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A feed containing 15% by weight of solids is to be concentrated to 40 % solids using a double effect backward feed evaporator. The first effect is heated by steam at 413 K. Vapour from the second effect is condensed at a pressure corresponding to 325 K. The heat transfer area is 10 m2 and the overall heat transfer coefficients are 3 and 2 kW/m2 in the first and second effects respectively. The boiling point rise is 3 K in the first effect and zero in the second effect. If the feed enters at 310 K what is the maximum feed rate that can be accommodated?
It may be assumed that the heat loads on the two effects are equal and that the latent heats of evaporation and specific heats of the solutions are constant at 2330 kJ/kg and 4.18 kJ/kg respectively.
you are working as a project analyst for the local gas utility and you have been placed on a project to install an
Vehicles begin to arrive at a toll booth at eight vehicles per minute from 9 A.M. to 10 A.M. The booth opens at 9:10 A.M. and services at a rate of ten vehicles per minute until 9:40 A.M. From 9:40 A.M. until 10 A.M.
determine the cycle time for a single engine scraper rated at 21 cy heaped that is used to haul material from a pit to
If sewage (assume the properties are the same as those of water) flows at a depth of 1.5ft in the pipe, what will be the discharge Q = 10.6 cubic feet/second
The cable stays AB and AD help support pole AC. Knowing that the tension is 120 lb in AB and 40 lb in AD, determine graphically the magnitude and direction of the resultant of the forces exerted by the stays at A using (a) the parallelogram law, (b) ..
If the component of velocity along the axis is Vx=6t with t in seconds. determine the particle's distance from the oriigin which is at t=3s. when t=0, x=0, and y=0. also determine the magnitude of acceleration when t=3, x and y are in ft.
A nuclear power plant produces heat through fission of uranium which is used to create high pressure steam. The steam expands through a turbine to a low pressure in order to produce work which drives a generator to produce electric power.
To protect the channel from erosion, the normal flow velocity for the design discharge has to be reduced to 7.0 fps or below, and the flow Froude number must be reduced to 0.80 or below.
If an alternative base material is available for $5,791.50 per lane-mile per inch depth, to use it, the minimum depth for asphalt has to be increase to 6 inch with no change of base and subbasedepth. What will be the total cost per lane-mile per i..
A smart, anti armour weappon is launched of an aircraft flying at 250 knots (422 FT/s) straight and level at an altitude of 300FT above the ground, the weapon is released from the aircraft with an initial downward velocity of 15FT/s.
how large a sample must we take in order to be a) 95% b) 90% c) 99 d) 99.73% confident that the error in the estimated mean lifetime will not exceed 20 hours.
The current removal efficiency is 96% for an air flow rate through the separator equal to 18 m3/s. Due to a process change, the air flow rate is expected to increase to 22 m3/s.
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