@article{Emadi:2020:10.1016/j.apenergy.2019.114384,
author = {Emadi, MA and Chitgar, N and Oyewunmi, O and Markides, C},
doi = {10.1016/j.apenergy.2019.114384},
journal = {Applied Energy},
pages = {1--20},
title = {Working-fluid selection and thermoeconomic optimisation of a combined cycle cogeneration dual-loop organic Rankine cycle (ORC) system for solid-oxide fuel cell (SOFC) waste heat recovery},
url = {http://dx.doi.org/10.1016/j.apenergy.2019.114384},
volume = {261},
year = {2020}
}

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TY  - JOUR
AB  - A novel combined-cycle system is  proposed for the  cogeneration  ofelectricityand  cooling,  in  which a  dual-loop organic Rankine cycle (ORC)engine is used for waste-heat recovery from a solidoxide fuel cellsystem equipped witha gas turbine(SOFC-GT). Electricity is generated by the SOFC, its associated gas turbine, the two ORC turbines and a liquefied natural gas (LNG)turbine; the LNGsupply tothe fuel cell is also used as the heat  sink to  the  ORC  enginesandas a  cooling  medium  for  domestic  applications. The  performance  of  the system with 20 different combinationsof ORC working fluids isinvestigated by multi-objective optimisationof its capitalcostrateand exergy efficiency, using an integrationof a genetic algorithm and a neural network. The combination of R601(top cycle) and Ethane(bottom cycle)isproposed for the dual-loop ORC system, due to the satisfaction of the optimisationgoals, i.e., an optimal trade-off between efficiency and cost.With theseworking fluids, the overall system achieves an exergy efficiency of51.6%, a total electrical powergeneration of1040kW, with the ORC waste-heat recovery system supplying 20.7% of thispower,and a cooling capacityof 567kW. In addition, an economic analysisof theproposed SOFC-GT-ORCsystemshowsthat the cost of production of an electrical unit amounts to$33.2perMWh, which is 12.9%and 73.9%lowerthan the levelized cost  of  electricityofseparateSOFC-GT  and  SOFC systems,respectively. Exergy  flow  diagrams  are usedto determine the flow rate of the exergy andthe value of exergy destructionin each component. In the waste heat recovery  system,exergy  destruction  mainly  occurs  within  theheat  exchangers,  the  highestof  which isin  the LNG cooling  unit  followedby  the  LNG  vaporiser  and  the  evaporator  ofthe  bottom-cycleORCsystem, highlightingthe importance of these components’designin maximising the performance of the overall system.
AU  - Emadi,MA
AU  - Chitgar,N
AU  - Oyewunmi,O
AU  - Markides,C
DO  - 10.1016/j.apenergy.2019.114384
EP  - 20
PY  - 2020///
SN  - 0306-2619
SP  - 1
TI  - Working-fluid selection and thermoeconomic optimisation of a combined cycle cogeneration dual-loop organic Rankine cycle (ORC) system for solid-oxide fuel cell (SOFC) waste heat recovery
T2  - Applied Energy
UR  - http://dx.doi.org/10.1016/j.apenergy.2019.114384
UR  - https://www.sciencedirect.com/science/article/pii/S0306261919320719?via%3Dihub
UR  - http://hdl.handle.net/10044/1/75677
VL  - 261
ER  - 

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