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The lighting needs of a storage room are being met by 6 fluorescent light fixtures, each fixture containing four lamps rated at 60 W each. All the lamps are on during operating hours of the facility, which are 6 AM to 6 PM 365 days a year. The storage room is actually used for an average of 3 h a day. If the price of electricity is $0.08/kWh, determine the amount of energy and money that will be saved as a result of installing motion sensors. Also, determine the simple payback period if the purchase price of the sensor is $32 and it takes 1 hour to install it at a cost of $40.
we need to select an insulation material to reduce the heat loss from a tubing 0.5 cm in outer diameter. the outside of
the san vicente reservoir north of san diego currently has a residence time for water of approximately 14 days. the
aan 8-inch pitch diameter steel gear 3 inches thick face width is pressed onto a 2 inch diameter steel shafte30000000
the top cycle of a combined cycle power plant has a pressure ratio of 12. air enters the compressor at 300 k at a rate
Members AB and BC of the truss shown are made of the same alloy. It is known that a 20-mm-square bar of the same alloy was tested to failure and that an ultimate load of 120 kN was recorded. If a factor of safety of 3.2 is to be achieved for both ..
Discontinuities in rectangular waveguide. A very long rectangular waveguide is filled with two materials as shown in Figure 17.30. A TM wave propagates in the waveguide.
SAE 30 oil at 60°F is pumped through a 3-ft-diameter pipeline at a rate of 5700 gal/min. A model of this pipeline is to be designed using a 2-in.-diameter pipe and water at 60°F as the working fluid. To maintain Reynolds number similarity between ..
Two round, 3cm diameter bars are made of SAE 1030HR (hot-rolled) steel but are different lengths (15 cm and 60 cm, respectively). Compare the load supporting capability of the three bars if they are loaded in compression and the ends are assumed to b..
a modified brayton cycle is to be analyzed using the air-standard assumption with constant specific heats at a
a regenerative steam power cycle has a closed feedwater heater that heats 20 kgs of water from 100degc 20 mpa to
a 3-phase 400 v 50 hz 6 pole cage induction motor of rating 20 kw with slip at rated load of 4 has a starting toque
Consider the flow of a uniform stream of speed V in the x-direction and a sink of strength Q at the origin. Find the stagnation point(s) and the equation of the stagnation streamline. Sketch (freehand) the flow streamlines
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