Test result
Water boiling test (WBT)
Stove and fuel
Stove description
WFP rocket (World Food Programme). Metal food containers are used as materials of construction. The combustion chamber is constructed from sheet metal and is surrounded by insulation such as wood ash, pumice, or vermiculite. The stove that was tested had vermiculite insulation and had a pot skirt. The relatively low mass of the stove minimizes heat loss and results in higher temperature combustion to reduce pollutant emissions. However, the sheet metal combustion chamber becomes red-hot during operation, so the stove deteriorates rapidly compared to other stoves that were tested. The WFP rocket stove typically must be repaired or replaced after about 3 months of daily use.
Stove characteristics
Rocket, Non-traditional
Fuel type
Wood
Fuel description
Kiln-Dried Douglas fir
Fuel moisture content
0.1%
Fuel net calorific value
19.5 MJ/kg
Test information
Test details
WBT-3.3, Cold Start; Hot Start; 45 Simmer
Testing organization
Reporting type
Third party
Country
United States
Year performed
2009
Test environment
Lab
Altitude
100 m
Number of replicate tests
3
Test result IWA tiers of performance
Show subtiers
unrated
Emissions
unrated
Efficiency
unrated
Indoor emissions
unrated
Safety
Performance metrics
IWA emissions  
Metric Value SD (σ) Cv
IWA high power CO 4.665 g/MJ-del
IWA efficiency  
Metric Value SD (σ) Cv
IWA high power thermal efficiency 47.1%
IWA indoor emissions  
Metric Value SD (σ) Cv
IWA CO 0.093 g/min
Efficiency, energy consumption and fuel use
Metric Value SD (σ) Cv
Fuel consumed 93.0 g/task 5.8 0.06
Hot start thermal efficiency 47.1%
Cold start thermal efficiency 46.5%
Output
Metric Value SD (σ) Cv
Mean time to boil 14.3 min
Emissions
Metric Value SD (σ) Cv
CO emissions factor (2) 42.55 g/kg fuel 16.11 0.38
PM2.5 emissions factor (2) 2.96 g/kg fuel 0.59 0.2
CO emissions rate 0.093229086 g/min 0.035301548 0.38
PM2.5 emissions rate 6.483312199 mg/min 1.294106997 0.2
Test Conditions Metrics
Metric Value SD (σ) Cv
Local boiling point 99.6 degrees C