In this paper, a new combined cooling and power (CCP) system, based on ammonia-water absorption refrigeration cycle, is proposed to utilize low-temperature heat sources effectively. The system is characterized by that an ejector is introduced to lower the turbine back pressure by the evaporated ammonia vapor used for cooling, and is appropriate for the working scenarios needing much cooling capacity but bits of electricity. The system mathematical models are set up in detail, based on which the data of the system design working condition are obtained by numerical simulation. The results show that the net power output of the proposed system is 13% more than that of a similar system without ejector and moreover the system thermal efficiency could approach 45%. By performance comparison with a cascade-type CCP system, the proposed system shows the advantages of simple structure and good economy. Finally a thermodynamic parameter analysis is carried out to investigate the effects of five parameters on the system performance. The results show that there is an optimal rectification column pressure leading to the maximal net power output. The increases of rectification column pressure, turbine back pressure and evaporation temperature have negative effects on cooling capacity and thermal efficiency of the system, while the increase of absorber pressure has positive effects on the two indicators. Especially for the increase of ammonia-weak solution temperature of rectification column bottom, all the system performance experiences a process of increasing sharply, increasing slowly and decreasing slightly.

本文提出了一种基于氨水吸收制冷循环的新型冷电联供（CCP）系统，以有效利用低温热源。该系统的特点是引入了喷射器，利用蒸发的氨蒸气进行冷却，降低汽轮机背压，适用于制冷量大但电量少的工况。详细建立了系统数学模型，在此基础上通过数值模拟得到系统设计工况数据。结果表明，该系统的净功率输出比没有喷射器的类似系统高出13%，而且系统热效率可接近45%。通过与级联式 CCP 系统的性能比较，该系统具有结构简单、经济性好的优点。最后进行热力学参数分析，研究五个参数对系统性能的影响。结果表明，存在导致最大净功率输出的最佳精馏塔压力。精馏塔压力、汽轮机背压和蒸发温度的增加对系统的冷却能力和热效率有负面影响，而吸收塔压力的增加对这两个指标有正面影响。尤其是精馏塔底部弱氨溶液温度的升高，整个系统性能经历了一个急剧上升、缓慢上升和轻微下降的过程。最后进行热力学参数分析，研究五个参数对系统性能的影响。结果表明，存在导致最大净功率输出的最佳精馏塔压力。精馏塔压力、汽轮机背压和蒸发温度的增加对系统的冷却能力和热效率有负面影响，而吸收塔压力的增加对这两个指标有正面影响。尤其是精馏塔底部弱氨溶液温度的升高，整个系统性能经历了一个急剧上升、缓慢上升和轻微下降的过程。最后进行热力学参数分析，研究五个参数对系统性能的影响。结果表明，存在导致最大净功率输出的最佳精馏塔压力。精馏塔压力、汽轮机背压和蒸发温度的增加对系统的冷却能力和热效率有负面影响，而吸收塔压力的增加对这两个指标有正面影响。尤其是精馏塔底部弱氨溶液温度的升高，整个系统性能经历了一个急剧上升、缓慢上升和轻微下降的过程。结果表明，存在导致最大净功率输出的最佳精馏塔压力。精馏塔压力、汽轮机背压和蒸发温度的增加对系统的冷却能力和热效率有负面影响，而吸收塔压力的增加对这两个指标有正面影响。尤其是精馏塔底部弱氨溶液温度的升高，整个系统性能经历了一个急剧上升、缓慢上升和轻微下降的过程。结果表明，存在导致最大净功率输出的最佳精馏塔压力。精馏塔压力、汽轮机背压和蒸发温度的增加对系统的冷却能力和热效率有负面影响，而吸收塔压力的增加对这两个指标有正面影响。尤其是精馏塔底部弱氨溶液温度的升高，整个系统性能经历了一个急剧上升、缓慢上升和轻微下降的过程。而吸收塔压力的增加对这两个指标都有积极的影响。尤其是精馏塔底部弱氨溶液温度的升高，整个系统性能经历了一个急剧上升、缓慢上升和轻微下降的过程。而吸收塔压力的增加对这两个指标都有积极的影响。尤其是精馏塔底部弱氨溶液温度的升高，整个系统性能经历了一个急剧上升、缓慢上升和轻微下降的过程。