lesson fourteen. water cooling system 1.heat sources
TRANSCRIPT
LESSON FOURTEEN
WATER COOLING SYSTEM
1. HEAT SOURCES
1. HEAT SOURCES
Burning of fuel
1. HEAT SOURCES
Burning of fuel
Heat developed by compression of air
1. HEAT SOURCES
Burning of fuel
Heat developed by compression of air
Frictional heat
1. HEAT SOURCES
Burning of fuel
Heat developed by compression of air
Frictional heat
2. HEAT DISTRIBUTION
1. HEAT SOURCES
Burning of fuel
Heat developed by compression of air
Frictional heat
2. HEAT DISTRIBUTION
1/3 = converted into useful work ( transferred into mechanical energy / BHP.
1. HEAT SOURCES
Burning of fuel
Heat developed by compression of air
Frictional heat
2. HEAT DISTRIBUTION
1/3 = converted into useful work ( transferred into mechanical energy / BHP.
1/3 = lost as exhaust gases
1. HEAT SOURCES
Burning of fuel
Heat developed by compression of air
Frictional heat
2. HEAT DISTRIBUTION
1/3 = converted into useful work ( transferred into mechanical energy / BHP.
1/3 = lost as exhaust gases
1/3 = lost for cooling / absorbed by metallic walls of the combustion chamber.
1. HEAT SOURCES
Burning of fuel
Heat developed by compression of air
Frictional heat
2. HEAT DISTRIBUTION
1/3 = converted into useful work ( transferred into mechanical energy / BHP.
1/3 = lost as exhaust gases
1/3 = lost for cooling / absorbed by metallic walls of the combustion chamber.
3. OVERHEATING
1. HEAT SOURCES
Burning of fuel
Heat developed by compression of air
Frictional heat
2. HEAT DISTRIBUTION
1/3 = converted into useful work ( transferred into mechanical energy / BHP.
1/3 = lost as exhaust gases
1/3 = lost for cooling / absorbed by metallic walls of the combustion chamber.
3. OVERHEATING
Breakdown of L.O. film
1. HEAT SOURCES
Burning of fuel
Heat developed by compression of air
Frictional heat
2. HEAT DISTRIBUTION
1/3 = converted into useful work ( transferred into mechanical energy / BHP.
1/3 = lost as exhaust gases
1/3 = lost for cooling / absorbed by metallic walls of the combustion chamber.
3. OVERHEATING
Breakdown of L.O. film
Loss in material strenght
1. HEAT SOURCES
Burning of fuel
Heat developed by compression of air
Frictional heat
2. HEAT DISTRIBUTION
1/3 = converted into useful work ( transferred into mechanical energy / BHP.
1/3 = lost as exhaust gases
1/3 = lost for cooling / absorbed by metallic walls of the combustion chamber.
3. OVERHEATING
Breakdown of L.O. film
Loss in material strenght
Excessive stresses due to unequal temperatures
1. HEAT SOURCES
Burning of fuel
Heat developed by compression of air
Frictional heat
2. HEAT DISTRIBUTION
1/3 = converted into useful work ( transferred into mechanical energy / BHP.
1/3 = lost as exhaust gases
1/3 = lost for cooling / absorbed by metallic walls of the combustion chamber.
3. OVERHEATING
Breakdown of L.O. film
Loss in material strenght
Excessive stresses due to unequal temperatures
Faliure to maintain proper clearances between running parts.
4. COOLANTS
4. COOLANTS
Fresh water
4. COOLANTS
Fresh water
Luboil
4. COOLANTS
Fresh water
Luboil
5. COOLING WATER TEMPERATURE
4. COOLANTS
Fresh water
Luboil
5. COOLING WATER TEMPERATURE
5.1 The temperature should be kept as high as possible.
4. COOLANTS
Fresh water
Luboil
5. COOLING WATER TEMPERATURE
5.1 The temperature should be kept as high as possible.
5.2 If to high, it will cause boiling of water and formation of scale deposits ( incrustration )
4. COOLANTS
Fresh water
Luboil
5. COOLING WATER TEMPERATURE
5.1 The temperature should be kept as high as possible.
5.2 If to high, it will cause boiling of water and formation of scale deposits ( incrustration )
5.3 If to low, it will lead to condensation of combustion gases on the liner surfaces.
4. COOLANTS
Fresh water
Luboil
5. COOLING WATER TEMPERATURE
5.1 The temperature should be kept as high as possible.
5.2 If to high, it will cause boiling of water and formation of scale deposits ( incrustration )
5.3 If to low, it will lead to condensation of combustion gases on the liner surfaces.
5.3.1 Product of condensation may:
4. COOLANTS
Fresh water
Luboil
5. COOLING WATER TEMPERATURE
5.1 The temperature should be kept as high as possible.
5.2 If to high, it will cause boiling of water and formation of scale deposits ( incrustration )
5.3 If to low, it will lead to condensation of combustion gases on the liner surfaces.
5.3.1 Product of condensation may:
contain acids causing corrosion
4. COOLANTS
Fresh water
Luboil
5. COOLING WATER TEMPERATURE
5.1 The temperature should be kept as high as possible.
5.2 If to high, it will cause boiling of water and formation of scale deposits ( incrustration )
5.3 If to low, it will lead to condensation of combustion gases on the liner surfaces.
5.3.1 Product of condensation may:
contain acids causing corrosion
cause so called cold sludge in the L.O. increasing wear in all moving parts
6. COOLING WATER TREATMENT & CONSEQUENCES
6. COOLING WATER TREATMENT & CONSEQUENCES
If the cooling water is not properly treated, the closed cooling systems may undergo fouling, formation of deposits ( preventing or disturbing the heat transfer ). The deposit consists of loose sludge and solid particles.
6. COOLING WATER TREATMENT & CONSEQUENCES
If the cooling water is not properly treated, the closed cooling systems may undergo fouling, formation of deposits ( preventing or disturbing the heat transfer ). The deposit consists of loose sludge and solid particles.
Removal: mechanically ( first brushed or rinsed off with water ) or chemically.
6. COOLING WATER TREATMENT & CONSEQUENCES
If the cooling water is not properly treated, the closed cooling systems may undergo fouling, formation of deposits ( preventing or disturbing the heat transfer ). The deposit consists of loose sludge and solid particles.
Removal: mechanically ( first brushed or rinsed off with water ) or chemically.
Narrow spaces are chemically cleaned.
6. COOLING WATER TREATMENT & CONSEQUENCES
If the cooling water is not properly treated, the closed cooling systems may undergo fouling, formation of deposits ( preventing or disturbing the heat transfer ). The deposit consists of loose sludge and solid particles.
Removal: mechanically ( first brushed or rinsed off with water ) or chemically.
Narrow spaces are chemically cleaned.
Limestone deposits can be cleaned with acid solution.
6. COOLING WATER TREATMENT & CONSEQUENCES
If the cooling water is not properly treated, the closed cooling systems may undergo fouling, formation of deposits ( preventing or disturbing the heat transfer ). The deposit consists of loose sludge and solid particles.
Removal: mechanically ( first brushed or rinsed off with water ) or chemically.
Narrow spaces are chemically cleaned.
Limestone deposits can be cleaned with acid solution.
7. WATER COOLING SYSTEMS
6. COOLING WATER TREATMENT & CONSEQUENCES
If the cooling water is not properly treated, the closed cooling systems may undergo fouling, formation of deposits ( preventing or disturbing the heat transfer ). The deposit consists of loose sludge and solid particles.
Removal: mechanically ( first brushed or rinsed off with water ) or chemically.
Narrow spaces are chemically cleaned.
Limestone deposits can be cleaned with acid solution.
7. WATER COOLING SYSTEMS
Large slow speed, two stroke engines have 2 separate closed cooling circuits.
6. COOLING WATER TREATMENT & CONSEQUENCES
If the cooling water is not properly treated, the closed cooling systems may undergo fouling, formation of deposits ( preventing or disturbing the heat transfer ). The deposit consists of loose sludge and solid particles.
Removal: mechanically ( first brushed or rinsed off with water ) or chemically.
Narrow spaces are chemically cleaned.
Limestone deposits can be cleaned with acid solution.
7. WATER COOLING SYSTEMS
Large slow speed, two stroke engines have 2 separate closed cooling circuits.
A header or expansion tank allows venting of the system. The header has connections from engine discharge & pump suction line.
6. COOLING WATER TREATMENT & CONSEQUENCES
If the cooling water is not properly treated, the closed cooling systems may undergo fouling, formation of deposits ( preventing or disturbing the heat transfer ). The deposit consists of loose sludge and solid particles.
Removal: mechanically ( first brushed or rinsed off with water ) or chemically.
Narrow spaces are chemically cleaned.
Limestone deposits can be cleaned with acid solution.
7. WATER COOLING SYSTEMS
Large slow speed, two stroke engines have 2 separate closed cooling circuits.
A header or expansion tank allows venting of the system. The header has connections from engine discharge & pump suction line.
A heater is fitted with by pass to warm the engine when necessary.
Cylinder jacket system
Cylinder jacket system
Water → lower end of the jacket → cylinder cover → exhaust valve cages
→ turbocharger → turbine cooling spaces → air separator → main discharge.
Cylinder jacket system
Water → lower end of the jacket → cylinder cover → exhaust valve cages
→ turbocharger → turbine cooling spaces → air separator → main discharge.
The piston cooling system
Cylinder jacket system
Water → lower end of the jacket → cylinder cover → exhaust valve cages
→ turbocharger → turbine cooling spaces → air separator → main discharge.
The piston cooling system
Water → piston cooling tank → piston water cooler → piston cooling connections → return by gravity to supply tank
