3. You have just purchased a remote uninhabited island where you plan to give pa

Question

3. You have just purchased a remote uninhabited island where you plan to give parties lasting till late at night. You need to install an electric power system that will provide at least 4 kW of ighting. i. List and describe, in several sentences, three methods of generating power in this remote location (assuming that equipment and supplies can be transported to the island) ii. Assume that the decision has been made to produce the electric power by means of an engine- driven generator. Specifically, an engine will be direct-connected to a generator that delivers power to bulbs. Available choices are as follows: Bulbs. 60-W bulbs at 110 V. The bulbs may be connected in parallel, in series, or in combination, and the current flowing through a bulb must be above 70% of the rated current to obtain satisfactory lighting efficiency but below 110 percent of the rated current to achieve long life Engines. A choice can be made between two engines whose power deliveries at wide-open throttle are as follows Power delivery, kW, at a given s revs 30 5,6 6.9 6.4 5.6 Hint: The engine can run at a given speed and put out less power by closing the throttle. Generators. Single phase, altemating current (AC). No adjustment of output voltage is possible except by varying the speed. The frequency must be greater than 35 Hz in order to prevent flickering of the lights. Neglect the voltage drop and power loss in the transmission lines. A choice can be made between the following two generators: Output voltage, V, at given Allowable revis 30 Generator Poles EfficiencyCurrent, 10 20 40 50 40 83 50 59 3600 RPM (60 rev/s), 2 pole, gives 60 H Hint: regarding generator poles and frequency: 1800 RPM (30 res), 4 pole, gives 60 Hz Make the following design selections and specifications: Engine number Generator number Engine Generator Speed Frequency Hz Power delivered by enginekw Power delivered by generatorkw Voltage_ Current Number of bulbs and circuiting (show a wiring schematic) revs iii. Review the design and list the decision that preclude possible optimization later in the design

Explanation / Answer

Engine no - 1

Generator no- 1

Engine generator speed- 1800 rpm

Frequency- 60 Hz

Power delivered by engine-5.6KW

Power delivered by generator-10.6 KVA

Voltage-106 V

Current- 100 A

As 60.watt bulb consumes 0.5 ampere current in second , hour or continuously,

We can connect one or more number of bulb in parallel

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