Evaporation is effected by a steadily maintained low pressure and a ‘high side” where the reclamation of the refrigerant in a liquid state is achieved under the influence of high pressure and heat.
Ammonia gas coming out of the boiler is passed through the rectifier or water separator which is provided between the boiler and the condenser so as to prevent the entry of any water vapour into the evaporator where it would freeze and stroke the machine, After this the gas is liquefied in the condenser from where it gravitas to a U-tube gas seal containing liquid ammonia (which prevents the entry of hydrogen in the condenser) and then enters the evaporator. The whole plant is charged to a pressure of about 14 Kgf/cm2.
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