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Development of a method for isobaric large temperature jump adsorption experiments
Applied Thermal Engineering ( IF 6.4 ) Pub Date : 2021-06-18 , DOI: 10.1016/j.applthermaleng.2021.117251
Christian Teicht

Adsorption heat pumps offer the possibility to provide cold from waste heat, and can therefore be an important component for an environmentally friendly and sustainable cooling supply. A new accurate measurement method is developed to evaluate the progress of performance improvement in this area through new material and heat transfer concepts. The new method covers the entire sample range from very small to large sample sizes and also allows measurements in the poorly accessible transition region of medium sample sizes in the range from 1 to 10 g. A comparison with the conventional volumetric method in large temperature jump adsorption experiments is carried out using granular TiAPSO-34 in a flatbed configuration as adsorbent. The sample mass is varied from 300 mg to 1709 mg and the influence on the adsorption rate is compared using the characteristic time constants describing the dynamics of the adsorption reaction. It can be shown that the time constant for the new method is almost constant with a maximum deviation of 9% while the characteristic time constant for the conventional method varies up to 64%. The difference in adsorptive loading per adsorbent varies from 0.193 to 0.197 for the new method and from 0.100 to 0.190 for the conventional method. The new measurement method thus provides significantly more reliable results for the design of adsorption heat pumps than the previous volumetric measurement method. From the experimental results it can also be concluded that the new measurement method can be used in the present case up to sample sizes of 600 g which makes the gravimetric version of the large temperature jump method obsolete in this case.



中文翻译:

等压大温跃吸附实验方法的研制

吸附热泵提供了从废热中提供冷量的可能性,因此可以成为环保和可持续冷却供应的重要组成部分。开发了一种新的精确测量方法,通过新的材料和传热概念来评估该领域性能改进的进展。新方法涵盖了从非常小到大样本量的整个样本范围,并且还允许在 1 到 10 克范围内的中等样本量的难以接近的过渡区域进行测量。使用平板结构中的颗粒状 TiAPSO-34 作为吸附剂,在大型温度跳跃吸附实验中与传统的体积法进行了比较。样品质量从 300 毫克到 1709 毫克不等,并使用描述吸附反应动力学的特征时间常数来比较对吸附速率的影响。可以看出,新方法的时间常数几乎恒定,最大偏差为 9%,而传统方法的特征时间常数变化高达 64%。对于新方法,每个吸附剂的吸附负载差异从 0.193 到 0.197,对于传统方法从 0.100 到 0.190。因此,与以前的体积测量方法相比,新的测量方法为吸附式热泵的设计提供了更可靠的结果。

更新日期:2021-06-25
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