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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.
Obtain a new solution, and determine whether any buckling constraints are active. If no buckling constraints are active for L = 10 in., re-run the analysis by increasing L , and estimate the value of L at which at least one buckling constraint b..
The efficiency of a refrigerator is given by the coefficient of performance (COP). Write two different expressions for the COP of a refrigeration cycle; one in terms of heat transfer and work input, and the other in terms of heat transfers only.
An electric locomotive together with its train has a mass of 200 tonne. The average tractive resistance to motion is 55 N/tonne while starting from rest up a gradient of 1 in 100. Calculate time taken to travel the first 1 km if the average tractive ..
a carnot heat engine receives heat from a reservoir at 900 degrees celsius at a rate of 800kjmin and rejects the waste
1 a nuclear power plant reactor operates at 3612 mwth. in the winter the plant is able to achieve an electrical output
A quantity of water with in a piston-cylinder assembly executes a Carnot power cycle. During isothermal expansion, the water is heated from saturated liquid at 50 bar until it is a saturated vapour. The vapour then expands adiabatically to a pressure..
Oil (p = 800 kg/m3 , u (mu) = 3.0 x 10^-3 kg/ms) is to be pumped at a rate of at least 6.3 x 10^-5 m3/s through hydraulically-smooth horizontal pipe with an equivalent length of 300 m. The pressure at the pipe inlet is 198 kPa (abs).
The gage pressure in an automobile tire when measured during winter at 32 o F was 32 psig. The same tire was used during the summer when the temperature rose to 112 o F. If we assume that the volume of the tire did not change, and no air leaked out b..
Steam at 80 bar, 440 Celsius, enters a turbine operating at steady state at a volumetric flow rate of 180 m3/min. The water exits the turbine in two streams, 20% as exits through a 0.25 m diameter pipe at 60 bar, 400 Celsius. The rest exits through a..
a cylindrical rod with a diameter of 25mm is subjected to a torque of 500n?m and axial tensile force of 40kn.i draw a
A shell-and-tube heat exchanger is used to cool a flow of steam using a stream of cooling water. The steam enters the heat exchanger at 0.1 bar and a quality of 91% (state 1), and exits as a saturated liquid at the same pressure (state 2). The mass f..
Damping experiments on iron were made using a torsion pendulum with a natural frequency of 0.65 cycles/s. The experiments were run at var- ious temperatures and the maximum log decrement was found at 35?C.
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