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Design of a latent thermal energy storage system with embedded heat pipes

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  • Nithyanandam, K.
  • Pitchumani, R.

Abstract

Thermal energy storage plays an important role in extending the operation of a concentrating solar power (CSP) plant to times when sufficient solar energy is unavailable for generation of electricity. Extending the CSP plant operation increases its capacity factor and can lead to reduction in the levelized cost of electricity equivalent to that of fossil-fueled power plants. In view of this, latent thermal energy storage (LTES) system embedded with gravity-assisted heat pipes is considered in the present study. Transient numerical simulations are presented and the influence of the design and operating parameters on the dynamic charge and discharge performance of the system is analyzed to identify operating windows that satisfy the U.S. Department of Energy SunShot Initiative targets, which include, storage cost less than $15/kWht, round-trip exergetic efficiency greater than 95% and charge time less than 6h for a minimum discharge period of 6h. Overall, this study illustrates a methodology for design and optimization of LTES with embedded gravity assisted heat pipes (HP-TES) for a CSP plant operation.

Suggested Citation

  • Nithyanandam, K. & Pitchumani, R., 2014. "Design of a latent thermal energy storage system with embedded heat pipes," Applied Energy, Elsevier, vol. 126(C), pages 266-280.
    • Handle: RePEc:eee:appene:v:126:y:2014:i:c:p:266-280
    DOI: 10.1016/j.apenergy.2014.03.025
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    References listed on IDEAS

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    1. Nithyanandam, K. & Pitchumani, R., 2013. "Computational studies on a latent thermal energy storage system with integral heat pipes for concentrating solar power," Applied Energy, Elsevier, vol. 103(C), pages 400-415.
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    4. Nithyanandam, K. & Pitchumani, R. & Mathur, A., 2014. "Analysis of a latent thermocline storage system with encapsulated phase change materials for concentrating solar power," Applied Energy, Elsevier, vol. 113(C), pages 1446-1460.
    5. Herrmann, Ulf & Kelly, Bruce & Price, Henry, 2004. "Two-tank molten salt storage for parabolic trough solar power plants," Energy, Elsevier, vol. 29(5), pages 883-893.
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