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The hallways of a university are lit by 40 fluorescent lights, each containing two lamps rated at 60 W each. The lights are on all day and night during the year, but the building is only used from 7 a.m. to 7 p.m. 5 days per week during the year. If the price of electricity is 7 cents/kWh, estimate the amount of energy and money that could be saved by installing two motion sensors that turn off the lights when the building is not being used. Then, estimate the simple payback and the payback with a 6% effective interest rate if the price of a sensor is $50 and the cost of installation is $40.
An ideal Rankine cycle uses water as its working fluid. The mass flow rate of water through the cycle is 150 kg/s. saturated vapour enters the turbine at 15 MPa and saturated liquid enters the pump at 10 kPa. Cooling water passes through the condense..
steam at 1.0mpa and 300c with a mass flow rate of 10kgs enters an insulated turbine operating at steady state and exits
a 15 kg block b is being pulled along a smooth surface by a winch a. assume the winch is a 10 kg disc with a constant
Decorative water fountains consist of a water reservoir and underground piping to and from a pump. One such system is shown schematically in the figure. The pipe material is PVC(a table is provided). The outlet line from the pump is 18 m and the inle..
how do you plot an isentropic compression process on a pressure-enthalpy diagram? i know how to do it on a
Explore the effect of the insulation thickness on the temperature of the aluminum and the heat loss per unit tube length
Air, modeled as an ideal gas, is compressed at a steady state from 1 bar, 300 K, to 5 bar, 500k with150 kW of power input. Heat transfer occurs at a rate of 20 kW from teh air to cooling water circulating in a water jacket enclosing the compressor. N..
The heating is to be done in a mixing tank by direct injection of the steam, all of which condenses. Determine the two inlet mass flows needed to meet the desired hot water flow rate.
For a torsion test, derive equations relating the angle, ψ, between the axis of the largest principal stress and the axial direction and the angle, ψ !, between the axis of the largest principal strain and the axial direction in terms of L, r, and th..
I need help to write the procedure about how to make a Mouse Trap Powered Vehicle.(then I will finish that with my team). And you also need to help me write a lab report too. I am sure to get a good procedure and lab report. Read the instruction w..
A cold air-standard Brayton refrigeration cycle has a pressure ratio of 4 and a refrigeration rate of 15 kW. Air enters the compressor at -7oC. The high pressure air is cooled to 27 oC by rejecting heat to the surroundings. It is further cooled to -1..
find the equation pu v of a surface of revolution obtained by revolving a profile curve on the xy-plane about the
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