This paper in refrigeration analyses the effects of internal and external irreversibilities on the steady-state of a double irreversible absorption refrigeration system powered by a waste wood boiler. At the optimal steady-state of the maximum coefficient of performance, expressions of relaxation times of a double irreversible absorption refrigerator are derived. The influence of internal irreversibility parameters, heat leakage coefficient and heat transfer coefficients on relaxation times are discussed. Phase portraits for the trajectories are presented. The results of our analysis show that the eigen-values of the generator-absorber assembly are real with opposite signs while those of the evaporator-condenser are real and both negative. From these results, it follows that internal and external irreversibilities parameters have a draconian effect on the steady-state of the generator-absorber assembly which leads to the disturbance of the absorption system and consequently to its instability. The result can provide some theoretical guidelines for the designs of real absorption refrigerators.

本文在制冷中分析了内部和外部不可逆性对废柴锅炉驱动的双不可逆吸收式制冷系统稳态的影响。在最大性能系数的最佳稳态下，得出了双不可逆吸收式制冷机的弛豫时间表达式。讨论了内部不可逆参数，热泄漏系数和传热系数对弛豫时间的影响。给出了轨迹的相图。我们的分析结果表明，发生器-吸收器组件的特征值是真实的，具有相反的符号，而蒸发器-冷凝器的特征值是真实的，并且都为负。根据这些结果，由此可见，内部和外部不可逆性参数对发电机-吸收器组件的稳态产生严重影响，这会导致吸收系统的混乱，进而导致其不稳定。该结果可为实际吸收式冰箱的设计提供一些理论指导。