Operation of an absorption heat transformer using water/ionic liquid as working fluid
Operation of an absorption heat transformer using water/ionic liquid as working fluid
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DOI：
10.1016/j.applthermaleng.2017.11.147
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发表时间：
2018-02
影响因子：
6.4
通讯作者：
N. Merkel';M. Bücherl;M. Zimmermann;Volker Wagner;K. Schaber
中科院分区：
文献类型：
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作者：
N. Merkel';M. Bücherl;M. Zimmermann;Volker Wagner;K. Schaber
本文介绍了单级吸收式热变压器（AHT）在工作流体为水/离子液体的情况下首次获得的实验结果。离子液体（IL）为1-乙基-3-甲基咪唑甲磺酸盐（EMIM OMs）。通过改变外部回路的入口温度和内部流量进行了几组实验。性能系数（COP）随高温的升高和介质温度的降低而降低。在较高的内部流速下，由于溶液热交换器效率的提高和设备内较高的热流，COP增加。实验结果与仿真结果的比较表明，在低温升力下，两者吻合较好。在较高的温度升程和较低的热流条件下，由于热损失、泵负荷和不确定性等因素的影响，实验结果与模拟结果存在较大的偏差。当吸收器内热流为5.5 kW，温度升程为18.5 K时，实验COP最高为0.43。最高温升为47 K。相应的COP为0.27，吸收器内热流为1.7 kW。
This work presents the first experimental results obtained with a single stage absorption heat transformer (AHT), which was operated with the working fluid water/ionic liquid. The ionic liquid (IL) used in this work was 1-ethyl-3-methyl-imidazolium methanesulfonate (EMIM OMs). Several sets of experiments were conducted by varying the inlet temperatures of the external circuits and the internal flow rates. The coefficient of performance (COP) decreases with increasing high temperature and decreasing medium temperature. At higher internal flow rates, the COP increases due to the improved efficiency of the solution heat exchanger and higher heat flows in the apparatuses. The comparison of the experimental results with simulation results shows a good agreement at low temperature lifts. At higher temperature lifts and lower heat flows in the apparatuses, the influences of heat losses, pump duties and uncertainties let the experimental results diverge from the simulated ones. The highest experimental COP was 0.43 at a heat flow of 5.5 kW in the absorber and a temperature lift of 18.5 K. The highest temperature lift was 47 K. The corresponding COP was 0.27 and the heat flow in the absorber 1.7 kW.