Hydraulic isothermal pressure reduction turbine: An efficient and low-cost electricity generation source

Julian David Hunt*, Andreas Nascimento, André Thomazoni, Paulo Smith Schneider, Wilmar Wounnsoscky, Nelson Ponce Junior, Marcos Aurélio Vasconcelos de Freitas, Jonas Rafael Gazoli, Fabio Tales Bindemann, Yoshihide Wada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


There is currently a large amount of energy being wasted on pressure reduction valves across the world. This paper argues that this energy could be harnessed with isothermal depressurization by applying a hydraulic isothermal pressure reduction turbine. The hydraulic isothermal pressure reduction turbine consists of two tanks filled with water or an organic liquid. The pressurized gas enters the tank, displacing the liquid, which flows through a turbine, generating electricity. The proposed system has efficiencies surrounding 90%, which is higher than usual pressure reduction turbines. The estimated cost for the proposed technology is 1300 USD/kW. The proposed technology could be feasible to harness the potential for electricity generation wasted in pressure reduction valves. The need for this technology will increase significantly in a future hydrogen-based economy, given the low volumetric density of hydrogen and the significant energy losses when compressing and decompressing hydrogen.

Original languageEnglish (US)
Article number101332
JournalResults in Engineering
StatePublished - Sep 2023

Bibliographical note

Funding Information:
This research was funded by the project entitled “Eficientização Energética de Usina Termelétrica a Gás Através do Aproveitamento Termodinâmico do Gás Natural” within the scope of R&D ANEEL program and financed by Âmbar Energia LDTA.

Publisher Copyright:
© 2023


  • Energy efficiency
  • Energy recovery
  • Hydrogen
  • Isothermal decompression
  • Pressure reduction turbine

ASJC Scopus subject areas

  • General Engineering


Dive into the research topics of 'Hydraulic isothermal pressure reduction turbine: An efficient and low-cost electricity generation source'. Together they form a unique fingerprint.

Cite this