An integrated system simulation and correction process for duct design in the industrial building

Chen, Wenliang; Chiang, Ya-Mei

doi:10.1109/seanes.2012.6299567

Cited by 1 publication

(1 citation statement)

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“…T-method pursues both pressure equilibrium and the least life-cycle cost, which is well applied in some factory exhaust systems [9]. Tapered central duct or varied branch duct can be adopted in these exhaust systems [10][11][12] to adjust the major losses by differing the size of each duct section.…”

Section: Introductionmentioning

confidence: 99%

A novel flow-guide device for uniform exhaust in a central air exhaust ventilation system

Tong

Gao

Luo

et al. 2019

Building and Environment

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Exhaust ventilation system with one central fan and multiple terminals has been widely used for the heat and contaminant removal in building environment. Conventional design without pressure balancing leads to uneven distribution of exhaust airflow rate among the multiple outlets. Existed balancing methods usually uses dampers (constant-air-volume valve or regulating valve), tapered duct, or varied inlet area. However, these methods result in higher fan energy consumption, or complicated construction and on-site commissioning. In this paper, a flow-guide device was developed for adjusting the pressure distribution of duct branches. This new device is integrated with the interflow Tee-junction and does not need any commissioning or regulating. The resistance performance of the device responding to the structural parameter was derived using the CFD simulation and experiment. The negative direct resistance featured by the device was found to effectively benefit exhaust at the outlets farther away from the central fan. The ductwork hydraulic model based on the Bernoulli's law of airflow and the fitted resistance correlations were further proposed to fulfill the parametric design. Finally, full-scale test was carried out for a central exhaust system installed with the flow-guide devices referring to a factory workshop with 30 heat and contaminant sources. Compared to the system without the devices, the total rate of the system increased by 25%. Discrepancy of exhaust rate decreased by 78% and uneven degree decreased by 82%, which well meets the engineering balancing requirement. Meanwhile, total resistance of the system reduced 23.8% owing to the negative loss the devices bring.

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Section: Introductionmentioning

confidence: 99%