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18 Cards in this Set
- Front
- Back
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sabins
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units of sound absorption
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psychrometric chart
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graph which plots relative humidity and air temperature
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coefficient of heat transmission (u)
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overall rate of heat flow through any combination of materials (including air spaces) in an exterior or interior assembly; reciprocal of the sum of resistances in the assembly (1/ΣR)
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conductance
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amount of energy to pass through 1 sf of a homogeneous material of a given thickness
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conductivity
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amount of energy to pass through 1 sf x 1 in thick piece of a homogeneous material
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dry-bulb thermometer
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measures temperature of air-water mixture
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enthalpy
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total heat in a substance, including latent heat and sensible heat
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insolation
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total solar radiation on a horizontal surface
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latent heat
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heat that causes a change of state in a substance (ex: the heat required to change water to steam)
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sensible heat
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heat that causes a change in temperature of substance, but not a change of state
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specific heat
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measures a material's capacity to store heat
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sling psychrometer
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thermometer with a moist cloth around the bulb which is then swung rapidly to cause the moisture to evaporate; a low wet-bulb temperature indicates dry air and vice versa
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relative humidity
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the ratio of %moisture in the air to the maximum amount of moisture the air can hold without condensing
if wet-bulb and dry-bulb readings are the same, then 100% relative humidity; a large difference indicates low relative humidity |
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emissivity
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ratio of an object's ability to absorb/radiate heat to that of a black body
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mean radiant temperature
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weighted average of various surface temperatures in a room, their angles of exposure to the occupant, and any sunlight present
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operative temperature
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average of the air temperature and the mean radiant temperature
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psychrometric chart
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graphically represents the interactions between heat, air, and moisture to study water vapor content of air
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furnace v. boiler
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furnace: burn fuel to heat air, which is then distributed
boiler: burn fuel to heat water, steam or hot water used to distribute |
