Wood charcoal is used as a cooking fuel in many developing countries. generally this wood is locally produced, low quality wood charcoal produced at a low temperature. a combustion engineer is working on designing a forced-air, charcoal cookstove with 1500 w of cooking power. to ensure that there is sufficient air to ensure complete combustion while maintaining the stove temperature high, the stove should be designed to have 10% excess air. the stove does not condense the water in the combustion products. the ultimate analysis of the locally produced charcoal is 92% c, 6% o, and 2% h (wt) and the higher heating value is 30 mj/kg. determine: a. the lower heating value of the charcoal, and b. assuming 50% efficiency, the airflow rate in l/min at standard temperature and pressure.