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Preparation and Heat Transfer Performance of Steel Ball Phase Change Concrete
Author(s) -
Hong Suk Chang,
Lihan Jin
Publication year - 2020
Publication title -
journal of new materials for electrochemical systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.496
H-Index - 42
eISSN - 1480-2430
pISSN - 1480-2422
DOI - 10.14447/jnmes.v23i3.a08
Subject(s) - materials science , cementitious , phase change material , heat transfer , heat exchanger , composite material , fly ash , pile , thermal energy storage , phase change , phase (matter) , volume (thermodynamics) , thermal conductivity , cement , structural engineering , thermodynamics , mechanical engineering , engineering , physics , chemistry , organic chemistry
Accompanied by a large amount of heat absorption and release during the phase change process, phase change concrete has the advantages of high energy storage density, low volume expansion ratio and approximate isotherm in the heat exchange. It is widely used in the building field. For this, using steel balls as the carrier material and butyl stearate as the phase change material (PCM), the authors combined the phase change energy storage material with the energy pile to prepare a new type of concrete energy pile enhanced with the PCMs. Then, the tests and numerical simulations were conducted to study the optimal mix ratio and thermal conductivity of the phase change concrete. The results show that adding steel balls (10% of the coarse aggregate volume), and slag and fly ash (5% of the cementitious material mass) to the ordinary concrete C30 can greatly improve the heat transfer efficiency of the energy pile. The research findings provide a guidance for engineering practice.

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