Dynamic study of a single effect absorption chiller using the pair LiBr/H2O
Dynamic study of a single effect absorption chiller using the pair LiBr/H2O
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DOI：
10.1016/j.enconman.2015.11.009
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发表时间：
2016-01
影响因子：
10.4
通讯作者：
A. Ochoa;J. Dutra;J. Henríquez;C. Santos
中科院分区：
文献类型：
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作者：
A. Ochoa;J. Dutra;J. Henríquez;C. Santos
对单效溴化锂-水（LiBr/H2O）吸收式制冷机进行了动态分析。基于质量守恒、能量守恒和组分守恒原理，建立了吸收式制冷过程中对流换热系数之间的关联式，从而确定制冷机换热器的总换热系数。该数学模型的实现建立在Matlab平台上，并利用显式有限差分法求解非线性方程组。该模型能够模拟和预测内部和外部参数的行为，如温度，浓度和压力，当这些受到电源和热负荷中断。通过水回路中的实验数值验证模型时发现，热水、冷水和冷水的最大绝对差异分别约为1.0 °C、0.7 °C和0.2 °C。就相对误差而言，这些偏差最大为5%，最小为0.3%。当受到负载和电源干扰时，该模型显示出良好的结果，因为它再现了温度参数和性能系数（COP）的行为，与制造商提供的数据进行的比较一致，操作条件下的COP约为0.7。
This paper sets out to make a dynamic analysis of a single-effect, lithium bromide–water (LiBr/H2O) absorption chiller. A mathematical model has been developed based on conserving mass, energy, and species, which considers the correlations of the convective coefficients of absorption refrigeration processes so as to determine the overall heat transfer coefficients of the heat exchangers of chillers. The implementation of this mathematical model was built on the Matlab platform, and resolved the system of non-linear equations by making explicit use of the finite difference method. The model has the ability to simulate and predict the behavior of internal and external parameters such as temperature, concentrations and pressures when these are subjected to disruptions in the power supply and thermal load. The largest absolute differences found when validating the model by means of the experimental numerical values in the water circuits were approximately 1.0 °C, 0.7 °C and 0.2 °C for hot, chilled and cold water, respectively. In terms of relative error, these divergences represent a maximum of 5% and a minimum of 0.3%. The model showed good results when subjected to disturbances in the load and power source, as it reproduced the behavior of the temperature parameters and the Coefficient of Performance (COP), in line with the comparisons made with the data provided by the manufacturer, the COP being approximately 0.7 for operating conditions.