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EXHAUSTS
Vapor  Compression  Units

Fireman - Navy Firefighter, Fireman training manual
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47.107 Figure 10-17.-Miscellaneous ventilation fans: A. Centrifugal fan. B. Portable axial fan. MECHANICAL COOLING EQUIPMENT Almost  all  working  and  living  spaces  on  newer ships are air conditioned. The equipment used on these ships was carefully tested to see which types would best dehumidify  and  cool  ship  compartments.  Two  basic types of equipment have been found most effective and are  now  in  general  use.  They  are  chilled  water circulating systems and self-contained air conditioners. CHILLED  WATER  CIRCULATING SYSTEMS TWO  basic  types  of  chilled  water  air-conditioning systems are now in use. They are a vapor compression unit and a lithium bromide absorption unit. In the vapor compression unit, the primary refrigerant cools the secondary refrigerant (chilled water) that is used to cool the spaces. This type uses the vapor compression cycle and R-11 or R-114 as the primary refrigerant. The type of primary refrigerant depends on the size and type of compressor.  The  lithium  bromide  unit  operates  on  the absorption  cycle  and  uses  water  as  the  primary refrigerant.  Lithium  bromide  is  used  as  an  absorbent. Vapor  compression  plants  are  used  in  most  ships. However, lithium bromide plants are used in submarines because they require no compression, which means a quieter  operation. 10-19






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