Patent GB-431266-A (GB)
Title: Improvements in or relating to absorption refrigerating apparatus
IPC: F25B17/00
Filed: 1933-12-29
Abstract: 431,266. Refrigerating. ELECTROLUX, Ltd., 153, Regent Street, London.-(Assignees of Platen-Munters Refrigerating System Aktiebolag ; 2, Norrmalmstorg, Stockholm) Dec. 29, 1933, No. 36590. Convention date, Jan. 5. [Class 29] Absorption systems.-In systems in which a period of generation and condensation alternates with a period of evaporation and absorption, continuously cooled vessels for storage and absorption of the liquor separate from the generator are provided, and during the generating period the greater part of the liquor is stored in a cooled condition, and is circulated through a generator of small capacity. The heat supply to the generator is cut off during the ensuing evaporation and absorption period, and the returning vapour enters a small bore conduit in the absorption and storage system to effect a circulation of the liquor. The generator side of the system is separated by liquid seals from the evaporator side. The system shown comprises a generator 13 in heat conducting connection with a heated flue 31 and enclosed in insulation 30, a vapour expulsion pipe 16, an analyzer 34, a rectifier 36, a liquid seal device 41, a condenser 14, a refrigerant receiver 43 and evaporator 45, absorption and storage vessels 11<a>, 11<b> with flanges 33 for continuous cooling by air, and a liquor heat exchanger 12 enclosed in insulation 32. A " pumping coil 13<a> surrounds the hottest part of the generator flue, and a heat insulated liquor reservoir 21 is connected between the absorber vessel 11<a> and the vapour expulsion pipe. During the generating period the conduit 16 and vessel 21 are under expulsion pressure, and this is transmitted through a connecting pipe 49 to the storage vessels 11<a>, 11<b>, and through the rectifier 36, conduit 40, liquid seal 41 and conduit 18 to the condenser 14 and the refrigerant storage vessel 43. The liquid seal vessel 41 is connected by a pipe 42 to a pipe 11<d> connecting the vessels 11<a>, 11<b>, which are also connected by a pipe 11<c>. At the beginning of the generating period the lower parts of the system are filled with solution to the level I, and during this period the liquid column in pipe 42 prevents passage of vapour to the absorber. The seal 41 is supplied in part from the liquid in conduit 42 and in part from the liquid separated in the rectifier 36, which is connected thereto by two pipes 39, 40 opening at different levels. The strong solution passes from the storage vessel 11<b> through a pipe 19 to the " pumping " coil, and weak solution returns from the generator through a pipe 20 to the upper vessel 11<a>. At the end of the heating period the liquid is at the level II. When the heat supply is cut off, as by a thermostat or other automatic means, the liquid retained on the plates of the analyzer and rectifier, which are always cooled, absorb the refrigerant vapour in conduit 16, and a rapid pressure reduction takes place there. Liquid columns form in the pipes 39, 40 above the seal 41, and the level rises in the vessel 21. The pipe 42 opens to flow of vapour from the evaporator, and this vapour enters the conduit 11<d> and exerts a circulating action on the liquor to lift it from the lower vessel 11<b> to the upper vessel 11<a>, where absorption takes place. During this time there is no circulation of liquor through the generator. The vessels 11<a>, 11<b> are in spaced vertical planes so as to be subject to separate air streams. The vessel 21 may be connected to any part of the expulsion pipe, and may be heated by conduction from the conduit 16 or otherwise. The evaporator may have means for draining solvent therefrom, such as a U-tube 46 connected to a vessel 47 and drain pipe 48, and may be filled in part with a light auxiliary liquid which is displaced upwardly into the vessel 43 by accumulation of condensed refrigerant during the generating period, in known manner. The two cooled vessels 11<a>, 11<b> may be replaced by a single vessel with apertured partitions, or by a tubular coil of sufficiently small diameter to prevent mixing of solutions of different strengths. Specifications 431,267, 431,268, and 431,316, are referred to. The Specification, as open to inspection under Sect. 91, comprises also the use of the combined storage and absorption vessels in continuous-cycle systems. This subject-matter does not appear in the Specification as accepted.