According to Joe's pressure-temperature chart, the saturation temperature for 12 lb of pressure is 36.9 degrees Fahrenheit. The actual refrigerant temperature measured was 35.2 degrees Fahrenheit. What does this tell you about the refrigerant?

The refrigerant's observed temperature is lower than its saturation temperature at 12 lb of pressure, indicating it's subcooled. This condition increases a cooling system's operational efficiency.

Explanation:

The observed temperature of the refrigerant at 35.2 degrees Fahrenheit, which is lower than the saturation temperature for 12 lb of pressure (36.9 degrees Fahrenheit) reveals the refrigerant is subcooled. In refrigeration and HVAC contexts, subcooling refers to a liquid refrigerant condition where the temperature of the refrigerant is lowered below its saturation temperature. The reason for subcooling refrigerant is to increase the operational efficiency of the cooling system.

In line with the Clausius-Clapeyron equation and the fact that pressure and temperature are directly proportional (as shown in FIGURE 9.11 and 8.11), the refrigerant temperature should, ideally, correspond to the saturation temperature at a given pressure. Any variance could indicate the efficiency of the system.

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