Modeling and optimal design of thermal storage devices based on effectiveness-NTU approach and exergy recovery maximization

doi:10.12028/j.issn.2095-4239.2017.0068

Abstract

Abstract: Thermal energy storage (TES) has been regarded as a key to the effective and efficient use of renewable energy and the recovery of waste heat, and hence attracted significant attention in the past few decades. Published research on TES includes materials, devices and systems. This paper presents a study for the optimization of thermal storage devices employing either sensible heat storage or latent heat storage. The process of thermal storage was modeled by the lumped parameter method and the design of the device was investigated by the effectiveness-NTU analysis. An exergy recovery ratio was defined for the device and the optimisation of the device design was achieved by maximizing the ratio by a search algorithm. A case study was carried out, which confirmed the feasibility and robustness of the optimization method. The results showed that there was an optimal combination of the material load and operation temperature range in sensible heat storage devices, while an optimal melting point is more important in latent heat storage devices. The thermal storage material amount required in a single-stage latent heat storage device could be reduced significantly compared with that for a sensible heat storage device. We also found that an optimized multi-stage latent heat storage device was shown to have a higher exergy recovery.

Key words: thermal storage device, exergy, modeling, optimal design

WANG Shuhao1, HUANG Yun1, LI Dacheng1, ZHAO Yanqi2, LI Yongliang2, DING Yulong2, GE Weichun3, FU Yu3. Modeling and optimal design of thermal storage devices based on effectiveness-NTU approach and exergy recovery maximization[J]. Energy Storage Science and Technology, 2017, 6(4): 748-752.

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