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TAB
see testing, adjusting, and balancing.
TAB technician
the person who measures and adjusts the system.
tank
receptacle, open or closed, for holding, transporting, or storing fluids.
tankless heater
a heat exchanger for indirect heating of water, typically for domestic use, which is designed to be used without a water storage tank. See instantaneous heater.
tap
manually operated device on the end of a pipe in a fluid supply system to enable drawing off quantities of the fluid.
task/ambient conditioning (TAC) system
any space-conditioning system that allows occupants to individually control the thermal environment in the localized zone of their workspace while still maintaining acceptable environmental conditions in the surrounding ambient spaces.
TD
see temperature difference.
temperature
measurement of warmth or coldness with respect to an arbitrary zero or to the absolute zero. Temperatures are indicated on defined scales, such as Kelvin and Rankine for absolute temperatures, and Celsius and Fahrenheit for ordinary temperatures.
temperature controller
device that responds directly or indirectly to deviation from a desired temperature by actuating a control or initiating a control sequence.
temperature difference
difference between the temperatures of two substances, surfaces, or environments involving transfer of heat.
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About ASHRAE Terminology

ASHRAE Terminology, a free resource, is a comprehensive online glossary of more than 3700 terms and definitions related to the built environment, with a focus on heating, ventilating, and air conditioning (HVAC), as well as refrigeration, building envelope, electrical, lighting, water and energy use, and measurement terms.

This searchable glossary was designed for use by engineering professionals but is also useful for architects, building owners and operators, educators, public officials, and homeowners.

The terms in ASHRAE Terminology have been assembled and defined and are updated on an ongoing basis by ASHRAE Technical Committee (TC) 1.6, Terminology. TC 1.6 is concerned with terminology, nomenclature, definitions, abbreviations, symbols, and the International System (SI) and Inch-Pound (I-P) units used in the fields of heating, ventilating, air conditioning, water heating, and refrigeration.

To request a free electronic file of the complete list of terms and definitions, email ashraetermseditor@ashrae.org.