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A counter-flow double pipe heat exchanger is heat water from 20 degrees Celsius to 80 degrees Celsius at the rate of 1.2 kg/s. The heating is to be accomplished by geothermal water available at 160 degrees Celsius at a mass flow rate of 2 kg/s. The inner tube is thin-walled and has a diameter of 1.5 cm. if the overall heat transfer coefficient of the heat exchanger is 649 W/m2K, determine the length of the heat exchanger required to achieve the desired heating.
consider a 4-engine aircraft 2 on each wing where the probability of an engine failure is 0.001. assume that the
a door 1m wide and 1.5 m high is located in a plane vertical wall of a water tank. the door is hinged along its upper
Find the velocity of the bullet and block just after impact.
Steam enters an adiabatic turbine at 10MPa and 500C and leaves at 10kPa with a quality of 61 percent. Neglecting the changes in kinetic and potential energies, determine the mass flow rate required for a power output of 7.04MW.
a container with volume 213 cubic cm is heated and allowed to expand to 1.44 times the original volume. as the
A specific point during the re-entry flight of the Space Shuttle has the following condition: Mach number of 15.93, static pressure of 20 Pa, and static temperature of 245 K. Assuming that air is a calorically perfect gas and that this condition is s..
the roadster weighs 2750 lb its mass is evenly distributed between its front and rear wheels and it accelerates from 0
An evacuated 1-ft3 tank is connected by a valve to a nitrogen supply line flowing air at 120 psi and70oF. A valve is opened allowing air to flow into the tank until the pressure reaches 90 psi. How much mass flowed into the tank and what is its final..
Silicon rubber has a Poisson’s ratio of 0.4. Consider a silicon rubber drain hose for a surgical procedure; the hose has an outer diameter of 4 mm and a wall thickness of 0.5 mm. How much does the lumen (interior space) of the catheter constrict if t..
A gantry structure, similar to a tire swing, is used to test the response of an airplane during a crash. A 8000kg plane is hoisted back until the 20m swing cable is at theta=60. Determine the speed of the plane just before crashing into the ground at..
H2O at 50 kPa and 200 degrees C is compressed in a reversible, isothermal process with steady flow until it exists as a saturated vapor. Find w, q, and draw on a t-s diagram and p-v diagram
water at 24 degree c flows at 0.8 ms in a smooth 1.5 cm i.d tube that is kept at 27 degree c. the system is extremely
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