Table of Contents
- 1 What factors affect the efficiency of a car?
- 2 What factors affect engine performance?
- 3 What is the efficiency of an automobile?
- 4 Which factors contribute to the efficiency of cycle?
- 5 How can we increase the efficiency of an engine?
- 6 What is the most efficient and ideal engine?
- 7 How does temperature affect the thermal efficiency of an engine?
- 8 Is it possible to improve the combustion efficiency of diesel engines?
- 9 What determines how hard an engine has to work to move?
What factors affect the efficiency of a car?
Factors that affect fuel efficiency
- Driving behaviour: Rapid acceleration, speeding, driving at inconsistent speeds and even extended idling can increase your fuel consumption.
- Weather: The colder it is, the worse your fuel consumption will be.
- Weight: It’s a fact that lighter cars use less fuel.
What factors affect engine performance?
These factors include altitude, temperature and humidity. Aircraft engine performance decreases as altitude and temperature increase. In the case of high humidity, the volume of air available for combustion is reduced, causing losses in power in combustion engines.
What factors affect the efficiency of a real heat engine?
What variables affect a Heat engine’s efficiency? (and more)
- Compression Ratio (internal combustion only)
- Gear Ratio (for high torque applications)
- Working Fluid (external combustion only)
- Ambient Temperature (mainly external combustion only)
- Heat Exchanger Material (external combustion only)
What is the efficiency of an automobile?
Sadly, even with regular car maintenance such as a tune-up or an oil change, today’s gasoline engines are only around 30 to 35 percent efficient, which means roughly 65 cents out of every dollar you spend on gas goes to waste.
Which factors contribute to the efficiency of cycle?
Factors affecting efficiency of Carnot cycle – Thermodynamics
- a. temperatures (T1, T2) between which the Carnot cycle operates.
- b. net work done (Wnet)
- c. heat supplied (Q1) and heat rejected (Q2)
- d. all of the above.
What decreases the efficiency of a heat engine?
In contrast, in an internal combustion engine, the temperature of the fuel-air mixture in the cylinder is nowhere near its peak temperature as the fuel starts to burn, and only reaches the peak temperature as all the fuel is consumed, so the average temperature at which heat is added is lower, reducing efficiency.
How can we increase the efficiency of an engine?
- Run the engine fuel-lean, that is, use excess air. It is well known that fuel-lean running improves the efficiency.
- Higher compression ratio.
- We need new cycles put into practical use.
- Run the engine at optimum conditions, meaning low friction (modest engine speed) and low pumping work (air throttle more open).
What is the most efficient and ideal engine?
A Carnot engine operating between two given temperatures has the greatest possible efficiency of any heat engine operating between these two temperatures. No real heat engine can do as well as the Carnot efficiency—an actual efficiency of about 0.7 of this maximum is usually the best that can be accomplished.
What parameter characterizes the efficiency of the engine?
One way to evaluate engine efficiency is with the ratio of fuel consumption to useful power. The result of this mathematical treatment produces the term brake specific fuel consumption (bsfc).
How does temperature affect the thermal efficiency of an engine?
The greater the difference in temperature between a fuel’s combustion temperature and that of its surroundings, the lower the thermal efficiency of an engine. In other words, the greater the difference between the temperature of burning fuel and the metal and air around it, the greater the energy loss.
Is it possible to improve the combustion efficiency of diesel engines?
Particularly with heavy fuels with high-energy densities — diesel, fuel oil, bunker fuel, etc. — there are technologies available that make it possible to improve combustion efficiency dramatically.
How is the efficiency of a combustion engine measured?
The efficiency of a combustion engine is measured as the sum of thermal efficiency. Thermal efficiency is a consequence of thermodynamics. There is both a definition and a formula for thermal efficiency. According to LearnThermo.com, “Thermal efficiency is a measure of the performance of a power cycle or heat engine.”
What determines how hard an engine has to work to move?
Here’s another factor that determines how hard your engine has to work to move your vehicle. It’s easiest to think of aerodynamics as how your vehicle moves through the air. Air has many properties that are similar to liquid, and just like in water, the slipperier the shape, the easier it moves.
https://www.youtube.com/watch?v=OEzsVR5PQyo