Jet-fan systems effectively control smoke in car parks by creating directed airflows that transport smoke from one point to another, similar to how longitudinal ventilation works in tunnels. These systems offer cost-effectiveness and simplicity by eliminating ductwork while providing powerful smoke management capabilities when properly designed and understood.

• Jet Fans create momentum transfer through air entrainment rather than directly moving smoke
• Two distinct operational modes exist: smoke clearance (reducing thermal stress) and smoke control (maintaining clear firefighter access)
• Systems require careful balancing of extraction capacity with Jet Fan thrust force
• Optimal design typically requires CFD modeling followed by hot smoke testing for verification
• Jet Fan activation timing presents challenges for evacuation - usually delayed until occupants exit
• Systems excel in tunnel-like geometries but struggle with complex layouts (the "Tetris rule")
• Particularly effective against heavier-than-air gases like LPG or EV battery fire emissions
• European standards now available through EN 12101 family for design guidance

If you need design assistance with Jet Fan systems for your projects, email me directly at w.wegrzynski@itb.pl.

Further reading:

- Jet-Fan Systems in Car Parks Design Methods: an Overview and Assessment of Performance

- Our in-depth multiparametric study on car park ventilation

- A. Król and M. Król, Study on numerical modeling of jet fans

- Thunderhead's guide to modelling jet-fans in FDS

Fire Science Show has been named the top podcast in Fire Protection and Safety by Feedspot. Check the list below, and you will also discover a lot more podcasts in our space!

https://podcast.feedspot.com/fire_protection_and_safety_podcasts/

Thank you for your continuous support, and to the OFR for making it possible to create this content!

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The Fire Science Show is produced by the Fire Science Media in collaboration with OFR Consultants. Thank you to the podcast sponsor for their continuous support towards our mission.

This episode explores the invaluable contributions of community participation in fire safety technical committees. Joining committees is not just about sharing expertise; it’s a journey that transforms careers and fosters growth. Our guests, Birgitte Messerschmidt and Kees Both, reveal how their experiences in various committees, including the NFPA, ISO, ASTM and CEN, have shaped their professional paths.

As we dive deeper into the intricacies of committee politics, our guests candidly share the challenges and rewards of engaging in this important work. They emphasize how participating in committees enhances one's career and contributes to the greater good by improving fire safety standards. This is an essential discussion for any engineer, especially those starting their careers, as they navigate the complexities of working with diverse stakeholders.

If you just felt inspired to join a committee, please look here:

• https://www.sfpe.org/membership-communities/standingcommittees
• https://www.nfpa.org/for-professionals/codes-and-standards/standards-development/technical-committees/committees-seeking-members
• https://www.cencenelec.eu/get-involved/small-and-medium-enterprises-smes/tools-for-smes/getting-involved/

Or just shoot us an email, or reach out at LinkedIn. We will help you out!

Fire Science Show has been named the top podcast in Fire Protection and Safety by Feedspot. Check the list below, and you will also discover a lot more podcasts in our space!

https://podcast.feedspot.com/fire_protection_and_safety_podcasts/

Thank you for your continuous support, and to the OFR for making it possible to create this content!

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The Fire Science Show is produced by the Fire Science Media in collaboration with OFR Consultants. Thank you to the podcast sponsor for their continuous support towards our mission.

With the emergence of electric vehicles, fire safety and dynamics have entered a new domain, raising crucial questions about existing protocols, design fires and data gaps. Today, our Wojciech Wegrzyński welcomes Zahir, Associate Prof. at University Putra Malaysia, to discuss the findings from their latest papers, compare methodologies, and highlight the differences between traditional combustion engines and electric vehicles.

The conversation covers various topics, from the nuances of fire dynamics to the importance of context in risk assessment. Zahir shares his extensive experience studying vehicle fires, including the evolution of electric vehicle dynamics that users should never ignore. With thought-provoking insights, this episode emphasises the increasing need for robust, comprehensive data regarding car fires and the unique challenges posed by electric vehicles.

Join us in this engaging exploration of fire safety science, and don't forget to subscribe, share, and leave a review!

Papers! PAPERS:

Miechówka & Węgrzyński: Systematic Literature Review on Passenger Car Fire Experiments for Car Park Safety Design

Zahir & César Martín-Gómez: Evaluating Fire Severity in Electric Vehicles and Internal Combustion Engine Vehicles: A Statistical Approach to Heat Release Rates

Podcast episode 135 - Contemplating a car park design fire

(and the paper by J. Hodges from last year is here)

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Badania przedstawione w odcinku podcastu omawiane przez dr Wojciecha Węgrzyńskiego przeprowadzono w projekcie realizowanym an podstawie umowy UMO-2020/37/B/ST8/03839 do projektu badawczego nr 2020/37/B/ST8/03839 pt. Skutki oddziaływania wiatru na pożary budynków w wieloparametrycznej ocenie ryzyka z wykorzystaniem metod numerycznych.

Fire Science Show has been named the top podcast in Fire Protection and Safety by Feedspot. Check the list below, and you will also discover a lot more podcasts in our space!

https://podcast.feedspot.com/fire_protection_and_safety_podcasts/

Thank you for your continuous support, and to the OFR for making it possible to create this content!

----
The Fire Science Show is produced by the Fire Science Media in collaboration with OFR Consultants. Thank you to the podcast sponsor for their continuous support towards our mission.