Compression Ignition Engines: Converting kmol/kmol to kmol/kg Fuel

In summary, a Compression Ignition Engine is a type of internal combustion engine where fuel is ignited by compressing the air-fuel mixture. Kmol/kmol is a unit for expressing molar ratios, specifically the ratio of air to fuel in this case. Converting kmol/kmol to kmol/kg fuel is important for optimizing engine performance and fuel efficiency. To convert, divide the kmol/kmol ratio by the molar mass of the fuel in kg/mol. The most commonly used fuels in Compression Ignition Engines are diesel and biodiesel, with other options including kerosene and vegetable oils.
  • #1
VooDoo
59
0
Hey guys,

Just trying to understand this piece of information I have been given. It is for a compression ignition engine.

I can see where they get the 115.954 kmol/kmol fuel and 120.204 kmol/kmol fuel from but don't understand how to change the units 0.7027 kmol/kg fuel and 0.7285 kmol/kg fuel. They seem to divide kmol/kmol fuel by 165...but don't know why.

http://img245.imageshack.us/img245/1729/chemyf4.jpg
 
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  • #2
They're converting from kilomoles to kilograms, so they're dividing by the molecular weight of dodecane (165 g/mol).
 
  • #3
ahh thanks a lot! Cant believe it was that simple
 

1. What is a Compression Ignition Engine?

A Compression Ignition Engine is a type of internal combustion engine in which the fuel is ignited by the heat generated from compressing the air-fuel mixture in the combustion chamber.

2. What is kmol/kmol?

Kmol/kmol is a unit for expressing the molar ratio of two substances. In this case, it represents the ratio of the number of moles of air to the number of moles of fuel in the air-fuel mixture.

3. Why is it important to convert kmol/kmol to kmol/kg fuel?

Converting kmol/kmol to kmol/kg fuel is important in order to accurately determine the fuel-to-air ratio in the combustion process. This information is crucial for optimizing engine performance and fuel efficiency.

4. How do you convert kmol/kmol to kmol/kg fuel?

To convert kmol/kmol to kmol/kg fuel, you need to know the molar mass of the fuel. Then, divide the kmol/kmol ratio by the molar mass of the fuel in kg/mol. The resulting value is the kmol/kg fuel ratio.

5. What are the commonly used fuels in Compression Ignition Engines?

The most commonly used fuels in Compression Ignition Engines are diesel and biodiesel. However, other fuels such as kerosene and vegetable oils can also be used in these engines.

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