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How pressure affects costs of power conversion machinery in compressed air energy storage; part II: Heat exchangers (2024)
Journal Article
Baniamerian, Z., Garvey, S., Rouse, J., Cárdenas, B., Pottie, D. L., Barbour, E. R., & Bagdanavicius, A. (2024). How pressure affects costs of power conversion machinery in compressed air energy storage; part II: Heat exchangers. Journal of Energy Storage, 86(Pt A), Article 111138. https://doi.org/10.1016/j.est.2024.111138

In the field of compressed air energy storage, a critical economic aspect that has been overlooked in existing literature relates to the influence of storage pressure on the capital cost of power conversion system. In Part I, a comprehensive study wa... Read More about How pressure affects costs of power conversion machinery in compressed air energy storage; part II: Heat exchangers.

A directly charged thermal store for compressed air energy storage systems (2023)
Journal Article
Cárdenas, B., & Garvey, S. (2023). A directly charged thermal store for compressed air energy storage systems. Journal of Energy Storage, 71, Article 108183. https://doi.org/10.1016/j.est.2023.108183

This paper discusses the design of a heat storage unit with integrated heat exchangers (TES + HX), which is intended to work in a Compressed Air Energy Storage (CAES) system. The unit can be charged directly by the system's stream of pressurised air,... Read More about A directly charged thermal store for compressed air energy storage systems.

Comparative Analysis of Isochoric and Isobaric Adiabatic Compressed Air Energy Storage (2023)
Journal Article
Pottie, D., Cardenas, B., Garvey, S., Rouse, J., Hough, E., Bagdanavicius, A., & Barbour, E. (2023). Comparative Analysis of Isochoric and Isobaric Adiabatic Compressed Air Energy Storage. Energies, 16(6), Article 2646. https://doi.org/10.3390/en16062646

Adiabatic Compressed Air Energy Storage (ACAES) is regarded as a promising, grid scale, medium-to-long duration energy storage technology. In ACAES, the air storage may be isochoric (constant volume) or isobaric (constant pressure). Isochoric storage... Read More about Comparative Analysis of Isochoric and Isobaric Adiabatic Compressed Air Energy Storage.

The effect of a nuclear baseload in a zero-carbon electricity system: An analysis for the UK (2023)
Journal Article
Cárdenas, B., Ibanez, R., Rouse, J., Swinfen-Styles, L., & Garvey, S. (2023). The effect of a nuclear baseload in a zero-carbon electricity system: An analysis for the UK. Renewable Energy, 205, 256-272. https://doi.org/10.1016/j.renene.2023.01.028

This paper explores the effect of having a nuclear baseload in a 100% carbon-free electricity system The study analyses numerous scenarios based on different penetrations of conventional nuclear, wind and solar PV power, different levels of overgener... Read More about The effect of a nuclear baseload in a zero-carbon electricity system: An analysis for the UK.

Electromechanical Analysis of Low Voltage Faults in a Magnetically Coupled Synchronous Generator Set (2022)
Conference Proceeding
Tweedy, O. R., Akcay, Y., Giangrande, P., Galea, M., & Garvey, S. D. (2022). Electromechanical Analysis of Low Voltage Faults in a Magnetically Coupled Synchronous Generator Set. In 2022 International Conference on Electrical Machines (ICEM 2022) (143-149). https://doi.org/10.1109/icem51905.2022.9910689

This paper investigates the magneto-mechanical performance of a magnetically coupled, engine driven synchronous generator set exposed to a severe low voltage grid fault. A multi-physics model of a generator, coaxial magnetic coupling and diesel engin... Read More about Electromechanical Analysis of Low Voltage Faults in a Magnetically Coupled Synchronous Generator Set.

Short-, medium-, and long-duration energy storage in a 100% renewable electricity grid: A UK case study (2021)
Journal Article
Cárdenas, B., Swinfen-Styles, L., Rouse, J., & Garvey, S. D. (2021). Short-, medium-, and long-duration energy storage in a 100% renewable electricity grid: A UK case study. Energies, 14(24), Article 8524. https://doi.org/10.3390/en14248524

Energy storage will be required over a wide range of discharge durations in future zero-emission grids, from milliseconds to months. No single technology is well suited for the complete range. Using 9 years of UK data, this paper explores how to comb... Read More about Short-, medium-, and long-duration energy storage in a 100% renewable electricity grid: A UK case study.

Modelling, Analysis and Design Considerations of Multi-Phase Bearingless Permanent Magnet Synchronous Machine (2021)
Conference Proceeding
Marfoli, A., Nardo, M. D., Garvey, S., Degano, M., Vashisht, R., Turnbull, R., & Gerada, C. (2021). Modelling, Analysis and Design Considerations of Multi-Phase Bearingless Permanent Magnet Synchronous Machine. In 2021 IEEE Energy Conversion Congress and Exposition (ECCE) (4646-4653). https://doi.org/10.1109/ECCE47101.2021.9595524

This paper presents a general multi-harmonics analytical model able to predict both torque and force behaviour of a multi-phase permanent magnet synchronous machine. This machine topology can be adopted in bearingless applications and in application... Read More about Modelling, Analysis and Design Considerations of Multi-Phase Bearingless Permanent Magnet Synchronous Machine.

A case study investigation into the risk of fatigue in synchronous flywheel energy stores and ramifications for the design of inertia replacement systems (2021)
Journal Article
Rouse, J., Garvey, S., Cárdenas, B., Hoskin, A., Swinfen-Styles, L., & Xu, W. (2021). A case study investigation into the risk of fatigue in synchronous flywheel energy stores and ramifications for the design of inertia replacement systems. Journal of Energy Storage, 39, Article 102651. https://doi.org/10.1016/j.est.2021.102651

Flywheels are an attractive energy storage solution for many reasons; high turnaround efficiencies, long cycling lives and high “ramp-up” power rates have all been noted in the literature. Novel flywheel based hybrid energy storage systems have also... Read More about A case study investigation into the risk of fatigue in synchronous flywheel energy stores and ramifications for the design of inertia replacement systems.

Analysis of the tribological interaction of a polytetrafluoroethylene-lined radial lip oil seal, shaft and lubricant sample (2021)
Journal Article
Shabbir, S., Garvey, S. D., Dakka, S. M., Rothwell, B. C., Su, R., Leach, R., & Weston, N. (2022). Analysis of the tribological interaction of a polytetrafluoroethylene-lined radial lip oil seal, shaft and lubricant sample. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 236(1), 123-143. https://doi.org/10.1177/13506501211005876

To investigate the tribological interaction and wear mechanisms of polytetrafluoroethylene-lined radial lip oil seals in service, a sleeve, seal and lubricant sample taken off a rotating rig are studied. The test was terminated at 72 h, after severe... Read More about Analysis of the tribological interaction of a polytetrafluoroethylene-lined radial lip oil seal, shaft and lubricant sample.

Seal Failure In Aerospace Applications -- Creating A Global Open-source Database (2021)
Journal Article
Shabbir, S., Garvey, S., Rothwell, B., & Dakka, S. (2021). Seal Failure In Aerospace Applications -- Creating A Global Open-source Database. Sealing Technology, 2021(2), 7-9. https://doi.org/10.1016/S1350-4789%2821%2900076-3

Seal failure in aerospace applications-creating a global open-source database Seals are essential components used in numerous applications across engineering. A seal is a component that impedes the flow of fluid through a given system. The word 'impe... Read More about Seal Failure In Aerospace Applications -- Creating A Global Open-source Database.

An Experimental Study of Contact Temperatures at Sealing Interface against Varying Shaft Surfaces (2021)
Journal Article
Shabbir, S., Garvey, S. D., Dakka, S. M., & Rothwell, B. C. (2021). An Experimental Study of Contact Temperatures at Sealing Interface against Varying Shaft Surfaces. Coatings, 11(2), Article 156. https://doi.org/10.3390/coatings11020156

Increased temperatures at the sealing interface between the seal and shaft can reduce the working life of a seal through elastomer aging, swelling and increased friction. Degradation of the seal due to increased temperatures can cause pre‐mature fail... Read More about An Experimental Study of Contact Temperatures at Sealing Interface against Varying Shaft Surfaces.

Experimental study of radial lip seals with different sleeve coatings (2020)
Journal Article
Shabbir, S., Garvey, S. D., Dakka, S. M., & Rothwell, B. C. (2020). Experimental study of radial lip seals with different sleeve coatings. Sealing Technology, 2020(3), 5-10. https://doi.org/10.1016/S1350-4789%2820%2930091-X

Radial Lip Seals with pre-loaded garter springs of 8.5oz, 12.5oz and 14oz are tested with 4 different sleeves to investigate various seal-sleeve combinations. To find optimum sleeve coating and seal combinations, leakage and performance is investigat... Read More about Experimental study of radial lip seals with different sleeve coatings.

Heat Transfer of Couette Flow in Micro-channels: an Analytical Model of Seals (2020)
Conference Proceeding
Shabbir, S., Garvey, S. D., Dakka, S. M., & Rothwell, B. C. (2020). Heat Transfer of Couette Flow in Micro-channels: an Analytical Model of Seals

Analytical solutions of the temperature profile of a fluid in a Couette flow between two parallel plates are reported. The upper plate moves in the direction of the flow with a constant velocity and the lower plate is stationary, to simulate the cond... Read More about Heat Transfer of Couette Flow in Micro-channels: an Analytical Model of Seals.

Aerospace Sealing Technology for Maintenance, Repair and Overhaul of Engines: a Review (2019)
Conference Proceeding
Shabbir, S., Garvey, S., & Dakka, S. M. (2019). Aerospace Sealing Technology for Maintenance, Repair and Overhaul of Engines: a Review.

Given the current rate of growth of gas turbine engines in the aerospace industry, the development of efficient and advanced sealing technology to cater to the harsh operating conditions of the aero-engines is crucial. In addition to developing low-l... Read More about Aerospace Sealing Technology for Maintenance, Repair and Overhaul of Engines: a Review.

A load-based approach for optimizing a packed-bed thermal store (2019)
Journal Article
Cárdenas, B., & Garvey, S. D. (2019). A load-based approach for optimizing a packed-bed thermal store. Journal of Energy Storage, 25, Article 100835. https://doi.org/10.1016/j.est.2019.100835

This paper presents a load-based optimization approach for improving the efficiency of a packed bed. The optimization is based on splitting the work-cycle of the thermal store into two frequency components: low and high. A packed bed is designed for... Read More about A load-based approach for optimizing a packed-bed thermal store.

Techno-economic optimization of a packed-bed for utility-scale energy storage (2019)
Journal Article
Cárdenas, B., Davenne, T., Wang, J., Ding, Y., Jin, Y., Chen, H., …Garvey, S. (2019). Techno-economic optimization of a packed-bed for utility-scale energy storage. Applied Thermal Engineering, 153, 206-220. https://doi.org/10.1016/j.applthermaleng.2019.02.134

The optimization of a packed bed for utility-scale applications is presented in this paper. The effects that particle size, aspect ratio and storage mass have on the roundtrip exergy efficiency of the store are thoroughly analysed. The paper seeks to... Read More about Techno-economic optimization of a packed-bed for utility-scale energy storage.

A series hybrid “real inertia” energy storage system (2018)
Journal Article
Rouse, J., Garvey, S., Cárdenas, B., & Davenne, T. (2018). A series hybrid “real inertia” energy storage system. Journal of Energy Storage, 20, 1-15. https://doi.org/10.1016/j.est.2018.08.006

The wide scale market penetration of numerous renewable energy technologies is dependent, at least in part, on developing reliable energy storage methods that can alleviate concerns over potentially interrupted and uncertain supplies. Many challenges... Read More about A series hybrid “real inertia” energy storage system.

The cold store for a pumped thermal energy storage system (2017)
Journal Article
Davenne, T., Garvey, S., Cardenas, B., & Simpson, M. (2017). The cold store for a pumped thermal energy storage system. Journal of Energy Storage, 14(2), https://doi.org/10.1016/j.est.2017.03.009

In recent years several proposals for thermodynamic cycles involving the compression and expansion of gas and thermal storage have been put forward as effective ways of storing energy. These include the work of Desrues [1] who proposed a thermal ener... Read More about The cold store for a pumped thermal energy storage system.

Novel stiffeners exploiting internal pressurisation to enhance buckling behaviour under bending loads (2016)
Journal Article
Polenta, V., Garvey, S. D., Chronopoulos, D., Long, A. C., & Morvan, H. (2016). Novel stiffeners exploiting internal pressurisation to enhance buckling behaviour under bending loads. Thin-Walled Structures, 105, https://doi.org/10.1016/j.tws.2016.04.002

The paper proposes a novel type of stiffener designed to bear bending loads by exploiting internal pressure effects. The stiffener is made of two adjacent thin-walled pipes (r/t?50) jointed with a connecting strip. Such a structure is shown to have h... Read More about Novel stiffeners exploiting internal pressurisation to enhance buckling behaviour under bending loads.