GB595938A - Improvements in or relating to absorption refrigerating apparatus - Google Patents

Abstract

595,938. Refrigerating. AKTIEBOLAGET ELEKTROLUX. July 10, 1945, No. 17570. Convention date, Aug. 3, 1944. [Class 29] Absorption systems.-Two or more individual streams of absorption solution of different concentrations are used in continuous cycle inert gas systems, each stream having a separate circulating pump and boiler. The main boiler 11 is surrounded by an auxiliary boiler 12 operating at a lower temperature, and weak liquor from the main boiler passes by pipe 32, a triple liquid and boiler vapour heat-exchanger 21 and pipe 31 to the top of the .absorber 30. A baffle 46 in the middle part of the absorber tube causes the enriched liquor to pass by a pipe 33 to an absorber vessel 34 whence it returns to the main boiler through triple heat-exchanger 21, 'pipe 35 and gas bubble pump 36. Relatively rich solution from the auxiliary boiler 12 passes by pipe 42, a second liquid heat-exchanger 41 and pipe 40 to the middle part of the absorber and returns through a pipe 39, vessel 37, liquid heatexchanger 41 and a second gas bubble pump 38 to the auxiliary boiler. Rich inert gas rising through the absorber from the gas heat-exchanger 26 thus contacts first the relatively rich solution flowing through the lower part of the absorber, and the weaker gas contacts the weak solution entering the top of the absorber by the pipe 31. The weak gas passes through gas heatexchanger 26 and pipe 27 to a second gas heatexchanger 25 where it is pre-cooled before entering the low temperature evaporator 24. From the evaporator 24 the gas passes through the gas heat-exchanger 25 to the high temperature evaporator 17 and thence by pipe 28 and gas heatexchanger 26 to the lower part of the absorber. Refrigerant vapour from the main boiler 11 passes by pipe 20, triple heat-exchanger 21 and pipe 19 to condenser 23 supplying the low temperature evaporator 24. Vapour from the auxiliary boiler 12 passes by pipe 13 and rectifier 14 to condenser 15 supplying the high temperature evaporator 17 through a pipe 16. Condensate formed in the vapour passage of the triple heat-exchanger is drained by a pipe 49 to the gas bubble pump 38. A pipe 47 connects the inner conduit of the triple-exchanger 21 with the vapour space of the main boiler 11.