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Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
Internal combustion engine power plant
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Internal combustion engine power plant

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  1. Diesel Engine Power PlantFuel tankEngineGeneratorCoolingTowerFuelPumpCooling WaterPumpAir inAir out
  2. Four-Stroke Cycle Engine: An engine that completes one cycle in tworevolutions of the camshaft.IntakeCompressionPowerExhaustintake compression power exhaust
  3. Two-Stroke Cycle Engine: An engine that completes one cycle in onerevolution of the camshaft.Intake & CompressionPower & ExhaustExhaust port Exhaust portIntake port Intake portIntake & Compression Power & Exhaust
  4. Engine Performance1. Heat Supplied by Fuel (QS)QS = mF x HV KJ/hrWhere: mf – fuel consumption in kg/hrHV – heating value of fuel in KJ/kgKW4(60)NnLDPIP2miπ=2. Indicated Power (IP)Where: Pmi – indicated mean effective pressure, KPaL – length of stroke, mD – diameter of bore, mN = (RPM)/2 For 4-stroke single actingN = (RPM) For 4-stroke double actingN = (RPM) For 2-stroke single actingN = 2(RPM) For 2-stroke double acting
  5. KW4(60)NnLDPBP2mbπ=3. Brake Power (BP)KW60,000TN2BPπ=Where: Pmb – brake mean effective pressure, KPaL – length of stroke, mD – diameter of bore, mN = (RPM)/2 For 4-stroke single actingN = (RPM) For 4-stroke double actingN = (RPM) For 2-stroke single actingN = 2(RPM) For 2-stroke double actingWhere: T – brake torque in N-mN – no. of (RPM)
  6. 4. Friction Power (FP)FP = IP - BP5. Indicated Mean Effective Pressure (Pmi)KPaLSAPmi =Where: A’ – area of indicator card, cm2S – spring scale, KPa/cmL’ – length of indicator card, cm6. Brake Torque (T)T = (P – tare)R N-mWhere: P – gross load on scale, Ntare – tare weight, NR – length of brake arm, m
  7. 7. Piston Speed (PS)PS = 2LN m/min8. Displacement Volume (VD)secmPBPVsecmPIPVsecm4(60)NnLDV3mbD3miD32D==π=9. Specific Fuel Consumptiona. Indicated Specific fuel consumptionhr-KWkgIPmm Ffi =
  8. b. Brake Specific fuel consumptionhr-KWkgBPmm Ffb =c. Combined Specific fuel consumptionhr-KWkgGPmm Ffc =Where: GP – Generator power10. Heat Rate (HR)a. Indicated Heat Rate (HRi)hr-KWKJIPQHR SI =
  9. b. Brake Heat Rate (HRb)hr-KWKJBPQHR Sb =c. Combined Heat Rate (HRc)hr-KWKJGPQHR Sc =11. Generator Speed (N)RPMn120f=NWhere: n – number of generator poles (usually divisible by 4)
  10. 12. Mechanical Efficiency (ηm)100%xBPGP=gη100%xIPBP=mη13. Generator Efficiency (ηg)14. Indicated Thermal Efficiency (ei)100%xQ3600(IP)eSi =15. BrakeThermal Efficiency (eb)100%xQ3600(BP)eSb =
  11. 16. Combined Thermal Efficiency (ec)100%xQ3600(GP)eSc =17. Indicated Engine Efficiency (ηi)100%xeeii =η18. Brake Engine Efficiency (ηb)100%xeebb =η19. Combined Engine Efficiency (ηc)100%xeec=ηWhere: e – cycle thermal efficiency
  12. 20. Volumetric Efficiency (ηv)100%xVolumentDisplacemendrawnairofvolumeActualηv =shhsshTTBBPP =21. Correction Factor for Non Standard Condition Considering Pressure and Temperature Effects Considering Temperature Effects aloneshshTTPP =
  13.  Considering Pressure Effects alonehsshBBPP =Note: From US Standard AtmosphereK10006.5h-TTHgmm100083.312hBBshsh°=−=Where:P – power, KWB – pressure, mm HgT – temperature,°Kh – elevation, metersSubscript:s – refers to sea levelh – refers to the elevation
  14. ENGINE HEAT BALANCEQs = Q1 + Q2 + Q3 + Q4Where:Q1 – heat converted to useful workQ2 – heat loss to cooling waterQ3 – heat loss due to exhaust gasesQ4 – heat loss due to friction, radiation and unaccounted forQ1 = 3600(BP) KJ/hrQ2 = mwCpw(tw0 – tw1) KJ/hrQ3 = Qa + QbQa = mgCpg(tg – ta) KJ/hrQb = mf(9H2)(2442) KJ/hrQ4 = Qs – (Q1 + Q2 + Q3) KJ/hr
  15. EngineQsQ2 Q3Q1Q4Qs = Q1 + Q2 + Q3 + Q4 + Q5

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