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18
DISTRIBUTION SYSTEM
 
A. AIR DUCTS
 
18A1. Air distribution diagram. The arrangement of the air duets throughout a submarine is shown in Figure 18-1, inserted at the back of the book. The diagram is largely self-explanatory and needs no detailed description.

Note the location of the two air-conditioning coolers, or evaporators, in the crew's quarters and the after machinery compartment. The cooling coils are readily accessible for cleaning. The compressors are located in the pump room.

Part of the system is a suction main that exhausts fumes and used air, and part is a pressure main through which fresh or conditioned air is blown into the compartments. Small arrows on Figure 18-1 indicate the direction of air flow in these ducts;

Dampers, located at most of the inlet and exhaust points of the ducts, are manually set to control the rate of air flow into and out of the rooms at such points.

18A2. Insulation of ducts. The supply air ducts are insulated to prevent heat gain during passage of the newly conditioned air to the rooms. The supply ducts in the engine room and the supply ducts from the discharge side of the forward air-conditioning cooler to the after bulkhead of the forward torpedo room are provided with 1/2-inch insulation. All other mains and branch ducts are cork painted.

  18A3. Fans. Four motor-driven suction fans in the exhaust main, two in the officer's quarters, and two in the crew's messroom, each pull air at the rate of 500 cubic feet per minute. Their main purpose is battery ventilation, but the suction created in the duct is sufficient to provide some degree of exhaust from the galley, scullery, showers, water closets, and other parts of the forward and after battery compartments.

The submarine ventilation supply is provided by one motor-driven fan, located in the forward machinery compartment, that delivers air through the two evaporators, or air-conditioning coolers, to the various room outlets of the ducts at the maximum rate of 4,000 cubic feet per minute. The exhaust ventilation through air ducts is provided by another motor-driven fan located in the forward machinery compartment. This forced exhaust ventilation through ducts is not provided in the after torpedo room and maneuvering room, from which exhaust air flows through bulkhead ventilators. The individual rates at which the air is exhausted and delivered in the various compartments is shown in Figure 18-1.

18A4. Ventilation data. The following table shows, for each room, or compartment, the net volume in cubic feet, the air supplied in cubic feet per minute, and the number of minutes required to change the air in the room.

 
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COMPARTMENT NET VOL.
CU. FT.
AIR SUPPLIED
CFM
MIN. TO
CHANGE
For'd. Torpedo Room 3800 200 19.0
Officers' W.C. in For'd. Torpedo Room 75 100 exh 0.7
Officers' Shower 80 100 exh 0.8
Officers' Quarters 1914 *530 3.5
Control Room 1970 550 3.6
Conning Tower 660 130 5.1
Pump Room 1485
1585
*500 3.0
3.2
Radio Room 351 250 exh 1.4
Dry Stores 340
224
50 6.8
4.5
Crew's Mess Room and Galley 1235 *700 1.8
Main Magazine Compartments 440 50 8.8
Normal Storeroom or Spec. 4-In. Mag. 130 25 5.2
Crew's Quarters 1500 750 2.0
Crew's Washroom 500 200 exh 2.5
Crew's W. C.'s 101 100 exh 1.0
Forward Machinery Compartment 2190 **2685 0.8
Aft Machinery Compartment 2050 *1315 1.5
Maneuvering Room 1695 *1190 1.4
Motor Room 1244 100 12.4
W.C. in Maneuvering Room 70 50 1.4
Aft Torpedo Room 2673 290 9.2

* Includes natural supply from other compartments as well as direct mechanical supply from main.
** Includes 2560 cfm discharge from ship's exhaust ventilator set as well as direct mechanical supply from main.
 
B. OPERATION
 
18B1. Handling of the air duct system. Under various conditions while running on the surface or submerged, it is necessary to set certain main dampers that close, open, or partly close the main air ducts, to open or close the outboard hull valves, and to operate or stop the compressors. In Figure 18-1, the following letters are used to identify and locate these valves and, dampers .(the same letters   are used in the Key and in the Table of Operating Conditions):

1. AMain engine air induction valve
2. BVentilation supply hull valve
3. D and EEngine induction hull valves
4. F and GDampers in the cross-connection between the supply and exhaust blowers
 
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KEY FOR TABLE OF
OPERATING CONDITIONS

A,B,D,E,F,GValves and dampers as indicated on Figure 18-1
YesOperating, referring to air-conditioning unit
NoNot operating, referring to air-conditioning unit
 
OOpen, referring to valves
CClosed, referring to valves
F1, F2Different positions of damper F
G1, G2, G3Different positions of damper G
TABLE OF OPERATING CONDITIONS
NO. CONDITION
OF VESSEL
CONDITION OF
VENTILATION
AIR-CONDITIONING
UNIT OPERATING
POSITION OF
VALVES AND
DAMPERS A,
B, D, E, F, G
1 On surface,
engine stopped
Supply outboard, exhaust outboard via mach. com't. and hatches Yes or No O O C C F1 G1
2 On surface,
engine stopped
Ship's exhaust discharge recirculated to ship's supply suction with additional outside air make-up Yes O O C C F2, G1
3 On surface,
engine stopped
Supply inboard via hatches and mach. comp't. Exhaust outboard via normal supply pipe No O O C C F2 G3
4 On surface,
engine running
Supply outboard, exhaust to engine Yes or No O O O O F1 G1
5 On surface,
engine running
Ship's exhaust discharge recirculated to ship's supply suction with additional outside air make-up Yes O O O O F2 G1
6 Submerged Recirculation without air-conditioning No C C C C F2 G2
7 Submerged Recirculation with air-conditioning Yes C C C C F2 G2
 
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Version 1.10, 22 Oct 04