| Author: | Jia, Yifan |
| Title: | Fire hazards of thermoplastic drips-dripping ignition theory |
| Advisors: | Huang, Xinyan (BSE) |
| Degree: | M.Eng. |
| Year: | 2020 |
| Subject: | Fire testing Electric cables -- Testing Hong Kong Polytechnic University -- Dissertations |
| Department: | Department of Building Services Engineering |
| Pages: | ix, 70 pages : color illustrations |
| Language: | English |
| Abstract: | With the development of cities in recent years and the need for high-rise buildings, the fire caused by the dripping of thermoplastic drips is common. A pool fire is formed when molten drips attached flame fall from height and converge on a platform. In recent years, the researches and simulations of flame propagation on electric wire and building facade is hot topic. However, potential fire hazards behind this phenomenon have been found by very few people. In this work, an experimental study explains the fire hazards by quantified method. Laborotary electrical wire with four different sizes and priter paper with three thicknesses reveals quantified results. By igniting laborotary wires, molten single drip with four different mass, which are 2.6mg, 3.3mg, 4.6mg and 6.2mg, will land on and ignite paper samples, whose thinknesses are respectively 0.07mm, 0.15mm and 0.32mm. Through thousands of experimental tests, two common phenomenon have found: carnonized phenomenon (pyrolysis of paper and mass loss) and whitening phenomenon (a signal for critical heat gained by paper sample) on the landing point of paper sample. Meanwile, different limit ignition trend for three different-thickness paper sample can be observed in chart by using ignition probability (Pig=50%) as ignition. Finally, in scenario C (controlling mass of single drip is 4.6mg), the critical dripping frequency for three different-thickness paper sample was analysed by using thermocouples to measure upper and bottom surface temperature of paper sample. This work studies basic information of thermoplastic drips-dripping ignition theory. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 5330.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 4.75 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/10873