| 1. A measure of how much energy is needed to heat up a substance. 2. The quantity of heat needed to warm a collector up to its operating temperature.
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| A unit of heat flow that is used for specific thicknesses of material or for materials of combination construction, such as laminated insulation. The formula for thermal conductance is. C = k times the thickness in inches
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| The heat energy that will be transmitted by conduction through one square foot of one inch thick homogeneous material in one hour when there is a difference of 1 degree Fahrenheit perpendicularly across the two surfaces of the material. The formula for thermal conductivity is. k = BTU/SQUARE FOOT/INCH/HOUR/DEGREE FARENHEIT.
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| An overcurrent protective device which contains a heater element in addition to and affecting a renewable fusible member which opens the circuit; it is not designed to interrupt short circuit currents.
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| A compression crack caused by expansion of peripheral building components.
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| The tendency of a building to remain at the same temperature or to fluctuate only very slowly.
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| Material used to retard the flow of heat through an enclosing surface.
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| An insulation material that lowers the thermal conductivity of a part of a building system, such as a floor, wall, ceiling, or roof assembly.
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| The time interval between the time heat enters a material at one side and exits at the other side.
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| The expansion and contraction of any material caused by temperature differences.
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| An electrical device that automatically opens a circuit in the event of overheating, thereby protecting the appliance from possible damage.
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| Electromagnetic radiation emitted by a warm body.
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| Heat operated electrical control used to open or close a refrigeration system electrical circuit; this system uses a resistance wire to convert electrical energy into heat energy; also called Hot Wire Relay.
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| An index of a materials resistance to heat flow; it is the reciprocal of thermal conductivity (k) or thermal conductance (C). The formula for thermal resistance is.
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| 1. Stress built up by sudden and appreciable changes in temperature. 2. The shock produced and also the stress produced resulting from sudden temperature changes in a roof membrane; for example, when a rain shower follows brilliant sunshine. 3. A stress created by an extreme change in temperature that may result in cracking of the plaster which has not yet attained its ultimate strength.
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| Insulative material applied to pipes, fittings, boilers, tanks, ducts or other interior structural components to prevent heat loss or gain or water condensation.
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| The resistance factor to the conductance of heat.
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| Pertaining to heat.
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| A semiconductor which has electrical resistance that varies with temperature.
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| Electrical instrument using thermocouple as source of electrical flow, connected to a milliammeter calibrated in temperature degrees.
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| A pair of dissimilar metals create a thermoelectromotive force that can be measured and converted to temperature differences.
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| Electrical switch with bimetal disk controlled by temperature changes.
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| The science dealing with the relationship between heat and other forms of energy.
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| Refrigerator mechanism that depends on Peltier effect; direct current flowing through electrical junction between unlike metals provides heating or cooling effect depending on direction of flow of current.
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| Device for measuring temperatures.
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| A number of thermocouples used in parallel to achieve low temperatures.
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| Tradename; atype of glass constructed in a manner to protect against sound, heat, heat loss or moisture; double or triple glazed glass.
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| Number of thermocouples used in series to create a higher voltage.
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| Glues and resins that are capable of being repeatedly softened by heat and hardened by cooling.
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| Having the property of softening when heated and rehardening when cooled.
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