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An electric water heater having a 200-L capacity heats water from 23 to 55°C. Heat transfer from the outside of the water heater is negligible, and the states of the electrical heating element and the tank holding the water do not change significantly. Perform a full exergy accounting, in kJ, of the electricity supplied to the water heater. Model the water as incompressible with a specific heat c 5 4.18 kJ/kg ? K. Let T0 5 23°C.
the irreversible gas phase reaction a --gt 2b is conducted in an isothermal batch reactor. the reactor is charged with
Using a centrifugal pump, and a flow rate of 60 gal/min, calculate the break hp of the pump using water with a density of 62.4lbm/ft3 and do the same for a nonviscous liquid having a density of 0.85g/cm3.
a fluid has a viscosity of x nsm2 and is placed in a concentric cylinder viscometer. the gap width is g mm and the
for the stress element with sigmax 1400psi sigmay 600psi and shear 950 psi determine the average stress the maximum
an aircraft model tested in a wind tunnel produced 5 pounds of lift giving a lift coefficient of 0.7. when the actual
an ideal gas undergoes a two-step process. beginning at state 1 it is pressurized at constant volume to state 2. then
A section of a composite wall with the dimensions shown below has uniform temperatures of 200°C and 50°C over the left and right surfaces, respectively. If the thermal conductivities of the wall materials are: kA = 70 W/(m K), kB = 60 W/(m K), kc ..
(a) determine the net power developed per unit mass flowing, in kJ/kg, and the thermal efficiency for a compressor pressure ratio of 8. (b) plot the net power developed per unit mass flowing, in kJ/kg, and the thermal efficiency, each versus compr..
a hot-wire anemometer is a temperature-based instrument for measuring velocities in a flowing gas. the key component of
a refrigeration system has a coefficient of performance of 5. the heat rejection is an isothermal process at 37c. what
air flows in a round pipe at a rate of 0.015 lbmsec. the air enters the pipe at a temperature 76.8 of and a pressure
a crane is lifting concrete to a construction project where the acceleration of gravity is 31 fts2. if a 400 lbm
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