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A schematic diagram of a counterflow heat exchanger is shown in Figure 2.12. The hot fluid enters the central, circular pipe from the left and exits at the right. The cooling fluid is circulated around the inner tube to cool the hot fluid. Using the principles of heat exchanger system discussed in this chapter, construct a discrete system to determine the temperature distribution.
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?
3 kg of refrigerant 22 undergoes a process for which the pressure-specific volume relation is pv^-0.8 = constant. The initial state of the refrigerant is 12 bar and 60 degrees C. The final pressure is 8 bar. Kinetic and potential energy effects are n..
Assume that ω is a function of the sign width, b, sign height, h, wind velocity, V, air density, ρ, and an elastic constant, k, for the supporting pole. The constant, k, has dimensions of FL. Develop a suitable set of pi terms for this problem.
determine the force P required to start moving the beam.
In which of the above standards would you expect to find information relating to the size of fillet welds required for steel fabrications? How often are ASME codes reviewed? Which code(s) are related to Dimensions of manufactured items?
2kg of an ideal gas for which Cp=0.895 KJ/kg-k and Cv =0.706 KJ/kg-k is contained in a rigid, insulated container at 2 bar, 400K. A stirrer driven by an external motor is operated within the vessel until the pressure becomes 4bar. Determine, the fina..
Consider natural convection from a horizontal heated surface. Use Buckingham Pi Theorem to determine which dimensionless number you would used to investigate this phenomenon.
imagine that you work for an optical company and must measure and then report on the values of magnification produced
Calculate the nominal value of the source counting rate and the uncertainty in the rate. Apply Chauvenet's criterion to eliminate some of the data if necessary. Assume that the Poisson distribution applies.
Both tubes are standard steel tubes with 0.049-in wall thicknesses. The inside tube carries 4.75 gal/min of water at 200°F and the shell carries 30.0 gal/min of ethylene glycol at 77°F to carry heat away from the water. Compute the Reynolds number..
For an hour 11 AM to 12 noon on a clear winter day, IB = 1.38 MJ/m2, and ID = 0.41 MJ/m2. Ground reflectance is 0.6. For this hour, the incidence angle ? for the beam radiation is 17°, and RB = 2.11. A collector with one glass cover is sloped 60° and..
the lower end of the 30 kg slender rod is displaced a small amount and released from the rest. determine the natural frequency of vibration. the springs have stiffness of 500 N/m and they are stretched when the rod is hanging vertically.
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