what is Two Stage System refrigeration system

Refrigeration systems utilizing one, two, three, or four stages of compression have been

successfully operated in various services. The number of levels of refrigeration generally

depends upon the number of compression stages required, inter stage heat loads,

economics, and the type of compression.

i. One-Stage System

A typical one-stage refrigeration system is shown in Fig. 7 where the data are for pure

propane refrigerant.

Two-Stage System 

A two-stage refrigeration system and inter stage flash economizer can savings in the range 

20%. Also removing process heat at the inter stage level rather than at the low stage level. 

A typical two-stage system with an intermediate load is shown in Fig. 8 with data for pure 

propane.