MIL-PRF-2939G
3.13 Cooling coils. Duct mounted type.
3.13.1
General design.
The cooling coils supplied under this specification shall use chilled water for
the cooling and dehumidification of air. The cooling coils shall be built as a
single unit consisting of supporting framework, drain pan, and cooling element.
Each cooling coil shall be ready for installation and connection to the
appropriate water supply and return lines and condensate drainage piping. The
following drawings define cooling coil interfaces and principal dimensions for
replaceability and may be used for guidance. NAVSEA drawings 803-6397313 -
Cooling coils, air, class I, duct-mounted, chilled water, sizes 61 through 66
and 803-6397314 - Cooling coils, air, class I, duct mounted, chilled water,
sizes 67 and 68.
3.13.2
Sizes. Sizes of cooling coils shall be limited to those listed in
table I.
TABLE I.
Chilled Water Cooling Coil Capacities (Nominal).
3
Coil Size
Airflow ft /min
Leaving air
Capacity MBH
Velocity (ft/min)
temperatures in
DB/WB
61
280
(491)
58.6/56.8
9.02
62
450
(500)
56.9/55.3
16.47
63
670
(496)
55.3/53.8
27.26
64
975
(488)
55.2/53.7
39.97
65
1450
(485)
53.1/52.5
63.44
66
2500
(500)
52.7/52.1
112.20
67
3800
(507)
51.1/50.8
183.60
68
5000
(500)
51.1/50.9
240.70
The cooling coils shall perform in the total range specified in appendix A.
For test purposes, cooling coils are tested either in accordance with table I
or for conditions from appendix A as specified by contracting activity (See
6.2).
3.13.3
Capacity. The capacity of the chilled water cooling coils shall be
not less
than the capacities listed in table I for the following conditions:
water temperature equals 45°F, leaving water temperature equals
entering
51.67°F,
gallons per minute (gal/min) per ton of cooling equals 3.6, and
air temperature equals 80°F dry bulb (DB) 67°F wet bulb (WB). Capacity
entering
shall be
based on counter flow of water and air streams.
Performance Range. The performance range of the cooling coil shall
3.13.4
be in accordance with table II. In lieu of the conditions specified in table
I, the contracting activity may substitute the conditions in appendix A (see
6.2). In the performance range stated in table II and the Nominal Capacity in
table I the air pressure drop in inches of water for the air passing through
the coil shall be in accordance with figures 1 and 2. The water pressure drop
in feet of water of the cooling water passing through the coil shall be in
accordance with figures 3 and 4.
3.13.5
Physical dimensions. Mounting dimensions, duct connection
7
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