Design

Procedure followed to design and construct the cooking Stove

Thermal design assumption of the cooking stove

• Test the performance of designs based on the experience of Zimbabwe residents who cook inside of their dwellings without proper ventilation and suffer from IAP.
• One square meter of discarded sheet metal 1mm thick was used to create several different units.
• The metal sheet was marked using some chalk to create fold lines and cut lines.
• The marked shapes were cut using sheet metal snips. The shapes were joining by folding the edges of the two-dimensional shapes to form threedimensional shapes.

Note: Pop rivets were used for speed, but the shapes can all be assembled using folded tabs.

Design of Combustion Chamber:

The combustion chamber is designed in a rectangular prism shape. In the combustion chamber fuel (wood pieces) are combusted. It was observed that inner chamber became red hot. To reduce the heat losses from inner chamber, a jacket of coarse sand and heat resistance refractory material was added (Fire Clay). As shown in the figure to the right.

The Clean Cooking System has two components:

1. Stove “Cooker” to burn fuel more efficiently and reduce emitted smoke.
2. Chimney and hood, to eliminate fumes from dwelling. The chimney is isolated from the roof by a 2nd outer pipe. Nails are used to isolate the chimney pipe from the insulating pipe and the roof.