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以能的梯级利用原理为指导原则,基于正逆循环耦合方法,本文提出了一种利用中温显热热源制取较低温度冷量的复合式制冷系统,该系统由动力子循环、吸收式制冷子循环与压缩式制冷子循环有机耦合而成。通过模拟计算,对系统热力性能进行了评估,系统制冷性能系数(COP)达到了0.277,与常规余热双级吸收式制冷系统相比,提高了50%左右。通过(火用)平衡和t-Q图分析,发现热源利用过程不可逆损失大幅降低是系统性能提升的主要原因。本文还研究了热源烟气温度T_H和冷却水温度T_(CW)对系统性能的影响,为指导系统设计提供了依据。
Based on the principle of cascade utilization principle, based on the positive and negative cycle coupling method, this paper presents a compound refrigeration system which uses the moderate temperature sensible heat source to make lower temperature and cooling capacity. The system consists of dynamic sub-cycle, absorption refrigeration Sub-cycle and compression refrigeration sub-cycle organic coupling made. Through the simulation calculation, the thermal performance of the system was evaluated. The COP of the system reached 0.277, which was about 50% higher than that of the conventional two-stage absorption heat recovery system. Through exergy equilibrium and t-Q diagram analysis, it is found that the drastic reduction of irreversible loss during heat source utilization is the main reason for the improvement of system performance. In this paper, the influence of heat source flue gas temperature T_H and cooling water temperature T_ (CW) on the system performance is also studied, which provides the basis for guiding system design.