Which of the following temperatures is indicative of the high stage compressor suction temperature in a two-stage system?

The high stage compressor suction temperature in a two-stage refrigeration system is typically higher than the temperatures seen in the low stage system because it deals with a compressed refrigerant that is being expanded for further cooling. In a well-designed two-stage system, the suction temperature of the high stage compressor is often in a range that accommodates efficient operation and prevents flooding or liquid slugging issues at the compressor inlet.

In this context, a suction temperature of 24°F is the standard desired temperature for the high stage compressor in many two-stage systems. This temperature balances the need for sufficient vaporization of the refrigerant while ensuring efficient compressor performance. Temperatures significantly below this could indicate potential issues within the system, such as too much heat being absorbed from the source or too much of the refrigerant not vaporizing properly, leading to inefficiency.

Other temperatures listed—22°F, 26°F, and 28°F—may not align with the optimal efficiency or operational parameters expected within a two-stage compression system. Since they fall outside the typical desired range, they may imply potential operational concerns or performance issues. Therefore, 24°F serves as a representative and effective target suction temperature for the high stage compressor, ensuring that the system operates reliably, efficiently, and safely.