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Demonstration of thermal energy storage system with salt hydrate phase change material composite.

Number: 3509

Author(s) : HIRSCHEY J., GLUESENKAMP K. R., GRAHAM S., WOODRUFF G. W.

Summary

Thermal energy storage (TES) decouples heat generation from use, providing a crucial tool to mitigate fluctuating thermal loads. TES systems may often contain a phase change material (PCM) which stores heat isothermally through the enthalpy of phase change, and thus the TES as a whole operates at a near constant temperature. Integrated into a heat pump (HP) or heat transfer fluid (HTF) circulation loop, the TES will behave as an isothermal heat exchanger (HX), absorbing or releasing heat into the HTF. For near-ambient TES (-15-85°C), solid-liquid PCMs provide the highest energy storage density. However, the PCMs available in this temperature range often have low thermal conductivity that hinder the power capacity of a TES. As such, modifications such as metallic extended surfaces or fins are made to the TES to increase its power capacity. This work instead uses an enhanced PCM composite material in a simple and scalable shell-and-tube design. In this work, two prototype-scale TES units are demonstrated: 1) a benchtop scale unit as a proof-of-concept with targeted specifications 50 W, 100 Wh, and 2) an intermediate scale with target specifications 200 W, 0.8 kWh. The PCM composite is based on sodium sulfate decahydrate (SSD) and high thermal conductivity expanded graphite (EG). Both TES units containing this material met or exceeded design performance. The design, production method, and performance results are discussed.

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Pages: 10 p.

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  • Original title: Demonstration of thermal energy storage system with salt hydrate phase change material composite.
  • Record ID : 30030249
  • Languages: English
  • Source: 2022 Purdue Conferences. 7th International High Performance Buildings Conference at Purdue.
  • Publication date: 2022
  • Document available for consultation in the library of the IIR headquarters only.

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