Double-effect absorption type refrigerating machine

一种将高温再生器(3)中发生的制冷剂蒸气供给低温再生器(12)并使其冷凝、经冷凝而液化后的制冷剂向冷凝器(11)供给的双重功效型的吸收式制冷机，在将由低温再生器(12)液化后的制冷剂向冷凝器(11)供给用的配管(7)上，设有节流孔(71)及控制阀(81)作为压力调整装置。在控制阀(81)上连接有控制电路(9)，从开始时到负荷稳定的期间使控制阀(81)全开，负荷稳定后，逐渐减小控制阀(81)的开度。或者在配管(7)上设置控制阀(118)，将压力控制成使高温再生器内的吸收液(中浓度液)浓度成为低温再生器(12)内的吸收液(浓液)浓度与吸收器内的吸收液(稀液)浓度的平均值。由此，无论制冷负荷大小都可实现比现有技术高的效率。 In a double-effect absorption chiller wherein the vapor of a refrigerant produced by a high temperature generator is supplied to a low temperature generator 12 for condensation, and the refrigerant liquefied by condensation is supplied to a condenser 11, a pipe 7 for supplying the refrigerant liquefied in the low temperature generator 12 to the condenser 11 therethrough is provided with an orifice 71 and a control valve 81 as pressure adjusting means. A control circuit 9 is connected to the control valve 81 to hold the valve 81 fully open during the period from the start-up of the chiller until the load is stabilized and thereafter gradually decrease the opening degree of the valve 81. Alternatively, a control valve 118 is mounted on the pipe 7 for controlling the pressure of the refrigerant so that the concentration of the absorbent (intermediate solution) in the high temperature generator becomes equal to the average of the concentration of the absorbent (strong solution) in the low temperature generator 12 and the concentration of the absorbent (weak solution) in an absorber. The chiller thus constructed achieves a higher efficiency than in the prior art regardless of the refrigeration load.