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| Hearth
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That part of the foor directly in front of the fireplace, and the floor inside the fireplace on which the fire is built. It is made of fire-resistant masonry. |
| Heartwood
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The wood of a tree that reaches from the pith (the soft core or center) to the sapwood (where cells have hardened). This wood may contain phenoloic compounds, gums, resins, etc. making it darker and more decay resistant. Redwood is an example of a wood that is used specifically for its durable qualities. |
| Heat
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A form of thermal energy resulting from combustion, chemical reaction, friction, or movement of electricity. As a thermodynamic condition, heat, at a constant pressure, is equal to internal or intrinsic energy plus pressure times volume. |
| Heat absorbing glass
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Window and skylight glass that contains iron to absorb heat, thus reducing the heat transmitted through the glass. |
| Heat balance
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The outdoor temperature at which a building's internal heat gain (from people, lights and machines) is equal to the heat loss through windows, roof and walls. |
| Heat capacity
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The amount of heat necessary to raise the temperature of a given mass one degree. Heat capacity may be calculated by multiplying the mass by the specific heat. |
| Heat collector
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Also referred to as a solar collector or solar panels, it collects heat from the sun, which is turned, into energy that is used most commonly to heat water for the home or pool. There are different forms of collectors. |
| Heat content
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The amount of heat in a quantity of matter at a specific temperature and pressure. |
| Heat engine
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A device that produces mechanical energy directly from two heat reservoirs of different temperatures. A machine that converts thermal energy to mechanical energy, such as a steam engine or turbine. |
| Heat exchanger
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Apparatus, which transfers heat from one fluid to another in cooling or heating systems. Air conditioners use both a condenser and an evaporator. Steam and hot water radiators are heat exchangers, which are used to produce heat. |
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