Predicting the Activation Time of a Concealed Sprinkler

dc.contributor.authorSuen, Yeou Weien
dc.date.accessioned2015-05-12T02:51:58Z
dc.date.available2015-05-12T02:51:58Z
dc.date.issued2015en
dc.description.abstractThis research examined a heat transfer model to predict the activation time of a concealed sprinkler. Concealed sprinklers consist of two stages of activation. They include the release of cover plates from a recess housing and the breakage of the glass bulbs or melting of the solder links. The research analysis is divided into two sections. The first section includes the prediction of cover plate activation time (stage one) and the second section includes the prediction of glass bulb activation time (stage two). Each prediction result is compared with the experimental data conducted by Annable (2006) and Yu (2007). A lumped heat capacity method is introduced to predict the activation time of the cover plate. This method has been used for predicting the activation time of a standard pendent exposed sprinkler. It is reasonable to apply this method by assuming they are flush with the ceiling. The analysis results are compared based on the percentage of predicted and measured uncertainties. A recommendation is provided for which method is appropriate to apply to predicting the cover plate activation time. The proposed of using FDS5 simulations is to simulate the heat transfer to the sensing element (glass bulb only) within the recessed housing. The constructed simulation models comprises of ceiling within a compartment. The simulations of various sprinkler heads are performed to investigate any parameters that can potentially affect the activation time of the sprinklers. To simulate the glass bulb, combined thermal properties including glass and glycerine are modified to account for the differences in mass. Prior to stage two analysis, the FDS5 simulation was tested to predict the activation time of a standard pendent exposed sprinkler. The results showed positive progress to carry onto the next analysis. In stage two analysis, the simulations are constructed with and without the presence of vent holes within the recess housing. The combined activation time for concealed sprinklers show lack of solid predictions compared to the experimental data especially Yu experimental data.en
dc.identifier.urihttp://hdl.handle.net/10092/10402
dc.identifier.urihttp://dx.doi.org/10.26021/3377
dc.language.isoen
dc.publisherUniversity of Canterbury. Department of Civil and Natural Resources Engineeringen
dc.relation.isreferencedbyNZCUen
dc.rightsCopyright Yeou Wei Suenen
dc.rights.urihttps://canterbury.libguides.com/rights/thesesen
dc.subjectconcealed sprinkleren
dc.subjectactivation timeen
dc.subjectpredicten
dc.titlePredicting the Activation Time of a Concealed Sprinkleren
dc.typeTheses / Dissertations
thesis.degree.disciplineFire Engineering
thesis.degree.grantorUniversity of Canterburyen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Engineering in Fire Engineeringen
uc.bibnumber2107276
uc.collegeFaculty of Engineeringen
Files
Original bundle
Now showing 1 - 2 of 2
Loading...
Thumbnail Image
Name:
Thesis_fulltext.pdf
Size:
3.61 MB
Format:
Adobe Portable Document Format
Loading...
Thumbnail Image
Name:
Suen_Y_Use_of_thesis_form_2015.pdf
Size:
80.16 KB
Format:
Adobe Portable Document Format