Understanding Pyrometric Processes — Lesson 1

This lesson covers the concept of pyrometric processes, focusing on the calculation of relative humidity, partial pressure of dry air, and the humidity ratio. It explains how to use steam tables to find saturation pressure and how to use a pyrometric chart to retrieve other values. The lesson also discusses the calculation of specific humidity, mass of dry air, and dew point temperature. It further explains how to calculate the volume occupied by a gas mixture and how to determine the state of a system after heating. The lesson concludes with a detailed walkthrough of a complex problem involving constant volume heating.

Video Highlights

00:23 - Problem 1: Calculation of relative humidity, partial pressure of dry air, and humidity ratio
10:00 - Problem 2: Calculation of mass of dry air, specific humidity, and due point temperature
23:00 - Problem 3: Calculation of initial specific humidity, mass of dry air, mass of water vapor, initial volume, final temperature, final relative humidity, and final specific humidity

Key Takeaways

- Pyrometric processes involve the calculation of relative humidity, partial pressure of dry air, and the humidity ratio.
- Steam tables are essential for finding saturation pressure.
- A pyrometric chart can be used to retrieve other values once the state is fixed.
- The specific humidity and due point temperature can be calculated using the given temperature and pressure.
- The volume occupied by a gas mixture can be calculated using the ideal gas equation of state.
- The state of a system after heating can be determined by comparing the specific volume of water to the specific volume of the gas at a given pressure.