The properties of commonly used refrigerant ammonia (NH3 R717)

Ammonia is an inorganic compound refrigerant. It is one of the oldest refrigerants. It is also one of the medium temperature and medium pressure refrigerants widely used at present. The refrigeration range of ammonia is 5?-70℃, and it is often used for no lower than- In large and medium-sized single-stage or two-stage piston refrigeration compressors at 60°C. In addition: Ammonia can also be used in large-capacity centrifugal refrigeration compressors.

Ammonia has good thermodynamic and thermophysical properties. The critical temperature of ammonia (133.0℃) is high, the freezing point (-77.7℃) is low, and the standard boiling point is 33.3 ℃ At normal temperature, the evaporation pressure of ammonia in the decooling system is 0.1-0.5MPa, therefore, the air is not easy to infiltrate into the system. The condensation pressure of ammonia is generally 1.5-1.6 MPa, and its pressure ratio is moderate.

Because the solubility of ammonia in lubricating oil is very small, it is easy for ammonia to form an oil film on the surface of the pipes and heat exchangers of the refrigeration device, which affects the heat transfer effect of the heat exchange equipment Therefore, an oil separator must be installed in the long ammonia refrigerant device to separate the lubricating oil in the gas and reduce the chance of the lubricating oil entering the condenser and evaporator.

Ammonia has a strong pungent odor, so leakage is easy to find. Ammonia is very soluble in water, and soapy water cannot be used to detect leaks. Use phenolphthalein reagent or test paper to detect leaks by taking advantage of the characteristics of ammonia as an alkaline substance!

Ammonia is easily soluble Compared with water, under normal temperature and pressure, 1 unit volume of water can dissolve 700 unit volume of ammonia water to form an ammonia solution. At low temperatures, water will not precipitate from the ammonia solution and form an ice plug phenomenon. Therefore, a dry filter is generally not installed in the ammonia system. After dissolving water in the ammonia solution, its evaporation temperature will increase slightly, and at the same time it will have a corrosive effect on metals. Therefore, it is stipulated that the allowable water content of ammonia does not exceed 0.2%.

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