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Title: Demonstration of a Thermosyphon Thermal Valve for Controlled Extraction of Stored Solar Thermal Energy

Abstract

For concentrated solar power (CSP) to be an effective replacement for power generation by fossil fuels, the thermal energy must be stored and then released for when demand exceeds production, such as during off-sun hours. Until now, there has been limited methods to reliably and efficiently release and control the extraction of thermal energy from a material containing stored sensible or latent heat. Due to their isothermal property, phase change materials (PCMs) storing latent heat are an ideal choice for storage, though it has proven challenging to reliably extract and utilize that heat. To solve this problem, the geometry of a thermosyphon was rearranged to create a thermal valve that is able to turn the flow of thermal energy from a PCM 'on' and 'off'. A stainless steel thermal valve using sodium as the working fluid was designed, fabricated, assessed, and found to effectively and selectively extract heat from a 577 degrees C molten aluminum PCM. It is expected that thermal valves will significantly contribute to more widespread implementation of CSP as a stored energy source from distributed generation to utility-scale power production.

Authors:
 [1];  [1];  [2];  [1];  [3];  [3];  [3]; ORCiD logo [3];  [4];  [3];  [3]
  1. Colorado School of Mines
  2. SLAC National Accelerator Laboratory
  3. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  4. Bucknell University
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1487320
Report Number(s):
NREL/CP-5H00-72958
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems, 26-29 September 2017, Santiago, Chile
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 47 OTHER INSTRUMENTATION; concentrated solar power; thermal energy; phase change materials

Citation Formats

Oshman, Christopher, Rea, Jon, Hardin, Corey, Singh, Abhishek, Alleman, Jeffrey L, Olsen, Michele L, Glatzmaier, Gregory C, Parilla, Philip A, Siegel, Nathan, Ginley, David S, and Toberer, Eric. Demonstration of a Thermosyphon Thermal Valve for Controlled Extraction of Stored Solar Thermal Energy. United States: N. p., 2018. Web. doi:10.1063/1.5067115.
Oshman, Christopher, Rea, Jon, Hardin, Corey, Singh, Abhishek, Alleman, Jeffrey L, Olsen, Michele L, Glatzmaier, Gregory C, Parilla, Philip A, Siegel, Nathan, Ginley, David S, & Toberer, Eric. Demonstration of a Thermosyphon Thermal Valve for Controlled Extraction of Stored Solar Thermal Energy. United States. doi:10.1063/1.5067115.
Oshman, Christopher, Rea, Jon, Hardin, Corey, Singh, Abhishek, Alleman, Jeffrey L, Olsen, Michele L, Glatzmaier, Gregory C, Parilla, Philip A, Siegel, Nathan, Ginley, David S, and Toberer, Eric. Thu . "Demonstration of a Thermosyphon Thermal Valve for Controlled Extraction of Stored Solar Thermal Energy". United States. doi:10.1063/1.5067115.
@article{osti_1487320,
title = {Demonstration of a Thermosyphon Thermal Valve for Controlled Extraction of Stored Solar Thermal Energy},
author = {Oshman, Christopher and Rea, Jon and Hardin, Corey and Singh, Abhishek and Alleman, Jeffrey L and Olsen, Michele L and Glatzmaier, Gregory C and Parilla, Philip A and Siegel, Nathan and Ginley, David S and Toberer, Eric},
abstractNote = {For concentrated solar power (CSP) to be an effective replacement for power generation by fossil fuels, the thermal energy must be stored and then released for when demand exceeds production, such as during off-sun hours. Until now, there has been limited methods to reliably and efficiently release and control the extraction of thermal energy from a material containing stored sensible or latent heat. Due to their isothermal property, phase change materials (PCMs) storing latent heat are an ideal choice for storage, though it has proven challenging to reliably extract and utilize that heat. To solve this problem, the geometry of a thermosyphon was rearranged to create a thermal valve that is able to turn the flow of thermal energy from a PCM 'on' and 'off'. A stainless steel thermal valve using sodium as the working fluid was designed, fabricated, assessed, and found to effectively and selectively extract heat from a 577 degrees C molten aluminum PCM. It is expected that thermal valves will significantly contribute to more widespread implementation of CSP as a stored energy source from distributed generation to utility-scale power production.},
doi = {10.1063/1.5067115},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {11}
}

Conference:
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