What is the Carnot efficiency of a typical geothermal plant and its power capacity in MW? The average heat supply from the geothermal production well is around 1. 92 x 107 kW. The average ambient temperature and maximum temperature are 21 "C and 88 "C, respectively. power
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- What is the maximum allowable capacitance between a 480Vac 60 Hz industrial power supply and the surrounding metal cabinet so that a person with 3 kOhm resistance through their body to ground will not experience more than 10 mA of current if they touch the cabinet?An automotive alternator is rated 500 VA and20 V. It delivers its rated voltamperes at a powerfactor of 0.85. The resistance per phase is 0.05Ω , andthe field takes 2 A at 12 V. If the friction and windageloss is 25 W and the core loss is 30 W, calculate thepercent efficiency under rated conditions.An industrial assembly hall is continuously lightedby one hundred 40-W mercury vapor lamps suppliedby a 120-V and 60-Hz source with a power factor of0.65. Due to the low power factor, a 25 percent penaltyis applied at billing. If the average price of 1 kWh is$0.01 and the capacitor’s average price is $50 permillifarad, compute after how many days of operationthe penalty billing covers the price of the power factorcorrection capacitor. (To avoid penalty, the powerfactor must be greater than 0.85.)
- A wind turbine system has an average overall efficiency of 25%, what is the size of wind rotor is required if 100 watt DC generator will be driven? The average expected wind velocity at the rotor is 8 m/s.A 55000 kW thermal plant of National Power Corporation delivers an annual output of 238000000 kw-hr with a peak load of 44 MW. What is the capacity factor? a. 49.4% b. 42.4 % c. 48.2% d. 44.6%The Answer is not 63.74.Two heating elements which is 500 ohms and 250 ohms are connected in series with temperature coefficients of 0.001 and 0.003 ohms per °C, respectively at 20°C and heated at 50°C, Calculate the effective temperature coefficient of the combination at 20°C
- A steam turbine generator is designed to generate 5.5MW of electrical power at a 6300V, 50HZ and 0.95 lag. The steam turbine requires 28 tons per hour of a high-pressure steam of temperature and pressure of 4000C and 40 bar. The steam turbine is a condensing type. If the temperature of the exhaust steam is 400 C (a).Calculate the efficiency of the steam turbine (b)What are the three (3) major advantages and disadvantages of the steam turbine? (c )What are the methods of improving efficiency of the Brayton cycle?Q 03: Briefly discuss, how the energy consumptions for operations of a fork lifter could be justified. Suppose that a fork lifter has a total energy consumption of 150 W.Hr. The total trips of the vehicle are 375. How the battery duty cycle may be calculated in this case?An electric water heater has a rating of 1 kW, 230 V. The coil used as the heating element is 10 m long and has a resistivity of 1.724 x 10-6 ohm - cm. Determine the required diameter of the wire in mils?
- A wind turbine gives maximum output power of 1MW at a wind speed of 15m/s. Refer to the above wind turbine choose the correct statement a. The wind rotor swept area is 400square meters. b. The wind rotor swept area is 835 square meters. c. The wind rotor swept area is 700 square meters d. The wind rotor swept area is 638 square meters.Q: Suppose that a fork lifter has a total energy consumption of 150 W.Hr. The total trips of the vehicle are 375. How the battery duty cycle may be calculated in this case?A 240-V rms 60-Hz supply serves a load that is 10 kW (resistive), 15 kVAR (capacitive), and 22 kVAR (inductive). What is the current drawn from the supply in amperes? And what is the required capacitor rating in microfarads required to improve the power factor to 0.96 ?