Tunnel ventilation desin - CFD and PyroSim Simulation

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Tunnel ventilation design and calculation by PIARC method

In recent years Contemporaneous with the advancement of technology, special consideration needs to transport infrastructure has been raised. One of the main methods of transportation is road and rail transportation. The main feature of these methods of transportation is their generality, which requires special attention to details of design and construction.

Iran also has developed tunnel-digging recently issues related to tunneling, which has been of particular importance and the Resalat tunnel in Tehran, the first tunnel ventilation design project and control system was undertaken.

Design and Simulation of road/rail tunnel ventilation

Design and simulation of industrial ventilation

Metro Ventilation Design and Simulation

Longitudal tunnel ventilation system using Jet-Fans

Design and Simulation of road and rail tunnel ventilation

The new drilling techniques and TBM devices have led to the possibility of digging long tunnels in less time than usual. One of the requirements for digging long tunnels is proper ventilation. The most common method of urban tunnel ventilation is longitudinal ventilation using jet fans.

To cause proper and healthy ventilation in tunnels, additional equipment, correctly design, and detailed calculations of pollutants and environmental conditions are needed.

 

 

To carry out tunnel ventilation computing feasibility studies, some processes must be performed regularly and in a particular order. To basic acquaintance with the tunnel ventilation calculation process, the main steps of the process, will be mentioned as followed:
- Finding out technical drawings and geographical position of the tunnel
- Studying the Climatic traffic characteristics of the region and view
- Studying the status of pollutants produced by vehicles and analysis of traffic statistics
- Calculations to determine the required flow rate for ventilation in traffic and fire mode
- Studying different methods of ventilation and selection of the appropriate method
- Flow simulation inside tunnels with Fluent, SES, and flow works software
- Figuring out all ventilation equipment’s on the chosen method, along with Technical Specification
Araco by having the suitable knowledge, work experience in the field of tunnel ventilation and utilizing Finite element flow simulation techniques is present to carry out projects in road and rail tunnel ventilation design with high certitude and quality.

 

Click here to read more about Pyro sim - PyroSim and CFD Simulation

 

Parking (Car park) Ventilation by Jet Fan

Construction and operation of commercial and office complex are highly booming, according to the optimal use of existing spaces in major cities. Due to the compression of space in such complexes, parking’s are designed with the assumption to use the most space possible. With large numbers of cars in car-park and enclosed spaces, it will be certainly necessary to design a very powerful ventilation system.
Design and implementation of the ventilation system are necessary for enclosed parking and car park, because of vehicle density. During normal operation in a car park, vehicles produce pollutant gases like carbon monoxide and NOx may cause serious damage to people inside the parking lot. There is also another risk in car parks, which is the possibility of fire. Considering the enclosed area inside the parking’s, the Incidence of fire will produce deadly gases and a huge amount of smoke. According to this situation, parking ventilation systems must have the capability to control the smoke and deadly gases and provide the required time for people to escape from danger. 

Air flow diagram inside a parking 

The old method for parking ventilation was using ventilation ducts in the roof. This method causes many limits in design and operation and in a fire situation, ventilation was not good enough.
New technology in this field is the application of jet fans for normal ventilation and smoke extraction in case of fire in parking. In fact, this technology represents the most innovative and cost-effective alternative to traditional ducted mechanical extraction systems. Carefully managing the project in all its development stages, which requires the fundamental use of fluid dynamics calculation programs - CFD - and also ensures that the system is working correctly. The jet Fan system provides either normal ventilation and can also be provided for smoke extract in case of fire in the parking lot.
After the final design, the performance of the jet fan can be evaluated using CFD in normal operation. Also by using PyroSim and FDS software the function of the installed jet fan could be tested during a simulated fire.
PyroSim is a graphical user interface for the Fire Dynamics Simulator (FDS). PyroSim helps companies to create and manage the details of complex fire models.

Car park ventilation-CFD simulation result- Air speed plot

PyroSim and FDS are both using as main software to simulate the fire reaction in different environments like buildings, parking lot, Car park, Subway, Tunnel, Cinema, Commercial office complex, and …
Using PyroSim we could define smoke detectors and sprinklers in a 3D model, in order to examine the current design in case of fire with both software.

 

 

ARA Co

Car park (parking) Ventilation Design 

Tunnel ventilation design

Parking CFD projects 

Fire simulation project using PyroSim (FDS) for Tunnel, Parking lot, Stadium and ....

Website: http://araco.ir/en

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Tunnel ventilation and Industrial ventilation : http://tunnel-industrial-ventilation.blog.ir/page/Tunnel-Ventilation-design-Pyrosim-CFD-project

HVAC and Ventilation CFD

CFD - Computational Fluid Dynamics - CFD Simulation and Analysis Project

In continuum mechanics, fluid mechanics to form one large branch. Fluid mechanics begins with the same principles of solid mechanics, but what distinguishes them from one another, this is a fluid unlike solids are not able to withstand shear stress. Knowing this, it is planned equations for fluid motion analysis. This equations to respect both the British and the French mathematician called Navier-Stokes equations. CFD - Computational Fluid Dynamics - in fact is solve the Navier-Stokes equation for the small size of the original model. In this way the total desired volume is divided into very small volumes in operation meshing and after applying the boundary conditions, the equation is solved for all elements. 

CFD has been playing an increasingly important role in HVAC and ventilation, following its continuing development for over a quarter of a century. The information provided by CFD can be used to check the impact of building exhausts to the environment, to predict smoke and fire risks in buildings, to quantify indoor environment quality, and to design natural ventilation systems.

CFD application in HVAC and ventilation can be classified as:

·        CFD analysis for air conditioning in Buildings, Stadium, Cinemas, Hotel, Hospital and …

·         CFD simulation for HVAC inside Server room and Data center

·         CFD simulation for air conditioning inside class room and companies

·         CFD simulation inside tunnel and metro stations

·         CFD simulation inside parking lot and multi floor parking

·         CFD application for indoor farming ventilation

 

ARA Co -Mohammad Ghorbanalibeik

HVAC CFD projects

air conditioning CFD projects

Pyrosim and FDS project

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