Technical assessment of Brayton cycle heat pumps for the integration in hybrid PV-CSP power plants

Mahdi, Zahra; Dersch, Jürgen; Schmitz, Pascal; Dieckmann, Simon; Caminos, Ricardo Alexander Chico; Boura, Christiano; Herrmann, Ulf; Schwager, Christian; Schmitz, Mark; Gielen, Hans; Gedle, Yibekal; Büscher, Rauno

doi:10.1063/5.0086269

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…There are several possible configurations for a CSP-PV system with a heat pump. Madhi et al [9] investigated three different concepts combining parabolic trough collectors with oil as heat transfer fluid, a PV field, molten salt thermal storage, and a heat pump. In the first configuration, the molten salt was preheated by the CSP field and further heated by the HP using ambient air as the heat source.…”

Section: Hybrid Csp-pv Power Plant With Heat Pumpmentioning

confidence: 99%

“…The CSP field provides the heat source for the heat pump. The medium of the heat pump is air, as the results are similar to N2 (best fluid in [9]) and it is easier to obtain. The PV field supplies the heat pump with electricity.…”

Section: Hybrid Csp-pv Power Plant With Heat Pumpmentioning

confidence: 99%

“…Numerous studies have analyzed hybrid plants [1][2][3][4][5][6][7][8][9][10] and some plants have already been constructed [11][12][13]. Different levels of hybridization are possible [1].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, payback periods of around 5-10 years could be achieved. Mahdi et al [9] analyzed the use of high-temperature heat pumps to boost the salt temperature in the thermal energy storage of a parabolic trough collector system from 385 °C up to 565 °C. Different heat transfer fluids (HTF) for the heat pump were simulated and compared.…”

Section: Introductionmentioning

confidence: 99%

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Techno-Economic Evaluation of CSP–PV Hybrid Plants with Heat Pump in a Temperature Booster Configuration

Iñigo-Labairu,

Dersch,

Hirsch

et al. 2024

Energies

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Concentrated solar power (CSP)—photovoltaic (PV) hybrid power plants allow for the generation of cheap electrical energy with a high capacity factor (CF). A deep integration of both technologies offers synergies, using parts of the PV generated electricity for heating the thermal storage tank of the CSP unit. Such configurations have been previously studied for systems coupled by an electric resistance heater (ERH). In this work, the coupling of a CSP and a PV plant using a heat pump (HP) was analyzed due to the higher efficiency of heat pumps. The heat pump is used as a booster to lift the salt temperature in the storage system from 383 to 565 °C in order to reach higher turbine efficiency. A techno-economic analysis of the system was performed using the levelized cost of electricity (LCOE), the capacity factor and nighttime electricity fraction as variables for the representation. The CSP–PV hybrid with a booster heat pump was compared with other technologies such as a CSP–PV hybrid plant coupled by an electric heater, a standalone parabolic trough plant (PT), a photovoltaic system with battery storage (PV–BESS), and a PV thermal power plant (PVTP) consisting of a PV plant with an electric heater, thermal energy storage (TES) and a power block (PB).

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Section: Hybrid Csp-pv Power Plant With Heat Pumpmentioning

confidence: 99%

Section: Hybrid Csp-pv Power Plant With Heat Pumpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Techno-Economic Evaluation of CSP–PV Hybrid Plants with Heat Pump in a Temperature Booster Configuration

Iñigo-Labairu,

Dersch,

Hirsch

et al. 2024

Energies

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show abstract

“…Footprint estimation of selected configurations was included in the analysis. Mahdi et al [28] proposed a reverse Brayton heat pump integrated with a steam Rankine power plant, using molten salts as a thermal energy storage system. Different gases were analysed as working fluid for the heat pump, whereas environment and PTC were combined to supply low thermal energy to the heat pump, which is driven by PV.…”

Section: Introductionmentioning

confidence: 99%

Carnot Battery Based on Brayton Supercritical CO2 Thermal Machines Using Concentrated Solar Thermal Energy as a Low-Temperature Source

et al. 2023

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Carnot batteries store surplus power as heat. They consist of a heat pump, which upgrades a low-temperature thermal energy storage, a high-temperature storage system for the upgraded thermal energy, and a heat engine that converts the stored high-temperature thermal energy into power. A Carnot battery is proposed based on supercritical CO2 Brayton thermodynamic cycles. The low-temperature storage is a two-tank molten salt system at 380 °C/290 °C fed by a field of parabolic trough collectors. The high-temperature storage consists of another two-tank molten salt system at 589 °C/405 °C. Printed circuit heat exchangers would be required to withstand the high pressure of the cycles, but shell and tube heat exchangers are proposed instead to avoid clogging issues with molten salts. The conventional allocation of high-temperature molten salt heat exchangers is then modified. Using solar energy to enhance the low-temperature thermal source allowed a round-trip efficiency of 1.15 (COP of 2.46 and heat engine efficiency of 46.5%), thus increasing the stored power. The basic configuration has a levelised cost of storage of USD 376/MWh while replacing the shell and tube heat exchangers with hybrid printed circuit heat exchangers is expected to lower the cost to USD 188/MWh.

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Electrification of Heating—Requirements for Successful Wide‐Scale Deployment

Hewitt

2024

WIREs Energy & Environment

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Electrification is potentially the most efficient method of decarbonization of space, water, and in certain instances, process heating through the deployment of electrically driven heat pumps. However, challenges are noted in terms of electricity network capacity that ultimately must influence a holistic approach to building/process heating demand reductions which in turn must influence heat pump development, heat pump operations, heat pump capital cost, and the role of thermal storage. Approaches to these challenges are presented from a global and, a UK and Ireland perspective, as for the UK and Ireland, it is often muted that the electricity network is less well suited to addressing the electrification of heating. Thus, this work will consider the likely cost‐effective heat demand reductions in buildings and processes, how might heat pumps operate in future electricity markets and systems, how can we make heat pumps cheaper to purchase and cheaper to operate and what is the role and type of energy storage in terms of demand side management. Thermal energy storage will be considered for space heating (30°C–80°C), water heating (60°C+ to negate legionella), and lower temperature industrial process (up to e.g., 300°C). Furthermore, an analysis of a UK housing development is presented as a retrofit case study for social housing, illustrating the impacts of the electricity network, and approaches that can be taken, for example, thermal storage, to minimize such impacts. Higher temperature systems will be considered for process applications.

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Technical assessment of Brayton cycle heat pumps for the integration in hybrid PV-CSP power plants

Cited by 3 publications

References 8 publications

Techno-Economic Evaluation of CSP–PV Hybrid Plants with Heat Pump in a Temperature Booster Configuration

Techno-Economic Evaluation of CSP–PV Hybrid Plants with Heat Pump in a Temperature Booster Configuration

Carnot Battery Based on Brayton Supercritical CO2 Thermal Machines Using Concentrated Solar Thermal Energy as a Low-Temperature Source

Electrification of Heating—Requirements for Successful Wide‐Scale Deployment

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