GB519141A - Improvements in or relating to absorption refrigerating apparatus - Google Patents

Abstract

519,141. Refrigerating. ELECTROLUX, Ltd. Sept. 29, 1938, No. 28363. Convention date, Sept. 30, 1937. [Class 29] Absorption system.- In a continuous-cycle inert-gas system a part of the liquefied refrigerant is periodically accumulated out of circulation in a store and then suddenly discharged to the inert gas system to stop evaporation for a defrosting period, or to a sump in the evaporator to displace solvent liquid therefrom, or to the rectifier or other part to effect replenishment of liquid therein with anti-corrosion media. Condensate from the part 15, Fig. 1, of a double condenser 16, 15 flows at 80 into a U-tube 81 and accumulates slowly until it overflows as a stream down a small' bore tube 82 into a larger bore tube 84 connected to the poor inert gas conduit 51 from the absorber 12 to the usual gas heat exchanger 26. The refrigerant evaporates and changes the density. of the gas in conduit 51 so that gas circulation to, and evaporation in, the evaporator ceases. Warm refrigerant vapour may find its way into the evaporator and effect defrosting. The liquid seal in the U-tube 81 reforms and refrigerant in a store 40 in the low temperature part 18 of the evaporator is available for immediate production of cold. The U-tube seal and store may be supplied from'a separate condenser below the double condenser 15, 16. In a modification shown in Fig. 2 liquefied refrigerant flows into a conduit 90, 91, 94, 95 from the usual conduit 31 which supplies the evaporator at 37. The part 91 of the, conduit receives heat at 92 by metallic conduction or otherwise from the hot expulsion pipe 14 of the generator 10, and refrigerant is vaporized therein and recondensed in the part 94 of the conduit, finally overflowing the part 95 into the conduit 84. The heat transfer at the point 92 may be varied as by an air gap closable by a removable metal plug &c. and may be such that a period of several hours or days may be necessary to prime the overflow 95. The condensate from the overflow may be ted to a hot part of the apparatus and the evaporation be utilized to lift or displace solution rich in anti-corrosive medium to any desired part. According to another arrangement the evaporator store 40 may be connected with the overflow and the refrigerant be led therefrom to an auxiliary boiler, the hot vapour from this boiler being led to the evaporator to defrost it, until the auxiliary boiler is empty.