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ARE - BS - Enviro


Latent Heat Heat required to convert a solid into a liquid or vapor, or a liquid into a vapor, without change in temperature, given in BTU
Sensible Heat Amount of energy released or absorbed by a chemical substance during a change of temperature, changes the temperature but not the state, given in BTU
Relative Humidity Ratio of moisture content of the air to the max possible moisture content at the same temperature
Radiation The transfer of heat between surfaces that are not in direct contact
Conduction The transfer of heat between two objects that are in direct contact
Convection The transfer of heat that requires a fluid medium like air to transfer
Evaporation Liquid is absorbed into the air as latent heat
Degree Day (DD) The average yearly difference between the indoor temperature and outdoor temperature.
Design Day Used to design and size a heating system that determines the day cooler than 98% of all days in the year experienced in a particular climate
Dry Bulb Temperature Runs vertically on a psychrometric chart. Typical temperature measure with a standard thermometer
Wet Bulb Temperature Measured with a sling psychrometer. The lowest temperature that can be reached under current ambient conditions by the evaporation of water only, given in degrees farenheit
Dew Point The temperature at which water vapor starts to condense out of the air
Mean Radiant Temperature Average radiant temperature of your surroundings and is independent of air temperature
Solar Heat Gain Coefficient (SHGC) Ratio of solar heat gain through fenestration to the total solar radiation incident (falling upon/striking) on the glazing (0.0-0.87)
Shading Coefficient Ratio of solar heat gain through a glazing product to the solar heat gain through an unshaded 1/8" thick clear double strength glass under the same set of conditions
Mass Walls Thick walls placed in sunlight, behind a large window or glass skin.
Trombe Walls Mass walls + convective loop
Water Walls Tank or collection of large vertical tubes that are filled with water and put by a window, allowing some light to get into the space
Indirect Gain Space Heated by reflected sunlight or warm air in the room
Sun Spaces/Rooms Isolated thermal storage room
Created by: skbehm