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Advances in Organic Rankine Cycle System and Thermal Storage System

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J: Thermal Management".

Deadline for manuscript submissions: closed (27 February 2024) | Viewed by 1835

Special Issue Editors


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Guest Editor
Department of Natural Resources Management & Agricultural Engineering, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece
Interests: low-temperature heat-to-power conversion with ORC; solar sub-critical ORC prototypes (power generation and desalination) design, manufacturing and testing; volumetric expanders and heat exchangers design, manufacturing and testing; super-critical, TransCritical prototypes design manufacturing and testing; trilateral flash cycle
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Mechanical Engineering, University of West Attica, 12244 Athens, Greece
Interests: applied thermodynamics; power generation cycles; heat-to-power conversion; supercritical CO2; heat transfer; cycles innovation; fluid mechanics; heat exchangers design
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nowadays, there is a growing need to recover wasted heat and improve the efficiency of power generation systems, given the extent to which since environmental and financial limits and crises impose energy consumption reduction on a global level. organic Rankine cycle is considered to be the most promising thermodynamic cycle for low-temperature rejected heat and its conversion into power, a process of much of research interest. Moreover, the thermal storage systems can accelerate the largescale employment of heat-to-power conversion engines, leading to larger operation times, the development of polygeneration systems and finally increased energy savings and reduced CO2 footprint. 

The main scope of this Special Issue is to present the current state-of-the art in organic Rankine cycles and thermal energy systems. This includes CO2 power cycles and other innovative power generation cycles, which may lead to next-generation power production systems. This Special Issue will contribute a comprehensive forum for research ideas, including both simulations and experimental studies on a wide range of topics, such as the following:

  • Organic Rankine cycles modelling concepts and control
  • Power conversion cycles
  • Supercritical CO2 power cycle
  • Trilateral flash cycle
  • Thermal energy storage systems
  • Innovative methods/materials for energy storage
  • Components design and modelling
  • Combined heat and power generation applications

Dr. Dimitris S. Manolakos
Dr. Apostolos Gkountas
Guest Editors

Manuscript Submission Information

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Keywords

  • ORC engine
  • waste heat recovery power conversion
  • energy storage
  • phase change
  • techno-economic analysis
  • combined cycles
  • cogeneration

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Published Papers (1 paper)

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Research

20 pages, 7767 KiB  
Article
Development of 180 kW Organic Rankine Cycle (ORC) with a High-Efficiency Two-Stage Axial Turbine
by Jung-Bo Sim, Se-Jin Yook and Young Won Kim
Energies 2023, 16(20), 7112; https://doi.org/10.3390/en16207112 - 16 Oct 2023
Cited by 1 | Viewed by 1471
Abstract
The design of turbines used to convert thermal energy into electrical energy in an organic Rankine cycle (ORC) is crucial. A high-speed turbine requires high-performance bearings, which increases turbine manufacturing costs. In this study, a high-efficiency two-stage axial turbine at a low rotational [...] Read more.
The design of turbines used to convert thermal energy into electrical energy in an organic Rankine cycle (ORC) is crucial. A high-speed turbine requires high-performance bearings, which increases turbine manufacturing costs. In this study, a high-efficiency two-stage axial turbine at a low rotational speed was developed, and the ORC performance was presented. We designed a 180-kW axial turbine of 12,000 rpm. To increase turbine efficiency, the number of turbine stages was set to two, and turbine blades were designed to reduce pressure losses. One-dimensional design parameters of blades that minimized the total pressure loss were selected using an in-house code based on a generalized reduced gradient (GRG) nonlinear algorithm. Three-dimensional turbine blade modeling and numerical analysis were performed using commercial software. The total-to-static isentropic efficiency and output of the two-stage axial turbine were predicted to be 85.1% and 176 kW, respectively. ORC performance was assessed using the predicted turbine performance results. Assuming the temperature of the condenser outlet working fluid to be 25 °C, the ORC thermal efficiency and exergy efficiency were found to be 7.40% and 34.49%, respectively. Our findings highlight the applicability of various rotational speeds and number of stages for an axial turbine in an ORC. Full article
(This article belongs to the Special Issue Advances in Organic Rankine Cycle System and Thermal Storage System)
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