A co-axial multi-T ube heat exchanger applicable for a geothermal ORC power plant

J. C. Hsieh, Y. R. Lee, T. R. Guo, L. W. Liu, Pi-Ying Cheng, Chi-Chuan Wang*

*Corresponding author for this work

Research output: Contribution to journalConference article

4 Scopus citations

Abstract

The study proposes a Co-axial multi-T ube heat exchanger (CMTHE) applicable to geothermal heat extraction. The heat exchanger is integrated with a 50 kW geothermal ORC power plant having a working fluid of R-245fa. Two field tests were performed to examine the system response of the ORC system subject to change of CMTHE. In case 1 where the flow rate in the shell-side of CMTHE is maintained, the pressure variation in the shell-side of CMTHE casts minor variations on heat extraction, ORC power generation, and ORC efficiency during the transient. Moreover, the effect of pressure has barely any influence of the final states of heat extraction, ORC power generation, and ORC efficiency. In case 2 where the pressure is preserved in the CMTHE, it is found that a decrease of flow rate in the CMTHE results in degradation of heat extraction, ORC power generation and ORC system efficiency. On the contrary, increasing the flow rate in the CMTHE leads to a rise of heat extraction, ORC power generation and ORC system efficiency. Unlike that in case 1, the effect of flow rate has a detectable effect on the final states of heat extraction, ORC power generation, and ORC efficiency.

Original languageEnglish
Pages (from-to)874-877
Number of pages4
JournalEnergy Procedia
Volume61
DOIs
StatePublished - 1 Jan 2014
Event6th International Conference on Applied Energy, ICAE 2014 - Taipei, Taiwan
Duration: 30 May 20142 Jun 2014

Keywords

  • Co-axial heat exchanger
  • Geothermal
  • Heat transfer
  • Organic rankine cycle
  • Renewable energy

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