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A steam generator comprises a boiler drum, a super heater, an economizer and an air preheater. The feedwater enters the economizer at 140oC and leaves as saturated liquid. Air is preheated from a temperature of 25oC to 250oC. Steam leaves the boiler drum (evaporator) at 60 bar, 0.98 dry and leaves the super heater at 450oC. When using coal with a calorific value of 25.2 MJ/kg, the rate of evaporation is 8.5 kg steam per kg coal and the air fuel ratio is 15:1 by mass. Neglecting heat losses and pressure drops, estimate the heat transfer per kg fuel in each component and the efficiency of the steam generator. What are the percentages of the total heat absorption taking place in the economizer, boiler drum and the superheater, respectively? Assume cp of air and water as 1.005 kJ/kg K and 4.2 kJ/kg K, respectively.
Evaluate the variation of hoop stresses across the wall of the compound cylinder.
All calculations and assumptions must be provided together with a full explanation of all the terms
Effect of pressure on temperature and density of air for an adiabatic process, The pressure is to be raised from atmospheric to 7 psi (4.83 bar). The process is adiabatic, and the volume is constant and unknown.
The Cost of Recharging a Battery, A 12-V automotive storage battery is charged with a constant current of 2 amp for 24 hr.
Carbon content of steel, A steel contains 55% alpha-ferrite and 45% gamma-ferrite or austenite at 750 degrees celcius. What is the carbon content of steel?
Water enters a 2 meter diameter pipe at a temperature of 23 deg C. The water leaves the pipe at a temperature of 97 deg C The laminar flow rate is such that the Reynolds number is 800. What is the mass flow rate?
determine the minimum time needed for the plate temperature to reach 140°C.
Verify that heating the wire may be treated as a lumped-capacity process, find the steady-state temperature of the wire and find how long it takes for the temperature of the wire to reach 100°C.
How would you calculate the sensible heat, the latent heat, and determine the latent heat of vaporization of the water vapor in this air stream as the air is cooled from 170 F to 48 F?
A heat pump is used to maintain a house at a constant temperature of 23 °C. The house is losing heat to the outside air through the walls and the windows at a rate of 60,000 kJ/hr while the energy generated within the house from people
Fluid Statics: Submerged Submarine, A submarine is at a depth of 2000 ft from the water surface. The atmospheric pressure above the water is at 14.7 psia
Evaluate the shearing and normal stresses at points H and J located at the ends of the horizontal and vertical diameters of transverse section located 2.5 in. to the left of bearing B.
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