Abstract
Fluidised desiccant cooling is reported in the literature as an efficient way to provide cooling for air-conditioning purposes. The performance of this technology can be described by electric and thermal Coefficients of Performance (COP) and Specific Cooling Power (SCP). In this paper comprehensive theoretical study was carried out in order to assess the effect of operating conditions such as: superficial air velocity, desiccant particle diameter, bed switching time and desiccant filling height on the performance of fluidised desiccant cooler (FDC). It was concluded that FDC should be filled with as small as possible desiccant particles featuring diameters and should not be operated with shorter switching times than optimum. Moreover in order to efficiently run such systems superficial air velocities during adsorption and desorption should be similar. At last substantial effect of desiccant filling height on performance of FDC was presented.
Highlights
Fluidised desiccant cooling is reported as an efficient way to provide cooling for airconditioning purposes [1]
On the other hand these processes depend on operating conditions such as bed switching time tsw, desiccant particles diameter dp, superficial velocity Udes and Uads and mass of desiccant Md in the fluidised bed
For desiccant particle diameter of 1 mm thermal Coefficients of Performance (COP) remains high in the investigated range of switching times and its maximum value reaches ca. 0.54
Summary
Fluidised desiccant cooling is reported as an efficient way to provide cooling for airconditioning purposes [1]. The hot air enters the fluidised bed, where due to high air temperature, desorption of water from the desiccant takes place. Where ε is void fraction of the fluidised bed, g is gravitational acceleration, Δw is change of desiccant water uptake, Hev is heat of evaporation, ΔTmean is mean air temperature difference between outlet and inlet during desorption and cg is specific heat of air. On the other hand these processes depend on operating conditions such as bed switching time tsw, desiccant particles diameter dp, superficial velocity Udes and Uads and mass of desiccant Md in the fluidised bed Influence of these parameters on FDC COPs and SCP were not yet investigated. It contributes to better understanding of FDC operation and its limitations
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