Laplacian tactic for the prediction of the temperature components of solar cooker with logical prediction by fuzzy rules

•Nanoparticles coated bar plate as absorbing surface for solar radiation.•Laplacian approach for the solution of energy balance equation for the temperature components of the still has been attempted and succeeded.•Fuzzy inferences for the cooking process in the proposed cooker have been drafted.•Determination of the thermal performance of the cooker using the solution of Laplace method and fuzzy method has been presented.