Assessing geothermal/solar hybridization – Integrating a solar thermal topping cycle into a geothermal bottoming cycle with energy storage

McTigue, Joshua Dominic P.; Wendt, Daniel; Kitz, Kevin; Gunderson, Joshua; Kincaid, Nicholas D.; Zhu, Guangdong

doi:10.1016/j.applthermaleng.2020.115121

Title: Assessing geothermal/solar hybridization – Integrating a solar thermal topping cycle into a geothermal bottoming cycle with energy storage

Abstract

Geothermal and concentrating solar power (CSP) technologies typically use heat at different temperatures in their commercial deployments. This enables a technically viable hybridization of a solar topping cycle and a geothermal bottoming cycle at locations where both resources are available. In this article, an underperforming geothermal power system based at Burley, Idaho is used as a baseline to investigate the technical and economic potential of such a hybrid cycle. A direct thermal energy storage (TES) system is also integrated to overcome the intermittency of the solar resource. Design and off-design behavior of key components are modelled to simulate the annual performance of the hybrid system on an hourly basis. The sizing of the solar field and thermal storage is investigated and is seen to significantly impact the annual electricity generation and efficiency. Various cost scenarios for the solar field and thermal energy storage are investigated. An economic metric - levelized cost of electricity (LCOE) - is used to optimize the solar field sizing and TES capacity. The hybrid plant converts the additional solar heat input into additional work with an efficiency of 32.9%. Retrofitting a geothermal plant with solar and eight hours of energy storage can achieve an LCOE ofmore »« less

Authors:

^[1]; Wendt, Daniel ^[2]; Kitz, Kevin ^[3]; Gunderson, Joshua ^[4]; Kincaid, Nicholas D. ^[1];

^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States)
KitzWorks LLC, Boise, ID (United States)
POWER Engineers, Hailey, ID (United States)

Publication Date:: Sat Feb 22 00:00:00 EST 2020

Research Org.:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office

OSTI Identifier:: 1603923

Alternate Identifier(s):: OSTI ID: 1703871

Report Number(s):: NREL/JA-5500-74317
Journal ID: ISSN 1359-4311

Grant/Contract Number:: AC36-08GO28308

Resource Type:: Accepted Manuscript

Journal Name:: Applied Thermal Engineering

Additional Journal Information:: Journal Volume: 171; Journal Issue: C; Journal ID: ISSN 1359-4311

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 15 GEOTHERMAL ENERGY; 29 ENERGY PLANNING, POLICY, AND ECONOMY; geothermal power; concentrating solar power; thermal energy storage; retrofit; levelized cost of electricity; hybrid power plant

Citation Formats


                    McTigue, Joshua Dominic P., Wendt, Daniel, Kitz, Kevin, Gunderson, Joshua, Kincaid, Nicholas D., and Zhu, Guangdong. Assessing geothermal/solar hybridization – Integrating a solar thermal topping cycle into a geothermal bottoming cycle with energy storage.  United States: N. p., 2020. 
Web.  doi:10.1016/j.applthermaleng.2020.115121.

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                    McTigue, Joshua Dominic P., Wendt, Daniel, Kitz, Kevin, Gunderson, Joshua, Kincaid, Nicholas D., & Zhu, Guangdong. Assessing geothermal/solar hybridization – Integrating a solar thermal topping cycle into a geothermal bottoming cycle with energy storage.  United States.  https://doi.org/10.1016/j.applthermaleng.2020.115121

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                    McTigue, Joshua Dominic P., Wendt, Daniel, Kitz, Kevin, Gunderson, Joshua, Kincaid, Nicholas D., and Zhu, Guangdong. Sat .  
"Assessing geothermal/solar hybridization – Integrating a solar thermal topping cycle into a geothermal bottoming cycle with energy storage".  United States.  https://doi.org/10.1016/j.applthermaleng.2020.115121.  https://www.osti.gov/servlets/purl/1603923.

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@article{osti_1603923,

  title        = {Assessing geothermal/solar hybridization – Integrating a solar thermal topping cycle into a geothermal bottoming cycle with energy storage},

  author       = {McTigue, Joshua Dominic P. and Wendt, Daniel and Kitz, Kevin and Gunderson, Joshua and Kincaid, Nicholas D. and Zhu, Guangdong},

  abstractNote = {Geothermal and concentrating solar power (CSP) technologies typically use heat at different temperatures in their commercial deployments. This enables a technically viable hybridization of a solar topping cycle and a geothermal bottoming cycle at locations where both resources are available. In this article, an underperforming geothermal power system based at Burley, Idaho is used as a baseline to investigate the technical and economic potential of such a hybrid cycle. A direct thermal energy storage (TES) system is also integrated to overcome the intermittency of the solar resource. Design and off-design behavior of key components are modelled to simulate the annual performance of the hybrid system on an hourly basis. The sizing of the solar field and thermal storage is investigated and is seen to significantly impact the annual electricity generation and efficiency. Various cost scenarios for the solar field and thermal energy storage are investigated. An economic metric - levelized cost of electricity (LCOE) - is used to optimize the solar field sizing and TES capacity. The hybrid plant converts the additional solar heat input into additional work with an efficiency of 32.9%. Retrofitting a geothermal plant with solar and eight hours of energy storage can achieve an LCOE of 0.136 $/kWhe in current cost scenarios and 0.081 $/kWhe in a future cost reduction scenario. Although the hybrid system cannot directly compete with current PV systems without batteries, it has an LCOE 32% lower than that of a PV-battery system. This paper provides insights into the research and development of the future grid with a high renewable energy penetration and encourages further study of energy hybridization for improved efficiencies and economics.},

  doi          = {10.1016/j.applthermaleng.2020.115121},

  journal      = {Applied Thermal Engineering},

  number       = C,

  volume       = 171,

  place        = {United States},

  year         = {Sat Feb 22 00:00:00 EST 2020},

  month        = {Sat Feb 22 00:00:00 EST 2020}

}

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Title: Assessing geothermal/solar hybridization – Integrating a solar thermal topping cycle into a geothermal bottoming cycle with energy storage

Abstract

Citation Formats

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