DIESEL FUELS & DIESEL FUEL SYSTEMS

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Diesel Fuels & Diesel Fuel SystemsApplication and Installation GuideStep 2Calculate the fuel oil mix temperature (Tmix):MDT(t -1) - [(Mxfer x t)] TDT(t -1) + (MRTN x t) x (TDT(t -1)+ ∆ TENG)MDT(t -1) - (MBR x t)Where:MDT = Day tank contents at aspecific time step (lb)Mxfer = Engine transfer pumpmass flow rate (lb/min)T = Incremental time step(min)TDT(t -1) =Day tank temperature forprevious time step orstarting temperature (°F)MRTN =Engine return mass flowrate (lb/min)∆T ENG= Fuel temperature riseacross the engine (°F)MBR = Engine fuel consumption(lb/min)Values for the example calculation:MDT(t -1) = Day tank contents fromprevious time step (lb)Mxfer = 134.9 lb/minT = 60 min.TDT(t -1) =Initial day tanktemperature is used forfirst iteration, 85°FMRTN = 109.70 lb/min∆TENGMBR= 22.83°F= 25.21 lb/minTmix =[(40258.6 - (134.9)(60))(85)] + [(109.70)(60)(85 + 22.83)][40258.6 -(25.21)(60)]Tmix = 88.9°F @ t = 60 min.Page 40©2005 Caterpillar®All rights reserved.
Application and Installation GuideDiesel Fuels & Diesel Fuel SystemsThis calculation is repeated foreach increment (t).Prepare a summary table as shownin Table 7 for each increment (t).IncrementalTime (Min)MixTemperature (°F)0 85.060 88.9120 92.9180 97.1240 101.5300 106.1360 110.9420 116.0480 121.3540 126.9600 132.9660 139.3720 146.1RefillTable 7©2005 Caterpillar®All rights reserved. Page 41
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DIESEL FUELS & DIESEL FUEL SYSTEMS

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