What type of refrigeration system is characterized by a sealed motor and compressor within the same system with refrigerant?

A hermetic refrigeration system is designed with both the motor and compressor sealed within a single unit, which contains the refrigerant. This configuration eliminates any possibility of refrigerant leakage, as the entire assembly is welded shut and not intended to be opened for maintenance or repair. The hermetic design is beneficial for reducing the risk of contamination from external environmental elements and ensuring operational efficiency.

In a hermetic system, the compressor is specifically designed to run efficiently while completely sealed. This reduces noise and vibrations compared to non-hermetic systems, and it allows for a compact design that is often used in refrigeration applications like domestic refrigerators and small commercial systems.

Other types of systems, such as open systems, involve components that are not sealed together and may have exposure to the environment. Closed systems do include sealed components but do not necessarily have the motor and compressor integrated in a hermetic manner. Vented systems allow air exchange, which does not apply to the concept of refrigeration hermetically sealed from the surrounding atmosphere. Thus, the characteristics of a hermetic system distinctly align with the definition given in the question.