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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Comparison of the performance of single-effect, half-effect, double-effect in series and inverse and triple-effect absorption cooling systems operating with the NH_3-LiNO_3 mixture
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Comparison of the performance of single-effect, half-effect, double-effect in series and inverse and triple-effect absorption cooling systems operating with the NH_3-LiNO_3 mixture

机译：NH_3-LiNO_3混合物运行的单效，半效，双效串联和逆流和三效吸收式冷却系统的性能比较

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This paper presents the performance comparison of five different configurations of absorption cooling systems operating with ammonia-lithium nitrate. The configurations are: i) single-effect, ii) half-effect, iii) double-effect in series, iv) double-effect inverse and v) triple-effect. Mathematical models were developed for each one of the systems. Coefficients of performance are reported for the systems as function of their main operating temperatures, such as: generation, absorption, condensation, and evaporation. The results showed that the lowest evaporator temperatures can be achieved with half-effect systems at the lowest generator temperatures with coefficients of performance around 0.3. The single-effect system is the simplest configuration since it requires fewer components in comparison to the other systems. Its coefficients of performance are almost twice higher than those obtained with half-effect systems but requiring higher generator temperatures. With double-effect systems it is possible to obtain coefficients of performance as high as 1.12 at condenser temperatures of 30℃ but they need generator temperatures higher than 140℃ to reach evaporator temperatures as low as -5℃. The highest coefficients of performance can be achieved with triple-effect systems but they are the most complex, they require the highest generator temperatures and they should be mainly used for air conditioning.
机译：本文介绍了使用氨-硝酸锂运行的五种不同配置的吸收式冷却系统的性能比较。配置为：i）单效应，ii）半效应，iii）串联双效应，iv）双效应逆和v）三效应。为每个系统开发了数学模型。据报告，系统的性能系数是其主要工作温度的函数，例如：产生，吸收，冷凝和蒸发。结果表明，在最低发电机温度下，半效系统可实现最低蒸发器温度，而性能系数约为0.3。单效果系统是最简单的配置，因为与其他系统相比，它需要更少的组件。它的性能系数几乎是半效果系统获得的性能系数的两倍，但需要更高的发电机温度。使用双效系统，在冷凝器温度为30℃时可以获得高达1.12的性能系数，但它们需要发电机温度高于140℃才能达到低至-5℃的蒸发器温度。三效系统可以实现最高的性能系数，但它们是最复杂的，它们需要最高的发电机温度，因此应主要用于空调。

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