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Saturated steam condenses completely to liquid water at a rate of m1 = 2 kg/s at 40 bar pressure (saturation temperature ts=140 oC, heat of vapourisation hfg=2100 kJ/kg) in a heat exchanger with heat transfer surface area of 116 m2. The heat exchanger is employed to heat water (cw=4.2 kJ/kgK) from t2in=20 oC. The heat transfer coefficients by convection on the steam and water sides are h1 = 2200 W/m2K and h2 = 2200 W/m2K respectively. The thickness of the conductive surface is 0.005 m, and its thermal conductivity is 50 W/mK. Determine the logarithmic mean temperature, the water exit temperature t2out and the water mass flow.
Steam at 100 psia, 500oF is throttled to 20 psia. Changes in kinetic energy are negligible for this process. Determine the final temperature and specific volume of the steam.
if ice homogeneously nucleates at -58.5oc calculate the critical radius given values of -3.1 times 108 jm3 and 25 times
determine the temperatures of surface 1 through 4 of the furnace cavity of example 13.3 if the entire furnace
Two solid cylindrical rods (1) and (2) are joined together at flange B and loaded. If the normal stress in each rod must be limited to 110 MPa, determine the minimum diameter D required for each rod.
consider a house with inside air temperature of 22 degc. one of the walls of the house has three single-pane glass
a mass of 4.0 kg of r-134a at p1140 kpa and t1 20 cis contained in a gas tight frictionless piston cylinder device. the
a piston-cylinder device contains 5 kg of saturated water vapor at 3 mpa. now heat is rejected from the cylinder at
Briefly explain the difference between fatigue striations and beachmarks in terms of both size and origin.
steam enters a urbine at 25 mpa 550c and exits at 5 mpa 325c at a flow rate of 70 kgs. determine the total power output
a power station output is 500 megawatts. during a test it is found that this represents 28 of the energy put into the
Important information about Multipal choice question on mechanics, A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine?
heat is generated uniformly inside a 20-mm thick plane wall at a rate of 20000 wm3. the thermal conductivity of the
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