Test result: Original Gyapa
Water boiling test (WBT)
Stove and fuel
Stove description
Gyapa, low-moisture charcoal fuel
Stove characteristics
Ceramic-lined, Non-traditional
Fuel type
Charcoal
Fuel description
Charcoal, dry
Fuel moisture content
0.046%
Fuel net calorific value
28.2 MJ/kg
Test information
Test details
WBT 4.1.2, 5 Liters of water
Testing organization
Reporting type
Third party
Country
United States
Year performed
2012
Test environment
Lab
Altitude
100 m
Number of replicate tests
3
Test result IWA tiers of performance
Show subtiers
0
Emissions
2
Efficiency
0
Indoor emissions
unrated
Safety
Performance metrics
IWA emissions  
Metric Value SD (σ) Cv
IWA low power CO 0.239 g/min/L
IWA low power PM 1.277 mg/min/L
IWA high power CO 36.8 g/MJ-del 16.45 0.45
IWA high power PM 476.5 mg/MJ-del 135.0 0.28
IWA efficiency  
Metric Value SD (σ) Cv
IWA low power specific consumption 0.026 MJ/min/L
IWA high power thermal efficiency 26.5% 1.5 0.06
IWA indoor emissions  
Metric Value SD (σ) Cv
IWA CO 1.69 g/min
IWA PM 16.192 mg/min
Efficiency, energy consumption and fuel use
Metric Value SD (σ) Cv
Cold start thermal efficiency 22.6% 2.5 0.11
Fuel consumed 86.0 g/task
Hot start thermal efficiency 30.3% 0.5 0.02
Output
Metric Value SD (σ) Cv
Cold start firepower 3615.0 W 486.0 0.13
Hot start firepower 3866.0 W 480.0 0.12
Simmer firepower 1766.0 W 177.0 0.1
Mean time to boil 35.7 min 4.0 0.11
Emissions
Metric Value SD (σ) Cv
PM2.5 emissions factor (2) 2.485 g/kg fuel
CO emissions factor (2) 300.575 g/kg fuel
CH4 emissions factor (2) 6.097 g/kg fuel
PM2.5 emissions rate 14.53800244 mg/min
CO emissions rate 1.69 g/min