Calcium chloride (CaCl2) is used only in commercial refrigeration plants. Calcium chloride is used as a simple carrying medium for refrigeration. Brine systems are used in large installations where there is danger of leakage. They are used also where the temperature fluctuates in the space to be refrigerated. Brine is cooled down by the direct …
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Carbon Dioxide Refrigerants
Carbon dioxide (CO2) is a colorless gas at ordinary temperatures. It has a slight odor and an acid taste. Carbon dioxide is nonexplosive and nonflammable. It has a boiling point of 5°F (?15°C). Apressure of over 300 psi is required to keep it from evaporation. To liquefy the gas, a condenser temperature of 80°F (26.6°C) …
Read More…Ammonia Refrigerants
Ammonia (NH3) is used most frequently in large industrial plants. Freezers for packing houses usually employ ammonia as a refrigerant. It is a gas with a very noticeable odor. Even a small leak can be detected with the nose. Its boiling point at normal atmospheric pressure is ?28°F (?33°C). Its freezing point is ?107.86°F (?77.7°C). …
Read More…Methyl Chloride Refrigerants
Methyl chloride (CHP) has a boiling point of ?10.6°F (?23.3°C). It also has heat of vaporization at boiling point (at l atm) of 177.8 Btu/lb. It is a good refrigerant. However, because it will burn under some conditions some cities will not allow it to be used. It is easy to liquefy and has a …
Read More…Sulfur Dioxide Refrigerants
Sulfur dioxide (SO2) is a colorless gas or liquid. It is toxic, with a very pungent odor. When sulfur is burned in air, sulfur dioxide is formed. When sulfur dioxide combines with water it produces sulfuric and sulfurous acids. These acids are very corrosive to metal. They have an adverse effect on most materials. Sulfur …
Read More…Classification of Refrigerants
Refrigerants are classified according to their manner of absorption or extraction of heat from substances to be refrigerated. The classifications can be broken down into class 1, class 2, and class 3. Class 1 refrigerants are used in the standard compression type of refrigeration systems. Class 2 refrigerants are used as immediate cooling agents between …
Read More…HVAC Refrigerants
Refrigerants are used in the process of refrigeration. Refrigeration is a process whereby heat is removed from a substance or a space. A refrigerant is a substance that picks up latent heat when the substance evaporates from a liquid to a gas. This is done at a low temperature and pressure. A refrigerant expels latent …
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