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The Generator-Absorber Heat Exchange (GAX) ammonia water absorption heat pump   has a relatively high efficiency and the COP is improved by recovering   internal heat. In order to resolve the problem that GAX effect becomes less   obvious or even fails under the working condition of large temperature lift,   a novel system is proposed to recover the rectification heat and absorption   heat by solution split method. Compared with the method of using total   strong solution to recover absorption heat after extracting rectification   heat, the method of solution split avoids the problem of high temperature of   inlet strong solution of the solution cooled absorber, and improves the   internal heat recovery capacity of the system. When using solution split   method to recover the rectification heat and absorption heat, the solution   split ratio K has an important influence on the system performance. This   paper will theoretically study the selection range of the solution split   ratio K and the effect of evaporation temperature, cooling water temperature   and generation temperature on the optimum split ratio K. Compared to the   system that uses the total strong solution to recover the rectification heat   and absorption heat, the performance of the novel system is significantly   improved, and the novel system performance coefficient can be increased by   up to 15.7%.

Simulation analysis of performance optimization of gas-driven ammonia-water absorption heat pump