Combustion Thermodynamics Explained — Lesson 1

This lesson covers the concept of combustion thermodynamics, focusing on the calculation of standard heat of combustion, product composition, and standard heat of reaction. It provides a detailed walkthrough of several problems involving different scenarios such as burning ethanol in a furnace, a constant pressure process with gaseous fuel, and burning a liquid fuel with dry air. The lesson also explains how to calculate the lower and higher heating values of a fuel. For instance, it demonstrates how to determine the standard heat of combustion per kilogram of fuel and oxygen, and how to calculate the higher heating value by considering the condensation of water vapor produced during combustion.

Video Highlights

00:23 - Problem 1: Calculation of product composition and standard heat of combustion for ethanol
10:53 - Problem 2: Calculation of heat of combustion for gaseous ND
23:18 - Problem 3: Calculation of standard heat of combustion for a fuel gas mixture
33:22 - Problem 4: Calculation of standard heat of reaction and higher heating value for liquid Alan

Key Takeaways

- Combustion thermodynamics involves the calculation of standard heat of combustion, product composition, and standard heat of reaction.
- The standard heat of combustion can be calculated by determining the enthalpy of formation of the fuel and the products.
- The product composition can be determined by balancing the chemical equation of the combustion process.
- The standard heat of reaction is calculated by subtracting the enthalpy of the reactants from the enthalpy of the products.
- The lower and higher heating values of a fuel can be calculated by considering the state of water (vapor or liquid) produced during combustion.
- The difference between the lower and higher heating values is the latent heat of the water.