GB379391A - Improvements in or relating to the operation of absorption refrigerating apparatus - Google Patents

Abstract

379,391. Heating by induction. ELECTROLUX, Ltd., 153, Regent Street, London.-(Assignees of Munters, A. J. E ; Stockholm.) June 1, 1931, No. 15975. Convention date, May 31, 1930. [Class 39 (iii).] The heat resulting from eddy currents set up by an external rotating magnetic field which effects a circulation of liquid within absorption refrigerating apparatus is utilized for heating the media within the apparatus, particularly the solution in the generator. For the gas circulation the liquid set in motion serves as an inducing medium for the gas through ejector nozzles. A continuous-cycle refrigerating system, Fig. 1, containing an inert gas not lighter than the refrigerant and comprising the usual generator K, condenser C, evaporator G, absorber A, and liquor heat exchanger T is provided with a device Cv for the liquid circulation between generator and absorber and a device Cg for gas circulation between absorber and evaporator. The device Cv comprises a laminated iron cylinder 1, recessed to hold winding coils 3, 4, 5 connected to a three-phase current source, located around a non-magnetic electrically conducting wall 6 of the generator. A cylindrical body 7 of laminated iron is arranged in the liquid and facilitates the formation of a strong magnetic field. The liquid is set in motion so that it is raised from the level of the strong liquor inlet pipe 18 to the point at which the weak liquor flow pipe 19 opens from the top of the generator, and is also heated wholly or in part by the eddy currents set up in the liquid and in the metal wall. The device Cg contains an electrolytic liquid or a liquid metal, the movement of which induces a flow of gas from the absorber by way of the pipe 11, terminating in inducing nozzles 12, Fig. 4, and through the pipe 13 to the evaporator. Where an electrolyte is used chromium or other rustpreventing salts may be added thereto. Another arrangement is shown in Fig. 2 for a system having no inert gas. The device Cv is applied to a coiled part 6 of the strong liquor pipe, parts of which may be interconnected by electrical conductors so that current of a strength suitable for heating may be set up in the material of the pipe. A floating or pivoted conductive solid body provided with vanes or the like may be mounted in a poorconducting liquid so as to be set in rotation by the magnetic field. The liquid and gas circulating means may be combined in one element.