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Abstract
In this work, a numerical study of heat transfers in a metallic pressure cooker isolated with kapok wool was carried out. This equipment works like a thermos, allowing finishing cooking meals only thanks to the heat stored at the beginning of cooking, which generates energy savings. Cooked meals are also kept hot for long hours. In our previous work, we have highlighted the performances of the pressure cooker when making common dishes in Burkina Faso. Also, the parameters (thickness and density) of the insulating matrix allowing having such performances as well as the influence of the climatic conditions on the pressure cooker operation were analyzed in detail in this present work. The numerical methodology is based on the nodal method and the transfer equations obtained by making an energy balance on each node have been discretized using an implicit scheme with finite differences and resolved by the Gauss algorithm. Numerical results validated experimentally show that the thickness of the kapok wool as well as its density play an important role in the pressure cooker operation. In addition, equipment performances are very little influenced by the weather conditions of the city of Ouagadougou (Burkina Faso).
Highlights
IntroductionNatural insulation is more and more preferred over synthetic insulation because of the requirements related to sustainable development
The numerical methodology is based on the nodal method and the transfer equations obtained by making an energy balance on each node have been discretized using an implicit scheme with finite differences and resolved by the Gauss algorithm
Numerical results validated experimentally show that the thickness of the kapok wool as well as its density play an important role in the pressure cooker operation
Summary
Natural insulation is more and more preferred over synthetic insulation because of the requirements related to sustainable development. Natural insulators can be vegetable, animal or mineral origin. Among these natural insulators that are found in abundance in tropical countries like Burkina Faso, is kapok wool. Experimental studies conducted by Voumbo et al [1] on kapok wool, using the plate method, show very interesting thermophysical properties. They have shown that the thermal conductivity of kapok wool varies between 0.03 and 0.04 W/m∙K for a density between 5 and 40 kg/m3 and an average thermal diffusivity of 17.1 × 10−7 m2/s
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