GB338935A - Process for refrigeration and apparatus connected therewith - Google Patents

Abstract

338,935. Maiuri, G., and Bossini, R. F. May 31, 1929, [Convention date]. Refrigerating.-A mixture of fluids of different boiling points, e.g. ammonia and water, is heated in a generator and rectifier column 2, 1 to separate the fluids in gaseous form, the less condensible fluid passing from the top of the rectifier through a conduit 5 to a condenser 6 cooled externally, as by cooling water, whence it flows as liquid through a liquid seal 7 into an evaporator 8. Some of the more condensible medium in gaseous form is led from the generator to a nozzle 9 to induce a flow of mixed gases from the evaporator to a condenser member 10 preferably located in the rectifier and of fairly high temperature, whence the readily condensible medium returns through a seal 14 to the lower part of the generator. The less condensible medium of the mixture passes up into a further condenser element 11, 12 surrounded by the cooling water and is returned in liquid form through a seal 13 into the upper part of the rectifier. In the example shown an inert gas circulates through the evaporator and the condenser elements 10, 12, this gas being led in a cooled condition to the upper end of the evaporator. The inert gas may be used to balance only a part of the pressure differences, or in place of using inert gas the condensed refrigerant may be expanded through a valve in place of the seal 7, and pumps may be employed to overcome the pressure differences. Baffle plates are provided in the generator and rectifier, the lower ones 3 forming liquid head pockets sufficient to provide pressure head for the nozzle 9, while the upper ones 4 do not retain liquid. A heat exchanger for gasesentering and leaving the evaporator may be provided. The condensers may be fitted with plates over which the condensate flows slowly. In a modification the rectifier and condenser elements are in the form of coils, the upper condensers being air cooled and the lower one united, as by soldering, to the rectifier to exchange heat therewith. The rectifier coil terminates in a bell dipping into liquid in the generator so that a pressure head for the gas nozzle is obtained. The Specification as open to inspection under Sect. 91 (3) (a) mentions also the use of sulphur dioxide and carbon dioxide, and ethyl alcohol and methyl chloride as mixed fluids. This subjectmatter does not appear in the Specification as accepted.