top heat-loss; solar cooker; plate temperature; heat-transfer coefficient; ambient temperature; wind speeds
The top heat-loss factor (Ui) of a box-type solar cooker varies with plate temperature,
wind heat-transfer coefficient and ambient temperature. A method for correlating Ui with these variables is presented for a cooker with double glazing. A set of equations is developed for correlating data obtained in indoor experiments at different plate temperatures and wind speeds.