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1. A single-pass, cross-flow heat exchanger uses hot exhaust gases (mixed) to heat water (unmixed) from 30 to 80°C at a rate of 3 kg/s. The exhaust gases, hav- ing thermophysical properties similar to air, enter and exit the exchanger at 225 and 100°C, respectively. If the overall heat transfer coefficient is 200 W/m2 · K, estimate the required surface area.
2. Consider the fluid conditions and overall heat transfer coefficient of Problem 11.32 for a concentric tube heat exchanger operating in parallel flow. The thin-walled separator tube has a diameter of 100 mm.
(a) Determine the required length for the exchanger.
(b) If the exchanger were operated in counterflow with the same overall coefficient and inlet temperatures, what would be the reduction in the required length relative to the value found in part (a)?
(c) For the counterflow configuration, plot the effec- tiveness and fluid outlet temperatures as a function of the tube length for 60 L 400 m.
1. analyze the probable cause of the following problems in motors and suggest remedial measuresa. a
the 3-kg slender rod rotated in a vertical plane about a pivot at b. a spring of constant k 300 nm and of unstretched
Calculate the Net Positive Suction Head (NPSH) for the system - What is the revised NPSH for the higher water temperature?
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What is the total change in velocity required to go from a 200 km altitude circular, Earth orbit to circular orbit with a radius of 384,000 km (the mean radius of moons orbit relative to the earth, but ignore the moons presence}?
An air standard dual cycle operates with a compression ratio of 15. At the beginning of the compression the conditions are 17°C, 0.95 bar, and 3.8L. The amount of heat added is 6.3 kJ, of which one-third is added at constant volume and the remainder ..
A steel ring of mean diameter 250 mm has a square section 2.5 mm by 2.5 mm. it is split by a narrow radial saw cut. the saw cut is opened up further by a tangential separating force of 0.2 N. calculate the extra separation at the saw cut. E = 200G..
determine the number of vehicles needed to satisfy the indicated deliveries per hour? Assume that availability = 0.90.
a 120 lbm base jumper extreme parachutist leaps from el capitan in yosemite national park 3000 ft vertical drop head
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