What is the pressure reading at 55 degrees Fahrenheit?

To determine the pressure reading at 55 degrees Fahrenheit within the context of refrigeration systems, it is essential to refer to the pressure-temperature relationship for refrigerants, typically using a pressure-temperature chart relevant to the specific refrigerant in question.

In this case, the pressure reading at 55 degrees Fahrenheit corresponds to the saturated vapor pressure of that refrigerant. Checking the pressure-temperature chart typically reveals that at this specific temperature, the appropriate saturation pressure is measured in inches of mercury (hg).

For many commonly used refrigerants, the saturation pressure correlating with 55 degrees Fahrenheit aligns closely with the values provided. Analyzing typical refrigerant properties shows that 17.0 inches of mercury is the most accurate reading, indicating it is the saturation pressure at that temperature. This means that at 55°F, the refrigerant would be in equilibrium between the liquid and vapor phases at this pressure, making the chosen option the correct one.

Understanding the saturation pressures at various temperatures is crucial for operators since it directly impacts system performance and efficiency. Therefore, utilizing tools like pressure-temperature charts or tables is vital for accurate diagnostic and operational tasks in industrial refrigeration.