Patent GB-505174-A (GB)
Title: Improvements in or relating to refrigerating systems
IPC: F25B15/10
Filed: 1937-10-27
Abstract: 505,174. Refrigerating. ELECTROLUX, Ltd. Oct. 27, 1937, No. 29344. Convention date, Oct. 27, 1936. [Classes 29 and 64 (iii)] Absorption systems.-In the absorber or evaporator of a continuous-cycle inert gas system an annular path of flow for gas between parallel cylindrical walls is provided, and a member for conducting liquid through the gas is arranged midway between the walls. The liquefied refrigerant in the evaporator 12, Fig. 1, is distributed from a tray 42 by a wire mesh wick 43 in a single path of flow over the surface of a coil 41 conveying brine or other liquid to be cooled, the turns of the coil being sloped to the horizontal at an angle of between 2 and 8 degrees, and preferably 4 degrees, whereby the liquid continues to flow over the coil in an unbroken stream, while the inert gas, admitted through a conduit 57 and a hollow core member 38, flows from the top downwards on both sides of the coil. The surface of the coil may be roughened, as by electrodeposition of metal thereon. The coil is spaced from the core and the outer shell by a distance not less than #th of an inch to prevent the liquid from bridging the gaps, while the distance is kept as ' low as possible to promote diffusion of the vapour into the gas. The absorber is similarly constructed. In a complete system, shown in Fig. 2, a generator 16 has flue tubes 17 over a burner 19, and a " pumping " coil 20 connected to a separating chamber 23 whence weak liquor flows by a pipe 60, 61 to the absorber 13. The evolved refrigerant vapour flows through a conduit 25 fitted with apertured analyzer baffles 26 to a vessel 29 supplied with strong liquor from the absorber, and after bubbling through the liquor passes through a watercooled rectifier 75 and a second rectifier 33, cooled by evaporating refrigerant, to the condenser 11. The condensate flows into a U- trap 36, which supplies the rectifier jacket, and then through a pipe 67 and a precooler or high - temperature evaporator 64 into the evaporator proper 12. The precooler is connected by pipes 66, 65 with the rich gas space of the gas heat exchanger 15, whereby evaporation of some refrigerant takes place to precool the remainder-and also it may be to effect external cooling. A hollow core member 45 in the absorber is connected at its upper end by a pipe 49 with the top of the U-trap and opens at its lower end into the gas space of the absorber. Uncondensed gases pass through it into the gas circuit, or, where normal condensation fails at high cooling water temperatures, a pressure builds up on the absorber side and raises the total pressure to restore condensing conditions. The brine cooled in the evaporator coil is circulated by a pump 57 through a coil 69 in a chamber to be cooled. The cooling-water of the absorber may be recooled in a spray tower, Fig. 5 (not shown) in which the condenser is located. Make-up water is supplied by a float valve and the water is circulated by a pump, while a draught of air is produced by a fan. The brine cooled in the evaporator may be sprayed into a chamber to cool air circulated by a fan through a room &c. The inert gas may be circulated by a fan &c., and banks of tubes or a cylindrical member of capillary material may be used in place of the helical coil as a liquid flow surface in the evaporator and absorber. The Specification as open to inspection under Sect. 91 comprises also the following: A system as above, may be assembled within an angle-iron framework 209, Fig. 6 (Cancelled), the generator 216, liquor heat exchanger 214, analyzer 225 and separator 223 being enclosed in insulation such as mineral wool in a metal casing, and the evaporator 212 similarly insulated. This subject-matter does not appear in the Specification as accepted.