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2.1
Designing the panels
2
-3
• Even if the ambient temperature requirement is met, the system must not be installed in such
places where it is exposed to direct sunlight, nearby heat sources, or the elements.
• The ambient temperature must be between 5 and 30
taking into account UPS battery’s operating
temperature requirement of 5-40
and the expected temperature rise of 10
.
2.1.2 Thermal design of the enclosures
The enclosure of a panel must hermetically enclose a CNC or other unit and be so designed
as to keep the internal average temperature rise 10
or less.
Internal average temperature rise
The internal average temperature rise for a sheet metal enclosure can be calculated as fol-
lows:
Note: Effective surface area means the area of an enclosure’s surface that
can dissipate heat
(excluding such a surface as is in contact with another object).
IMPORTANT
ΔT
: Internal temperature rise
(
)
• P
: Internal heat produced (
W
)
• qe
: Enclosure’s thermal transfer ratio
(
W/
)
• k
: Sheet metal’s thermal transfer constant
(
W/m
2
)
With an internal fan
6W m
2
Without internal fan
4W/ m
2
• A
: Enclosure’s effective surface area (m
2
)
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