Modelling of Plate Heat Exchangers and Their Associated CO2 Trancritical Power Generation System

Y. T. Ge*, L. Li, X. Luo, S. A. Tassou

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

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Abstract

Globally, there is no shortage of low-grade waste and renewable heat sources that can be converted into electricity and useful heat using applicable thermodynamic power cycles and appropriate working fluids. As a natural working fluid, CO2 is a promising candidate for application in low-grade power generation systems but require optimised design and evaluation. Since CO2 working fluid has a low critical temperature (31.1°C) and high critical pressure (73.8 bar), a CO2 low-grade power generation system will most likely undergo supercritical Rankine (T-CO2) cycles. A T-CO2 system normally consists of a CO2 supercritical gas heater, expander, recuperator, condenser and liquid pump with the CO2 gas heater being a crucial component in determining system thermal and exergy efficiencies. In this paper, the models of a thermal oil-CO2 plate gas heater has been developed and validated with measurements of a 5 kWe T-CO2 system test rig. The model is then integrated with other system component models to establish the system model. The system model can be used to evaluate and compare system performances at different operating conditions, including variable CO2 gas heater pressures and heat sink parameters, thereby optimising system operations.

Original languageEnglish
Pages (from-to)1821-1826
Number of pages6
JournalEnergy procedia
Volume105
DOIs
Publication statusPublished - 1 Jan 2017
Externally publishedYes
Event8th International Conference on Applied Energy, ICAE 2016 - Beijing, China
Duration: 8 Oct 201611 Oct 2016
Conference number: 8th

Keywords

  • CO gas heater model and validation
  • CO Transcritical Rankine Cycles
  • Low-grade power generation
  • Simulation

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