A novel Pumped Thermal Electricity Storage (PTES) system with thermal integration

Frate, Guido Francesco; Antonelli, Marco; Desideri, Umberto

doi:10.1016/j.applthermaleng.2017.04.127

Cited by 126 publications

(74 citation statements)

References 25 publications

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“…A cold storage unit is the essential component for the PTES system [7,45] and can also be applied to improve the round trip efficiency of the LAES system [8,46]. Both McTigue et al [7] and Sciacovelli et al [8] used a packed bed as the cold storage unit for the PTES and LAES systems, respectively.…”

Section: Energy Storage Capacity Of Mepcmssmentioning

confidence: 99%

Thermo-mechanical analysis of microcapsules containing phase change materials for cold storage

Tchuenbou-Magaia

Al‐Duri

et al. 2018

Applied Energy

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Microencapsulated phase change material slurries (MEPCMSs) offer a potentially efficient and flexible solution for cryogenic-temperature cold storage. In this paper, the phase change material (PCM) microcapsules prepared to form MEPCMSs for cryogenictemperature cold storage consist of Dowtherm J (DJ) as core material and melamine formaldehyde (MF) as primary shell material. DJ is an aromatic mixture with diethylbenzene as the main component. Composite shell materials are adopted to avoid cracking by adding aluminium oxide (Al 2 O 3) nanoparticles or copper (Cu) coating into/on MF shell. In order to explore the heat transfer behaviour and mechanical stability of the microcapsules during the solidification process of PCM, a thermo-mechanical model is established by taking into account of energy conservation, pressure-dependent solid-liquid equilibria, Lamé's equations and buckling theory. Based on the proposed model, the effects of shell thickness, shell compositions and microcapsule size are therefore studied on the variations of pressure difference, freezing point, and latent heat. The cause of shell deformation is clearly explained and the shell buckling modes are predicted using the model, which agree well with the experimental observations. The critical core/shell size ratios of avoiding buckling are proposed for the microcapsules with different compositions. Simultaneously incorporation of Al 2 O 3 nanoparticles and Cu coating into/on MF shell can markedly enhance the resistant to buckling. In addition, special attention is paid to cold energy storage capacity of MEPCMSs, which has considerable superiority compared to packed pebble beds.

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Section: Energy Storage Capacity Of Mepcmssmentioning

confidence: 99%

Thermo-mechanical analysis of microcapsules containing phase change materials for cold storage

Tchuenbou-Magaia

Al‐Duri

et al. 2018

Applied Energy

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“…Carnot batteries (CBs) is the term that is used to define several different technologies to store electrical energy as thermal energy, which is then used again to generate power. Among the main CB technologies, the following were defined: pumped thermal electricity storage (PTES) (Frate et al, 2017a), also known as compressed heat energy storage (Steinmann, 2014), and liquid air energy storage (LAES) (Morgan et al, 2015). In CBs, the charge phase may be performed by converting electric energy into heat either with different heat pump technologies or with electric heaters.…”

Section: Introductionmentioning

confidence: 99%

“…Brayton systems that operate up to 1,000 • C have been proposed (Desrues et al, 2010), but more realistic estimates set the maximum operating temperature at around 500 • C (Howes, 2012;McTigue et al, 2015). On the other hand, Rankine PTES is most often designed to operate under 200 • C (Morandin et al, 2012a,b;Frate et al, 2017a), thus reducing safety and material compatibility issues. Despite the differences, Rankine and Brayton PTES may achieve similar efficiencies: 60-65% for Rankine PTES is claimed in Morandin et al (2012a,b) and Kim et al (2013), and similar figures are claimed for the Brayton PTES by Desrues et al (2010) and Laughlin (2017).…”

Section: Introductionmentioning

confidence: 99%

“…In Kim et al (2013), nearly isothermal compression and expansion are introduced by means of liquid piston compressors and expanders. Several different thermal storage technologies can be found in the literature: one-tank thermocline sensible heat storage (Staub et al, 2018), two-tanks sensible heat storage (Frate et al, 2020), several-tanks in series sensible heat storage (Morandin et al, 2012a,b), hybrid sensible/latent heat storage (Jockenhöfer et al, 2018;Steinmann et al, 2019), purely latent heat storage (Frate et al, 2017a), and underground geothermal heat storage (Ayachi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Many different working fluids were proposed in the literature: trans-critical CO 2 Rankine cycles (Morandin et al, 2012a,b), cascaded NH 3 /water vapor compression heat pump (VCHP) and water steam Rankine cycle (Steinmann, 2014), and VCHPs and organic Rankine cycles (ORCs) (Frate et al, 2017a(Frate et al, ,b, 2020Roskosch and Atakan, 2017;Jockenhöfer et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Multi-Criteria Economic Analysis of a Pumped Thermal Electricity Storage (PTES) With Thermal Integration

2020

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The interest toward large-scale electric energy storage technologies is increasing with the large deployment of new renewable capacity. In case of several hours of storage duration, there is no consensus on which technology is the most suited. Several technologies have been recently proposed, among which is pumped thermal electricity storage (PTES), which is a technology based on the idea of storing electrical energy as heat. PTES is usually less efficient than electrochemical batteries, but it is characterized by a lower cost per kilowatt hour, which could make it a suitable alternative for applications with long storage duration. In this study, a recently proposed PTES system based on the use of heat pumps and organic Rankine cycles is investigated from a thermo-economic point of view. The system is powered by both electric and low-grade thermal energy, thus taking advantage of waste heat to increase the electric performance. As the system design both affects efficiency and cost, a trade-off must be found. In this study, this task was performed by means of a multi-objective optimization approach. The relation between electrical round-trip efficiency and system cost is analyzed, and the impact of several design specifications such as boundary conditions, nominal power rating, and storage duration is discussed. Finally, the results are generalized by defining some cost scaling correlations. Large-size configurations (5 MW of charging power for 8 h of storage) may achieve equipment purchasing costs as low as 140 e/kWh and 2,300 e/kW, with an electrical round-trip efficiency of 0.6. These results show that the investigated technology may be suitable in the context of large-scale and long-duration energy storage.

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The Thermo‐Economic Potential of ORC‐Based Pumped‐Thermal Electricity Storage: Insights from the Integrated Design of Processes and Working Fluids

et al. 2022

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Higher shares of renewable energy increase the need for electricity storage. A promising storage technology is Pumped‐Thermal Electricity Storage (PTES): PTES systems transform electricity into heat using a heat pump (HP) and reconvert the heat into electricity using a heat engine. Since both HPs and heat engines require working fluids, maximum performance requires the optimal combination of PTES process and working fluids. Herein this work, the thermo‐economic potential of an Organic Rankine Cycle (ORC)‐based PTES system is analyzed by simultaneously designing both the PTES process and the working fluids used in the HP and the ORC. To rigorously explore the molecular design space, the 1‐stage Continuous‐Molecular Targeting ‐ Computer‐Aided Molecular Design method is employed. Detailed models for costing and sizing of the equipment allow for a thermo‐economic design of the PTES. The computer‐aided molecular design formulation integrates the working fluids as degrees of freedom into the process optimization. For the investigated ORC‐based PTES system with an input power of 60 MW, the optimal process and working fluids minimize the specific investment cost to SIC = 929 € kWh out − 1 . The analysis of cost drivers shows that with decreasing compressor cost, the investigated ORC‐based PTES system can become a competitive storage technology.

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A novel Pumped Thermal Electricity Storage (PTES) system with thermal integration

Cited by 126 publications

References 25 publications

Thermo-mechanical analysis of microcapsules containing phase change materials for cold storage

Thermo-mechanical analysis of microcapsules containing phase change materials for cold storage

Multi-Criteria Economic Analysis of a Pumped Thermal Electricity Storage (PTES) With Thermal Integration

The Thermo‐Economic Potential of ORC‐Based Pumped‐Thermal Electricity Storage: Insights from the Integrated Design of Processes and Working Fluids

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