空调卧室空气环境的数值模拟

用CFD方法模拟了空调卧室内制冷制热运行时3种不同的住宅空调模式(包括普通窗式空调器、分体机及具有引入新风的热回收装置的窗式空调器)分别位于高位置和低位置时室内空气温度及流速、有机污染物(甲醛)浓度及CO2的分布,并进行比较.结果表明,空调器的类型、位置及新风量对空气环境影响较大.夏季制冷运行时,带热回收装置的窗式空调器置于低位置时可以获得良好的室内流场分布,稀释和携带走室内的CO2和污染物;而该装置置于高处时,流场结构不合理;其它空调模式下由于没有引入新风,产生室内污染物堆积.冬季制热运行与夏季制冷运行时的结论相同.

Numerical Simulation of Indoor Air Environment in Bedrooms with Room Air-Conditioners

The indoor air movement of a common bedroom with different room air conditioner modes was predicted through Computational Fluid Dynamics(CFD) method in summer and winter.Three room air-conditioner modes were adopted and studied,including a new window-type air conditioner(NWRAC) that could take in outdoor fresh air with heat recovery facility,a conventional window-type air conditioner(CWRAC) and a split air conditioner(SRAC).They were high-level or low-level respectively.Distributions of indoor air parameters(velocity,temperature,concentration of formaldehyde and exhalant Carbon dioxide(CO_2)) were obtained and compared.The results showed that air conditioner types,locations and fresh air had important influence upon indoor air environment.Under low NWRAC operation,the concentrations of CO_2 and pollutant could be diluted by fresh air and be taken out by exhaust air in summer.However,the distributions of indoor comfort parameters were unreasonable under the high NWRAC mode.When other modes were adopted,without taking in fresh air,the concentrations of pollutant and CO_2 were high and were even accumulating.In winter,the situations of indoor air environments were nearly similar to that in summer.