Transient behavior investigation of a regenerative dual-evaporator organic Rankine cycle with different forms of disturbances: towards coordinated feedback control realization

Yang Du, Tingting Liu, Yaxiong Wang, Kang Chen, Pan Zhao, Jiangfeng Wang, Yiping Dai*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This study utilizes an innovative regenerative dual-evaporator organic Rankine cycle (RDORC) with R1234ze to recover solid bulk waste heat by using air as heat transfer medium. A comprehensive transient model for RDORC is constructed based on finite volume method. Furthermore, a novel coordinated feedback control system for RDORC including two PI controllers is proposed to remain turbine inlet main vapor and resupplied vapor superheat degrees constant. The transient behaviors of RDORC and simple ORC (SORC) are compared under external disturbances of heat source inlet temperature. The results indicate that under 10°C step decrease disturbance, the RDORC presents a 0.5°C larger undershoot and a 164s longer setting time of superheat degree than that of SORC. Compared with SORC, the exergy efficiency enhancement of RDORC increases from initial value 4.13% to final value 4.51% after the step disturbance. Under sinusoidal disturbance with amplitude of 10°C in RDORC, the peak amplitude of turbine main vapor inlet pressure (3.6%) is far higher than that of turbine resupplied vapor inlet pressure (0.82%). Besides, under random disturbance with variance of 1, the system exergy efficiency and thermal efficiency fluctuate around the design values of 35.67% and 7.65% with maximum deviations of 2.2% and 0.37%, respectively.
Original languageEnglish
Article number121437
JournalEnergy
Volume235
Number of pages18
ISSN0360-5442
DOIs
Publication statusPublished - 2021

Keywords

  • Dual evaporator
  • Organic rankine cycle
  • Transient behavior
  • Coordinated control
  • Exergy efficiency

Fingerprint

Dive into the research topics of 'Transient behavior investigation of a regenerative dual-evaporator organic Rankine cycle with different forms of disturbances: towards coordinated feedback control realization'. Together they form a unique fingerprint.

Cite this