Zoren Liu
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Zoren Liu
Senior Engineer — Tunnel Ventilation
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Zoren is a Senior Tunnel Ventilation Engineer with a wealth of professional experience spanning various tunnel projects, encompassing road, rail, metro, and utility sectors.
His expertise has been evident in prominent projects like the North East Link, M6, and Brisbane Metro, where he has showcased his proficiency in conducting advanced modelling and analyses in both 1-D (IDA Tunnel) and 3-D (FDS/PyroSim) regimes.
Zoren's contributions extend beyond analysis, as he has played a pivotal role in providing detailed designs for tunnel ventilation system space proofing and sizing on major infrastructure undertakings such as the Sydney Metro Western Sydney Airport and Mass Rapid Transit Jakarta projects. Leveraging his programming experience, Zoren has developed automation tools and scripts, augmenting his team's efficiency and bolstering the overall discipline's effectiveness. With his diverse skill set and extensive project experience, Zoren continues to be a valuable asset in delivering successful tunnel ventilation solutions across a spectrum of complex projects.
Project Highlights
Road Tunnel
North East Link (NEL)
Zoren conducted Tunnel Ventilation detailed design analysis works for the North East Link (NEL) project. He was responsible for determining the required TV system capacities, including the ventilation flow rates and jet fan numbers, through carrying out CFD modelling and analyses on IDA Tunnel. This is achieved by assessing the system's performance against various operating conditions such as air quality management during Normal Operation and smoke exhaust control during Emergency Operation.
Zoren showed Precision by determining required system capacities and ventilation flow rates through meticulous CFD modeling and analysis. He ensured Assurance by assessing system performance under various operating conditions to meet stringent air quality management and smoke exhaust control requirements.
Road Tunnel
M6 Stage 1
Zoren's involvement on M6 Stage 1 started during tender, where he performed 1-D tunnel ventilation analysis using IDA Tunnel. His role expanded in the subsequent design stages post tender where he was responsible for the delivery of the Tunnel Ventilation Analysis package.
At the start of the design phase, Zoren developed the modelling plan, which documented the scope of the analysis work as well as the associated SWTC requirements and modelling inputs. Subsequently, Zoren produced various calculations, reports, modelling and automation scripts contributing to the delivery of the package. These contributions include: 1) a traffic calculation spreadsheet to process the SMPM traffic data and transformed it to relevant profiles (expected, congested, etc); 2) a critical velocity calculation spreadsheet based on NFPA 502 (2014) for all unique tunnel sections; 3) 1-D modelling and analysis of all types of system operations using IDA Tunnel, including Normal, Emergency, Maintenance and Continued Operations; 4) leveraged Python and VBA programming abilities to expand upon automation scripts and tools to enhance the efficiency of data processing and visualisation; 5) assisted the Fire Engineering team with 3-D CFD analysis using FDS/PyroSim; and many more. From this experience, Zoren has gained knowledge in the operation of the TV system and responses, as well as furthered his understanding of the complexity in the interoperability of different tunnel networks (M6, M8, M4-M5 Link, RIC, and wider WCX). Additionally, Zoren's efforts in expanding the automation scripts and tool has greatly reduced the time required for the post-processing and visualisation of the analyses results.
Zoren performed 1-D tunnel ventilation analysis during tender and post-tender design stages for M6 Stage 1, showcasing Precision in developing modeling plans and delivering detailed analysis packages. His commitment to Assurance was evident in producing calculations, reports, and automation scripts to validate system performance and enhance efficiency.
Road Tunnel
Brisbane Metro
Zoren provided 1D modelling of the busway metro road tunnel network, including Adelaide St Tunnel, King Georges Station, Queen St Bus Station, on IDA Tunnel to simulate realistic conditions for normal, congested and emergency operating scenarios. Zoren created 3D model of the tunnel system using PyroSim/FDS to be used for CFD analysis to validate the tunnel ventilation in smoke control.
Zoren demonstrated Precision in simulating normal, congested, and emergency scenarios. He ensured Assurance by creating 3D models for CFD analysis to validate tunnel ventilation effectiveness and smoke control measures.
Road Tunnel
Western Harbour Tunnel & Beaches Link
Zoren performed post-processing and analysis of the traffic simulation results and looked at the distribution of concentration of air pollutants produced by the traffic, including carbon monoxide (CO) and nitrogen dioxide (NO2), under various operation conditions: normal, congested and breakdown.
Zoren analyzed traffic simulation results and air pollutant distribution under various operating conditions for the Western Harbour Tunnel & Beaches Link project, showcasing Precision in post-processing and analysis. His attention to Assurance ensured accurate assessment of ventilation system performance for safety and reliability.
Rail Tunnel
MRT Jakarta
Zoren worked on Mass Rapid Transit (MRT) Jakarta project during the tender design stage. He produced the spaceproofing design of ventilation systems for multiple underground stations: Sarinah and Monas in CP201 (2020); Kota and Glodok in CP203 (2021). Throughout the design process, Zoren maintained communication with architects and engineers located in the Singapore office for coordination. The design detailed the installation of tunnel ventilation system, over track exhaust system, under-platform exhaust system, and their associated sub-systems such as ducting. Initially, an optioneering study was performed to consider several plant room arrangements due to spatial constraints inside the station box. The plant rooms sizing and positioning were optimised iteratively through collaboration with the Singaporean project team. In addition, Zoren produced component schedules, which detailed the operation of the fans and dampers for various modes of operation, including normal, degraded and emergency.
Zoren provided ventilation system design for MRT Jakarta stations, demonstrating Precision in spaceproofing and system sizing. His collaboration with multidisciplinary teams showcased Ease in coordinating designs and optimizing plant room arrangements for efficient operation.
Rail Tunnel
Sydney Metro Western Sydney Airport
Zoren worked on the Sydney Metro project for the concept design of Western Sydney Airport line. Zoren provided design of tunnel ventilation system and over track exhaust system in multiple enclosed and semi-enclosed stations, including Orchid Hills East, St Marys, Airport Terminal, and Aerotropolis. During the design phase, Zoren collaborated closely with multiple disciplines to achieve an integrated design, including the Architects to ensure the proper sizing of the ventilation plant rooms and associated equipment, and the FLS team to coordinate the appropriate response & evacuation procedures during emergency. Following the design, Zoren co-produced 1-D models of the tunnel system on IDA Tunnel, including the tunnel ventilation fan plants and cross passages. The models were used to undertake a smoke management and control study to verify that smoke was able to be contained within the incident tunnel during emergency operation. Zoren also produced TVS schedules and created visualisations depicting the various modes of operations of the TV system, including normal, degraded and emergency. In addition, a generic tunnel section was also modelled in 3-D using FDS/PyroSim to compare the changes in standards as prescribed in NFPA 2014 and NFPA 2017.
Zoren contributed to concept design and modeling of tunnel ventilation systems for Sydney Metro Western Sydney Airport, highlighting Precision in developing design solutions and conducting smoke management studies. His efforts in producing visualizations and schedules reflected Ease in communicating system operations and design intent.
Utilities Tunnel
Changi T5 Megaspine Tunnels
The Megaspine tunnel system in the Terminal 5 upgrade consists of Baggage Handling System (BHS), Common Services Tunnel (CST) and Automated People Mover System (APMS). Zoren produced the detailed design of the tunnel ventilation system for the BHS and CST, as well as assisted with the design and modelling of the APMS. This was achieved through liaising closely with colleagues located in offices across the global, including the design team in Singapore and the Tunnel Ventilation team in London. The main goals of the TV system for BHS and CST were to provide temperature control during Normal and Degraded operations to maintain the safety and comfort of personnel (per Singaporean Workplace Safety and Health (WHS) Council regulations) and the performance of equipment within the tunnels, as well as smoke control during Emergency operation to support the firefighters. As a part of the design process, a benefit-detriment trade-off study was performed on the several TV systems considered, including longitudinal, semi-transverse and fully-transverse ventilation systems. The results of the study were submitted to the Fire Safety and Shelter Department (FSSD) in Singapore to justify the decision on selecting the longitudinal option. The TV systems were modelled in 1-D on IDA Tunnel to validate their effectiveness. In the 1-D analysis, the scenarios simulated include long-term (30 years), manned and unmanned normal operation and emergency. The results of the simulations determined the capacities of the TV fans, and the TV fan plant were sized based the capacities.
Zoren led the detailed design of tunnel ventilation systems for Changi T5 Megaspine Tunnels, ensuring Assurance through benefit-detriment trade-off studies and rigorous 1-D modeling. His collaboration with global teams demonstrated Ease in coordinating designs and delivering effective ventilation solutions.
Industrial
East Rockingham Waste to Energy
Zoren serves as the Interface Manager for the East Rockingham Waste to Energy project, ensuring Assurance through effective coordination and communication between stakeholders. His role involves facilitating Ease in project management and ensuring smooth interactions between teams to streamline the interface management process.
Additionally, Zoren also provides project commercial management, responsible for assisting the Project Manager to oversee the project’s financial health and resourcing outlook. His contribution plays a crucial role in minimising expenses, mitigating risks and improves upon the overall success of the project for his team and his clients.
