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(1) integral covering, sometimes fabric reinforced, that is applied over insulation. Also, the core, shield, or armor of a cable to provide mechanical or environmental protection. (2) sealed space around a piece of equipment or a storage unit, through which a thermal medium can be circulated.
concentrated airstream formed as primary air leaves the diffuser.
jet cooling
quick chilling process using air at very high speed forced around the products, usually while those products are continuously moving on a conveyor belt. Compare to air-blast cooling.
jet freezing
quick freezing process using cold air at very high speed forced onto the produce. Also called blast freezing.
jet pump
ejector or injector pump.
jind filter
a filter used to collect the ASHRAE dust passing a device during an arrestance test.
Josephson effect
set of quantum mechanical phenomena occurring when a current flows through an (electrically) weak link or junction connecting two superconductors (e.g., by tunneling through a dielectric barrier or by flowing through a sufficiently narrow constriction in a superconducting material).
Joule-Thomson effect
ratio of temperature change to pressure change (dT/dp) of an actual gas in a process of throttling or expansion without doing work or interchanging 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.