Carnot Battery; Heat Pump; Organic Rankine Cycle; Thermal Energy Storage
Abstract :
[en] As renewable energy sources experience rapid growth and widespread adoption worldwide, the pressing challenge lies in efficiently storing and utilizing them. The Carnot battery emerges as a promising solution to this challenge. Existing Carnot batteries based on the Organic Rankine Cycle (ORC) mainly focus on district heating and power generation applications but neglect the unique operational conditions found on farms. This study investigates a family farm in Nigeria. Due to the intermittent nature of the national grid, the family relies on diesel generators as a backup power source, thus prompting consideration of renewable energy sources for environmental and energy-saving purposes. Therefore, an off-grid reversible heat pump (HP) /ORC with a photovoltaic (PV) array must be designed to meet the electricity and cooling needs of the farm. The configuration and working fluid of the reversible HP/ORC system are first selected, and then the pinch point and glides of heat exchangers, the top temperature of hot storage, and the built-in volume ratio of the scroll machine are determined. The results give the round-trip efficiency and operating mode details in various demand coverage throughout the year in addition to the COP of HP, and ORC efficiency at nominal conditions. The design with an electrical heater and ice-cooled ORC is proposed to improve system performance and its COP and ORC efficiency can reach 2.72 and 9.51%, respectively.
Research Center/Unit :
Thermodynamics Laboratory, University of Liege, 4000 Liege, Belgium
Disciplines :
Energy
Author, co-author :
Guo, Bentao ; Université de Liège - ULiège > Aérospatiale et Mécanique (A&M)
Lemort, Vincent ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Thermodynamique appliquée
Language :
English
Title :
Designing of an Off-Grid Reversible Heat Pump/Organic Rankine Cycle System for Electricity and Cooling Demands of a Nigerian Family Farm
Publication date :
05 July 2024
Event name :
37th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Event place :
Rhodes, Greece
Event date :
30/06/2024-05/07/2024
By request :
Yes
Audience :
International
Main work title :
37th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Publisher :
ECOS2024
Peer reviewed :
Peer reviewed
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 EU - European Union
Funding number :
R.8003.23
Funding text :
The authors would like to acknowledge the support of the project "REPTES - Renewable plants integrated with pumped thermal energy storage for sustainable satisfaction of energy and agricultural needs of African communities" under LEAP-RE programme, which has received funding from the European Union’s Horizon 2020 Research and Innovation Program under Grant Agreement 963530. This work was also supported by the Fonds de la Recherche Scientifique - FNRS under Grant(s) n° R.8003.23.
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