Esercise I Mrs. Sara Stewart of Milhon Industries needs to recommend a prime mov
ID: 2074090 • Letter: E
Question
Esercise I Mrs. Sara Stewart of Milhon Industries needs to recommend a prime mover Sor the following applications. Write a formal letter to the customser, Mr.Donald Sak, with the best possilble prine mover for each scenario Application A: haave A prime mover is to be installed to run the propulsion ystem or n irra. maintenanse roquirement, high gower weight ratlo and have the ahility to withstan Neca high temperatures. Horsepower requirement is 75 HI Applicatiea B: Prime mover in stati nary power plant to power an without adding large and heavy equipments like flywheels, Horsepower roquinement is 300 HP low maintenance requirements are prefered. Uaiform power generatice is required Appliestion C: Prine mover to power the draw works for a winch. Should be pornable and capable ef 175-250 HP Should fit within a 4x 4' x 6 space Application D: Prime mover powering·generator to provide a smal scale emergency power hakup for hospitals. The major concem is not size or weight, but minimal operational cost, clean operation and safety Exercise 111 Individual) Compare all the prime movers studied in lab with respect to the following criteria I. Operational cost 2. Efficiency and losses 3, Horsepower range 4. Power to weight ratio 5. Torque generated 6. Maintenance requirements Post Lab Exercise 1. How many times does a gasoline engine's piston travel up and down in 1 second at a speed of 5000 RPM? Describe positions of intake and exhaust valves in four positions of 4 3. Compare the compression ratios achieved in Diesel and Gasoline engines? 4. What does the engine designation, "V-6" mean? 5. Is it okay to use regular "leaded" gasoline engine in an "unleaded gasoline engine? 6. Compare ignition system of gasoline and Diesel Engine 7. What are two auxiliary systems present in automotive gasoline engines that are not in an automotive diesel engine? 8. In what scenarios are two stroke Gasoline engines used? 9. Why do diesel engines require more robust construction? 10. Name a prime mover that utilizes external combustion? 11. What is the typical shaft speed of a gas turbine? 12. What does the regenerative system on a gas turbine do? 23Explanation / Answer
ANSWER 1: the gasoline engine's piston moves from top dead center to bottom dead center in half rotation of crank and from bottom dead center to top dead center in another half rotation. so for a engine that is rotating at 5000 rpm, it means that, in 60 seconds, the crank rotates 5000 times. in other words, it rotates 83.333 times in a second. therefore the piston travels 83 times up and 83 times down in one second.
ANSWER 2: SUCTION STROKE- INLET VALVE (IV) OPEN, EXHAUST VALVE (EV) CLOSE, beacuse air is to be sucked during this stage
COMPRESSION STROKE- IV CLOSE, OV CLOSE - beacuse the air inside is compressed by moving piston towards the top dead center of the engine
power stroke IV CLOSE OV CLOSE
exhaust stroke - IV CLOSE OV OPEN- the exhasut gases leave the engine in this stroke
ANSWER 3: the compression ratios achieved in the diesel engine (from 14:1 to 25:1) is much more than the gasoline engines ( fro 8:1 to 12 :1). this is beacuse in diesel engines the air is to be compressed to a level that it attains a high temperature so that when the diesel is injected into the engines using injectors, it gets combusted, because there is no spark plugs to initiate the combustion process. but in gasoline engines the petrol and air gets mixed before entering the engine and therefore is a homogeneous mixture and a spark plug is present to give the initial heat for combustion.
ANSWER 4: a v-6 engine consists of two groups of three pistons each , inclined in the shape of letter V. the angle between the two arms can be 60, 90 or 180 in different car models. the inclination is present to smooth out the vibrations in comparisons to inline engines.
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