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The effect of different diffusers designed for empty cells in central air handling units on flow and pressure drop
Science and Technology for the Built Environment ( IF 1.7 ) Pub Date : 2020-06-11 , DOI: 10.1080/23744731.2020.1776536
Ahmet Vakkas Vakkasoglu 1 , Muhammed Safa Kamer 1 , Ahmet Kaya 1
Affiliation  

In this study, three different diffusers (V profile perforated, flat anemostat type, and pyramid anemostat type) have been designed in order to spread the air in shorter distance in empty cells used in central air handling units. The pressure drop caused by these diffusers has been investigated experimentally. The diffusers are mounted at the center of the fan outlet section, up or down the center (the center deflection ratio) and at different distances horizontally (the center distance ratio). It has been determined that the positioning of the diffusers at different distances from the fan outlet section horizontally has a significant effect on the pressure drop. As a result of the experimental study; among the three diffusers, the lowest pressure drop has been obtained from the pyramid anemostat type diffuser. The effect of the position of this diffuser in the empty cell on the flow distribution has also been investigated numerically. The numerical studies have been performed in the ANSYS-Fluent 18.1 program. In the empty cell, the velocity distribution closest to the homogeneous has been obtained by mounting the pyramid anemostat type diffuser at the position where the center distance ratio was 0.017 (5 mm distance from the center) and the center deflection rate was 1.14 (20 mm upward from the center). The minimum pressure drop value has been obtained in the position where the center distance ratio was 0.35 (105 mm away from the center) and the center deflection ratio was 0.86 (20 mm downward from the center).



中文翻译:

设计用于中央空调单元中的空单元的不同扩散器对流量和压降的影响

在这项研究中,设计了三种不同的扩散器(V型穿孔,平型止血剂类型和金字塔型止血剂类型),以使空气以较短的距离散布在中央空气处理单元中使用的空单元中。由这些扩散器引起的压降已经通过实验进行了研究。扩散器安装在风扇出口部分的中心,中心向上或向下(中心偏斜率),水平方向上不同距离(中心距离比)。已经确定,将扩散器水平地放置在距风扇出口部分不同距离处对压降有显着影响。实验研究的结果;在这三个扩散器中,最低的压降是从金字塔型止血剂型扩散器获得的。还已经数值研究了该扩散器在空室中的位置对流量分布的影响。数值研究已在ANSYS-Fluent 18.1程序中进行。在空单元中,通过在中心距离比为0.017(距中心5毫米)和中心偏转率为1.14(20毫米)的位置安装金字塔型消泡剂型扩散器,获得最接近均质的速度分布。从中心向上)。在中心距离比为0.35(距中心105mm)且中心挠度比为0.86(距中心向下20mm)的位置获得最小压降值。数值研究已在ANSYS-Fluent 18.1程序中进行。在空单元中,通过将金字塔型消泡剂型扩散器安装在中心距离比为0.017(距中心5毫米)和中心偏转率为1.14(20毫米)的位置,获得了最接近均质的速度分布。从中心向上)。在中心距离比为0.35(距中心105mm)且中心挠度比为0.86(距中心向下20mm)的位置获得最小压降值。数值研究已在ANSYS-Fluent 18.1程序中进行。在空单元中,通过在中心距离比为0.017(距中心5毫米)和中心偏转率为1.14(20毫米)的位置安装金字塔型消泡剂型扩散器,获得最接近均质的速度分布。从中心向上)。在中心距离比为0.35(距中心105mm)且中心挠度比为0.86(距中心向下20mm)的位置获得最小压降值。017(距中心5毫米的距离)和中心偏转率为1.14(距中心20毫米)。在中心距离比为0.35(距中心105mm)且中心挠度比为0.86(距中心向下20mm)的位置获得最小压降值。017(距中心5毫米的距离)和中心偏转率为1.14(距中心20毫米)。在中心距离比为0.35(距中心105mm)且中心挠度比为0.86(距中心向下20mm)的位置获得最小压降值。

更新日期:2020-06-11
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