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Publication Title | INVESTIGATION OF A MASSIVE ELECTRICITY STORAGE SYSTEM BY MEANS OF A GEOTHERMAL HEAT TRANSFER PROCESS INVOLVING CO2 TRANSCRITICAL CYCLES

Organic Rankine Cycle

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INVESTIGATION OF A MASSIVE ELECTRICITY STORAGE SYSTEM BY MEANS OF A GEOTHERMAL HEAT TRANSFER PROCESS INVOLVING CO2 TRANSCRITICAL CYCLES

Fadhel Ayachi1, Thomas Tartière2, Nicolas Tauveron1*, Stéphane Colasson1, Denis Nguyen3 1CEA, LITEN – DTBH/SBRT/LS2T, 17 rue des Martyrs, 38054 Grenoble, France

fadhel.ayachi@cea.fr, nicolas.tauveron@cea.fr; stephane.colasson@cea.fr 2Enertime, 1 rue du Moulin des Bruyères, 92400 Courbevoie, France

thomas.tartiere@enertime.com

3BRGM Languedoc-Roussillon, 1039 rue de Pinville, 34000 Montpellier, France

d.nguyen@brgm.fr

* Corresponding Author

ABSTRACT

This work presents a specific application of the Rankine cycle and heat pump technologies: electricity storage. A multi-megawatt thermo-electric energy storage based on thermodynamic cycles is studied as a promising alternative to PSH (Pumped-Storage Hydroelectricity) and CAES (Compressed Air Energy Storage) systems. As a preliminary work, the main objective is to assess the performances of the massive storage technology based on transcritical CO2 heat pump for charging and transcritical CO2 Organic Rankine Cycle for discharging, with power output in the 1-10 MWe range.

The general concept of the system is presented, along with its thermodynamic modeling. A parametric analysis is carried out showing that it is possible to reach roundtrip efficiencies up to 53% that are competitive with other technologies. This work also shows the strong dependency between the different parameters of the system, and how an economic optimization will have to take all the subcomponents into account.

1. INTRODUCTION

Organic Rankine Cycles (ORC) have been used in a wide range of applications, including geothermal, biomass or solar power plants, waste heat recovery from industrial processes or combustion engines, ocean thermal energy conversion... and a wide range of power outputs from a few kW to tens of MW. The possibility to use ORC to produce electricity from heat that has been previously stored as a large- scale electricity storage technology remains more confidential but has been the subjects of recent studies [1].

As it is well-known, the massive integration of intermittent renewable energy production generates new challenges for the supervision and regulation of electric grids. The use of flexible but carbon- intensive technologies such as gas turbines has been the main solution in order to ensure the balance between demand and supply, maintaining grid frequency and power quality. However, large-scale electricity storage is a promising alternative with a much lower environmental impact. In addition, it would enable a decentralized access to electricity and lower the dependency on fossil fuels. If storage is still expensive today, it could become increasingly viable as the price of carbon rises.

Several technologies exist or are under development for large-scale energy storage. Pumped Hydro Storage (PHS) is the most common one, accounting for more than 99% of the worldwide bulk storage capacity, representing around 140 GW over 380 locations [2]. When there is an excess of power supply, water is pumped to an upper reservoir, from where it can be discharged to drive a turbine

Paper ID: 10, Page 1

3rd International Seminar on ORC Power Systems, October 12-14, 2015, Brussels, Belgium

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