specific temperature. The
"saturation line" on the psychrometric chart depicts the saturation points
for all listed dry-bulb temperatures.
Sensible heat
Refers
to the amount of "dry" heat in the air related the the dry-bulb temperature.
I-P units: Btu/lb (of dry air).
Solar reflectance
The
ratio of the reflected component of incident solar energy to the total
amount of incident solar energy over wavelengths of approximately 0.3 to 2.5
micrometers.
Specific heat
The
quantity of heat needed to increase the temperature of one unit of mass one
degree of temperature. I-P units: Btu/lb•°F
Specularity
Refers
to the diffuse nature of a surface (the inverse of which is its surface
roughness). A surface's specularity is typically described in terms of a
value between zero and one (0-1), in which 0 represents absolute diffusion,
such as a very rough surface, and 1 represents a completely flat specular
mirror.
Sunspace (SS)
A
sunspace
is a passive solar
heating strategy consisting of a southward-oriented glassed-in room (similar
to a greenhouse or atrium) separated from the rest of the building by a
common wall. Heat is transferred from the sunspace to the adjacent living space(s) either via conduction (through a thermal mass) or via convection
(through vents and/or openings in the common wall). Present thermal mass
serves to stabilize the interior temperature of both the sunspace and the
building.
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