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Tempered Glass Treated glass that is strengthened by reheating it to just below the melting point and then suddenly cooling it. When shattered, it breaks into small pieces. Approximately five times stronger than standard annealed glass is required as safety glazing in patio doors, entrance doors, side lights, and other hazardous locations. It cannot be recut after tempering. Terrace A finished, but unroofed, outdoor area adjacent to, and accessible from a house or other structure usually at grade or slightly elevate. Test Light A light provided with test leads, used to test or probe electrical circuits to determine if they are alive. Therm A therm is a unit of measure for natural gas. You will find this term used on your gas bill. Thermal Of or pertaining to heat or temperature. Thermal Break An element of low conductance placed between elements of higher conductance to reduce the flow of heat. Often used in aluminum windows. Thermal Comfort Thermal comfort is generally defined as that condition of mind, which expresses satisfaction with the thermal environment (e.g. In iso 1984). The thermal comfort condition is a subjective feeling of satisfaction building designers attempt to satisfy as many of the occupants as possible (usually 80 % or more). The body as a whole being too warm or cold, or may cause dissatisfaction by unwanted heating or cooling of a particular part of the body (local discomfort). Thermal Conductivity Material property indicating how easily heat travels through material. It depends on the physical structure of matter at both the molecular and atomic level as well as the state of matter, solid, liquid, or gas. Thermal Expansion Pressure and temperature regulation valve, located in the liquid line, which is responsive to the superheat of the vapor leaving the evaporator coil. Change in dimension of a material as a result of temperature change. Thermal Insulation Material that has a high resistance to the passage of heat used to block the passage of heat from a warm building to the exterior when outdoor temperatures are low and the entrance of heat into a cooled interior when outside temperatures are high. Thermal Mass Mass in a building (furnishings or structure) that is used to absorb solar gain during the day and release the heat as the space cools in the evening. Thermochromics Glazing with optical properties that can change in response to temperature changes. Thermocouple A device consisting of two junctions of dissimilar metals. When the two junctions are at different temperatures, a voltage is generated. Used in controlling gas valves. Thermogram An image of an object taken with an infrared camera that shows surface temperature variations. Thermometer Device to measure and/or evaluate temperature. Thermostat A device that is electrically operated and actuated by thermal conduction or convection and automatically acts to establish and maintain a desired temperature. A device that allows you to control the temperature inside your home, by telling the heating or cooling system how much air to produce. Unit that monitors and controls your HVAC system products. Thermostatically Controlled Ventilator A ventilator normally found in the attic that goes on and off automatically depending upon the temperature. Three Phase A system of voltages (or currents) used for large-scale electrical power generation and transmission/distribution. Three-Dimensional Shingles See laminated shingles Threshold A strip of wood, stone or metal that is placed beneath a door. The member that lies at the bottom of a sliding glass door or swinging door the sill of a doorway. Thumbscrew Screw with a special head that can be turned with thumb and forefinger. Tie A device that joins two or more structural members e.g., timber, rod, chain, clip, wire. Tie Beam A structural member used to hold two separated members together. Tilt Window A single- or double-hung window whose operable sash can be tilted into the room for interior washability. Time Schedule A record of desired changes of a variable or operational status with respect to time. Time-Sequence Control In digital control, systems, the state of the next output is determined by the lapse of time from the start of the previous state. Such a process is usually encountered as part of an overall sequence involving functional dependence. (see function sequence systems.) It is a characteristic of this type of control sequence that it depends only on the passage of a fixed amount of time and not on the state of any variable in the system. Tinted Glass Glass colored by incorporation of a mineral admixture. Any tinting reduces both visual and radiant transmittance. Ton A unit of measure for cooling capacity. One ton=12,000 BTU's per hour. Heat pumps and air conditioners are generally sized in tons. Typical sizes for single-family residences are between two and five tons. It is important to note that actual capacity is not constant and will change based on outdoor or indoor temperatures. The published capacity rating of air conditioners and heat pumps is based on performance at the ARI standard temperature levels of 95 f outside, 80 f inside. Top Lap That portion of the roofing covered by the succeeding course after installation. Total CHS Services, Inc. Comfort System The ultimate solution to providing you with consistent, customized home comfort, despite the ever-changing weather. Total Surface Area The sum of the primary surface area and secondary surface area. TPRV Temperature, pressure, relief valve. A safety valve found on modern hot water heaters that will relieve hot water pressure when the temperature or pressure reaches 210 deg Fahrenheit or 150 PSI, respectively. Trailer A mobile home, a house trailer- archaic names for a manufactured home. A recreational vehicle used for traveling with "homey" comfort. Transfer Air The movement of indoor air from one space to another. Transformer Electrical device that raises or lowers voltage in a circuit. Transmittance The percentage of radiation that can pass through glazing. Transmittance can be defined for different types of light or energy, e.g., visible light transmittance, UV transmittance, or total solar energy transmittance. Transom A horizontal transverse beam or bar in a frame a crosspiece separating a door or the like from a window or fanlight above it. Also, a window above a door or other window, built on and commonly hinged to a transom. Transom Window The window sash located above a door. Also called transom light. Traverse Window A type of window containing two movable sashes set in separate grooves, permitting the windows to slide past each other horizontally. |