Figure 14-7.An expendable spray system.
Figure 14-8.Cascade refrigeration system.
condenser B of system 1 is being cooled by evapor-
ator C of system 2. This arrangement enables
ultralow temperatures in evaporator A of system
The compound system uses two or more com-
1. The condenser of system 2 is shown at point
pressers connected in series in the same refrigera-
D in the figure. Two TEV refrigerant controls are
tion system. In this type of system the first stage
also indicated in the figure. Notice the use of oil
compressor is the largest and for each succeeding
separators to minimize the circulation of oil.
stage the compressor gets smaller. This is because