Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Electrical heating of a pipe (Fig.), in the manufacture of glass-coated steel pipes, it is common practice first to heat the pipe to the melting range of glass and then to contact the hot pipe surface with glass granules. These granules melt and wet the pipe surface to form a tightly adhering nonporous coat. In one method of preheating the pipe, an electric current is passed along the pipe, with the result that the pipe is heated (as in S10.2). For the purpose of this problem make the following assumptions:
(i) The electrical conductivity of the pipe ke is constant over the temperature range of interest. The local rate of electrical heat production Se is then uniform throughout the pipe wall.
(ii) The top and bottom of the pipe are capped in such a way that heat losses through them are negligible.
(iii) Heat loss from the outer surface of the pipe to the surroundings is given by Newton's law of cooling: qr = h(T1 - Ta). Here h is a suitable heat transfer coefficient. How much electrical power is needed to maintain the inner pipe surface at some desired temperature, TK, for known k, Ta, h, and pipedimensions?
A centrifugal fan equipped with damper control has the damper wide open at full flow. The damper is partly closed to reduce flow to 80 percent of full load. Estimate the changes, in percent, in static pressure, and the horsepower requirement.
the owner of a new home is considering the economics of current and proposed designs. the current design is the
A window-mounted room air conditioner removes energy by heat transfer from a room and rejects energy by heat transfer to the outside air. For steady -state operation, the air conditioner cycle requires a power input of 0.434kw and has a coefficient o..
an electric circuit consists of a 12-v storage battery a 10 ohm resistor and an electric motor connected in parallel.
the elevator e has a mass of 500kg and the counterweight at a has a mass of 150kg. if the motor supplies a constant
A tank with a flat bottom is filled with water to a height of 3.5 meters. what is the pressure at any point at the bottom of the tank? (You can ignore atmospheric pressure when calculating your answer.)
The Molar Volume of Al2O3 at 25 Degrees Celsius and 1 atm is 25.715 cc/mol. Its coefficient of thermal expansion is 26 x10^-6 K^-1 and the coefficient of compressibility is 8.0 x10^-7 atm^-1. Estimate the molar volume of Al2O3 at 400 degrees Celsius ..
Hot combustion gases enter the nozzle of a turbojet engine at 260 kPa, 747°C, and 80 m/s, and they exit at a pressure of 85 kPa. Assuming an isentropic efficiency of 92 percent and treating the combustion gases as air, determine
compute the overall thermal resistance of a wall made up of 100 mm brick 1920 kgm3 and 200 mm normal weight concrete
consider a regenerative vapor power cycle with two feedwater heaters a closed one and an open one. steam enters the
a small high speed turbine operating on compressed air produces a power output of 100 w. the inlet state is 4 bar 50
a thin-walled cylindrical pressure vessel of 250 mm internal diameter and 5 mm thickness is subjected to an internal
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd