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1. A heat exchanger brings 10 kg/s water from 100?C up to 500?C at 2000 kPa using air coming in at 1400 K and leaving at 460 K. What is the second law efficiency?
2. Calculate the second-law efficiency of the counter- flowing heat exchanger in Problem 7.105 with an ambient at 20?C.
Problem 7.105
A counter flowing heat exchanger has one line with 2 kg/s at 125 kPa, 1000 K entering, and the air is leaving at 100 kPa, 400 K. The other line has 0.5 kg/s water coming in at 200 kPa, 20?C and leaving at 200 kPa. What is the exit temperature of the water and the total rate of entropy generation?
A cylinder has 500 cm3 of water. After a mass of 100 grams of sand is poured into the cylinder and all air bubbles are removed by a vacuum pump, the water level rises to 537.5 cm3. Determine the specific gravity of the sand.
The flat circular disk rotates about a vertical axis through O with a slowly increasing angular velocity. Prior to rotation, each of the 0.60-kg sliding blocks has the position x = 29 mm with no force in its attached spring.
A vertical curve is designed for 90 km/h and has an initial grade of +2.5% and final grade of -1.0 %. the PVT is at station 3+480. It is known that a point on the curve at station 3+440 is at elevation 75m. What is the stationing and elevation of the..
A circular hole of diameter 11.42 + and - 0.03 inches is cut out of the plate. Also, using the tolerances given, determine the minimum possible area of the top surface of the metal plate.
If a plus sight of 3.54 ft is taken on BM A, elevation 850.48 ft, and a minus sight of 7.84 ft is read on point X, calculate the HI and the elevation of point X.
From the following excerpt of field notes, plot the cross section on graph paper and superimpose on it a design template for a 40-ft-wide level roadbed with cut slopes of 3:1 and a subgrade elevation of 1239.50 ft. Determine the end area graphical..
A normally consolidated clay soil has angle of friction = 20 degrees and effective stress angle of friction = 28 degrees. If a consolidated undrained test is conducted on this clay with an all around pressure of 21.5 lb/in^2
Tall buildings can develop a significant difference in pressure between the inside and the outside of the building. Air lock entrances are used at the ground level so the pressure at the ground floor is not the same as atmospheric pressure.
A cylindrical specimen of a metal alloy is stressed in compression. if its original and final diameters are 40.00mm and 40.10mm respectively, and its final length is 120.00mm
Describe the functions provided by a relational database that could be used to record courses taken by university students in order to manage scheduling and preparing transcripts
What is the theoretical maximum amount of work that could be done by a gas in a piston expanding from 10 L to 20 L (pressure of the surrounding atmosphere is 100 KPa)
Determine the force that should be developed in the cable if the saddle keeps the pipe from sagging or deflecting at its center. The pipe and fluid within it have a combined weight of 125 lb/ft. EI is constant.
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