All Questions
Tagged with automotive-engineering thermodynamics
12
questions
0
votes
3
answers
224
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Any real heat engines based on the Carnot cycle? (or an equally efficient cycle)
Most practical heat engines are based on ideal cycles whose processes are different from the Carnot cycle (eg; constant pressure or constant volume heat addition instead of isothermal). I understand ...
- 1
2
votes
1
answer
138
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Why does a newer car have a bigger engine and produce less power?
I was looking at two cars that friends have, and I was comparing the specs, and don't understand what is going on.
One is a 2017 7 seater Citroën C4, which has a 1.2L 3-cylinder petrol engine, ...
- 123
4
votes
3
answers
148
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Improving ac efficiency in car
I live in Oklahoma. HOT in summer.
I drive a small car. Honda Fit.
Seems to me, a smaller cabin would cool faster than a larger one.
If I "made my car cabin smaller," would the ac work ...
- 41
1
vote
1
answer
70
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What is basic knowledge wanted from a bachelor mechanical engineering student before joining? [closed]
At the moment, I just finished my senior school year and in a few months, I will be studying mechanical engineering as bachelor degree. However, I don’t like to waste my time and want to use this time ...
- 11
0
votes
3
answers
198
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Why coasting is not used to save fuel?
Why a technology like freewheeling not used in cars to save fuel? We all know that when we move to neutral gear (coasting), the car travels farther than when it is in gear because there is no engine ...
- 103
2
votes
1
answer
2k
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Work calculation in a thermodynamics cycle process
To calculate work in a cyclic process (say Carnot cycle) we find area under p-v curve,or use net heat transfer= net work done.
Why won't we simply add work calculated in each process of a cycle,like ...
- 319
2
votes
1
answer
176
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Effect of Pressure on Combustion efficiency (of hydrogen) in excess air
Can somebody explain relation between combustion efficiency and pressure in lean mixtures using any kind of chart or mathematical equations?
At first glance I thought, combustion efficiency increases ...
- 187
1
vote
0
answers
50
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Would an afterburner on a turbine drastically improve acceleration lag?
A little bit of context. My friends and I were watching the "Dark Knight Rises" and a discussion about the Batmobiles ensued. I, being a former ME student, said it was stupid that batman has a turbine ...
- 111
2
votes
4
answers
648
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Why not drive an air source heat pump domestic heating system with an auto engine?
Theses are my thoughts on the question. I can't find an answer to "why not?". It there something I am missing, or are auto manufacturers simply too focussed on cars only?
The automotive industry has ...
- 121
2
votes
1
answer
2k
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What are the limiting factors on diesel engine compression ratios?
Higher compression ratios in internal combustion engines generally improve the engine's fuel efficiency. But diesel engines don't seem to go above a ratio of 25 or so. What is the limiting factor for ...
- 254
2
votes
6
answers
771
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Why isn't it possible to build a car moved by wind power?
So, first of all, I am a High School student and I wanted you to explain me something (in a more "concrete" way, if you know what I mean): I had an idea the other day to make a car with a wind turbine ...
- 21
0
votes
1
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What affects an internal-combustion engine's efficiency?
For a gasoline internal-combustion engine, used in accordance with the manufacturer's instructions (specified quality oil, fuel, etc. used), what changes the efficiency of the motor?
For example at ...
- 366