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The Water Boiling Test WBT

The Water Boiling Test (WBT). The WBT is intended to measure stove performance under standardized laboratory conditions:High (boiling) and Low (simmering) powerStove body starting Cold and Hot Standard amount of water in standard testing pot: 5 liters or 2.5 litersQuantities of time, fuel use, a

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The Water Boiling Test WBT

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    1. The Water Boiling Test (WBT) Prepared by Nordica MacCarty, Laboratory Manager Aprovecho Research Center

    2. The Water Boiling Test (WBT) The WBT is intended to measure stove performance under standardized laboratory conditions: High (boiling) and Low (simmering) power Stove body starting Cold and Hot Standard amount of water in standard testing pot: 5 liters or 2.5 liters Quantities of time, fuel use, and water evaporated are measured Every stove is carefully tended to ensure it is operating at its best – all stoves given equal chance to do well. Each stove is tested at least 3 times The goal is to compare stoves performing a standard task, to see which can most effectively combust the fuel and transfer the heat into the cooking vessel.

    3. Purpose of WBT WBT is not intended to predict field performance. It is a measure of the capability of the stove design to complete a standard task. Field performance will always depend on the local cooking practice, which cannot be standardized. The WBT does help make sure that the physical design of the stove is the best it can be.

    4. Advantages to the WBT Stoves from around the world can be compared A target performance level (benchmark) can be set based on comparisons Effects of changes to a stove’s design can be observed quite clearly Similar to an EPA vehicle fuel consumption dynamometer – actual results will vary depending on driver and grade of fuel, but overall vehicle differences can be identified.

    5. Disadvantages to the WBT Fuel of differing composition/moisture content may behave differently User operation has a large effect Difficult to calculate for multi-task stoves griddle stove for frying, heating stoves New stoves may perform differently than stoves in use for some time chimney cleaned or not, parts burning out, etc.

    6. WBT Supplies Supplies Needed Standard Testing Pot holding 5L of water 2.5 L can be used for low-powered stoves Electronic Scale (10-15 kg capacity, 1-2 gram resolution) with Heat-Resistant Pad Thermometer/Thermocouple (with fast response) At least 3 kilos of testing wood per test 10L or more of room-temperature water Metal Tray for Weighing Charcoal Tools for removing charcoal (tongs, spatula) Heat resistant gloves

    7. WBT Procedure Bring 5L to boil with stove body starting cold Bring 5L to boil with stove body starting hot Continue into simmer for 45 minutes at about 3 degrees below boiling Between each phase, we measure and record: Time Mass of fuel Mass of water in pot Mass of charcoal remaining

    8. WBT Procedure

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