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A factory uses 700.40 W standard fluorescent lamps for its lighting. The lamps are to be replaced by 34/W high-efficiency lamps that can operate on the existing standard ballasts. The standard and high-efficiency fluorescent lamps cost $1.80 and $2.50 each, respectively. The factory operates 3000 h/year, and all of the lamps operate during that period. Assuming the unit cost of electricity is 6 cents/kWh and the ballasts consume 10% of the rated power of the lamps, calculate how much energy and money will be saved as a result of switching to the high-efficiency fluorescent lamps. Then, estimate the PP assuming an interest rate of 6% and an inflation rate of 3%. Finally, calculate the levelized cost of the saved energy assuming the lamps last for 2 years.
If a heat flux of 100 W/cm2 is imposed on one of the copper surfaces, what emf would be generated by the arrangement?
a piston-cylinder assembly is fitted with stops. the assembly contains 0.1 kg of water initially at 1 mpa and 500degc.
A radial vortex in water rotates at a speed of 3 radians/sec. The center of the vortex is also moving downstream at a linear velocity of 2 ft/sec. Create a plan-view plot that shows the path line of a fluid particle that rotates at a fixed radius of ..
the 150-lb fireman is holding a hose which has a nozzle diameter of 1 in and hose diameter of 2 in. if the velocity of
a reversible power cycle operates between a reservoir at temperature th and a lower temperature reservoir at 290 k. at
Determine the formula of the complex.
Air enters a constant-area duct with MI = 2.95 and 1) = 500°R. Heat transfer decreases the outlet Mach number to M2 = 1.60. Compute the exit static and stagnation temperatures.
an axial flow compressor stage has blade rootmean and tip velocities of 150200 and 250 ms. the stage is to be designed
imagine you have three paper cups. cup 1 is covered with a tissue paper cup 2 with a plain sheet of paper and cup 3
a ball is dropped from a boat so that it strikes the surface of a lake with a speed of 16.5fts. while in the water the
an adiabatic pump operating a steady state compresses liquid water from an initial condition of p1 10 bar and t140degc
a large stationary brayton cycle gas-turbine power plant delivers a power output of 100 mw to an electric generator.
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