Performance of local exhaust ventilation (LEV) using computational fluid dynamics (CFD) based on motor pulley adjustment of fan law

Chew, Jun Kai (2023) Performance of local exhaust ventilation (LEV) using computational fluid dynamics (CFD) based on motor pulley adjustment of fan law. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

Local Exhasut Ventilation (LEV) is an engineered control system used in manufacturing sector to capture any harmful airborne contaminant. LEV main purpose is to capture and release harmful contaminant to a safe place. It contain 5 main components, hood, ducting, air filter, fan, and exhaust. Numerous medical reports and case study since 1970s have shown exposing to welding fumes will cuase upper respitory symptoms, chronic bronshitis, asthma, Haemoptysis heart rate variablitiy and Basal Cell carcinorma (BCC). LEV systems that lack maintenance, for instance, dirty filters will cause low static pressure that will increase the load and reduce the efficiency and effectiveness of the system. This study aims to monitor and analyse the performance of LEV system using Computational Fluid Dynamic (CFD) based on adjustment motor pulley size based on fan law. A design layout drawing based on the layout in the PSM HVAC Laboratory is created using SolidWork CAD and a simulation is done using Ansys Fluent. Data such as air velocity, air flowrate, and static pressure will be measured real time in the Lab to conduct simulation for analysing the performance of the system. After collecting data from the lab, fan law is use to calculate the increament of static pressure and volume flow rate. According to the standard SPB motor pulley size, the suitable motor pulley size for this study are 118mm, 120mm, 125mm, 132mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm and 212mm. In Ansys Fluent, edge sizing and inflation meshing is used and the simulation is calculated in pressure-based with standard k-epsilon equation.The result shows the increasing of motor pulley size will increase the velocity and the motor horsepower. The increased of velocity slowed down after 160mm diameter motor pulley (less than 1%) and the horsepower required to run the next motor pulley size (170mm) is much higher (around 20% of increament) compare to the previous size. Therefore the, most suitable size for increasing the LEV system performance is 160mm diameter for motor pulley.

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