--- title: "Diesel layout with its five systems" subject: "Power Plant Equipment" chapter: 5 key: "semester_7/power_plant_equipment:diesel-layout-five-systems" source: https://www.bctengineer.com/q/semester_7/power_plant_equipment/diesel-layout-five-systems site: BCT Engineering --- # Diesel layout with its five systems Power Plant Equipment · Chapter 5: Diesel Power Plant - Asked in: 2075 Chaitra, 10 marks - Video: [Layout Of Diesel Power Plant - Gas Turbine and Diesel Power Plant - Conventional & NPG](https://www.youtube.com/watch?v=KyR8WddQ_Ko) — Ekeeda - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_7/power_plant_equipment/diesel-layout-five-systems - Whole chapter: https://www.bctengineer.com/md/semester_7/power_plant_equipment/chapter-5 ## Question Make a layout of a diesel power plant showing the following systems and briefly discuss about them: (i) Air intake system (ii) Cooling system (iii) Fuel supply system (iv) Lubrication system (v) Exhaust system ## Short answer A diesel plant uses five systems: air intake supplies filtered, often turbocharged air; cooling removes jacket heat through water and heat exchanger; fuel supply stores, filters, and injects oil; lubrication pumps oil under pressure through filters and cooler; exhaust discharges gases via silencer and stack, often recovering heat. ## Answer A diesel power plant is a CI engine–alternator set supported by five essential auxiliary systems: air intake, cooling, fuel, lubrication and exhaust (plus starting and governing). #### Layout ```text Air filter --> Supercharger | Bulk tank -> Filter -> Day tank -> Inj. pump | | v v +-------------------+ Lube tank->pump--> | DIESEL ENGINE |==> ALTERNATOR ->filter->cooler +-------------------+ ^ return | | +-------------+ v | Silencer -> Stack Jacket water v Cooling tower <- Heat exchanger <- Pump ``` #### (i) Air intake system Supplies clean air for combustion. Air passes through **air filters** (oil-bath or dry type) that remove dust, then through ducts and often a **supercharger/turbocharger** that raises air density so more fuel can be burnt per stroke. Intake is placed outside the engine room, away from exhaust, and a silencer reduces suction noise. Dirty air would cause rapid wear of liners and rings. #### (ii) Cooling system Removes 25–35 % of the fuel heat that passes to cylinder walls, head and pistons. Water is pumped through the jackets, then to a heat exchanger or radiator; the heat is finally rejected in a cooling tower or spray pond. Closed (soft-water) systems are preferred to prevent scaling. Proper cooling keeps metal temperatures and lube-oil temperatures safe. #### (iii) Fuel supply system Oil from tankers goes to **bulk storage tanks**, then is transferred through filters to a **day tank**. From there the **fuel injection pump** pressurises and meters the oil, and **injectors** atomise it into the hot compressed air. Heaters are used for heavy oil. Governor controls the quantity injected according to load. #### (iv) Lubrication system An oil pump draws oil from the sump/tank and supplies it under pressure through **filters** and an **oil cooler** to main bearings, crank pins, gudgeon pins, camshaft and cylinder walls. Oil reduces friction and wear, cools parts, seals the piston rings and carries away dirt. Oil drains back to the sump and is recirculated. #### (v) Exhaust system Discharges hot exhaust gases from the cylinders to the atmosphere through the **exhaust manifold, silencer (muffler) and stack**. The silencer reduces noise; flexible joints isolate vibration and allow expansion. The exhaust heat (about 30 % of fuel energy) may be recovered in a **waste-heat boiler** or used to drive the turbocharger. The stack must be high enough to disperse fumes. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. Why is a supercharger/turbocharger used in the air intake system? A. To cool the exhaust B. To raise air density so more fuel can be burnt per stroke C. To filter the fuel D. To start the engine Answer: B. Denser air allows more fuel to burn per stroke, giving more power. (Key point: Supercharger purpose) 2. What would unfiltered air cause? A. Lower exhaust noise B. Rapid wear of liners and rings C. Higher injection pressure D. Cooler engine Answer: B. Dust causes rapid wear of liners and rings, so oil-bath or dry filters are used. (Key point: Why filter air) 3. Which sequence describes the fuel system? A. Day tank, bulk tank, injector, pump B. Bulk tank, filter, day tank, injection pump, injectors C. Injector, pump, bulk tank D. Day tank, silencer, injector Answer: B. Fuel goes from bulk storage through filters to the day tank, then to the injection pump and injectors. (Key point: Fuel path) 4. What does the lubrication system do with the oil? A. Burns it in the cylinder B. Pumps it from the sump through filter and cooler to bearings and cylinder walls, then drains back C. Mixes it with fuel D. Discharges it to the stack Answer: B. Oil is pressurised, filtered and cooled, lubricates, seals, cleans, and returns to the sump. (Key point: Lubrication path) 5. What is the use of exhaust heat (about 30% of fuel energy)? A. It can be recovered in a waste-heat boiler or drive the turbocharger B. It must be wasted C. It heats the lube oil tank only D. It is fed to the alternator Answer: A. Exhaust components are manifold, silencer and stack; heat may be recovered by a waste-heat boiler or turbocharger. 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