Heat Transfer Mechanism and Fireproof Characteristics of a Steel Roller Shutter with Flowing Water Film

Abstract

This study investigates fire protection performance and the effect of installation of a general roller shutter with an embedded perforated straight pipe a as the water film cooling system The objective of this study was to endow general roller shutters with the fire insulation ability of a fire-proof roller shutter The thesis is divided into two sections: The full-scale experiment involving a roller shutter with water film cooling system and a numerical simulation with the two-dimension hybrid inverse heat conduction scheme In the full-scale experiment part three experiments were conducted to investigate the methodologies of roller shutters with a water cooling system Cold-flow and heat-resistance experiments were carried out to evaluate the water film performance of the perforated pipe on the shutter surface and to verify the fire insulation efficacy of a roller shutter featuring a water film; all experiments were performed via the full-scale heating furnace located in the Architecture and Building Research Institute (ABRI) The startup of water film cooling system was timed to determine the activation time of the water film cooling system when the roller shutter encounters a fire event However the temperature distribution on the hot side is not easily determined using direct experimental methods due to the extreme heat Thus in the present study the average heat transfer coefficient the heat flux and the temperature on the hot side are computed using a hybrid inverse heat conduction scheme based on experimental temperature measurements acquired on the cold side Numerical simulations are performed to investigate the heat transfer characteristics on both sides of the roller shutter with and without the down-flowing water film respectively The result indicates that the water film cooling system effectively enhances the fire insulation of the roller shutter and presents the maximum temperature and temperature difference are below the breakage limit

Date of Award	2014 Jul 5
Original language	English
Supervisor	Ta-Hui Lin (Supervisor)