Commonly used refrigerants ammonia ( NH3 R717) The nature of the _

Ammonia refrigerants, belonging to inorganic compounds is one of the oldest refrigerant, is currently one of the widely used as refrigerant temperature in medium voltage, ammonia refrigeration range is 5? - 70 ℃, and often for no less than. . . 60 ℃ medium and large in single stage or two stage piston compressor. In addition: ammonia can also be used garlic street in large capacity centrifugal te refrigeration compressor. Ammonia has good thermodynamic properties and thermal physical properties, critical temperature of ammonia ( 133. 0℃） High freezing point ( - 77. 7℃) Low, standard boiling point is 33. 3 ℃ at room temperature, evaporation of ammonia in the cooling system pressure is zero. 1 - - 0. 5 mpa, therefore, air permeability are not easily in the system. Ammonia condensing pressure generally to 1. 5 - - 1. 6 mpa, the pressure ratio is moderate. Due to ammonia solubility in the lubricating oil is very small, so easy to ammonia in the refrigeration unit pipeline and oil film is formed on the surface of heat exchanger, heat transfer effect, influence heat exchange equipment so long in the ammonia refrigerant device must set up the oil separator, so that the lubricating oil into sleep in the gas separation, reduce oil class into the condenser and evaporator and other equipment. Ammonia has a strong pungent odor, therefore reveal that easy to find. Ammonia is easily soluble in water, can't use soap water leak detection, can use the characteristics of ammonia as alkaline substances, to leak detection with phenolphthalein reagent or test paper! Soluble in water, ammonia under atmospheric pressure, 1 per unit volume of water can dissolve 700 per unit volume of ammonia and ammonia solution. At low temperatures, water will not from ammonia liquid precipitation and form ice jam phenomenon, therefore in the ammonia system generally does not set the filter drier. After water soluble in liquid ammonia, the evaporating temperature increased slightly, at the same time have a corrosion effect on metal, so the rules allow of ammonia water content is less than 0. 2%.

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