. Applied thermodynamics for engineers. n of ammonia inwater. The solution of vapor in this water produces a suction which con-tinually draws vapor over from C to D. The solubility of ammonia inwater decreases as the temperature increases, so that the evolution of heatin the absorber must be counteracted by jacketing that vessel with water * The absorption increases as the temperature decreases and as the pressureincreases. f Generally, the heat evolved per pound of water is (927xo—142x0^) B. t. u., whereX is the proportion of NH3 to water, by weight. J The boiling point of the solution is les
. Applied thermodynamics for engineers. n of ammonia inwater. The solution of vapor in this water produces a suction which con-tinually draws vapor over from C to D. The solubility of ammonia inwater decreases as the temperature increases, so that the evolution of heatin the absorber must be counteracted by jacketing that vessel with water * The absorption increases as the temperature decreases and as the pressureincreases. f Generally, the heat evolved per pound of water is (927xo—142x0^) B. t. u., whereX is the proportion of NH3 to water, by weight. J The boiling point of the solution is less than that of water at the same X is the proportion by weight of NH3, the amount of such reduction is in deg. F., + in which a= — . The approximate density of the solution is (water =1) (x-x2+x3). The partial vapor pressure due to the steam is approximately /1700-1700x\^ \1700 + 100x/ where jp is the saturation pressure of pure steam at the generator temperature. ABSORPTION APPARATUS 471. Fig. 310. Arts. 640, 642.—Ammonia Absorption Apparatus. or installing water coils in the solution. The waste water from the con-denser may be used for this cooling. The more concentrated portion ofthe liquid in D is now pumped through/to A, while the weaker solutionis drawn off from the bottom of A and returned to the top of D through coil heater at E provides for the interchange of heat, thus warming theliquid entering A and cooling that entering Z>, as is to be desired. 641. Cycle. From the condenser to the vaporizer, the operation isidentical with that in a compression plant. The absorber and generatorreplace the compressor. The rise in pressure occurs between the pump /and the generator outlet a. In Fig. 311, B may be taken as the state ofthe gas entering the condenser, in which it ig liquefied along BA. Ex-pansion reduces its pressure, givingthe path AJ. In passing through thevaporizer, the liquid is evaporatedalong JC. It cannot b
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