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Assume constant specific heats where Cwater = 4.179 kJ/kg-K and CCu = 0.385 kJ/kg-K. Determine the total entropy production (kJ/K) after one hour assuming thermal equilibrium is achieved.
Determine the stream ecomomy of the system. Assume that the specific heat of the solids is 3000 J/kg K and that of water is 4,180 J/kg K.
Determine the time taken for the product to freeze if it is at its initial freezing point when it was placed in the blast freezer.
Assume constant specific heats where Cwater = 4.179 kJ/kg-K and CCu = 0.385 kJ/kg-K. Determine the final equilibrium temperature (K).
A piston-and-cylinder device contains 10 kmol of n-pentane at -35.5 C and 100 bar. How much heat must be supplied for the process to be isothermal?
During the expansion some of the water evaporates, but no heat is transferred to the cylinder. Find the temperature, pressure, and amounts of vapor, liquid, and solid water present after the expansi
Find the flow rate of air if the manometer reading is 271 mm, the relative density of alcohol is 0.8, Cd for the orifice is 0.602 and the atmospheric temperature.
You are blanking a square using a straight edge punch. If the punch is angled to be at a shear angle of 10 degrees, how much would the force be decreased?
Determine the cutoff ratio rc. Find the temperature at the end of each process of the cycle. Evaluate the efficiency of the cycle.
A hydraulic cylinder has a piston of cross sectional area, 45cm2, and a constant working fluid pressure of 2.2MPa. What is the volume displacement of the piston?
A mercury barometer in the room shows a pressure equal to a height of column of mercury of 760mm and a thermometer in the room shows a temperature of 18oC. What is the temperature of the air in the
Calibrated vibrometer output indicates a velocity amplitude (1/2 peak-to-peak) of 3.8 mm/s. Determine (a) the displacement amplitude in mm and (b) the acceleration amplitude in standard g's.
If the compressor consumes 400 W of power and the COP the refrigerator is 2.2, determine (a) the mass flow rate of the refrigerant and (b) the rate of heat rejected to the kitchen air.
Find the height of stack, in feet, necessary for a driving pressure of 0.1 psia if the outside air is at 50 degree F and the percent change in gas flow if the outside air temperature changes m 60 de
Show that the moment of inertia of a particle of mass m rotating about some point O at a distance R with and angular speed w is Io = mR^2.
It is necessary to maintain a pressure of 180 psi at the snow making machine. Determine the horsepower added to the water by the pump. Neglect minor loses.
What is the pump inlet condition for a Rankine cycle?; the heat added by the boiler (kJ/kg); the cycle efficiency; the efficiency of a Carnot cycle operating between the same temperature limits.
Air at 80F and standard atmospheric pressure flows through a furnace filter with an average velocity of 2.4 ft/s. The pressure drop across the filter is 0.06 in of water.
Estimate the average reaction rate and the reaction zone thickness. Assume the thermal conductivity of the mixture is 0.026 W/mK at 298 K and increases as a function of T1/2.
The value of the uniform wall temperature is equal to that calculated at x = 2 feet. At a location x = 4 feet, determine the heat transfer coefficient, the bulk temperature, and the heat flux.
Calculate the power required to run the refrigerator. Assumptions: r-143a is a saturated vapor at 70 deg F, the compressor operates reversibly and adiabatically.
Determine the values of the friction factor corresponding to Reynolds numbers of 5000, 12000, 20000. Does the frinction factor increase or decrease as the Reynolds number increases?
Determine the reduction in the exit temperature of the compressed air and the compressor power saved. Assume water vaporizes completely before leaving the compressor.
The refrigerant leaves the condenser at 0.7 MPa, 26 °C. Determine the rate at which heat energy is removed from the refrigerated space, in kW,
At the compressor inlet, saturated vapor enters at -10 °C, and saturated liquid leaves the condenser at 30 °C. The mass flow rate of refrigerant is 0.08 kg/s. Determine the rate of heat reje