An advanced analytical model of the Diffusion Absorption Refrigerator cycle
An advanced analytical model of the Diffusion Absorption Refrigerator cycle
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DOI：
10.1016/j.ijrefrig.2011.11.007
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发表时间：
2012-05
期刊：
影响因子：
--
通讯作者：
G. Starace;L. D. Pascalis
中科院分区：
文献类型：
--
作者：
G. Starace;L. D. Pascalis
一个新的DAR的热力学模型的性能的结果进行了比较与Zohar等人的预测。（2009年）。主要的区别是由于制冷剂成分的精确建模，假设为纯氨。灵敏度分析表明，随着发生器温度的升高，富液质量流量的降低幅度大于制冷剂质量流量的降低幅度，COP降低。这也会随着吸收温度的升高而发生，这是由于氨在稀溶液中的吸收较低。当氨浓度降低时，COP增加。此外，对于较低的热通量提供给发电机，向周围环境的散热占主导地位，COP变小;当热通量超过阈值时，蒸发器达到其最大热传递，保持恒定的任何进一步增加的热量供应。COP在发电机的操作条件的有限范围内呈现其最高值。
The results about the performance of a new DAR’s thermodynamic model are compared with the predictions of Zohar et al. (2009). The main difference is due to an accurate modeling of the refrigerant composition, assumed there as pure ammonia. A sensitivity analysis shows that, as the generator temperature increases, the rich solution mass flowrate reduces more than that of the refrigerant one, and COP decreases. This happens as the absorption temperature increases as well, due to the lower absorption of ammonia in the weak solution. COP was found to increase when the ammonia concentration decreases. In addition, for lower heat fluxes supplied to the generator, the heat dissipation toward ambient dominates and COP becomes small; when the heat flux overtakes a threshold, the evaporator reaches its maximum heat transfer, that remains constant for any further increase of heat supplied. COP presents its highest values over a limited range of the generator’s operating conditions.