ISO 9705 Large Size Fire Heat Release Rate Measurement

ISO 9705 Large Size Fire Heat Release Rate Measurement

1. Experimental purposes

1) Test materials’ heat release rate, smoke generation amount, smoke generation rate and other indicators;

2) Evaluate the combustion characteristics of materials under actual large-scale fires;

3) Evaluate Australia’s AS5637.1 Group 1/2/3/4 fire protection level

2. Experimental system and principles

The experimental device consists of four parts, including a combustion chamber, a flue gas collection and sample gas collection system, a gas analysis and data processing system, and a gas supply system. The fire standard experimental room is (3.5±0.05) meters long, and the width and height are (2.4±0.05) meters. A room with a width of (0.8±0.01) meters and a height of (2.0±0.01) meters is opened in the middle of the width direction. Door. The room is constructed of red brick cement and lined with gypsum (or calcium silicate) wall panels with a thickness of not less than 13 mm.

The experiment is based on the principle of combustion oxygen consumption, analyzing the heat release generated by combustion, measuring the total heat flow through a heat flow meter set in the center of the ground, and estimating the possibility of the flame spreading from the ignition source to other objects in the room; by measuring the total heat release of combustion Rates to estimate the likelihood of flames spreading to objects outside a room; Measures of certain toxic gases to determine the hazard of reduced visibility; Photographs and videos are used to record the growth of flames.

3. The necessity of ISO9705 large-size physical room testing

Most of the methods used for fire scientific research in laboratories are small-scale, and fires are exothermic phenomena with considerable heat release scales. Many test models built based on the same principles can be used for material evaluation, but establishing a model that simulates the actual situation as much as possible Standard test methods for fire are necessary to evaluate the reliability of laboratory method data. In a room, a fire source placed in the corner is considered to be the most dangerous possibility. The ISO9705 large-size room angle test is considered to be very similar to actual fire conditions, so the ISO9705 large-size room angle test is very necessary for high-risk materials and places.