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If the refrigerator is reconfigured to work as a heat pump, for same COP and work input, what is heat removal rate from cold space?
The change in diameter of the specimen. Indicate an increase in diameter with a positive number and a decrease with a negative number.
Calculate the critical radius given values of -3.1 × 108 J/m3 and 25 × 10-3 J/m2, respectively, for the latent heat of fusion and the surface free energy.
What steady-state creep rate would you predict for this alloy at 600oC and 55 MPa? What useful life would you predict for this component at 600oC and 55 MPa
Determine the fatigue strength at 5 X 105 cycles. What is the predicted useful life of this component at 200 MPa? Does this material show an ENDURANCE LIMIT.
If the dislocation is pi nned at two points 1 micron apart so that it can be a Frank-Read source, what stress is needed to make it an active source?
Find the amount of energy the freezer must remove from the R-134a and the extra amount of work input to the freezer to perform the process.
Carbon dioxide at 20 degrees celsius and a pressure of 550 kpa flows through a pipe at 0.04 N/s, what would be the maximum diameter of the pipe for the flow to be turbulent?
Now the same airfoil is turned upside-down (so it becomes an airfoil with a negative camber). Calculate its lift coefficient at the same angle of attack of 5 as in part a.
Determine the outlet temperature for both the isentropic and actual compression processes. Determine the actual power input required Draw both the actual and isentro pi c processes on a well-labeled
The compressor has an isentro pi c efficiency of 95%. Assume constant specific heats for air. What is the ACTUAL outlet temperature of the air?
The average surface temperature of the plates is 10 degree in celcius. Determine the average heat transfer coefficient and the rate of ammonia condensation.
If the turbine inlet pressure in a Rankine cycle is 5MPa and the inlet temperature is 350C, determine the efficiency of the cycle if pump work is neglected.
Air is compressed in the compressor of a turbojet engine. Find mass specific enthalpy change associated with compression process.
Which has a coefficient of performance of 8. Determine whether constructing such a refrigeration unit is possible, explain.
Consider no change in heat transfer, kinetic and potential energy. Plot both the actual and isentropic processes of the turbine in T-s coordinates. Show the steam dome.
Assuming that the hole introduces a local stress concentration factor of 3, account for the failure using fracture mechanics.
Derive the scaling relation for the strain energy release rate of crack extension under fixed displacement. Clearly state the assumptions and show the steps of reasoning.
Water enters a nozzle with a circular inlet are with a diamter of 5 cm at a velocity of 3 m/s. The outlet diameter is 2 cm. Calculate the mass flow rate and the pressure difference between the inlet
5 kg/min of 25 degree Celsius water mixes with 7 kg/min of 72 degree Celsius water in a mixing chamber. Calculate the temperature and flow rate of the exit stream.
How much per vehicle should the toll be to cover the cost of the toll booth replacement project? Interest is 10%.
Assume that the coals and the steaks behave as blackbodies. Determine the initial rate of radiation heat transfer between the coals and the steaks.
Determine the maximum velocity of the flow in a given cross-section of the tube; and c) Calculate the shear stress at the wall Tube inner diameter= 3 mm.
The modulus of elasticity for beryllium oxide (BeO) having 5vol% porosity is 310GPa (45 ( 106psi). Compute the modulus of elasticity for the nonporous material.
During this compression process heat is transfered from the nitrogen, and the work done on the nitrogen is 9.15 Btu. Starting from basic principels, determine the amount of the heat transfer.