太阳能吸附制冷空调吸附床温度场数值模拟与传热分析

Numerical simulation and heat transfer analysis of temperature field for adsorption bed of solar energy adsorption refrigeration air conditioner

建立了吸附床几何模型和数学模型,通过Fluent软件数值模拟得到床层温度分布的变化情况,并深入分析床层参数变化对床层温度分布的影响。结果表明,吸附剂的物性参数对床层温度分布影响显著;换热流体流速、温度对床层温度影响不大。在床层径向上存在着较大的温度梯度,但在轴向上温度分布比较均匀。在吸附剂的物性参数中,导热系数对床层温度变化影响最大。因此为了提高吸附床传热效率,应尽量增大吸附剂的导热系数,以及采取多种措施强化吸附床的传热效率。

Geometry and mathematical model of adsorption bed were established. With the numerical simulation, the distribution of temperature field in adsorbent bed was got by applying Fluent software and the relation between temperature field and each parameter was analyzed. The numerical simulation results show that the coefficient of adsorbent have important effect on adsorbent bed temperature while the flow rate and the temperature of heat transfer fluid of the adsorbent bed have little effect on the bed temperature. There was a large gradient of bed temperature distribution in radial direction while the temperature was uni- form in axial direction. The result also indicates that the absorbent parameter is remarkable to the bed level temperature distribution, the thermal conductivity has more effect on the change of bed level temperature than others in absorbent natural parameters. So the absorbent thermal conductivity should be increased as far as possible to enhance heat transfer efficiency of the adsorption bed and improve the heat transfer efficiency of adsorbent bed.