# Help in trying to setup an equation

1. Jun 14, 2010

### Joe_K

Here is what I am trying to do. I want to tell which of the following two options will give me a cooler charge air temperature into my car's engine.

The turbocharger on the engine is pushing 42 lb/min of airflow into the engine, which first goes through an intercooler in order to cool the charge air temperature, which ENTERS the intercooler at a high temperature ((Ti) approx. 350 degrees F., but this is a rough estimate).

The intercooler is made of aluminum, and is cooled by ambient air, which dissipates heat via fins on the intercooler. The total internal volume of the intercooler is 318.5 in^3.

The outlet temperature (Tf) is 130 degrees F.

Now, what I am trying to figure out is if injecting a 50/50 mixture of liquid methanol/water would decrease the final temperature (Tf) more than the intercooler would. Basically, which provides better cooling?

The injection rate of the methanol/water mixture would be 175 mL/min.

The help I need involves setting up the problem. Are there any data that I am missing that will be required in order to accurately calculate which will cool the air better? Any help in setting up the problem would be appreciated, thanks.