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Assessment of the adsorber surface density influence on the performance and operation of the intermittent SAR system

机译：评估吸附器表面密度对间歇SAR系统性能和运行的影响

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The adsorber surface density is a chief factor which is strongly coupled with other design parameters and climate conditions. This parameter has a considerable impact on the behaviour and operation of the intermittent solar adsorption refrigeration (SAR) system. This paper presents a theoretical investigation of the impact of the adsorption reactor surface density on the behaviour and overall performance indices of the intermittent SAR system. A water chiller which uses silica gel and water adsorption pair is studied under the climate conditions of Riyadh. The mathematical model is developed and a computer program is constructed to run the dynamic simulation of the chiller. Results obtained from the study show that the studied water chiller will fail to complete the cycle and to produce a cooling effect when the surface density is greater than 44 kg/m~2. Moreover, the coefficient of performance (COP) increases with decreasing the surface density. Additionally, the optimum solar-to-cold conversion factor attains a value of 0.2 corresponding to surface density of 12.6 kg/m~2 and COP of 0.43. This shows that the COP is not the accurate gauge for the SAR system performance and the solar-to-cold conversion factor is suggested when evaluating SAR system performance.
机译：吸附器表面密度是主要因素，它与其他设计参数和气候条件密切相关。此参数对间歇性太阳能吸附制冷（SAR）系统的行为和操作有很大影响。本文对吸附反应器表面密度对间歇SAR系统的行为和整体性能指标的影响进行了理论研究。在利雅得的气候条件下，研究了使用硅胶和水吸附对的冷水机。开发数学模型，并构建计算机程序以运行冷却器的动态仿真。从研究中获得的结果表明，当表面密度大于44 kg / m〜2时，所研究的冷水机将无法完成循环并产生冷却效果。此外，性能系数（COP）随着表面密度的降低而增加。另外，最佳的太阳到冷的转换系数达到0.2的值，对应于12.6 kg / m〜2的表面密度和0.43的COP。这表明COP并不是衡量SAR系统性能的准确指标，并且在评估SAR系统性能时建议使用太阳到冷的转换因子。

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