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A GDHS provides heat from the harvested thermal energy that is available at 80°C and a flow rate of 200 kg/s. At the central station, the heat exchanger that recirculates the water through the geothermal loop is placed while the reinjected water temperature is 50°C. The power consumption to run the pumps is 150 kW. The heat exchanger loses 1% of thermal energy through insulation. In the distribution network, hot water is circulated at a rate of 80 kg/s with the associated electricity consumption of 35 kW and has the maximum temperature of 70°C. The hot fluid reaches the user's location with 65°C temperature and leaves it with 55°C. An amount of 7% of the delivered heat at the user's location is lost due to imperfect insulation. Calculate the energy and exergy efficiency of the system and its components.
v(t)=20te^( -40t ) and i(t)=50te^( -40t ) for t>=0 both v and i are zeros for i
A 50-Hz synchronous salient pole generator is driven by a hydro-electric turbine at a speed of 125 rpm. There are 576 stator slots with two conductors per slot. The air-gap diameter is 6.1 m and the stator length is 1.2 m. The sinusoidally distrib..
Why Motor rated in kW/Horsepower instead of kVA
1. The response of a LTI system to a step input, x(t) = U(t) is:
The voltage and current at the terminals of the circuit element are zero for t
An emitter follower, when driven from a 10 kohm source, was found to have an output resistance Rout of 200 ohm. The output resistance increased to 300 ohm when the source resistance was increased to 20 kohm.
A 3-phase, 440VAC, 6-pole, 60Hz, wye connected induction motor takes 30KVA at .8 power factor lagging, and runs at a slip of 3.5% at full load. The stator copper losses are 500W, and the rotational losses are 350W.
How might you connect them with one wire? Show the path of the current in each case.
The demonstration would end with the opening of a valve that removed the vacuum and allowed the hemispheres to separate. Suppose that the diameter of the sphere is 50 cm and the sphere is completely evacuated. The sphere is hung from the ceiling a..
If not, why? If yes, what properties of the emitted photoelectrons will be different from the case of the infrared illumination?
If the same power is to be supplied to the same consumer by two wire d.c. system by a new line having a total resistance of 0.05 ohm and if the allowable voltage drop is 25%, calculate the d.c. supply voltage.
The trees can be harvested early at reduced yield: the net profit is then $250T per $1,000 initial investment, for T in years. To the nearest whole year, at what T is the rate of return largest
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