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Publications (10 of 21) Show all publications
Ochoterena, R. & Försth, M. (2018). The effect of thermochromic coatings of VO2 on the fire performance of windows. Fire and Materials, 42(7), 873-876
Open this publication in new window or tab >>The effect of thermochromic coatings of VO2 on the fire performance of windows
2018 (English)In: Fire and Materials, ISSN 0308-0501, E-ISSN 1099-1018, Vol. 42, no 7, p. 873-876Article, review/survey (Refereed) Published
Abstract [en]

The effect of thermochromic coatings of vanadium dioxide (VO2) on the fire performance of windows was experimentally tested. Prototypes were subjected to radiant heat and the radiation transmitted through the specimens was measured as a function of time. The results indicate that windows coated with VO2 can reduce radiative heat transfer from fires and thereby also reduce or prevent fire spread. The results clearly show that VO2coatings on BK7 substrates hinder approximately 30% of the transmission of radiation from fire sources when compared with the performance of uncoated windows. It is expected that VO2 will not be solely implemented for the purpose of increasing fire performance of windows, but it will rather provide a secondary positive effect if such windows are realized for energy‐saving purposes.

National Category
Other Materials Engineering Building Technologies Other Civil Engineering
Identifiers
urn:nbn:se:ri:diva-33937 (URN)10.1002/fam.2630 (DOI)2-s2.0-85047463692 (Scopus ID)
Available from: 2018-06-13 Created: 2018-06-13 Last updated: 2018-12-11Bibliographically approved
Ochoterena, R., Willstrand, O. & Försth, M. (2016). Electrosprays for fire suppression.
Open this publication in new window or tab >>Electrosprays for fire suppression
2016 (English)Report (Other academic)
Abstract [en]

A continuous current with a potential ranging between 10 and 30 kV was applied to a single-hole nozzle for modifying the properties of the generated water spray. The nozzle produced a full-cone spray by injecting water into quiescent air at atmospheric conditions varying the injection pressure between 0.2 and 0.6 MPa. Back-illuminated photography and laser-based holography were used for recording the effect of the electrical current on spray properties such as cone angle and droplet sizes. Results from this study indicate that applying a potential above 20 kV yields wider cone angles, more homogenously distributed spray patterns, and reduced droplet sizes than non-assisted sprays.Key words: electrosprays, water mist

Publisher
p. 20
Series
SP Rapport, ISSN 0284-5172 ; 2016:15
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-28002 (URN)978-91-88349-19-4 (ISBN)
Available from: 2017-02-07 Created: 2017-02-07 Last updated: 2018-08-16Bibliographically approved
Ochoterena, R., Roux, F., Sandinge, A., Nylander, C., Björnstig, U. & Skrifvars, M. (2016). Post-collision fires in road vehicles, a pre-study.
Open this publication in new window or tab >>Post-collision fires in road vehicles, a pre-study
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2016 (English)Report (Other academic)
Series
SP Rapport, ISSN 0284-5172 ; 2016:55
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-619 (URN)978-91-88349-57-6 (ISBN)
Available from: 2016-06-29 Created: 2016-06-29 Last updated: 2018-07-09Bibliographically approved
Willstrand, O., Svensson, R., Försth, M. & Ochoterena, R. (2016). Spray diagnostics using holography and wavelet analysis.
Open this publication in new window or tab >>Spray diagnostics using holography and wavelet analysis
2016 (English)Report (Other academic)
Abstract [sv]

In-line holography, where the reference beam coincides with the beam that is scattered against the droplets, has been found to be a versatile and simple experimental method for spray diagnostics using holography. Such an experiment was setup and a water spray was studied and holograms of high quality was obtained using a CCD-camera.

The holograms were analysed with Wavelet analysis, implemented as a Matlab program. It was found that the droplets’s size and position could be reconstructed with reasonable accuracy. Future work will focus on a dynamic analysis program that dynamically adapts the wavelet analysis parameters to each detected droplet.

Key words: spray diagnostics, laser diagnostics, holography, image processing, wavelet analysis

Publisher
p. 23
Series
SP Rapport, ISSN 0284-5172 ; 2016:49
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-27997 (URN)978-91-88349-51-4 (ISBN)
Available from: 2017-02-07 Created: 2017-02-07 Last updated: 2018-08-16Bibliographically approved
Willstrand, O., Brandt, J., Karlsson, P., Ochoterena, R. & Kovacevic, V. (2015). Fire detection & fire alarm systems in heavy duty vehicles: WP2 – Factors influencing detector performance in vehicles (ed.). Paper presented at .
Open this publication in new window or tab >>Fire detection & fire alarm systems in heavy duty vehicles: WP2 – Factors influencing detector performance in vehicles
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2015 (English)Report (Refereed)
Series
SP Rapport, ISSN 0284-5172 ; 2015:77
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-5292 (URN)29463 (Local ID)978-91-88001-98-6 (ISBN)29463 (Archive number)29463 (OAI)
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2018-07-09Bibliographically approved
Svensson, R., Ochoterena, R. & Försth, M. (2015). Spraystimuleringar i FDS (ed.). Brandposten (53), 16-17
Open this publication in new window or tab >>Spraystimuleringar i FDS
2015 (Swedish)In: Brandposten, no 53, p. 16-17Article in journal (Other (popular science, discussion, etc.)) Published
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-8275 (URN)30683 (Local ID)30683 (Archive number)30683 (OAI)
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2018-08-16Bibliographically approved
Svensson, R., Lindström, J., Ochoterena, R. & Försth, M. (2014). CFD simulations of the Cutting extinguisher (ed.). Paper presented at .
Open this publication in new window or tab >>CFD simulations of the Cutting extinguisher
2014 (English)Report (Refereed)
Abstract [en]

Developing tactics for extinguishing fires located in civil structures is needed. Nowadays, the most commonly procedure employed by most fire brigades when extinguishing fires located in the interior of buildings, consists in sending a unit of firefighters inside the structure spraying water on the surface of the burning fuels. This procedure has enormous caveats since it leads to the unavoidable necessity of exposing personal to situations where risks to their personal safety are major. An alternative to these tactics consists on using the Cutting extinguisher which in principle allows combating a fire by injecting water mist into the burning building without the necessity of entering it. This work studies the capabilities and limitations of the Cutting extinguisher when used for fire-fighting activities in conventional and idealised civil structures by the aid of computerised simulations and experimental data. The simulations were done using Fire Dynamics Simulator (FDS) which is an open-source code for modelling well-ventilated fires while experimental data was obtained from idealised and controlled fires and experiments. Findings of this study suggest that the Cutting extinguisher is effective for combating fires of moderated size in confinements using less water than traditional methods by reducing the relative concentration of oxygen in the room instead of by cooling the fuels as traditional methods do. The high velocity of the jet induces mixing in the confinement, enhancing the interaction of droplets with hot combustion products and promoting the vaporisation of the injected water. Furthermore, the induced momentum to the gases in the room together with the vaporisation of the injected water reduces the overall gas temperature inside the structure.

Series
SP Rapport, ISSN 0284-5172 ; 2014:43
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-5199 (URN)16539 (Local ID)978-91-87461-86-6 (ISBN)16539 (Archive number)16539 (OAI)
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2018-08-16Bibliographically approved
Ochoterena, R., Willstrand, O., Brandt, J. & Försth, M. (2014). Detection of fires in Heavy Duty (HD) vehicles (ed.). In: Proceedings from 3rd International Conference on Fire in Vehicles - FIVE 2014: . Paper presented at 3rd International Conference on Fire in Vehicles - FIVE 2014.
Open this publication in new window or tab >>Detection of fires in Heavy Duty (HD) vehicles
2014 (English)In: Proceedings from 3rd International Conference on Fire in Vehicles - FIVE 2014, 2014, , p. 201-207Conference paper, Published paper (Other academic)
Publisher
p. 201-207
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-12394 (URN)18889 (Local ID)18889 (Archive number)18889 (OAI)
Conference
3rd International Conference on Fire in Vehicles - FIVE 2014
Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2018-08-16Bibliographically approved
Willstrand, O., Brandt, J., Ochoterena, R. & Försth, M. (2014). Detection of fires in Heavy Duty (HD) vehicles (ed.). In: Proceedings from 15th International Conference on Automatic Fire Detection - AUBE´14: . Paper presented at 15th International Conference on Automatic Fire Detection - AUBE´14.
Open this publication in new window or tab >>Detection of fires in Heavy Duty (HD) vehicles
2014 (English)In: Proceedings from 15th International Conference on Automatic Fire Detection - AUBE´14, 2014, , p. 171-178Conference paper, Published paper (Refereed)
Publisher
p. 171-178
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-12421 (URN)19178 (Local ID)19178 (Archive number)19178 (OAI)
Conference
15th International Conference on Automatic Fire Detection - AUBE´14
Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2018-08-16Bibliographically approved
Ochoterena, R. & Hjohlman, M. (2014). Detection of fires in the engine compartment of heavy duty vehicles, a theoretical study (ed.). In: SAE 2014 World Congress and Exhibition;: . Paper presented at SAE Technical Papers, SAE 2014 World Congress and Exhibition; Detroit, MI; United States; 8-10 Apr., 2014.
Open this publication in new window or tab >>Detection of fires in the engine compartment of heavy duty vehicles, a theoretical study
2014 (English)In: SAE 2014 World Congress and Exhibition;, 2014, , p. 423Conference paper, Published paper (Other academic)
Publisher
p. 423
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-12464 (URN)23698 (Local ID)23698 (Archive number)23698 (OAI)
Conference
SAE Technical Papers, SAE 2014 World Congress and Exhibition; Detroit, MI; United States; 8-10 Apr., 2014
Available from: 2016-09-13 Created: 2016-09-13 Last updated: 2018-07-09Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-4687-9554

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