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from New Dawn Engineering

VestoVesto

The Vesto consists of five main components:

Developed by New Dawn Engineering

Available through Afreca (the Association for Renewable Energy Cooking Appliances)

The results of field testing the POCA/Maputo Ceramic Stove (MCS) and traditional metal stoves (TMS) using an uncontrolled cooking test (UCT) are attached. In a UCT people cook whatever they want and we watch carefully. The results have fuel-moisture compensated values. The charcoal was almost always hardwood lumps. Larger meals tend to be watery and small meals tend to be frying something in oil.

The comparison indicates a clear change in relative performance with meal size. The bigger the meal, the more the savings with the improved stove. There is also a chart attached showing the increase in thermal efficiency with meal size.

The meal size on one the X-axis.

The WBT locates one point on the line. Performing the test seven times locates that point very accurately but is it difficult to know where the line goes from that point.

No ‘outliers’ were removed in this analysis even when they were obvious. The meal size varies with the season so the question about consumption has more than one answer.

Regards
Crispin

Crispin Pemberton-Pigott and Roger Samson, February 2010

Please click Read More for a set of photos showing the construction of a prototype 125 mm diameter Grasifier Stove burning Switchgrass Pellets provided by Roger Samson (REAP-Canada).

Version 1.1 ENERGY COST OF MAKING CHARCOAL FROM DAMP WOOD
Download attached spreadsheet.
Edit only the values in the blue cells © C Pemberton‐Pigott, January 2010

Dry Fuel Equivalent Calculator
Crispin and Nigel Pemberton-Pigott, October 2007

Heat Content of Ethanol Gel
Crispin Pemberton-Pigott, August 26, 2007
Dear Friends

Maputo Ceramic Stove Update
Crispin Pemberton Pigott, New Dawn Engineering, Swaziland, June 6, 2007
MCSMCS

Video Showing Gasification-Combustion Transitions in the Vesto Stove
Crispin Pemberton-Pigott, New Dawn Engineering, Swaziland, June 4, 2007

Jigger Mould Making for the Maputo Ceramic Stove
Crispin Pemberton Pigott, New Dawn Engineering, March 7 2007
[img_assist|nid=1523|title=Finished, cured moulds|desc=|link=node|align=left|width=400|height=387]
This is a set of pictures to show the process for making the moulds. The results are quite impressive - smooth and hard, beautifully formed. We can make about 10 or more moulds per day using the Jigger mould holder as a form.

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