Christos N. Markides

article

Optimization-based investigations of a two-phase thermofluidic oscillator for low-grade heat conversion

Yukun Wang, Christos N. Markides, Benoît Chachuat

BMC Chemical Engineering > 2019 > 1 > 1 > 1-20

Background The non-inertive-feedback thermofluidic engine (NIFTE) is a two-phase thermofluidic oscillator capable of utilizing heat supplied at a steady temperature to induce persistent thermal-fluid oscillations. The NIFTE is appealing in its simplicity and ability to operate across small temperature differences, reported as low as 30 ^∘C in early prototypes. But it is also expected that the NIFTE...

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On the link between experimentally‐measured turbulence quantities and polymer‐induced drag reduction in pipe flows

Victor Voulgaropoulos, Ivan Zadrazil, Niccolò Le Brun, Alexander Bismarck, more

AIChE Journal > 65 > 9 > n/a - n/a

In this study, we investigate the hydrodynamics of polymer‐induced drag reduction (DR) in horizontal turbulent pipe flows. We provide spatiotemporally resolved information of velocity and its gradients obtained with particle image velocimetry measurements in solutions of water with dissolved polyethylene oxide of three different molecular weights (MWs), at various dilute concentrations and with flow...

article

Correction to: A Galinstan-Filled Capillary Probe for Thermal Conductivity Measurements and Its Application to Molten Eutectic KNO₃–NaNO₃–NaNO₂ (HTS) up to 700 K

Niccolò Brun, Christos N. Markides

International Journal of Thermophysics > 2019 > 40 > 7 > 1-1

The original version of the article unfortunately contained an error in article title. The last compound in the chemical formula should be “NaNO₂” instead of “NO₂”. The corrected article title is given below.

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A thermo-economic analysis and comparison of pumped-thermal and liquid-air electricity storage systems

Solomos Georgiou, Nilay Shah, Christos N. Markides

Applied Energy > 2018 > 226 > C > 1119-1133

Efficient and affordable electricity storage systems have a significant potential to support the growth and increasing penetration of intermittent renewable-energy generation into the grid from an energy system planning and management perspective, while differences in the demand and price of peak and off-peak electricity can make its storage of economic interest. Technical (e.g., roundtrip efficiency,...

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Thermodynamic optimisation of a high-electrical efficiency integrated internal combustion engine – Organic Rankine cycle combined heat and power system

Maria Anna Chatzopoulou, Christos N. Markides

Applied Energy > 2018 > 226 > C > 1229-1251

Organic Rankine cycle (ORC) engines are suitable for heat recovery from internal combustion engines (ICE) for the purpose of secondary power generation in combined heat and power (CHP) systems. However, trade-offs must be considered between ICE and ORC engine performance in such integrated solutions. The ICE design and operational characteristics influence its own performance, along with the exhaust-gas...

article

Optimal design and operation of distributed low-carbon energy technologies in commercial buildings

Salvador Acha, Arthur Mariaud, Nilay Shah, Christos N. Markides

Energy > 2018 > 142 > C > 578-591

Commercial buildings are large energy consumers and opportunities exist to improve the way they produce and consume electricity, heating and cooling. If energy system integration is feasible, this can lead to significant reductions in energy consumption and emissions. In this context, this work expands on an existing integrated Technology Selection and Operation (TSO) optimisation model for distributed...

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ORC cogeneration systems in waste-heat recovery applications

Oyeniyi A. Oyewunmi, Antonio M. Pantaleo, Christos N. Markides

Energy Procedia > 2017 > 142 > C > 1736-1742

The performance of organic Rankine cycle (ORC) systems operating in combined heat and power (CHP) mode is investigated. The ORC-CHP systems recover heat from selected industrial waste-heat fluid streams with temperatures in the range 150 °C – 330 °C. An electrical power output is provided by the expanding working fluid in the ORC turbine, while a thermal output is provided by the cooling water exiting...

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Modelling and optimising the marginal expansion of an existing district heating network

Axelle Delangle, Romain S.C. Lambert, Nilay Shah, Salvador Acha, more

Energy > 2017 > 140 > P1 > 209-223

Although district heating networks have a key role to play in tackling greenhouse gas emissions associated with urban energy systems, little work has been carried out on district heating networks expansion in the literature. The present article develops a methodology to find the best district heating network expansion strategy under a set of given constraints. Using a mixed-integer linear programming...

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Novel hybrid CSP-biomass CHP for flexible generation: Thermo-economic analysis and profitability assessment

Antonio M. Pantaleo, Sergio M. Camporeale, Adio Miliozzi, Valeria Russo, more

Applied Energy > 2017 > 204 > C > 994-1006

This paper focuses on the thermo-economic analysis of a 2.1-MWe and 960kWt hybrid solar-biomass combined heat and power (CHP) system composed of a 1.4-MWe Externally Fired Gas-Turbine (EFGT) and a 0.7-MWe bottoming Organic Rankine Cycle (ORC) power plant. The primary thermal energy input is provided by a hybrid Concentrating Solar Power (CSP) collector array covering a total ground area of 22,000–32,000m...

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Hybrid photovoltaic-thermal solar systems for combined heating, cooling and power provision in the urban environment

Alba Ramos, Maria Anna Chatzopoulou, Ilaria Guarracino, James Freeman, more

Energy Conversion and Management > 2017 > 150 > C > 838-850

Solar energy can play a leading role in reducing the current reliance on fossil fuels and in increasing renewable energy integration in the built environment, and its affordable deployment is widely recognised as an important global engineering grand challenge. Of particular interest are solar energy systems based on hybrid photovoltaic-thermal (PV-T) collectors, which can reach overall efficiencies...

article

Industrial waste-heat recovery through integrated computer-aided working-fluid and ORC system optimisation using SAFT-γ Mie

Martin T. White, Oyeniyi A. Oyewunmi, Andrew J. Haslam, Christos N. Markides

Energy Conversion and Management > 2017 > 150 > C > 851-869

A mixed-integer non-linear programming optimisation framework is formulated and developed that combines a molecular-based, group-contribution equation of state, SAFT-γ Mie, with a thermodynamic description of an organic Rankine cycle (ORC) power system. In this framework, a set of working fluids is described by its constituent functional groups (e.g., since we are focussing here on hydrocarbons: CH...

article

Performance of working-fluid mixtures in ORC-CHP systems for different heat-demand segments and heat-recovery temperature levels

Oyeniyi A. Oyewunmi, Christoph J.W. Kirmse, Antonio M. Pantaleo, Christos N. Markides

Energy Conversion and Management > 2017 > 148 > C > 1508-1524

In this paper, we investigate the adoption of working-fluid mixtures in ORC systems operating in combined heat and power (CHP) mode, with a power output provided by the expanding working fluid in the ORC turbine and a thermal energy output provided by the cooling water exiting (as a hot-water supply) the ORC condenser. We present a methodology for selecting optimal working-fluids in ORC systems with...

article

Thermoeconomic analysis of recuperative sub- and transcritical organic Rankine cycle systems

Oyeniyi A. Oyewunmi, Steven Lecompte, Michel De Paepe, Christos N. Markides

Energy Procedia > 2017 > 129 > C > 58-65

There is significant interest in the deployment of organic Rankine cycle (ORC) technology for waste-heat recovery and power generation in industrial settings. This study considers ORC systems optimized for maximum power generation using a case study of an exhaust flue-gas stream at a temperature of 380 °C as the heat source, covering over 35 working fluids and also considering the option of featuring...

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Experimental Investigation of the Operating Point of a 1-kW ORC System

Chinedu K. Unamba, Martin White, Paul Sapin, James Freeman, more

Energy Procedia > 2017 > 129 > C > 875-882

The organic Rankine cycle (ORC) is a promising technology for the conversion of waste heat from industrial processes as well as heat from renewable sources. Many efforts have been channeled towards maximizing the thermodynamic potential of ORC systems through the selection of working fluids and the optimal choice of operating parameters with the aim of improving overall system designs, and the selection...

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Solar/biomass hybrid cycles with thermal storage and bottoming ORC: System integration and economic analysis

Antonio M Pantaleo, Sergio M Camporeale, Arianna Sorrentino, Adio Miliozzi, more

Energy Procedia > 2017 > 129 > C > 724-731

This paper focuses on the thermodynamic modelling and thermo-economic assessment of a novel arrangement of a combined cycle composed of an externally fired gas turbine (EFGT) and a bottoming organic Rankine cycle (ORC). The main novelty is that the heat of the exhaust gas exiting from the gas turbine is recovered in a thermal energy storage from which heat is extracted to feed a bottoming ORC. The...

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Assessing, Benchmarking and Analyzing Heating and Cooling Requirements for Glasshouse Food Production: A Design and Operation Modelling Framework

Solomos Georgiou, Salvador Acha, Nilay Shah, Christos N. Markides

Energy Procedia > 2017 > 123 > C > 164-172

Growing populations, increase in food demand, society’s expectations for out of season products and the dependency of the food system on fossil fuels stress resources due to the requirements for national production and from importation of products from remote origins. Quantifying the use of resources in food production and their environmental impacts is key to identifying distinctive measures which...

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A review of solid–fluid selection options for optical-based measurements in single-phase liquid, two-phase liquid–liquid and multiphase solid–liquid flows

Stuart F. Wright, Ivan Zadrazil, Christos N. Markides

Experiments in Fluids > 2017 > 58 > 9 > 1-39

Experimental techniques based on optical measurement principles have experienced significant growth in recent decades. They are able to provide detailed information with high-spatiotemporal resolution on important scalar (e.g., temperature, concentration, and phase) and vector (e.g., velocity) fields in single-phase or multiphase flows, as well as interfacial characteristics in the latter, which has...

article

Integrated optimisation of photovoltaic and battery storage systems for UK commercial buildings

Arthur Mariaud, Salvador Acha, Ned Ekins-Daukes, Nilay Shah, more

Applied Energy > 2017 > 199 > C > 466-478

Decarbonising the built environment cost-effectively is a complex challenge public and private organisations are facing in their effort to tackle climate change. In this context, this work presents an integrated Technology Selection and Operation (TSO) optimisation model for distributed energy systems in commercial buildings. The purpose of the model is to simultaneously optimise the selection, capacity...

article

Energy Performance and Thermo-economic Assessment of a Microturbine-based Dual-fuel Gas-biomass Trigeneration System

Antonio M. Pantaleo, Sergio M. Camporeale, Christos N. Markides, Giacomo Scarascia Mugnozza, more

Energy Procedia > 2017 > 105 > C > 764-772

The focus of this paper is on the energy performance and thermo-economic assessment of a small scale (100 kWe) combined cooling, heat and power (CCHP) plant serving a tertiary/residential energy demand fired by natural gas and solid biomass. The plant is based on a modified regenerative micro gas-turbine (MGT), where compressed air exiting the recuperator is externally heated by the hot gases produced...

article

Thermo-economic Assessment of an Externally Fired Hybrid CSP/biomass Gas Turbine and Organic Rankine Combined Cycle

Antonio M. Pantaleo, Sergio M. Camporeale, Adio Miliozzi, Valeria Russo, more

Energy Procedia > 2017 > 105 > C > 174-181

This paper focuses on the thermo-economic analysis of a hybrid solar-biomass CHP combined cycle composed by a 1.3-MW externally fired gas-turbine (EFGT) and a bottoming organic Rankine cycle (ORC) plant. The primary thermal energy input is provided by a hybrid concentrating solar power (CSP) collector-array coupled to a biomass boiler. The CSP collector-array is based on parabolic-trough concentrators...

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Search results for: Christos N. Markides

Optimization-based investigations of a two-phase thermofluidic oscillator for low-grade heat conversion

On the link between experimentally‐measured turbulence quantities and polymer‐induced drag reduction in pipe flows

Correction to: A Galinstan-Filled Capillary Probe for Thermal Conductivity Measurements and Its Application to Molten Eutectic KNO₃–NaNO₃–NaNO₂ (HTS) up to 700 K

A thermo-economic analysis and comparison of pumped-thermal and liquid-air electricity storage systems

Thermodynamic optimisation of a high-electrical efficiency integrated internal combustion engine – Organic Rankine cycle combined heat and power system

Optimal design and operation of distributed low-carbon energy technologies in commercial buildings

ORC cogeneration systems in waste-heat recovery applications

Modelling and optimising the marginal expansion of an existing district heating network

Novel hybrid CSP-biomass CHP for flexible generation: Thermo-economic analysis and profitability assessment

Hybrid photovoltaic-thermal solar systems for combined heating, cooling and power provision in the urban environment

Industrial waste-heat recovery through integrated computer-aided working-fluid and ORC system optimisation using SAFT-γ Mie

Performance of working-fluid mixtures in ORC-CHP systems for different heat-demand segments and heat-recovery temperature levels

Thermoeconomic analysis of recuperative sub- and transcritical organic Rankine cycle systems

Experimental Investigation of the Operating Point of a 1-kW ORC System

Solar/biomass hybrid cycles with thermal storage and bottoming ORC: System integration and economic analysis

Assessing, Benchmarking and Analyzing Heating and Cooling Requirements for Glasshouse Food Production: A Design and Operation Modelling Framework

A review of solid–fluid selection options for optical-based measurements in single-phase liquid, two-phase liquid–liquid and multiphase solid–liquid flows

Integrated optimisation of photovoltaic and battery storage systems for UK commercial buildings

Energy Performance and Thermo-economic Assessment of a Microturbine-based Dual-fuel Gas-biomass Trigeneration System

Thermo-economic Assessment of an Externally Fired Hybrid CSP/biomass Gas Turbine and Organic Rankine Combined Cycle

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