GB713147A - Improvements in or relating to absorption refrigerating apparatus - Google Patents

Abstract

713,147. Refrigerating. ELECTROLUX, Ltd. Sept. 18, 1952 [Sept. 22, 1951; Sept. 22, 1951], No. 23442/52. Class 29 In continuous cycle absorption refrigerating apparatus of the inert gas type having a boiler system comprising a heating tube; a boiler tube and a pump tube, and a liquid heat - exchanger all enclosed in a common body of heat insulation, one of the streams of liquid flowing through the liquid heat-exchanger receives waste heat from the boiler system at a zone outside the liquid heat-exchanger before said stream has completed its passage through the heat-exchanger. The solution entering the pump has. therefore an increased temperature. As shown in Fig. 1, the pipe connecting the absorber vessel 12 to the liquid heat-exchanger 16 is welded at 26 to the lower part of heating tube 10 so that the strong solution is preheated. The welding may be along a common generatrix as shown or peripheral. Pipe 17 carrying weak solution from the liquid heatexchanger to the top of the absorber 18 is provided with cooling fins 37 outside the boiler insulation. As shown in Fig. 3, the boiler system is of the type wherein the pump 14 raises weak solution from the bottom of the boiler pipe 11 to a stand-pipe 42. From the stand-pipe 42, weak solution flows through the first part 33 of the liquid heat-exchanger and then flows upwardly through a pipe 46 welded either along a common generatrix as shown or helically to that part 43 of the boiler 11 in which vapour exists so as to be heated. It then flows down a pipe 44 similarly welded to the heating tube 10, this being further heated. The expelled vapours are rectified in the part 43 of boiler 11. It then flows through the second part 34 of the liquid heat-exchanger. It may traverse the pipe 44 before the pipe 46. The part 33 of the liquid heat-exchanger may be omitted. Any gases formed in the liquid heat-exchanger and the pipes 44, 46 are vented to the vapour space of the boiler by a pipe 36. In a modification (Fig. 2, not shown) the pump circulates strong solution, and weak solution from the boiler flows through a first part of the liquid heat-exchanger, an inverted U-tube one or both limbs of which are welded to the heating tube and the second part of the liquid heat-exchanger. If a flame is used as the heat source, the first part of the heat-exchanger is omitted. As shown in Fig. 4, weak solution from the first part 33 of the heat-exchanger is led by a pipe 44 to a jacket 50 surrounding, the vapour space of boiler 11 and vented thereto at 52. The vapour space of boiler 11 may have internal surface-enlarging members. Heated solution then passes to the second part 34 of the heat-exchanger by pipe 46. Vapours expelled in the pump 14 are led from the top of stand pipe 42 through pipe 55 to enter the boiler 11 below the liquid level so that they are analyzed. The jacket 50 rectifies the vapours.