Influence of the atmospheric pressure on the mass transfer rate of desiccant wheels.
Influence of the atmospheric pressure on the mass transfer rate of desiccant wheels.
复制标题
大气压力对干燥轮传质速率的影响。
DOI：
10.1016/j.ijrefrig.2010.11.013
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
A. Figueiredo
中科院分区：
文献类型：
--
作者：
C. Ruivo;J. Costa;A. Figueiredo
除湿轮的性能是通过模拟一个有代表性的通道来评估的。假设在横向上的传热和传质的阻力可以忽略不计，在薄的多孔干燥剂壁的通道和空气流被视为一个整体流。进行了参数研究，以调查大气压力从101，325 Pa降至60，000 Pa的影响（海拔0-4217 m）对干燥剂转轮传质速率的影响，考虑不同的通道长度和不同的入口气流速率，大范围的转速值，以及指定再生和处理气流的入口条件的三种可选方式。提出了一种基于数值计算结果的关联式求解方法，用于求解除湿转轮在非标准大气条件下运行时的传质速率修正系数。进行了四个参数的研究，推导出的相关性进行了测试，并发现一个很好的协议之间的估计校正因子和校正因子计算后的数值结果。
The performance of a desiccant wheel is evaluated by modelling a representative channel. The hypothesis of negligible resistances to heat and mass transfer in the cross-direction is assumed in the thin porous desiccant wall of the channels and the airflow is treated as a bulk flow. Parametric studies were conducted to investigate the influence of the atmospheric pressure decrease from 101,325 Pa to 60,000 Pa (0–4217 m of altitude) on the mass transfer rate of desiccant wheels considering distinct channel lengths and different inlet airflow rates, a large range of values of the rotation speed, as well as three alternative ways to specify the inlet conditions of the regeneration and of the process airflows. A procedure to derive correlations based on the numerical results is presented for the correction factor of the mass transfer rate when a desiccant wheel is operating at non-standard atmospheric conditions. Four parametric studies were performed, the derived correlations were tested and a good agreement was found between the estimated correction factor and the correction factor calculated after the numerical results.