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Air preheater are heat exchanger to preheat or air heating of the combustion air by means of flue gas, steam, water or thermal oil. Consider a sample of air which has a dry-bulb temperature of 30°C and a wet-bulb temperature of 15°C at 101.3 kPa. It is desired to heat the air in a preheater and then spray water into it adiabatically so that final air will be saturated at 30°C. Using the psychrometric chart, determine:
(a) The Humidity and Percent humidity of the initial air
(b) The Temperature to which the air is to be heated in the preheater and
(c) the Heat to be supplied per kg of dry air
A farsighted woman breaks her current eyeglasses and is using an old pair whose refractive power is 1.950 diopters. How far is her near point from her eyes
A spherical mirror is to be used to form an image, five times as tall as an object, on a screen positioned 4.2 m from the mirror. Describe the type of mirror required
A bat (see the image below) can detect very small objects, such as an insect whose length is approximately equal to one wavelength of the sound the bat makes. what is the smallest insect the bat can detect
A wave is described by y = 0.019 4 sin(kx - ?t), where k = 2.22 rad/m, ? = 3.56 rad/s, x and y are in meters, and t is in seconds. Determine the wavelength of the wave
A spring is hanging from the ceiling. Attaching a 480 g mass to the spring causes it to stretch 21.0 cm in order to come to equilibrium. a. What is the spring constant? b. From equilibrium, the mass is pulled down 10 cm and released.
a laser beam is reflected by a plane mirror. it is observed that the angle between the incident and reflected beams is
A gardener pushes down on the handle of a lawnmower, applying a force of 250 Newton. find what is the acceleration of the 20 kilogram lawnmower
If the electric field at a point in space has a manitude of300 volts/meter, about how far apart are the equipopoetnial surfaces that differ by 10 volts?
The pressure in an automobile tire is usually quoted (in the United States) in pounds per square inch (lb/in2), What is the value of the gauge pressure in Pascals
Empty the ball and fill it with steel balls/iron filings and repeat the experiment. Similarly carry out the experiment with common salt. Compare the time periods obtained in the above three cases.What do you find? Explain your finding.
A cyclist pedals a bicycle. The driving wheel accelerates from the rest to an angular speed of 6.4 rev/s in 3.8 revolutions. What is the angular acceleration of the wheel
A golf ball is struck with a five iron on level ground. It lands 91.6m away 4.20 s later. What was (a) the direction and (b) the magnitude of the initial velocity?
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