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首页> 外文期刊>Journal of Heat Transfer >Boiling Heat Transfer Coefficients in a Falling Film Helical Coil Heat Exchanger for the NH_3-LiNO_3 Mixture
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Boiling Heat Transfer Coefficients in a Falling Film Helical Coil Heat Exchanger for the NH_3-LiNO_3 Mixture

机译：降膜螺旋盘管换热器中NH_3-LiNO_3混合物的沸腾传热系数

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摘要

This paper reports the experimental data of boiling heat transfer coefficients for the ammonia-lithium nitrate mixture in a laminar falling film. The analyzed heat exchanger consists of a shell with an internal helical coil. More than one hundred test runs were carried out in steady-state conditions to determine the boiling heat transfer coefficients at generation temperatures, concentrations, and mass flow rates typical of absorption cooling systems of capacities between 5 and 10 kW. Ammonia vapor was produced at generation temperatures between 80 degrees C and 105 degrees C obtaining boiling heat transfer coefficients between 85 and 340 W/m(2)K. Semi-empirical correlations were used by diverse authors to correlate the experimental data. A new correlation was proposed with which the best adjustments were obtained. Also, the influence of the heat flux, the refrigerant solution mass flow rates, and the exit vapor qualities were analyzed in the boiling heat transfer coefficients.
机译：本文报道了层状降膜中氨-硝酸锂混合物沸腾传热系数的实验数据。分析的热交换器由带内部螺旋形线圈的外壳组成。在稳态条件下进行了一百多次测试，以确定容量为5至10 kW的吸收式冷却系统典型的产生温度，浓度和质量流率下的沸腾传热系数。在80到105摄氏度之间的产生温度下产生氨蒸气，沸腾传热系数在85到340 W / m（2）K之间。不同作者使用半经验相关来关联实验数据。提出了一种新的相关性，通过它可以得到最佳的调整。另外，在沸腾传热系数中分析了热通量，制冷剂溶液质量流量和出口蒸气质量的影响。

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