Ch 9. Brayton Cycle Multimedia Engineering Thermodynamics BraytonCycle Intercoolingand Reheating
 Chapter 1. Basics 2. Pure Substances 3. First Law 4. Energy Analysis 5. Second Law 6. Entropy 7. Exergy Analysis 8. Gas Power Cyc 9. Brayton Cycle 10. Rankine Cycle Appendix Basic Math Units Thermo Tables Search eBooks Dynamics Fluids Math Mechanics Statics Thermodynamics Author(s): Meirong Huang Kurt Gramoll ©Kurt Gramoll

 THERMODYNAMICS - CASE STUDY Introduction Andrew's company bought an old power plant which is running a simple Brayton cycle without regeneration for years. Modifications are needed to increase the power generation and thermal efficiency. Several suggestions are given. Andrew is given the task to compare all the plans. What is known: The conditions for the simple Brayton cycle: Compression ratio: 8 Compressor inlet pressure: 100 kPa Minimum temperature: 300 K Maximum temperature: 1300 K Plan 1: Use regeneration. The effectiveness of the regenerator is 0.8 Plan 2: Two-stage intercooling, reheating, and regeneration with the same temperature limit and compression ratio. Question Determine which plan has the highest power output, which one has the highest thermal efficiency under the same temperature limits and compression ratio. Approach Determine temperature and pressure in each state of the cycle. The thermal efficiency can be determined by its general definition: ηth = 1 - qout /qin