GB191316833A - Improvements in Absorption Machines for Transforming Heat, Cold and Mechanical Work. - Google Patents

Abstract

16,833. Altenkirch, E., and Tenckhoff, B. Aug. 11, 1911, [Convention date]. Vapour-engines. -Relates to machines for transforming heat, cold, and mechanical work of the type in which a working fluid passes through a cycle of changes involving heating, cooling, expansion, and compression, before returning to its original condition, the type of apparatus being known in connexion with refrigerating as the absorption type, and employing typically ammonia as the working fluid. The principle of working described in Specification 18,511/12 is extended so that the highest temperature in the absorber may exceed the lowest temperature in the generator, heat interchange being effected between those parts of the generator and absorber that overlap in temperature. Fig. 1 shows such a plant diagrammatically, with pressnre and temperature as ordinates, the example given being arranged on the counterflow principle whereby is realized the polytropic cycle, with heat transfer at a constant temperature difference, as described in Specification 18,511 / 12. Cold rich liquor is forced from the absorber a by a pump e into the piping f and passes in counterflow through the absorber before leaving it at a point, the temperature of which is the same as that of the coolest end of the generator b. The liquor thus passing into the generator at r is there distilled by means of a heating-coil h, the hot poor liquor eventually entering a pipe g at q in order to retraverse the hot end of the generator in counterflow until it passes at s into the absorber at the highest temperature thereof. The ammonia vapour follows the usual course from the generator to the condenser c, supplied with cooling-water by pipes i, thence evaporating in the refrigerator d and producing cold which is communicated to a brine system n. Suitable arrangements are made for heat exchange between the " overlapping " portions of the generator and absorber, and these take account of the excess in consumption of heat in the generator over the production of heat in the absorber at the same temperature level, for which purpose the rate of circulation of heat-exchanging fluids, or the relative crosssections of pipes may be suitably chosen. The excess of heat may be supplied to the generator by the exhaust gases of a furnace. When the plant is designed to produce mechanical work, the vapour passes from the generator to a working-cylinder and thence to the absorber.