Test result: Original Gyapa
Water boiling test (WBT)
Stove and fuel
Stove description
Gyapa, high-moisture charcoal fuel
Stove characteristics
Ceramic-lined, Non-traditional
Fuel type
Charcoal
Fuel description
Charcoal, wet
Fuel moisture content
0.075%
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
unrated
Emissions
unrated
Efficiency
unrated
Indoor emissions
unrated
Safety
Performance metrics
IWA emissions  
Metric Value SD (σ) Cv
IWA low power CO 0.281 g/min/L
IWA low power PM 2.3 mg/min/L
IWA high power CO 44.3 g/MJ-del 4.5 0.1
IWA high power PM 791.5 mg/MJ-del 300.0 0.38
IWA efficiency  
Metric Value SD (σ) Cv
IWA low power specific consumption 0.026 MJ/min/L
IWA high power thermal efficiency 27.0% 1.8 0.07
IWA indoor emissions  
Metric Value SD (σ) Cv
IWA CO 1.996 g/min
IWA PM 26.792 mg/min
Efficiency, energy consumption and fuel use
Metric Value SD (σ) Cv
Fuel consumed 85.0 g/task
Cold start thermal efficiency 22.5% 1.4 0.06
Hot start thermal efficiency 31.5% 2.2 0.07
Output
Metric Value SD (σ) Cv
Cold start firepower 3439.0 W 332.0 0.1
Hot start firepower 3609.0 W 464.0 0.13
Simmer firepower 1759.0 W 57.0 0.03
Mean time to boil 37.4 min 2.25 0.06
Emissions
Metric Value SD (σ) Cv
PM2.5 emissions factor (2) 4.3675 g/kg fuel
CO emissions factor (2) 361.375 g/kg fuel
CH4 emissions factor (2) 4.94625 g/kg fuel
PM2.5 emissions rate 24.51411535 mg/min
CO emissions rate 1.996 g/min