What type of equipment uses refrigerant that boils between -58 and 50 F at atmospheric pressure?

The correct answer is that refrigerant which boils between -58 and 50°F at atmospheric pressure is typically associated with medium pressure systems. Medium pressure refrigerants are characterized by their boiling points falling within this range, making them suitable for various applications that require a balance between efficiency and functionality at these particular temperature levels.

Low pressure systems usually operate with refrigerants that have much lower boiling points, often below -58°F, while high pressure systems work with refrigerants that boil at much higher temperatures. Vacuum pressure systems operate below atmospheric pressure and are not applicable in this scenario because they deal with pressures less than atmospheric, which typically involves lower boiling points suited for specific applications.

Understanding the correct pressure type is crucial in refrigeration as it directly impacts system design, efficiency, and safe operation. Thus, identifying the right refrigerant boiling point range helps in selecting the proper equipment for specific refrigeration needs.