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A solution of organic colloids in water is to be concentrated from 8 to 45 percent solids in a single-effect evaporator. Steam is available at a gauge pressure of 1.03 atm (120SC). A pressure of 102 mm Hg ab, is to be maintained in the vapor space: this corresponds to a boiling point for water of 51.7°C. The feed rate to the evaporator is 20,000 kgfh. The overall heat -transfer coefficient can be taken as 2800 W/m2_ cc. The solution has a negligible elevation in boiling point and a negligible heat of dilution. Calculate the steam consumption, the economy. and the heating surface required if the temperature of the feed is
(a) 51.7°C,
(b) 21.1'C,
(c) 93.3°C. The specific heat of the feed solution is 3.77 J/g_OC, and the latent heat of vaporization of the solution may be taken equal to that of water. Radiation losses may be neglected.
The maximum speed for a van of mass 1200 kilogram going around a horizontal curve of radius 120 m is 79 kilometer per hour. Find coefficient of friction between road surface and car tires
A 920 kilogram sports car collides into the rear end of a 2300 kilogram SUV stopped at a red light. Evaluate the speed of the sports car at impact
The human eye is sensitive to orange light having a frequency of about 4.95 1014 Hz, What is the energy in joules of the photons associated with this light
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What is the wavelength of the sound because perceived by a person standing on at the crossing when the train is approaching? What is the wavelength of the sound as perceived by a person standing on at the crossing when the train is leaving?
A ball is launched from a cannon at the ground level with speed v0=40 m/s at an angle 36.9 degrees above the horizontal. Find the horizontal range
A 120-V electrical line in a home is connected to a 100-W light bulb, a 180-W television set, a 230-W desktop computer, a 240-W refrigerator and a 1050-W toaster. How much current is flowing in the line?
a fan at a rock concert is 35.0m from the stage and at this point the sound intensity level is 108db . sound is
The equilateral glass prism shown has an index of refraction of 1.55. What is the smallest angle of incidence for which the ray of light will emerge from the right face of the prism
Astronauts on a distant planet throw a rock straight upward and record its mothion with a video camera. What is the acceleration of gravity on this planet
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