Heat Release Rate of an Open Kitchen Fire of Small Residential Units in Tall Buildings

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1 2014 Purdue Compressor/Refrigeration and Air Conditioning and High Performance Buildings Conference West Lafayette, IN, USA July 2014 Heat Release Rate of an Open Kitchen Fire of Small Residential Units in Tall Buildings Presented by Dr. N.K. Fong Associate Professor, Department of Building Services Engineering The Hong Kong Polytechnic University, Hong Kong, China Professor W.K. Chow Chair Professor of Architectural Science and Fire Engineering Director, Research Centre for Fire Engineering Head of Department, Department of Building Services Engineering The Hong Kong Polytechnic University, Hong Kong, China Founding President, Society of Fire Protection Engineers - Hong Kong Chapter President, Asia-Oceania Association for Fire Science and Technology PurUOKF1d.ppt 1

2 Topics covered: 1. Introduction 2. Open Kitchen 3. Possible Fire Phenomena 4. Earlier Works 5. An Example Case 6. Principle of Superposition 7. Conclusion 2

3 1. Introduction 3

4 Many highrise buildings packed together Victoria Harbour

5 Examples of New Residential Buildings Kowloon West The Arch (two 60-storey and two 54-storey residential building with 1,060 flats and a clubhouse at the 40/F) 5

6 Kitchen fire even at IFC Hong Kong : No Big Fires Just a little bit of LUCKS! Good training of firefighting Good implementation of fire codes 6

7 2. Open Kitchen 7

8 There are many open kitchens in small units less than 30 m 2 in area in tall residential buildings of height over 200 m in Southeast Asia including Hong Kong. 歐家櫥櫃設計公司 ANCHOR Kitchen Design Co. 8

9 9

10 There are fire risks due to cooking in a kitchen. Compliance of code? PBD-FEA applied. Only the spread of smoke from the kitchen fire to areas outside the unit was studied in FEA to work out ASET and RSET to staircases. 10

11 Cooking risk: still possible ignition of combustibles for induction cooker. Therefore, using electric induction cookers. Cut-off electricity system would work as expected? A recent experimental study reported that a fire can be started within ten minutes when frying food with cooking oil using the permitted electric induction cookers. 11

12 Problems in Tall Residential Buildings Tall building with small area. High fire load density. Over 1400 MJm -2 in tall residential buildings as surveyed recently. Easy to get a big fire affecting the structure! 12

13 Approaches in many FEA projects to watch: - Smoke movement + Evacuation - No big fire scenarios. - No experimental support. Must study differences in fire spread between the cases with and without the fire resisting wall. Full-scale burning tests are essential. Dry powder Water mist Compensation after big fires? would work to stop the fire quick enough as expected? 13

14 3. Possible Fire Phenomena 14

15 Normal Kitchen Fires In a normal enclosed kitchen fire, the maximum fire size is limited by the air supply rate through the openings. But the same cooking oil fire would grow in size rapidly with an adequate air supply in an open kitchen not enclosed by fire resisting walls. 15

16 Open Kitchen Fires All combustibles stored would be ignited following flashover providing a fire lasting for a long time. Big post-flashover fires in a flat would lead to serious consequences, and fire would also spread rapidly to other parts of the building. Fire physics in a residential unit to know! 16

17 4. Earlier Works 17

18 Although there has been much work on kitchen ventilation, thermal plumes, exhaust hoods and fire detection, very little were on kitchen fires. A fire originating from kitchen stoves in a twostorey duplex house was studied by fire models. The critical event was the onset of flashover in the kitchen. Fire spread to the entire house within one minute. 18

19 BFRL Workshop 2007 A workshop on residential kitchen fires was held at the Building and Fire Research Laboratory (BFRL), National Institute of Standards and Technology (NIST) in USA in Over 30 participants from professional societies, research laboratories, fire departments, insurance companies and others attended to discuss the existing test methods, technologies, and research and development on residential fire protection. Statistics for kitchen fires in USA was reported. 19

20 An average annual value of 125,500 home fires started in the kitchen, including confined cooking fires from 1999 to 2002, leading to an average of 460 deaths per year. Although 9% of the fires extended beyond the kitchen, 70% of fatalities were due to this small percentage of kitchen fires. This gives a warning signal to residential units with open kitchens. 20

21 Fire officers then summed up their firefighting experience, and suggested that installing a single sprinkler would control kitchen fires effectively. Residential range-top fire suppression systems have been proposed and tested by the Underwriters Laboratories Standards UL 300A. Studies on hazard mitigation of kitchen fires at BFRL, NIST were then reported. 21

22 Kitchen fire hazard characterization and the protection of typical cooking oil fires on stoves by both active and passive fire systems were studied using limited full-scale burning tests. Two points for further research were identified in this workshop : - protecting the kitchen fire from spreading; - suppressing the kitchen fire. 22

23 5. An Example Case 23

24 It is clear that protecting against open kitchen fires in small units of tall residential buildings is important. Urgent action is needed to understand the fire physics of open kitchens. A 30 m 2 residential unit with an open kitchen, which is common in Hong Kong, was taken as an example for in-depth studies); its floor plan is shown. The study relates to the Hong Kong environment, but the results are also applicable to other big cities in the Far East. 24

25 Bedroom Living room 6 m Residential flat with open kitchen, about 5 m x 6 m ~ 30 m 2 Bathroom 5 m An open kitchen design 25

26 The fire scenario in a residential unit depends on the amount of fuel, materials stored, storage arrangements and ventilation provisions. An earlier survey showed that the fire load in a small residential unit can be very high. It is proposed that the typical fire scenarios should be worked out by first understanding the combustible content. Fire load density and the arrangement of combustibles in 20 small residential units with open kitchens were surveyed. Ignition possibilities, including frying food with electric induction cookers, were investigated. 26

27 Bench-scale experiments studying cooking oil fires were reviewed and repeated. The possibility of the onset of flashover in residential units was analyzed based on empirical expressions reported in the literature. Upon the imposition of a high thermal radiation heat flux on all combustibles, the burning of combustibles under post-flashover fires in a small residential unit was studied. 27

28 The following two possibilities were studied in detail: An open kitchen design which provides sufficient air for combustion, and possesses no fire resisting walls to block heat and mass transfer. An enclosed design with glass walls without any fire resistance rating, which would easily lead to rapid heat accumulation and flashover. 28

29 Literature on modelling heat release rates for kitchen arrangements was taken as the starting point. The total heat release rate in a kitchen was first estimated using the principle of superposition, which combines the heat release rates curves of the furnishings and finishes deduced from a cone calorimeter. The results from full-scale burning tests were then used to model overall heat release rates when those kitchen combustibles were burnt. 29

30 6. Principle of Superposition 30

31 A more appropriate approach based on the reported heat release rate curves was proposed. The design fire can be deduced by combining the heat release rate curves measured while burning local products. Take an open kitchen with furniture, wardrobes and storage units as an example. 31

32 While furniture Q furn, wardrobes Q ward and storage units Q stor were burnt, the heat release rate curves were measured by an oxygen consumption calorimeter; the data was reported by NIST. Applying the principle of superposition, the total heat release rate in the open kitchen Q OK can be calculated by the following formula: Q OK =Q furn +Q ward +Q stor (1) Using the data reported in the literature as an example. 32

33 Example of estimating heat release rate in an open kitchen 33

34 The estimation by equation (1) is only an approximation. The heat release from the first object would affect the burning behaviour of the second object. The phenomenon is complicated, therefore, empirical relations from full-scale burning tests need to be derived and heat release rate curves Q furn,q ward and Q stor for local products should be measured after experiments. 34

35 Furthermore, the radiative heat flux is an important element for studying a post-flashover fire. Heat release rate curves measured by a cone calorimeter would be different under different radiative heat fluxes. Therefore, modelling heat release rate of the open kitchen by the principle of superposition with equation (1) is a very crude estimation. During the measurement of heat release rate by the oxygen consumption method, full-scale burning facilities must be used to justify the model. 35

36 7. Conclusion 36

37 Heat release rate in burning all combustibles in an open kitchen was studied in this paper. As a database on heat release rates for local combustible products is not yet available, estimations were only based on the principle of superposition; low radiative heat fluxes were assumed in most of the PBD projects, which are not supported by full-scale burning tests. Points to note in the estimation of probable heat release rates were discussed; these factors are recommended to be included in determining fire safety provisions by PBD. This is important for open kitchens in small units of tall residential buildings in the Far East, where fire load density can be extremely high. 37

38 Fire experiments with induction cookers Gas cooker and induction cooker 3500 W gas cooker 2600 W induction cooker 1600W induction cooker Reported separately! 38

39 Experimental setup 39

40 Acknowledgement The work described in this presentation was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China for the project Aspects of open kitchen fires in tall buildings and protection alternatives (PolyU 5136/11E) with account number B-Q27R. 40

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