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In the boiler of a power plant are tubes through which water flows as it is brought from a saturated liquid condition at 1000 lbf/in.2 to 1300°F at essentially constant pressure. Combustion gases passing over the tubes cool from 1740°F to temperature T at essentially constant pressure. The mass flow rates of the water and combustion gases are 400 and 2995.1 lb/s, respectively. The combustion gases can be modeled as air behaving as an ideal gas. There is no significant heat transfer from the boiler to its surroundings. Assuming steady state and neglecting the effects of motion and gravity, determine
(a) the exit temperature T of the combustion gases, in °F.
(b) the exergy destruction rate, in Btu/s.
(c) the exergetic efficiency given by Eq. 7.27. Let T0 5 50°F, p0 5 1 atm.
The system is at rest in the position shown, with the 12-lb collar A resting on the spring (k = 20 lb/ft), when a constant 30-lb force is applied to the cable. What is the velocity of the collar when it has risen 1 ft? The collar is attached to th..
A 4 cylinder 1.6 liter SI engine has a compression ratio of 10, connecting rod length of 16.8cm, and a crank offset of 4.5 cm. The engine is operating at 3000 RPM and wide open throttle. The exhaust pressure is 100 kPa. The intake valve closes at 20 ..
What is the rate of heat transfer through a wall that is 2 m high by 2.5 m wide? Sketch the temperature distribution
a hypothetical a-b alloy of composition 59 wt b-41 wt a at some temperature is found to consist of mass fractions of
DOF system and Find the differential equation describing the system
saturated liquid r-134a at 50 psia enters an adiabatic throttling value at a rate of 0.2-lbms. the outlet pressure is
Does the Rankine degree represent a larger or smaller temperature unit than the Kelvin degree? Explain. Specified states, the change in temperature between the end states is independent of details of the process.
A 1m-long metal cylinder of 25cm radius is heated such that the axial temperature distribution at a certain instant of time is T(z)=a+bz+cz2 where a=900K, b=-500K/m and c=150K/m2 . What is the rate of energy change of the cylinder at this instant if ..
water is drawn at steady state from a body up 15 m to a storage tank by a pump. pressure at the opening of the pump is
The outer surface of an iron alloy is to be hardened by increasing its carbon content. The carbon is to be supplied from an external carbon-rich atmosphere, which is maintained at an elevated temperature. A diffusion heat treatment at 871°C for 12 mi..
a fixed quantity of air at t1 100oc and p1 243 kpa is heated at constant pressure in a piston-cylinder assembly to t2
What are the reasons for obtaining the Structural Engineering (SE) license and What are the requirements to obtain the SE license in Idaho and California.
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