A convective kerosene heater is tested in a well-mixed 60 m3 chamber having an air exchange rate of 0.3 ach. After one hour of operation, the nitric oxide (NO) concentration reached 3 ppm. Treating NO as a conservative pollutant, estimate the NO source strenght of the heater (in mg/hr).
Assume: 25 oC and 1 atm

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.