Mechanical Refrigeration

Mechanical systems may use reciprocating, screw, twin screw, or centrifugal compressors to move the refrigerant from the low-to-high pressure operating conditions. Some units up to 1,100–2,500 tons may be a compact “unitized” assembly of the compressor, condenser, piping, and controls. See Figures 17-26A, 17-26B, 17-26C and 17-26D. The hermetically sealed, centrifugal or reciprocating compressor has the compressing system and drive seal in a single case or housing. This eliminates the shaft seal and some lubricating problems. For special and large installations, the same basic equipment is involved, but the size and/or conditions require that the equipment be arranged separately.
Figure 17-27 is a schematic flow diagram ...

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