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An energy storage system is proposed to absorb ther- mal energy collected during the day with a solar col- lector and release thermal energy at night to heat a building. The key component of the system is a shell-and-tube heat exchanger with the shell side filled with n-octadecane (see Problem 8.47).
(a) Warm water from the solar collector is delivered to the heat exchanger at Th,i 40°C and m 2 kg/s through the tube bundle consisting of 50 tubes, two tube passes, and a tube length per pass of Lt 2 m. The thin-walled, metal tubes are of diam- eter D 25 mm. Free convection exists within the molten n-octadecane, providing an average heat transfer coefficient of ho 25 W/m2 · K on the out- side of each tube. Determine the volume of n- octadecane that is melted over a 12-h period. If the heat exchanger, increasing the water temperature and solidifying the n-octadecane. Do you expect the heat transfer rate to be the same, greater than, or less than the heat transfer rate in part (a)? Explain your reasoning.
In a hydroelectric power plant, water enters the turbine nozzles at 880 kPa absolute with a negligible velocity. If the nozzle outlets are exposed to atmospheric pressure of 100 kPa, determine the maximum velocity to which water can be accelerated b..
a research facility on the moon will include a series of canals connected to a central lake which will simultaneously
Tensile force formulas, A cylindrical steel beam is 2 inches diameter and 6 feet long. The modulus of elasticity is 30 x 1,000,000 psi. If the beam is subjected to a tensile force of 1000 lbs, what will be the resulting unit strain?
the breaking strength x kg of a certain type of plastic block is normally distributed with a mean of 1500 kg and a
a particle moves along a straight line with an acceleration of a 53s13 s52ms2 where s is in meters. determine the
1) What do you think of a handheld vacuum? 2) How often do you use a handheld vacuum? 3) What do you like about handheld vacuum?
calculate the power required to drive a steady-flow compressor if air flowing at a rate of 1kgs enters at 100kpa
a 4m3 storage tank containing 2m3 of liquid is about to be pressurized with air from a large high-pressure reservoir
A cylindrical pressure vessel of 120 in diameter outside, used for processing rubber, is 36 ft. long. If the cylinder portion of the vessel operates at 120 psi internal pressure, what are the stresses acting on an element at the inside surface of the..
a full revolution press has 100 rpm flywheel rotation.it has two handed trip devices mounted 20 inches from point of operation how many engagement points on the flywheel would be nessary to make this machine safe?
the cost of sending a package by an express delivery service is s12.00 for the first two pounds and 4.50 for each pound
nitrogen is expanded isentropically. its temperature changes from 620 degf to 60 degf. the volume ratio is v2v1 is 6.22
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