固体吸附制冷吸附床数值分析及强化传热技术

建立了固体吸附制冷吸附床的物理模型和数学模型,通过数值分析得到床层温度分布及其各点温度随时间的变化情况,并分析吸附剂的物性参数、换热流体流速、温度和床层初始温度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、温度和床层初始温度对床层温度影响不大,但影响换热效率和传热速率.在径向上床层温度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,导热系数影响最大,其次是密度和比热容.因此为了提高传热效率,应增大吸附剂的导热系数,选取具有较小密度和比热容的吸附剂.

Solid Adsorbent Bed Numerical Analysis and Enhanced Heat Transfer Technology for Adsorption Bed of Solid Adsorption Refrigeration

Geometry model and mathematical model of adsorbent bed are established. The distribution of temperature field in the adsorbent bed can be got by numerical simulation for applying fluent. And the relationship between the temperature field and each parameter is analyzed. The results of numerical simulation are found that the coefficient of adsorbent have an important effect on the temperature of the adsorbent bed, and that the flow rate, the temperature of the heat transfer fluid of the adsorbent bed have little effect on the temperature of bed, and that the bed temperature distribution of different radial direction points is different and that of different axial direction points is uniform. The result indicated that, the absorbent parameter is remarkable to the bed level temperature distribution, In the absorbent natural parameter, the thermal conductivity is biggest to the bed level temperature change. Therefore, in order to enhance heat transfer efficiency of the adsorption bed, it should increase as far as possible the absorbent thermal conductivity, and as well as adopts many kinds of strengthening to improve heat transfer efficiency of adsorbent bed.