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The water is cooled by air that enters at 0.75 kg/s and 300 K. If the overall heat transfer coefficient is 220 W/m2·K, what is the required heat transfer surface area?
Find (a) condensing surface area required, (b) circulating water flow rate in kg/s, (c) the number of tubes and (d) the length of tubes. The data: Mean water velocity 1.5 m/s, water inlet temperatur
An electrical power transformer of diameter 250 mm and height 600 mm dissipates 1200 W. Determine the required coolant flow rate, the total length of tubing, and the lateral spacing S between turns of
Estimate the wave drag experienced by the airplane. Assume that all the necessary lift is generated by the wing of the airplane.
Estimate (a) the percentage chain in toque accompanying a 20 percent drop in speed (from the axial direction) while operating with design mass flow.
Plot the maximum efficiency of a nuclear power plant as a function of the maximum allowable temperature in the reactor core.
It supplies heat to a room at a rate of 46,000 Btu/hr in order to maintain the temperature at 70 degrees F. The environment is at a temp of -10 degrees F. Determine power required to drive the compr
Air at 2900 R, 435 psia enters a turbine operating at steady state and expands adiabatically to the exit, where the temperature is 1500 R.
Calculate thermal efficiency (%) of the power plant. Show the cycle on T-s diagram, indicating temperature values and lines of constant pressure.
Find the horizontal and vertical components of force exerted on the left end of the rod by the hinge. (Take up and to the right to be the positive directions.) (in N)
The bumper consists of an 800 kg mass that the car runs into, and a pair of large springs. The car travels 2.4m before coming to rest. Find the time taken for the car to be brought to rest.
During the process, heat transfer from the water occurs at such a rate as to keep the temperature constant at 300 F. Determine the magnitude and the direction of the work (ft-lbf) and heat transfer
Mass flow rate of air through all devices is 80 kg/s. Show the cycle on T-s diagram, indicating temperature values and lines of constant pressure.
The isentropic efficiency of the nozzle is 94%. Determine the exit velocity, in ft/s. Calculate the entropy production of the process, in Btu/(lbm-R).
Assuming the engine above is a 3.7 liter V-6 operating at 7000 rpm, determine the following: VTDC and VBDC PER CYLINDER and Mass of air per cylinder.
At the beginning of the compression process, the pressure and temperature are P1 = 0.1 MPa and T1 = 300 K. The cut-off ratio for the cycle is 2.
Determine the mass flow rate through the boiler needed for this system to produce a net 5000 kW of power and the thermal efficiency of the cycle.
The density of the truncated cone is 4000 kg/m3 and the density of the hemisphere is 8000 kg/m3. Find the coordinate (x,y,z) of the center of mass of the rigid body.
Show all states on T-s diagram. You must label states, show temperature and specific entropy values, and indicate appropriate lines of constant pressure.
Water enters an insulated nozzle operating under steady conditions at a pressure of 60 psia, a temperature of 350 °F and a velocity of 10 ft/s. Calculate the entropy production of the process, in
Neglecting any inefficiency in the furnace, what amount of natural gas must be burned to raise the building's temperature from freezing to 70 F?
Two rigid tanks that are each 20 ft^3 are connected by a line containing a control valve that is initially closed. Determine the following: Heat transferred during the process.
Assuming air behaves as an ideal gas with constant specific heats as given (CV = 0.718 kJ/kg.K CP= 1.005 kj/kg.K, and R=0.287kJ/kg.K) determine the following: Boundary work done.
The cut-off ratio for the cycle is 2. Determine: the temperature and pressure at the end of each process of the cycle, the thermal efficiency.
A bar of steel 3 in (76.2mm) in diameter is to be machined at 90 fpm (0.5 m/sec). What spindle speed should be used?