Regenerative Feed Water Heating — Lesson 2

This lesson covers the concept of regenerative feed water heating, a strategy used to increase the temperature of a stream without directly heating it. The lesson explains how this process involves mixing a high-temperature steam with a liquid to increase the liquid's temperature. The lesson also discusses the concept of exergy destruction and how regenerative feed water heating aims to reduce it. The lesson further explores the impact of this strategy on the efficiency of a cycle, using real numbers for illustration. It also introduces the concept of open and closed feed water heating and their operation pressures.

Video Highlights

01:10 - Explanation of how regenerative feed water heating works
03:04 - Detailed explanation of open feed water heating
08:36 - Calculation of extraction amount of steam
12:18 - Comparison of exergy destruction with and without regenerative feed water heating
14:33 - Shortcomings of regenerative feed water heating

Key Takeaways

- Regenerative feed water heating is a strategy used to increase the temperature of a stream without directly heating it.
- This method can lead to exergy destruction due to its irreversible nature.
- The two ways to accomplish feed water heating are mixing and closed feed water heating.
- Regenerative feed water heating can improve the efficiency of a cycle but may decrease the specific power output.
- Closed feed water heating operates with different pressures for the extracted steam and the feed water.