STANDARD
PD CEN/TR 16988:2016
Issue date: 2016 08 31
Estimation of uncertainty in the single burning item test
1.1 General
The measuring technique of the SBI (single burning item) test instrument is based on the observation that in general the heats of combustion per unit mass of oxygen consumed are approximately the same for most fuels commonly encountered in fires (Huggett [12]). The mass flow together with the oxygen concentration in the extraction system suffices to continuously calculate the amount of heat released. Some corrections can be introduced if CO 2 CO and/or H 2O are additionally measured.
1.2 Calculation procedure
1.2.1 Introduction
The main calculation procedures for obtaining the HRR and its derived parameters are summarized here for convenience. The formulas will be used in the following clauses and especially in the clause on uncertainty.
The calculations and procedures can be found in full detail in the SBI standard [1].
1.2.2 Synchronization of data
The measured data are synchronized making use of the dips and peaks that occur in the data due to the switch from ‘primary’ to ‘ main’ burner around t = 300 s i.e. at the start of the thermal attack to the test specimen. Synchronization is necessary due to the delayed response of the oxygen and carbon dioxide analysers. The filters long transport lines the cooler etc. in between the gas sample probe and the analyser unit cause this shift in time.
After synchronization all data are shifted so that the ‘main’ burner ignites - by definition - at time t = 300 s.
1.2.3 Heat output
1.2.3.1 Average heat release rate of the specimen (HRR 30s)
A first step in the calculation of the HRR contribution of the specimen is the calculation of the global HRR. The global HRR is constituted of the HRR contribution of both the specimen and the burner and is defined as
[Formula removed.]
where
| HRR total (t) | is the total heat release rate of the specimen and burner (kW); |
| E | is the heat release per unit volume of oxygen consumed at 298 K = 17 200 (kJ/m3); |
V General information on PD CEN/TR 16988:2016
Format
Digital | 58 Pages
Language
English
Publisher
British Standards Institute
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Standard
PD CEN/TR 16988:2016
- Estimation of uncertainty in the single burning item test
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