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Steady-state Water Boiling Test

Prasad of the Woodburning Stove Group believe that for laboratory work on wood-stove research and development a more engineering-oriented attitude must be taken than used in the standard Water Boiling Test.

From the cookstove.net webpage:

"A woodstove can be characterized by an efficiency-versus-power graph. The efficiency figures for a pan-stove combination should be established by steady-state water-boiling experiments. For woodstoves, the best we can hope for is periodic steady state. And the waterboiling test then is no longer a simulation of food-cooking process, with the water replacing the food, but instead the measurement of a heat transfer process, with the water as a convenient medium to measure the heat transfer from the fire to the pan."

The researcher claim that "This procedure... has been found through experience to be very simple and extremely reliable. It consists of a few simple instructions:

  1. Plan the experiments to last upward of an hour or burn 1 Kg or more of wood; to vary the power output under the batch opertion system simply divide the total fuel quantity to be used in the experiment into five or six equal parts and charge the stove at intervals of time determined by the desired power output; thus the air-dried. wood considered above produces approximately 5 kW if 200 g of wood is charged into the stove every 10 min.
  2. See that all the wood burns; the indication for this is the drop in water temperature below boiling point.
  3. Weigh the water before and after the experiment. Efficiency can then be calculated by Eq.1

Pending...

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User:Grant Ballard-Tremeer 25 September 2003

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Page created: 25 September 2003; Last edited: 15 October 2003; Version: 0
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