A New Approach for the Heat and Moisture Transfer in Desiccant Wheels Concerning Air Stream Velocity

Document Type : Full Lenght Research Article

Authors

1 Energy Department, Materials and Energy Research Center (MERC), Karaj, Iran

2 Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran

Abstract

Many investigators have presented mathematical work on desiccant wheels but there is a considerable discrepancy between published values and experimental values. A mathematical model based  on the two-dimensional  Navier-Stokes   equation has been derived to show the dehumidification trend of desiccant dehumidifier concerning air stream velocity. In this model the effect of air stream velocity on wheel performance as a momentum equation combined with heat and mass transfer has been studied.
The current model is capable of predicting the transient and steady-state transport in a desiccant wheel. It reveals the moisture and temperature in both the airflow channels and the sorbent felt, in detail, as a function of time. The predicted results are validated against the data taken from experimental results, with reasonable accuracy. Therefore, the numerical model is a practical tool for understanding and accounting for the complicated coupled operational process inside the wheel. Consequently, it is useful for parameter studies.

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Main Subjects


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