Which of the following statement is FALSE about a hermetically sealed compressor?
It is more noisy because of rotating shaft.
Understanding Hermetically Sealed Compressors
A hermetically sealed compressor is a type of compressor used in refrigeration and air conditioning systems where the compressor and the electric motor are sealed together in a single shell. This sealed design offers several advantages, but it also has specific characteristics. The question asks which statement is FALSE about these compressors.
Let's analyze each statement provided:
| Statement | Analysis | Truthfulness |
|---|---|---|
| 1. It is widely used for small capacity refrigeration system. | Hermetically sealed compressors are indeed very common in smaller systems like domestic refrigerators, freezers, and smaller window air conditioning units because of their compact size, reliability, and low maintenance requirements. | TRUE |
| 2. It is more noisy because of rotating shaft. | In a hermetically sealed compressor, the motor and compressor are enclosed within a steel shell. This enclosure actually helps to contain and dampen the noise generated by the rotating parts, including the motor shaft and compressor mechanism. Compared to open-type compressors which may have exposed components and seals, hermetic compressors are generally quieter. The noise isn't typically more because of the rotating shaft; in fact, the sealed design helps reduce the noise transmitted externally. | FALSE |
| 3. It require less space due to compactness. | By integrating the motor and compressor into a single, sealed unit, the overall footprint and volume required for a hermetically sealed compressor are significantly reduced compared to systems where the motor and compressor are separate. This makes them very compact. | TRUE |
| 4. Leakage of refrigerant is completely prevented. | While achieving absolutely zero leakage over the entire lifespan can be challenging for any system, the hermetically sealed design eliminates potential leakage points like the shaft seal found in open-type compressors. The main shell is welded shut, drastically minimizing the possibility of refrigerant escaping compared to other designs. It effectively prevents leakage from the most common points. | TRUE |
Based on the analysis, the statement that is FALSE about a hermetically sealed compressor is "It is more noisy because of rotating shaft." Hermetic compressors are generally known for being quieter due to their sealed construction.
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