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| One million BTUs or 10 therms |
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| The wood material installed under roofing material to support the roofing |
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| A measure of the temperature element of climate produced by multiplying temperature difference by time. |
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| The peak need for electrical energy. Some utilities levy a monthly charge for demand. |
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| The weight of a material divided by its volume, usually measured in pounds per cubic foot. |
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| Cause to have a lower pressure or vacuum with respect to a reference of a higher pressure. |
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Definition
| A liquid or solid material used to absorb water or water vapor. |
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| A high or low outdoor temperature used for designing heating and cooling systems. |
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Definition
| A heat exchanger that removes the superheat from a compressed refrigerant and transfers that heat to another fluid, usually water |
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Definition
| The warmest temperature of an object in an environment where water condensation from the surrounding air would form on that object. |
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Definition
| Air that enters through the dilution device--an opening where the chimney joins to an atmospheric-draft appliance |
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Definition
| A combustion appliance that draws combustion air from the outdoors and vents combustion products to outdoors. |
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Definition
| A system of pipes or ducts used to distribute energy. |
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Definition
| A vertical window projecting from a roof |
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| A space that allows water storage and drainage in a wall cavity, adjacent to or part of the weather-resistant barrier. |
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Definition
| The pressure in a flue or vent that propels combustion gases out of a building. |
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Definition
| a device located in gas appliance chimneys that moderates draft and diverts down drafts that could extinguish the pilot or interfere with combustion |
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Definition
| A fan that depressurizes the combustion chamber or venting system to move combustion products through the appliance. |
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Definition
| Gypsum interior wallboard used to produce a smooth and level interior wall surface and to resist fire |
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Definition
| Normal ambient air temperature measured by a thermometer |
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Definition
| A blower-door-like device used for testing duct leakiness and air flow. |
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Definition
| The ration of output divided by input |
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Definition
| The number of lumens produced by a watt used for lighting a lamp. Lighting efficiency. |
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Definition
| Describes controls where switching is performed by transistors and other solid-state devices. |
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Definition
| Describes controls where switching is performed by an automatic mechanical device like a bimetal or bulb-and-bellows. |
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Definition
| The ability of a material to emit radiant energy from its surface. |
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Definition
| The building shell that encloses the building's interior spaces. |
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Definition
| a quantity of heat or work |
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Definition
| the conversion or transformation of potential energy into kinetic energy for heat, light, electricity, ect. |
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Definition
| term describing how efficiently a building component uses energy. |
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Definition
Energy Efficiency Ratio
A measurement of energy efficiency for air conditioners or heat pumps. The EER is computed by dividing cooling capacity, measured in BTUH, by the watts of power. |
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Term
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Definition
| The fraction of water heater iput remaining in 64 gallons of hot water extracted from a water heater |
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Term
| Energy-recovery ventilator |
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Definition
| a ventilator that recovers latent and sensible energy from the exhaust airstream and imparts it to the incoming airstream. |
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Definition
| The internal heat of a material measured in BTUs per pound. |
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Definition
| The building shell. The exterior walls, floor, and roof assembly of a building. Also sometimes denotes a building cavity or building assembly. |
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| Environmentally sensitive |
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Definition
| A person who is highly sensitive to pollutants, often because of overexposure, is said to be environmentally sensitive |
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Definition
| The length of straight pipe or duct that has equivalent resistance to a pipe or duct fitting. Used for piping and duct design. |
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Definition
| The change that occurs when a liquid becomes a gas. Evaporation is the key process in the operation of air conditioners and evaporative coolers. |
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Definition
| a device for cooling homes in dry climates that cools the incoming air by humidifying it. |
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Definition
| The heat transfer coil of an air conditioner or heat pump that cools the surrounding air as the refrigerant inside the coil evaporates and absorbs heat. |
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Definition
| air flowing out of a residence from its conditioned space through the shell |
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Definition
| a valve that meters refrigerant into the evaporator |
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