Refrigerant Physical Properties

Several important physical properties of the refrigerants studied in this chapter are listed in Table 12.4. Some of these properties reinforce the distinction between low-temperature and moderate-temperature refrigerants that is apparent from the saturation pressures shown in Figure 12.5. The freezing temperatures of all the refrigerants shown are adequately low for operating temperatures down to -100°C (-148°F), with the exception of ammonia and carbon dioxide. Table 12.4 does not show freezing temperatures for the azeotropes, because they have no precise freezing point.

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