Chapter hvac engineering Fundamentals: Part 1 Introduction

9.3.5
Hermetic compressors
Compressors may be built in either hermetic or open configurations.
A hermetic unit has a casing which encloses both the compressor and
the drive motor, minimizing the possibility of refrigerant leakage. Mo-
tors are specially constructed and are normally cooled with suction
gas or with liquid refrigerant. In an open machine, the drive motor or
turbine is separate from the compressor. Shaft seals must be provided
to prevent refrigerant leakage. Standard drives—direct, gear, or
Equipment: Part 1
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