Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
visit ASHRAE's Bookstore.
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| digital indication |
1. digital display.
2.
direct numeric readout of a measurable property or condition.
3.
displaying of data in an electrical readout based on the use of discrete
integral numbers. |
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| digital transmission |
transmission of data in a serial format of two
discrete signal levels on a discrete time interval. |
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| diluent | neutral fluid added to another fluid to reduce
the concentration of the second fluid in a mixture. |
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| dimensionless number |
ratio of various physical properties (such as
density or heat capacity) and conditions (such as flow rate or mass), of such
nature that the resulting number has no defining units of mass, rate, etc. Also
called a nondimensional parameter |
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| direct drive |
in a machine, the drive and the driven units are
directly coupled, either by a common shaft or by a mechanical coupling |
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| direct exhaust system |
mechanical appliance venting system supplied or
recommended by the manufacturer through which the products of combustion pass
directly from the appliance to the outside, and which does not employ a means
of draft relief. |
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| direct vent system (appliance) |
system supplied by a manufacturer which
provides outdoor air directly to a unit for combustion and for draft relief,
if the unit is equipped with a draft control device, and which provides for
discharge of all flue gases to the outside atmosphere |
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| discharge line (hot-gas line) |
line through which refrigerant vapor flows from
a compressor to a condenser |
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| discharging (thermal storage) | withdrawing cooling or heating capacity from
storage |
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