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A heat exchanger is constructed so that hot flue gases at 700K flow inside a 2.5 cm ID copper tube with 1.6 mm wall thickness. A 5 cm ID tube is placed around the copper tube. In the annular space, high-pressure water at 300 K flows at the rate of 1.5 kg/s and the total heat fransfer is 15 kW. Estimate the length of the heat exchanger for a gas flow rate of 0.8 kg/s. You may ignore the tube wall resistance and the flue gas properties are the same as those of air at 700K.
a cylinder subjected to internal pressure pi only is made of cast iron having ultimate tensile strengths in tension and
Taking the temperature of the surrounding surfaces to be 20°C also, determine the rate of heat loss from the steam pipe.
a fan with 1-m-diameter blades moves air at 20degc at sea level. the fan produces a volumetric flow rate of 942 m3min.
a mass of 1 kg attached to a spring with a spring constant of 112 nm oscillates horizontally on a smooth frictionless
If the rod experienced 28% uniform strain, calculated the load at the onset of necking.
a 250 g 23.0-cm-diameter plastic disk is spun on an axle through its center by an electric motor. what torque must the
liquid propane is commonly used as a fuel for heating homes powering vehicles such as forklifts and filling portable
find the natural frequency of a pendulum for small angle deflections when the mass of the rod/string is not negligible. (Mass of rod = m, mass of ball = M.
a room at 22 celsius is heated electrically with 1500 w to keep a steady temperature. the outside ambient is at 5
if ice homogeneously nucleates at -49.3oc calculate the critical radius given values of -3.1 times 108 jm3 and 25 times
determine diameter of a circular rod of ductile material with a fatigue strength ,e=280 Mpa. Add a tensile yield strength of 350 Mpa. The member is subjected to a varying axial load from 700 kN to -300kN. Assume Kt=1.8 and factor of safety=2.
air enters a constant-diameter tube with an average velocity of 2 ms at a temperature of 400 k and a pressure of 0.12
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