GB390181A - Improvements in absorption refrigerating machines - Google Patents

Abstract

390,181. Refrigerating. S€RNMARK, A. U., Gothenburg, Sweden. July 27, 1931, No. 21458. Convention date, July 28, 1930. [Class 29.] Absorption systems.-In a continuous-cycle system containing a pressure-equalizing auxiliary gas such as hydrogen lighter than the refrigerant and in which the evaporator is at a higher level than the absorber, the evaporation surfaces are substantially vertical and an unobstructed passage is provided for the refrigerant vapours flowing from the evaporator to the absorber so that these vapours flow through the auxiliary gas under the direct action of gravity and without diffusion. The evaporator and absorber may be separate or combined, and the refrigerant may consist of ether, methyl formate, methylene chloride, ethyl bromide, methylol or carbon disulphide, or mixtures of these. Dichlorhydrin or other organic substance may be used as absorbent. The generator may comprise a vessel divided into lower and upper compartments 5, 6 traversed by a flue for gases or by a tube 3 containing an electric heating element 4, and the liquor is raised through a " pumping " coil 9 from the lower to the upper chamber. The condenser 12 may be air or water cooled, and the liquefied refrigerant is delivered to the top of a combined. evaporator-absorber vessel 15 through an annular nozzle 17. The weak liquor after passage through a heat exchanger 23 is cooled in a coil 24 and is delivered through a spray pipe 25 to the lower part of the evaporator-absorber. A tube 18 with flared open ends extends through the evaporator-absorber and serves to prevent diffusion of the gases. The evaporation and absorption surfaces may be roughened, as by sand blasting, or may be covered with a porous material. The vessels mav be of various metals or of glass or quartz, and may be gilled. The Specification as open to inspection under Sect. 91 comprises also the following :- Various forms of gilled and corrugated evaporator and absorber vessels and a #-shaped combined evaporator and absorber are described. The middle part of the combined vessel may serve as a gas heat-exchanger, and the gas and liquor conduits may have throttle valves to control the flow of fluids. Propellers for circulating the gases and liquids in the system may be driven by the condensed refrigerant issuing through the nozzle in the evaporator, or by external or internal electric or magnetic forces, e.g. rotating magnetic fields. Various other organic media as refrigerants and absorbents are mentioned. This subject-matter does not appear in the Specification as accepted.