Simulation of Hybrid Packed Desiccant beds for De-humidification and Drying 2020-28-0019
The conventional vapour compression refrigeration cycle based air dryers are used widely for the applications requiring pressure dew point temperature ranging between 2°C to 3°C. However, for the industrial and pneumatic applications, the required pressure dew points are as low as between -10°C to -75°C. This kind of low pressure dew points can be achieved by the adoption of adsorption based packed bed desiccant dryer technology. In this paper the numerical investigation of the performance of a packed bed desiccant dryer containing homogenous mixture of multiple desiccant types along the vertical axial direction using an in-house finite volume based CFD code is presented. The developed code has the capability to model the coupled heat and mass transfer taking place in a packed hybrid bed desiccant dryer during the adsorption and desorption phases. The numerical results obtained for the base model are validated against relevant experimental data for exit air temperature and moisture content available in the literature and found to have good agreement. Subsequently using the validated numerical model, the improvement in moisture removal capacity, relative moisture removal efficiency and dew point temperature or pressure dew point that are achievable using the proposed hybrid desiccant bed under wide operating conditions are investigated.
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