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| The ability of water to move through materials, even upward against gravity, through small tubes or spaces |
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| A material or air space desgined to stop capillary action from carrying water into a building |
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| One of two main products of complete combustion of a hydrocarbon (the other is water vapor). |
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| A mastic compound for filling joints and cracks. |
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| A temperature scale on which water freezes at 0 degrees C and boils at 100 degrees C. |
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| Insulation, packaged in bags for blowing, made from newspaper or wood waste and treated with a fire retardant. |
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| The number of cubic feet per minute of air flowing through the fan housing of a blower door when the house pressure is 50 pascals (0.2 inches of water). This figure is the most common and accurate way of comparing the airtightness of buildings that are tested using a blower door. |
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| The number of cubic feet of air flowing through a house from indoors to outdoors during typical, natural conditions. This figure can be roughly estimated using a blower door. |
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| A device that disconnects an electrical circuit from electricity when it senses excessive current. |
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Coefficient Of Performance
A heat pump or air conditioner's output in watt-hours of heat moved divided by watt-hours of heat moved divided by watt-hours of electrical input. |
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| A snakelike piece of copper tubing surrounded by rows of aluminum fins that clamp tightly to the tubing in order to aid in heat transfer. |
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Color-Rendering Index
A measurement of a light source's ability to render colors the same as unlight. CRI has a scale of 0 to 100. |
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| A measurement of the warmness or coolness of a light source in the Kelvin temperature scale. |
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| A vertical building support usually made of wood or steel. |
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| The rating for building materials that will burn under some conditions |
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| air that provides oxygen for combustion |
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| a device used to measure steady-state efficiency of combustion heating units. |
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| The area inside the heat exchanger where the flame burns. |
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| Synonymous with fuel-burning efficiency or steady-state efficiency. Usually means the latter. |
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| the process of testing and adjusting building mechanical systems after building construction or as a retrofit measure. |
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| A motorized vapor pump that compresses the gaseous refrigerant and sends it to the condenser where collected heat is released. |
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Definition
| When a gas turns into a liquid as it cools, we say it condenses. Condensation is the opposite of evaporation. |
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| The coil in an air conditioning system where the refrigerant condenses and releases heat. |
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| Liquid formed by condensing vapor |
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| A tank for catching returning condensate water from a steam heating system |
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| Heated or cooled areas of a building are said to be conditioned, either intentionally or unintentionally. |
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| The property of a material to conduct some energy form like heat or electricity |
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| Heat flow from molecule to molecule in a solid substance. |
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| Difference in brightness of areas in the lit environment. |
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| A cicuit whose work is switching a power cicuit or opening an automatic valve. |
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| The transfer of heat caused by the movement of a fluid like water or air. When a fluid becomes warmer it becomes lighter and rises. |
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Definition
| The maximum rate of heat removal required of an air conditioner when the outdoor temperature and humidity are at the highest expected level. |
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| having an acceptable payback, return-on-investment, or savings-to-investment ratio. |
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| A view of a building component drawn or imagined by cutting through the component. |
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Cubic Foot per Minute
A measurement of air movement past a certain point or through a certain structure. |
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| A wall between columns and beams that supports no weight but its own. |
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