适用于浴池的Z字形双折式废气蒸发器的最优工况研究

Optimum Working Condition of Waste Gas Evaporator with Z-Shaped Double-Folded for Public Baths

目的优化Z字形双折式废气蒸发器最优工况,最大程度回收高校浴池洗浴过程中产生废气的热量,解决公共机构类浴池余热严重浪费的问题,合理利用非再生能源,减少环境热污染.方法结合某高校浴池在淋浴区布置,分析其浴室高湿废气的排放形式.利用增大换热面积,增大紊流强度强化对流换热.通过数值模拟方法,改变蛇管式蒸发器肋片角度及间距两参数,对速度、温度、压力进行模拟分析,得到18种工况肋片表面努赛尔数.高校浴池废水-废气采用双源热泵,废水热回收采用壳管式蒸发器,废气回收采用蛇管式带肋片蒸发器.结果蛇管式蒸发器在肋片角度为45°,肋片间距为6.5 mm工况时,其速度场与温度场协同效果强,对流换热效果更为显著,努赛尔数最大,蒸发器中流体进行的热交换最充分,蒸发器的换热效果最好.结论公共机构类浴池废水、废气余热回收可实现节能减排、治理空气污染,为公共辅助服务类建筑节能提供新思路.

In order to solve serious waste of waste heat from public institutions′baths,the research on the optimal working condition of z-shaped double-folding exhaust gas evaporator was carried out to optimize the use of non-renewable energy and reduce the environmental heat pollution,and the heat generated from waste gas in university baths was recovered to the greatest extent.Based on the layout of a university′s bath in the shower area,the discharge form of the bathroom′s high-humidity exhaust gas was analyzed.Convection heat transfer was strengthened by increase of the heat transfer area and the turbulence intensity.After the fins of the coiled tube evaporator and the two parameters of angle and spacing changed,through numerical simulation speed,temperature and pressure are analyzed to obtain the Nusselt number on the surface of the fins under 18 working conditions.The simulation results show that in university bath dual-source heat pump with waste water&exhaust gas is used,and the shell and tube evaporator is used for waste heat recovery.A snake tube type finned evaporator is used to waste gas recovery.when the fin angle is 45°and the fin spacing is 6.5 mm,the synergistic effect of the the snake tube type finned evaporator between velocity field and temperature field is strong,the convective heat transfer effect was more remarkable,the Nusselt number is the largest,the heat exchange by the fluid in the evaporator is the most sufficient,and the heat exchange effect of the evaporator is the best.In public baths waste water&exhaust gas can be recovery to achieve energy conservation and treatment of air pollution,which provide a new way of energy saving for ancillary services like public building.