The oxygen consumption calorimetric method is generally used to measure the heat release rate (HRR) of combustible items. However, this method might yield uncertain results in gas concentrations when water is being discharged, such as from a sprinkler head. In this study, we attempt to devise an appropriate and simple method for measuring HRR during water discharged. A relation between HRR under free-burning conditions, which is calculated from the mass loss rate, and the radiative heat flux are evaluated experimentally. The radiative heat flux during water discharge to take into account, Mie theory is applied to estimate radiative attenuation via absorption by water droplets. The effect of water droplets is verified by experimental data.
Current Japanese building standards dictate that with regard to fire protection for the exterior façade walls of buildings, the only matter for consideration is “fire-resistive performance,” which is constituted of stability, integrity and insulation. There are no evaluations of fire propagation along combustible material installed on the external sides of walls, even though combustion of external cladding could cause accelerated fire propagation along exterior façade walls. In this study, the authors have proposed a test method for evaluation of fire propagation along combustible cladding, and test specimens produced in reference to façade walls with exterior thermal insulation were burned in order to demonstrate the application of the method.