Mechanical Engineering - IC Engines and Nuclear Power Plants - Discussion
Discussion Forum : IC Engines and Nuclear Power Plants - Section 1 (Q.No. 30)
30.
The thermal efficiency of diesel engines is about
Answer: Option
Explanation:
The thermal efficiency of diesel engines is about 30-50%. This means that for every 100 units of fuel energy input, the engine is able to convert 30-50 units of that energy into useful work. The remaining energy is lost as heat or exhaust.
The maximum theoretical efficiency of a diesel engine is about 70%. However, this is rarely achieved in practice due to factors such as friction, heat loss, and incomplete combustion.
Discussion:
36 comments Page 2 of 4.
Anomie said:
5 years ago
Thermal efficiency of the diesel engine is 30% to 35% while 70% is wasted.
Rajat said:
5 years ago
It is Not exceed 50%.
Rishab Sud said:
5 years ago
A typical diesel automotive engine operates at around 30% to 35% of thermal efficiency. About 65-70% is rejected as waste heat without being converted into useful work, i.e. work delivered to wheels.
Joe Sally said:
5 years ago
Since the higher the compression ratio of an engine the higher the thermal efficiency, so diesel engines generally have a better fuel efficiency than petrol engines. To power a similar-sized vehicle, a diesel engine will be about 15% - 25 % better on fuel efficiency than a petrol engine. The petrol engine has usually efficiency of around 30-35%, hence diesel cycle efficiency due to better compression ration is 40-45% We can take 50%, not 70% FOR SURE.
Vinay said:
5 years ago
Maximum 35%.
Pritam said:
5 years ago
Maximum 30 to 35%.
Kamlesh Gadhavi said:
5 years ago
40% is the right one.
Darshan said:
4 years ago
For petrol 25%.
And for diesel 30 to 35%.
And for diesel 30 to 35%.
JANAK said:
9 years ago
Thermal efficiency of diesel engine is 35%.
Dev said:
1 decade ago
If the compression ratio of diesel engine is high then thermal efficiency of diesel engine is also high.
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