For Ke= 0.577 in. H2O-min/ft and Ks= 0.00986 in. H2O-min-ft/gr, design a reverse-air baghouseto filter 20,000 cfm of air with 2.5 gr/ft3of flour. Assume a cleaning time of 3.0 minutes anda filtration time of 60 minutes. In your design, specify the number of compartments, themaximum filtering velocity, the cloth area per compartment, and the total number of bagsrequired if each bag is 10 ft long and 1 ft in diameter. Also, specify the maximum pressuredrop that will be experienced during the run.

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?