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The wet feed material to a continuous dryer contains 50 wt% water on a wet basis and is dried to 27 wt% by countercurrent air flow. The dried product leaves at the rate of 907.2kg/h. Fresh air to the system is at 25.6 degrees C and has a humidity of H=.007kg H2O/kg dry air. The moist air leaves the dryer at 37.8 degrees C and H=.02 and part of it is recirculated and mixed with the fresh air before entering a heater. The heated mixed air enters the dryer at 65.6 degrees C and H=.01. The solid enters at 26.7 degrees C and leaves at 26.7 degrees C. Calculate the fresh- air flow, the percent air leaving the dryer that is recycled, the heat added in the heater, and the heat loss from the dryer.
a 2.1-m long 0.2-cm diameter electrical wire extends across a room that is maintained at 200c. heat is generated in the
if the atmospheric pressure is 1.025 bar at a location where you can dive in a lake to 30ft below the surface and then
a piston-cylinder device initially contains 0.25 kg of nitrogen gas at 130 kpa and 180degc. the nitrogen is now
a laser is directed at a double-slit arrangement. if we increase the wavelength of the light which of the following
the cake batter has an average mass of 0.5 kg between before and after baking and the pyrex cake pan has a mass of 0.9
A 10 kW electric heater is used to heat 2 kg of air contained in an insulated rigid tank from 400 kPa and 50 °C to 200 °C. The ambient air temperature and pressure is 20 °C and 100 kPa, respectively.
Steam at 100 psia, 500oF is throttled to 20 psia. Changes in kinetic energy are negligible for this process. Determine the final temperature and specific volume of the steam.
a copper-clad steel sheet is produced by hot roll bonding. the cladding separated during deep drawing. what are some
The polynomial method is to be used to solve the equation. For the graphs, Mathcad or similar program is necessary to graph the solution.
ten grams of liquid water at 95 c are contained in the insulated container shown. the pin holding the frictionless
piston and flywheelconsider the one-cylinder four-stroke engine assembly shown in figure 1. the mass of the piston p is
a 9 m3 tank has two sections separated by a membrane both of which contain nitrogen gas. the nitrogen in section a has
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