Question
question 1
Consider the system below. The following reaction occurs within the combustion chamber: CH4, + 2 O2 rightarrow C02 + 2 H20 Assume that the combustion achieves 100% conversion and no chemical is provided in excess. Show how the first law would reduce for this combustion process. What is the heat lost or gained from this process? Assume that the system acts reversibly. Because, you know, why not. it might. If you focus only outside the chamber and the pipelines, what is the change on the entropy of the surroundings if the surroundings are at a temperature of 1200 K? Realistically, what should we be also accounting for with the oxygen stream, if this was a real- world combustion chamber? Complete a drawing of an open-cycle gas-turbine engine that would include the combustion chamber above, making sure to label any heat input or work output. What would changes would you suggest making to the drawing in part (e) if you wanted to increase its effectiveness?
Explanation / Answer
a) heat release from combustion of ch4 & o2 -
heat release(Q) =
internal energy of h20 at 400K +
internal energy of co2 at 400K -
internal energy of ch4 at 298K -
internal energy of o2 at 400K
