Environmental Guidelines
DVN 5000
24-10520-22 Rev. –
9
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2009 Johnson Controls, Inc.
N
OTE
The enclosure diagrams in the following sections are protected by
copyright and are the sole property of Middle Atlantic Products, Inc
("Middle Atlantic Products").
Maintaining a proper temperature inside equipment racks is
critical
to the proper
functioning and survival of the DVN equipment operating within it. To effectively control
the temperature, take a system (integrated) approach to thermal management.
Figure 3: Sample Equipment Racks (Middle Atlantic DRK and WRK Series Models Shown)
Thermal design of equipment racks and enclosures is essential for the continued functioning
of DVN equipment when subjected to the surrounding environment. The most robust designs
for thermal management, for instance, occur in the telecommunications industry, where
equipment reliability can literally be a matter of life and death. People expect an immediate
dial tone when they lift the receiver, even during a power failure.
Definitions
Baffle
– An object, such as a plate, used to direct or control the movement of air
within a confined area
BTU/Hr.
– British Thermal Units per Hour (of heat); 12,000 BTU/Hr. = 1 Ton of air
conditioning
CFM
– Cubic Feet per Minute (of airflow)
Chimney Effect
– The natural process of heat flowing upwards
Convection
– The process of air passing over a hot object and carrying the heat away
HVAC
– Heating, Ventilation, and Air-conditioning