被动房新风机内循环工艺优化分析

Optimization Analysis of the Internal Circulation Technology for Outdoor Air Exchanger in Passive Housing

本文提出一种适用于被动房住宅新风机的内循环工艺,利用数值模拟研究阀门高度、排风阀和回风阀的开度等对其性能的影响,并通过实验验证。另外,本文还分析了具有内循环工艺的新风机的节能效果。结果表明:实验值和模拟值相对误差为13.75%,数值模拟结果与实验值基本保持一致;新风机内循环回风阀设置在循环箱体底端上方160mm处最合理,此时通过回风阀的风量为82.32m^3/h,空气均由排风通道穿过回风阀进入新风通道,气流均匀;回风阀开度的变化对回风量的影响比排风阀开度的设置对回风量的影响更大;随着送风量的增加回风阀回风量呈线性增大趋势;相对于无内循环工艺的新风机,有内循环工艺的新风机可降低54.6%的能耗。

An internal circulation process which is suitable for the outdoor air exchanger in passive housing was proposed, and the influence of the valve height, the opening degree of the exhaust valve and the return air valve on its performance was studied by numerical simulation, which were verified though the experimental results. In addition, the energy saving effect of the outdoor air exchanger with the internal circulation technology was analyzed. The results show that the error value is 13.75% between the test and the simulation value, which shows that the numerical simulation results are consistent with the experimental values. The return air valve is arranged at the 160mm above the bottom of the circulation box, at this time, the air volume through the return air valve is 82.32m3/h, and the air in the exhaust passage passes into the outdoor air channel uniformly through the return air valve. The effect of the change of the return air valve opening on the return air volume is greater than that of the exhaust valve opening. The return air volume of the return valve increases linearly with the air supply volume. It is concluded that the outdoor air exchanger with the internal circulation technology can reduce the energy consumption of 54.6% than that without the internal circulation technology.