GB1043326A - Double effect absorption refrigeration machine - Google Patents

Abstract

1,043,326. Refrigerating. AMERICAN RADIATOR & STANDARD SANITARY CORPORATION. April 3, 1965, No. 14214/65. Heading F4H. In an absorption refrigeration system having first and second stage generators 24 and 12, respectively, the former comprises a direct fired, horizontally disposed tube-and-shell heat exchanger having fire tubes 70 and 26. Vapour generated in 24 passes via line 28 to and through tubes 30 in the second stage generator 12 while solution from 24 passes via overflow device 69, line 32, heat-exchanger 29 and line 34 to a drip device 112 positioned above tubes 30. Solution dripping over the tubes 30 is heated thereby to release refrigerant vapour which is condensed on condenser tubes 40 and the refrigerant in tubes 30 is condensed, discharges to a header chamber and then passes through an orifice 106 to a further header chamber 36. Any flashed refrigerant vapour so produced is returned to the shell 38 containing generator 12 and the condenser for condensation on tubes 40 and the liquid refrigerant from chamber 36 passes through line 119 to join refrigerant from condenser trough 42, the combined stream being passed through a restriction (not shown), a drum 44 and line 136 to a distribution device 140, 144 positioned above the evaporator. Absorbentrich solution from shell 38 passes via line 56, heat-exchanger 58 and line 60 to a distribution device 160, 162 positioned above the absorber tubes 54. Non-evaporated refrigerant from the evaporator is collected in trough 50 and recirculated to drum 44 by pump 53 while refrigerant-rich solution is withdrawn from the bottom of the shell 120 containing the evaporator and absorber by a pump 166. Part of said solution is returned to the first stage generator via line 63, heat exchangers 58 and 29, line 64, chamber 65 and line 20 and the remainder is recirculated to the absorber through line 168 under the control of a valve 170 which is modulated in accordance with the outlet temperature of the medium to be cooled. This temperature may simultaneously be used to determine the rate of fuel supply to the burner of generator 24. Chamber 65 is connected to the upper part of generator shell 24 through line 67 to equalize the pressures therein and to ensure that on shut-down of the machine solution remains in generator 24 by virtue of the liquid trap formed by line 20. A spray eliminator 80 having perforated inclined walls 84 is provided at the inlet to line 28 and a further eliminator 94 (Fig. 2, not shown) is provided in the inlet header for tubes 30.