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Domain

A group of computers and devices on a network that are administered as a unit with common rules and procedures. Within the internet, domains are defined by the IP address. All devices sharing a common part of the IP address are said to be in the same domain

Diversity (from ASHRAE, industry)

Two definitions for diversity exist, diverse routing and diversity from maximum:
* Systems that employ an alternate path for distribution are said to have diverse routing. In terms of an HVAC system, it might be used in reference to an alternate chilled water piping system. To be truly diverse (and of maximum benefit), both the normal and alternate paths must each be able to support the entire normal load.

Diversity (from ASHRAE)

A factor used to determine the load on a power or cooling system based on the actual operating output of the individual equipment rather than the full-load capacity of the equipment

Disk Unit

Hard disk drive installed in a piece of data communications equipment, such as a personal computer, laptop, server, or storage product

Direct Expansion (DX) System

A system in which the cooling effect is obtained directly from the refrigerant. It typically incorporates a compressor, and in most cases, the refrigerant undergoes a change of state in the system

Dichotomous Sampler

Piece of measurement equipment that collects airborne particulates and separates them by size for analysis

Dew point

The temperature at which water vapor has reached the saturation point (100% relative humidity)

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