Patent GB-285798-A (GB)
Title: Improvements in absorption refrigerating machines
IPC: F25B17/08
Filed: 1928-02-20
Abstract: 285,798. Normelli, W. B. Feb. 18, 1927, [Convention date]. Refrigerating, absorption systems for.-A machine working on the reversing system comprises a generator-absorber 1 disposed in an insulated chamber 5 and having a solid absorbent, such as fused calcium chloride poured on iron wool, packed between the ribs on a tube 3 containing- an electric heater 2 controlled by a thermostat 18. The evaporator 11 is arranged in an insulated compartment of a refrigerator 13, and the generator-absorber and the condenser 9 are cooled by a natural draught of air through a space 16. The flow of air is controlled by dampers 6, 7 regulated by a hand-rod 17 which also regulates the dampers 15 controlling the circulation of air between the storage space and the evaporator compartments. Ammonia or amines may be employed as refrigerants and haloid compounds of earth alkalis or of magnesium, zinc, cadmium, manganese, cobalt, nickel and lead as absorbents. The Specification as open to inspection under Sect. 91 (3 (a) comprises also the following.-A generator absorber, Fig. 1 (Cancelled) is provided with spaced plates 2 surrounding an electric heater 4 and packed with iron chips coated with magnesium chloride ard saturated with ammonia. The evaporator, with which the generatorabsorber is connected by a pipe 5, is packed with ammonium chloride and contains a coil 7 through which circulates the brine from a tank 10 in the cooling-chamber. The ammonia evolved in the generator-absorber combines with the ammonium chloride in the evaporator and the heat of combustion is dissipated by air passing upwardly through the evaporator chamber. When the temperature reaches a predetermined maximum value, a thermostat 15 cuts out the heater and a current of cold air is passed upwardly through the generator-absorber chamber, the flow of air through the evaporator chamber being cut off. The consequent reduction in the pressure in the apparatus effects the disassociation of the ammonium chloride and the ammonia in the evaporator and the absorption of the ammonia in the generator-absorber, the heat being abstracted from the brine flowing through the coil 7. Fig. 3 (Cancelled) shows apparatus using a solution of ammonia in water, the vapour being generated in the depending tubular portion of the generator surrounding the electric heater 2. The condenser 9 is air cooled and brine from the tank 20 circulates through a jacket 17 of the evaporator 21. During generation a circulation of the weakened liquor in the generator takes place through a tube 6 and air-cooled pipes 7 to the collecting and absorbing vessel 5 and through the pipes 3 back to the generator. The tubes 3, 6 both pass through a port exchanger 4. When the temperature in the generator reaches a predetermined maximum value the heater is cut out and absorption commences, the vapour returning through the pipe 12 to the vessel 5 and liquor through the pipe 3 to the generator. Water accumulating in the bottom of the evaporator is returned through the pipes 14, vessel 15 and pipe coil 16 to the generator. This subject-matter does not appear in the Specification as accepted.