Technical Feasibility Assessment of a Recuperator in Reversible Trans-critical CO2 Heat Pump/Rankine Cycle: Considering Scroll Machine Operation Boundaries - 2025
Paper published in a book (Scientific congresses and symposiums)
Technical Feasibility Assessment of a Recuperator in Reversible Trans-critical CO2 Heat Pump/Rankine Cycle: Considering Scroll Machine Operation Boundaries
Guo, Bentao; Cendoya, Aitor; Lemort, Vincent
2025 • In 38th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Carnot Batteries; ORC and Supercritical CO2 systems; Refrigeration and heat pumps; Internal heat exchanger; Operation boundary
Abstract :
[en] Carnot batteries are getting more attention rapidly, as a potential energy storage technology coupled with variable renewable energy. Trans-critical heat pumps (THP)/Rankine cycles (TRC) using a natural fluid CO2 perform well with a sensible hot storage of a large temperature spread, and their capital cost can be further reduced in a reversible configuration. This study proposes a reversible THP/TRC based on a reversible scroll machine with hot storage but without cold storage for a small-scale family farm, using the ambient air as the secondary fluid of the evaporator/condenser in THP/TRC, respectively. The study assesses the feasibility of a recuperator in the reversible THP/TRC under optimal and limited operation ranges, taking into account the maximum pressure and temperature of the scroll machine. In optimal operation, the recuperator improves the power-to-power efficiency (P2P) up to 28 % (recuperator efficiency is 0.75) and reduces the optimal high pressure of both THP/TRC. In the limited operation, P2P is improved by a perfect recuperator up to 57 %, and this value decreases with recuperator efficiency from 1 to 0.25. The extension of the highest scroll pressure contributes to a higher possible hot storage temperature and less affected conditions for basic THP/TRC without a recuperator. The affected conditions in the recuperated THP/TRC are reduced by the higher temperature that the scroll machine can withstand. This work introduces operation boundaries of a reversible scroll machine as constraints in a reversible CO2 Carnot battery, supplying some reference for its practical system design and operation conditions.
Research Center/Unit :
A&M - Aérospatiale et Mécanique - ULiège
Disciplines :
Energy
Author, co-author :
Guo, Bentao ; Université de Liège - ULiège > Aérospatiale et Mécanique (A&M)
Lemort, Vincent ; Université de Liège - ULiège > 航空航天与机械系 > 热力学应用
Language :
English
Title :
Technical Feasibility Assessment of a Recuperator in Reversible Trans-critical CO2 Heat Pump/Rankine Cycle: Considering Scroll Machine Operation Boundaries
Publication date :
02 July 2025
Event name :
38th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Event place :
Paris, France
Event date :
29/06/2025-04/07/2025
Audience :
International
Main work title :
38th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Publisher :
ECOS 2025, Paris, France
Peer review/Selection committee :
Peer reviewed
Development Goals :
7. Affordable and clean energy
European Projects :
H2020 - 963530 - LEAP-RE - Long-Term Joint EU-AU Research and Innovation Partnership on Renewable Energy
Name of the research project :
REPTES - Renewable plants integrated with pumped thermal energy storage for sustainable satisfaction of energy and agricultural needs of African communities
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique European Union
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