Term
Absolute Humidity
aka
Humidity Ratio |
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Definition
| Air moisture content expressed in grains (or pounds) of water vapor per pound of dry air. |
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Term
Absorptance
aka
Absorptivity |
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Definition
| The ratio of a solar energy absorbed to incident solar. |
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Term
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Definition
| A solid material's ability to draw in and hold liquid or gas. |
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Term
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Definition
| Lighting that illuminates walls, reducing brightness contrast between walls and ceilings or windows. |
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Term
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Definition
| Lighting spread throughout the lighted space for safety, security, and aesthetics |
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Term
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Definition
| Any part of the building shell that offers resistance to air leakage. The air barrier is effective if it stops most air leakage. |
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Term
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Definition
| The most effective of a series of air barriers |
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Term
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Definition
Air Changes per Hour at 50 pascals
The number of times that the complete volume of a home is exchanged for outside air each hour, when a blower door depressurizes the home to 50 pascals. |
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Term
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Definition
| Cooling buildings with a refrigeration system. More generally means both heating and cooling. |
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Term
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Definition
| The total building air exchanged with the outdoors through air leakage and ventilation |
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Definition
| A steel cabinet containing a blower with cooling and/or heating coils connected to ducts. |
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Term
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Definition
| A material made of brittle mineral fibers that damage lungs and other bodily tissues. (Look for white fabric wrapped around things as insulation) |
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Term
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Definition
| The process of identifying energy conservation opportunities in buildings. |
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Definition
| A unity of measurement of electrical current flow. A coulomb per second. |
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Definition
Annual Fuel Utilization Efficiency
A laboratory-derived efficiency rating for heating appliances which accounts for chimney losses, jacket losses, and cycling losses. |
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Definition
| The yearly savings divided by the initial cost needed to achieve the savings, expressed as a percent. |
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Term
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Definition
| The temperature difference between the fluid inside a heat exchanger and the fluid outside it. |
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Term
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Definition
| A heating control that switches the burner or the circulator in a hydronic heating system. |
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