扩散吸收式制冷系统中冷凝器的数值研究

Numerical studies on the condenser in the diffusion-absorption refrigeration system

对空冷翅片式和水冷光管式两种冷凝器进行了数值模拟,模拟了不同结构、不同对流换热系数、不同流速下氨液的冷凝量。结果表明:冷凝器管内热阻比管外热阻对氨气的冷凝影响更大;管径一定时,氨液冷凝量随入口速度的的增大而减小,当速度增加到某一值时,冷凝量基本不发生变化,对空冷翅片式冷凝器该速度为0.15m/s,水冷光管式为0.2m/s。

This study made a numerical simulation of the two kinds of condensers of air cooling fin and smooth tube, and simulated the total clotted ammonia liquid with different structures, convective heat transfer coefficients and velocities. The result exhibits that thermal resistance inside condensers＇tube has more influence on the condensed ammonia liquid than that outside con- densers＂ tube. When the diameter is fixed, the total clotted ammonia liquid appears to decrease along with the increase of the inlet velocity. When the velocity comes to a certain value （condenser of bank -fin is 0.15m/s while condenser of smooth tube is 0. 2m/s） , the total condensed liquid remains still basically.