This document outlines the evolution of improved stove designs for fuel efficiency and reduced emissions. It describes 22 stove designs ranging from traditional three stone fires to more advanced natural and forced draft gasifier stoves. The stoves utilize techniques such as annular designs, chimneys, grates, and secondary air channels to improve combustion and fuel use. More recent designs also allow for production of biochar and easier ash removal.

1. EVOLUTION OF GOOD STOVE DESIGNS VER. 2 OPEN KNOWLEDGE [OK] Dr. N. Sai Bhaskar Reddy, CEO, GEO saibhaskarnakka@gmail.com http://www.e-geo.org http://www.goodstove.com Ver. 1 22 designs.

2. THREE STONE STOVE BRICKS STONES FUEL FUEL AIR FROM ALL SIDES

3. ANNULAR STOVE - OPEN METAL STOVE CEMENT STOVE FUEL SIDE AIR

4. ANNULAR STOVE – WITH POT - OPEN CLAY AND BRICKS FUEL SIDE AIR

5. ANNULAR STOVE CLAY AND BRICKS METAL FUEL SIDE AIR

6. ANNULAR STOVE – WITH POT A. CLAY AND BRICKS FUEL SIDE AIR

7. ANNULAR STOVE – TALL WITH CHIMNEY EFFECT A. BOMBAY STOVE SIDE AIR

8. ANNULAR STOVE – TALL WITH CHIMNEY EFFECT BANGLADESH STOVE 1 BANGLADESH STOVE 2 BANGLADESH STOVES 3 FUEL FUEL FEED & SECONDARY AIR PIT FOR ASH COLLECTION PRIMARY AIR (WITH OR WITHOUT)

9. ANNULAR STOVE – WITH CHIMNEY DRAFT AIR SIDE AIR

10. ANNULAR STOVE – WITH CHIMNEY & GRATE GOOD STOVE (TWO POT) GOODSTOVE DESIGN DRAFT AIR FUEL SIDE AIR GRATE PRIMARY AIR

11. ANNULAR STOVE – RAISED FOR CHIMNEY EFFECT & GRATE GOOD STOVE PORTABLE GOODSTOVE (SINGLE POT) DRAFT AIR FUEL SIDE AIR GRATE PRIMARY AIR

12. ANNULAR STOVE – RAISED FOR CHIMNEY EFFECT & GRATE DRAFT AIR SIDE AIR FUEL GRATE PRIMARY AIR GOOD STOVE (TWO POT)

13. NATURAL DRAFT TLUD GASIFIER STOVE A. LOW-COST WOODGAS STOVE FUEL SECONDARY AIR DRAFT AIR GRATE PRIMARY AIR

14. NATURAL DRAFT TLUD GASIFIER STOVE DRAFT AIR SECONDARY AIR FUEL GRATE PRIMARY AIR

15. A. Magh-1 B. Magh-3 C. Magh-1b D. Magh-1 Cyclone E. Magh-4 Lamp stove FORCED AIR TLUD GASIFIER STOVE SECONDARY AIR FUEL DRAFT AIR GRATE FORCED AIR (FAN) PRIMARY AIR

16. FORCED AIR TLUD GASIFIER STOVE SECONDARY AIR FUEL FUEL DRAFT AIR DRAFT AIR GRATE GRATE FORCED AIR (FAN) PRIMARY AIR A. Magh-2 B. Magh Open stove

17. DOWN DRAFT GASIFIER STOVE BIOMASS FEED FUEL DRAFT AIR BURNER SECONDARY AIR PRIMARY AIR GRATE

18. FORCED AIR TLUD GASIFIER STOVE A MAGH CM B. MAGH OPEN STOVE FORCED AIR (FAN) FUEL SECONDARY AIR DRAFT AIR GRATE PRIMARY AIR & FACILITY FOR BIOCHAR / ASH REMOVAL

19. NATURAL DRAFT TLUD HYBRID STOVE A. MAGH CM LAXMI NATURAL DRAFT SECONDARY AIR DRAFT AIR GRATE PRIMARY AIR & FACILITY FOR BIOCHAR / ASH REMOVAL

20. HYBRID STOVE – SIDE FEED FOR ALL TYPES OF FUELS A. AVAN STOVE BIOMASS FEED DRAFT AIR SECONDARY AIR FUEL GRATE PRIMARY AIR & FACILITY FOR BIOCHAR / ASH REMOVAL

21. HYBRID TLUD STOVE / CHARCOAL RETORT MAGH BURNER SERIES MAGH CM II NATURAL DRAFT SECONDARY AIR FUEL GRATE PRIMARY AIR & FACILITY FOR BIOCHAR / ASH REMOVAL

22. NATURAL DRAFT TLUD GASIFIER STOVE FUEL A. TWISTER STOVE GRATE NATURAL DRAFT SECONDARY AIR PRIMARY AIR & FACILITY FOR BIOCHAR / ASH REMOVAL

23. HYBRID STOVE – TLUD / ALL TYPES OF FUELS A. MAGH 3G SECONDARY AIR FUEL SIDE AIR CONTROL SIDE AIR GRATE PRIMARY AIR & FACILITY FOR BIOCHAR / ASH REMOVAL

25. THE GASES FLOW UP OR DOWN BASED ON THE DRAFT, MINIMUM GASES FLOW OUT AS SOME GAS REACHES THE COMBUSTION CHAMBER UP / DOWN DRAFT STOVE CHANNEL FOR DRAFT STOVE POT RAISED PLATFORM FEED Satara sugarcane juice boiling stove 2 GROUND AIR