Abstract
Chimneys convey exhaust gas produced in domestic heat appliances to the external environment and to do this they have to pass through elements such as roofs and floors. If these elements are made up of flammable materials the fire hazard may occur. In some European countries the number of roof fire is very high and they affect also certified chimneys, that is, tested following the prescription of the related standards. The aim of this paper is to highlight that the certification procedure does not allow to test chimneys in the worst condition, therefore, chimney installed following the manufacturer prescriptions may in some cases cause the overheating and subsequent roof fire. To do this, experimental tests have been performed for measuring the temperature on roofs in the vicinity of a certified chimney. The results show that the certification procedure should be revised.
Highlights
The overheating of flammable materials due to the presence of a chimney has been analyzed in the past for determining the temperature of the outer surface of the chimney [1,2,3,4] and to define safety distances for preventing the burning of structural elements [4,5,6,7]
The fact that the measured temperatures are higher than 85°C can be due to three causes: the roofs used in this experimental campaign are thicker than those prescribed by the standard [8], the clearance has been closed in different ways than those adopted in the certification procedure and, installing the chimney at the center of a roof represents a worst condition than that doi:10.1088/1742-6596/655/1/012019
In this paper differences between the condition in the certification procedure prescribed by the standard [8] and the condition in real installations have been experimentally shown
Summary
The overheating of flammable materials due to the presence of a chimney has been analyzed in the past for determining the temperature of the outer surface of the chimney [1,2,3,4] and to define safety distances for preventing the burning of structural elements [4,5,6,7]. The standard [8] prescribes the heat stress test and the thermal shock test by means of which the distance to be respected between chimney and flammable materials is determined. The heat stress test, analyzed in this paper, consists in installing the chimney to be certified in a structure following the manufacturer prescriptions, in producing exhaust gas at a predetermined temperature and in measuring the temperatures on the test structure until the achievement of the final test condition.
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