A novel constant-air-volume range hood for high-rise residential buildings with central shaft

A novel constant-air-volume range hood for high-rise residential buildings with central shaft
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一种新型中轴高层住宅定风量抽油烟机

DOI:
10.1016/j.enbuild.2021.111086
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发表时间:
2021-08
影响因子:
6.7
通讯作者:
Chenquan Zhang
Chenquan Zhang
中科院分区:
工程技术2区
文献类型:
--
作者:
Lingjie Zeng;Leqi Tong;Jun Gao;Bowen Du;Changsheng Cao;Lipeng Lv;Chenquan Zhang

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本研究提出一种新型定风量抽油烟机的控制逻辑。磁场定向控制矢量用于通过将当前排气量与期望值进行比较来调节风扇速度。对所研制的定风量吸油烟机进行了风量保持能力试验。试验结果表明,在一定的风机静压范围内,定风量吸油烟机的排风量可以保持恒定。为验证该定风量抽油烟机在真实的中央排风竖井中的运行性能,将实验得到的风机性能曲线代入已建立的风道水力模型,计算了不同风机曲线和竖井重合系数下的排风量分布。模拟结果表明,在中央排风井中,CAV型抽油烟机可以在较低的重合系数(如:0.2)但是当中心轴的重合系数高(0.4或0.6)时,其保持恒定排气量的能力降低。提出了一种分级多档位控制方法,以解决风扇噪声和静压限制问题。当达到转速阈值时,风扇会自动切换到较低的排气档位。
This study proposed a control logic for a novel constant-air-volume (CAV) range hood. The Field Oriented Control vector was used to adjust the fan speed by comparing the current exhaust volume to the desired value. Experiments were conducted to test the air volume retention ability of the developed constant-air-volume range hood. Test results show that within a certain range of fan static pressure, the exhaust air volumes of the constant-air-volume range hood can remain constant. To verify the operation performance of such constant-air-volume range hood in a real central exhaust shaft, the performance curves of the fan obtained from the experiments were substituted into the our previously developed ductwork hydraulic model to calculate the distribution of the exhaust air volume under varied fan curves and shaft coincidence factors. Modeling results indicate that in a central exhaust shaft, the CAV range hood can meet user’s varied exhaust demand at low coincidence factor (e.g., 0.2) but its capability to maintain constant exhaust air volume decreases when the coincidence factor of the central shaft is high (0.4 or 0.6). A staged multi-gear control method was also proposed to address the fan noise concern and static pressure limitation. The fan can automatically switch to a lower exhaust gear when it reaches the threshold of the rotating speed.
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