4
V. Principles of Operation
If ambient air cannot be utilized directly as a cooling medium, another cost-effective
method of cooling is a Water-to-Air system (below). Water is used to remove heat from
the air circulated within the electronics enclosure.
Cooling water is circulated through a tube-and-fin coil. As the heat-laden air circulates
through the coil, the heat is absorbed by the water and carried away, in a continuous
process.
Water-to-Air systems are easy to install and usually require minimum maintenance.
The water used must be reasonably clean and cold enough to ensure proper operation
of the cooling system under the most severe anticipated conditions. In some cases, if
sufficiently cold water is available, below-ambient-temperature cooling can be
achieved.
VI. Specific Model Data
Mounting
Panel Mounted Heat Exchangers KPHE36 and KPHE39 are equipped with two
vertical mounting rails. The KPHE40A has vertical mounting rails plus one top
horizontal mounting rail. Using these rails, the units may be mounted to any avail-
able vertical surface on the enclosure.
Refer to page 5 for location of all mounting holes and cutouts.
Make sure cutouts do not interfere with components inside your cabinet.
Proper alignment of air inlets and outlets is essential for optimum Heat Exchanger
performance
All Kooltronic externally mounted Heat Exchangers are fully gasketed to ensure
proper sealing. This seal is necessary to maintain the integrity of the closed-loop
system.
Use all existing mounting holes to insure stability and a tight seal.
Heated Air
Blower
Water
with
Heat Load
Cold
Water
Heat
Exchanger
Cabinet
Cooled Air
WATER-TO-AIR
A Water-to-Air Heat Exchanger works by transferring heat of internal
air to circulating water, resulting in chilled air which is recirculated
throughout the electronics or electrical cabinet.
