GB706533A - Improvements in or relating to absorption refrigerating apparatus of the inert gas type - Google Patents

Abstract

706,533. Refrigerating. ELECTROLUX, Ltd. April 18, 1952 [April 26, 1951; April 3, 1952], No. 9774/52. Class 29 Refrigerant withdrawn from the normal circulation in continuous cycle inert gas absorption apparatus is accumulated in a vessel 26 with a liquid space in communication with a vessel containing absorption solution e.g. the absorber vessel 27, and is returned bodily into circulation by utilising variations in the distribution of absorption solution caused by external control means e.g. the usual thermostat regulating the heat supply to the boiler system ofa manual control. As shown the absorber vessel 18 is divided by a partition 24, having an opening 28 in its upper part, into the absorber vessel 27 and the accumulator vessel 26 to which unevaporated refrigerant from the evaporator 15 is supplied through the inert gas pipe 19. A pipe 30 opening above the .base of the vessel 26 is connected to the rich liquor pipe 22 to form the liquid connection between the two vessels. During normal operation tne concentration of refrigerant in the two chambers 26, 27 is substantially equal. Upon rise of temperature of the air cooling the condenser 14 and absorber 17 evaporation in the evaporator 15 will be incomplete and the surplus liquid refrigerant flows from the evaporator through the gas heat exchanger 16 and pipe 19 to the vessel 26, decreasing the specific gravity of the absorption solution therein so that the liquid level will stand somewhat higher than that in the vessel 27. Operation then continues with the weaker solution causing complete evaporation. If the air temperature now falls the temperature of the evaporator falls, the thermostat switches off the heat supply to the boiler 10 and the action of the pump 12 ceases or is reduced. The liquid column in the boiler between the levels I and II together with the solution contained in the absorber coil continues to flow into the absorber vessel 27 raising the lever therein. Since the level in vessel 26 is higher than that in vessel 27 it will reach the opening 28 earlier and high concentration liquid will flow into the absorber vessel 27 returning some of the withdrawn refrigerant to the circuit. The mean concentration of the liquid in the accumulation vessel 26 is closed such that several operations of the thermostat are necessary before equalization of the concentration in the vessels 26, 27: The pipe 30 may be replaced by a small opening in the lower part of the partition 24. A small opening may be provided in the pipe 30 immediately above the base of the accumulation vessel; and the pipe 19 may open beneath the liquid level to improve the mixing and have an opening in its side to allow gas flow through the absorber vessel. Specification 319,015, [Class 29], is referred to.