1 Introduction
2 Evaluation Criteria
3 The Tool COMET
Measured variable in [5] | \({\tilde{U }}_{E}\) | \({\tilde{U }}_{M}\) | Reference to measured variables for this study (sensor group), see Table 5 |
---|---|---|---|
Hot gas layer temperature | 0.10 | 0.10 | TG_L1_YY and TG_L2_YY; YY = NW, SE, NE, SW, and CC (only for L2) |
Ceiling jet temperature | 0.10 | 0.10 | TG (height = 390 cm) not evaluated in this study |
Plume temperature | 0.10 | 0.10 | TG_L1_FP |
Gas concentrations | 0.01 | 0.15 | O2, CO, CO2 |
Smoke concentration | 0.28 | 0.26 | Not evaluated in this study |
Room pressure rise | 0.20 | 0.42 | Not evaluated in this study |
Surface/target temperature | 0.10 | 0.10 | TP, TCR, TCA |
Heat flux density | 0.10 | 0.20 | FLT |
-
For all sensors (points) in this graphic lying in the intersection of the green and red area, model and experiment fit well with respect to both criteria; NED and PEAK.
-
For all sensors (points) in this graphic lying within the green but outside red area, model and experiment fit well with respect their PEAK values but differ significantly with respect to their overall structure (and vice versa for points within the red but outside the green area).
-
If the sensor points are located in the white area, there are doubts on the validity of the model.
-
For sensors behaving as described in the latter two bullet points, a deeper analysis is advisable, e.g. using the actual plots of modeled and measured results as displayed in our Fig. 1.
4 OECD/NEA PRISME DOOR Experiments
4.1 Experimental Setup
4.2 Room Geometry and Ventilation
Test | Pool area | Air exchange rate |
---|---|---|
PRS_D3 | 0.4 m2 | 4.7 1/h or 560 m3/h |
PRS_D4 | 0.4 m2 | 8.4 1/h or 1000 m3/h |
PRS_D5 | 1 m2 | 4.7 1/h or 560 m3/h |
4.3 Fire Source
Parameter abbreviation | Parameter | Value |
---|---|---|
MW_FUEL | Molecular weight of fuel [g/mol] | 170 |
NU_O2 | Stoichiometric coefficient for O2 | 18.5 |
NU_CO2 | Stoichiometric coefficient for CO2 | 12 |
NU_H2O | Stoichiometric coefficient for H2O | 13 |
RADIATIVE_FRACTION | Amount of heat emitted by flames as thermal radiation | 0.35 |
EPUMO2 | Heat released per unit mass O2 [kJ/kg] | 12 700 |
CO_YIELD | Carbon monoxide yield | 0.011 |
SOOT_YIELD | Soot yield | 0.041 |
4.4 Materials
Material | Conductivity | Density | Specific heat | Thickness | Emissivity |
---|---|---|---|---|---|
λ [W/mK] | ρ [kg/m3] | cp [kJ/kgK] | d [m] | ε | |
Concrete (room L1 and L2) | 1.78–0.80 | 2 240 | 0.870–0.317 | 0.30 | 0.70 |
Stone wool (ceiling room L1 and L2) | 0.036–0.096 | 140 | 0.840 | 0.05 | 0.95 |
PVC-cable (analytical cable) | 0.143–0.151 | 1 380 | 0.933–1.548 | 0.025 | 0.90 |
PVC-cable (real cable) | 0.290–0.255 | 1 190 | 1.014–1.499 | 0.0277 | 0.80 |
Steel (pan) | 75 | 7 850 | 0.484 | 0.005 | 0.90 |
Steel (air channel: inlet, outlet) | 0.0013 | 0.90 |
4.5 Instrumentation
Abbreviations (sensor group) | Quantities | Unit |
---|---|---|
CO | Carbon monoxide | mol/mol |
CO2 | Carbon dioxide | mol/mol |
O2 | Oxygen | mol/mol |
TCA; TCR | Temperature analytical cable; temperature real cable | °C |
TG | Gas temperature | °C |
TP | Temperature wall surface | °C |
FLT | Total heat flux | kW/m2 |
4.6 Target Objects
5 Simulations with Numerical Model
6 Application of Methodology
Analysed sensorgroups | \({U}_{\mathrm{NED}}\) [%] | \({U}_{\mathrm{PEAK}}\) [%] | Analysed sensorsa | Data available | ||
---|---|---|---|---|---|---|
PRS_D3 | PRS_D4 | PRS_D5 | This study | |||
CO | 26.1 | 15.5 | 5 | 5 | 5 | 15 |
CO2 | 26.2 | 15.5 | 5 | 5 | 5 | 15 |
O2 | 29.1 | 15.5 | 5 | 5 | 5 | 15 |
TCA | 19.0 | 14.1 | 15 | 15 | 15 | 45 |
TCR | 19.1 | 14.1 | – | 15 | 15 | 30 |
TG | 18.6 | 14.1 | 140 (1) | 139 (1) | 124 (12) | 403 |
TP | 19.6 | 14.1 | 17 (5) | 17 | 22 | 56 |
FLT | 31.8 | 22.2 | 18 (4) | 21 (1) | 17 (5) | 56 |
Sum total | 205 (10) | 222 (2) | 208 (17) | 635 |
6.1 PEAK/NED Analysis for All Sensor Groups (Weight D3, D4, D5)
Analysed sensor groups | Used sensors each group | Standard deviation | Mean value | In range of uncertainty (RoU) [%] | ||||
---|---|---|---|---|---|---|---|---|
N | \({\sigma }_{\mathrm{PEAK}}\) | \({\sigma }_{\mathrm{NED}}\) | \({\mu }_{\mathrm{PEAK}}\) | \({\mu }_{\mathrm{NED}}\) | PEAKs | NEDs | PEAK/NEDs | |
CO | 15 | 0.28 | 0.20 | − 0.29 | 0.27 | 46.7 | 53.3 | 46.7 |
CO2 | 15 | 0.11 | 0.05 | − 0.10 | 0.17 | 66.7 | 93.3 | 60.0 |
O2 | 15 | 0.08 | 0.03 | 0.00 | 0.06 | 93.3 | 100 | 93.3 |
TCA | 45 | 0.24 | 0.10 | − 0.10 | 0.23 | 33.3 | 42.2 | 31.1 |
TCR | 30 | 0.22 | 0.10 | − 0.06 | 0.22 | 43.3 | 36.7 | 26.7 |
TG | 403 | 0.27 | 0.15 | 0.25 | 0.27 | 46.9 | 39.2 | 34.2 |
TP | 56 | 0.17 | 0.08 | − 0.01 | 0.11 | 69.6 | 85.7 | 69.6 |
FLT | 56 | 0.35 | 0.20 | 0.10 | 0.34 | 53.6 | 55.4 | 42.9 |
-
For O2 and TP the forecast capability is best in comparison to all other sensor groups
-
CO2 and TCR show very low mean PEAK, but higher NED values, which indicates good forecast capability of local aspects (peak of time series course), but lower forecast capability of global aspects
-
Mean NED for CO, TG and FLT have larger values than for other sensor groups
-
Mean PEAK values for TG are positive which indicates over-estimation of temperatures in the whole
-
Mean PEAK values for CO are negative which indicates under-estimation of temperatures in the whole
6.2 Impact of FDS SUPPRESSION Parameter on Gas Temperature (TG) Modelling
6.3 PEAK/NED Analysis for Different Parameters for All Sensor Groups
-
Standard deviation (\(\sigma\)) mean (\(\mu\)) and median (\(m\)) for PEAK and NED are significantly higher for D5 than for D3 and D4
-
Mean (\(\mu\)), and median (\(m\)) for PEAK are positive, which indicates over-estimation of the relevant sensors
-
Some sensors show higher NED values (NED > 0.4), but PEAK values close to zero, coming from PRISME DOOR test 5, while the contrary situation does never occur
-
Standard deviation (\(\sigma\)) mean (\(\mu\)) and median (\(m\)) for PEAK and NED are significantly higher for the door between room L1 and L2 (L1_L2) and room L2 than for room L1
-
Mean (\(\mu\)) and median (\(m\)) for PEAK are nearby zero for room L1 which indicates good forecast capability for PEAK values in room L1; in contrast, from higher NED values we can conjecture that the simulation forecast for the overall curve does not reach a convincing level. A deeper investigation using COMET for individual sensors or specific sensor groups as in Sect. 6.1 will provide more insights.