PRINCIPLES OF NAVAL ENGINEERING 



THERMOSTATIC SWITCH 



L.P. R'12 LIQUID- 



Figure 19-15.— Refrigerant circulating type of mechanical cooling system. 



47.109 



ducts leading to the spaces to be cooled. The 

 refrigerant used in this system is usually R-12. 



Chilled Water Circulating Systems 



Two types of chilled water circulating sys- 

 tems are used for mechanical cooling aboard 



ship. Both systems utilize chilled water as the 

 secondary refrigerant, but one type uses R-12 

 as the primary refrigerant and the other uses 

 R-11. R-12 systems use reciprocating com- 

 pressors; R-11 systems use centrifugal com- 

 pressors. 



488 



i 



