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Air of 20.8% O 2 , concentration enters a coal mine panel at 20 m 3 /s and exits with 20.6% O 2 . The oxygen depletion is due to oxidation of carbon in spontaneous heating process only, assuming the density of oxygen as 1.3 kg/m 3 and the calorific value of carbon as 34 MJ/kg, the heat generated in kW from the panel due to spontaneous oxidation is