Abstract
Renewable energy storage is now essential to enhance the energy performance of buildings and to reduce their environmental impact. Many heat storage materials can be used in the building sector in order to avoid the phase shift between solar radiation and thermal energy demand. However, the use of storage material in the building sector is hampered by problems of investment cost, space requirements, mechanical performance, material stability, and high storage temperature. Cementitious material is increasingly being used as a heat storage material thanks to its low price, mechanical performance and low storage temperature (generally lower than 100 °C). In addition, cementitious materials for heat storage have the prominent advantage of being easy to incorporate into the building landscape as self-supporting structures or even supporting structures (walls, floor, etc.). Concrete solutions for thermal energy storage are usually based on sensible heat transfer and thermal inertia. Phase Change Materials (PCM) incorporated in concrete wall have been widely investigated in the aim of improving building energy performance. Cementitious material with high ettringite content stores heat by a combination of physical (adsorption) and chemical (chemical reaction) processes usable in both the short (daily, weekly) and long (seasonal) term. Ettringite materials have the advantage of high energy storage density at low temperature (around 60 °C). The encouraging experimental results in the literature on heat storage using cementitious materials suggest that they could be attractive in a number of applications. This paper summarizes the investigation and analysis of the available thermal energy storage systems using cementitious materials for use in various applications.
Highlights
World energy consumption has huge environmental and socioeconomic impacts
Concrete solutions for thermal energy storage are usually based on sensible heat transfer and thermal inertia [2,3,4,5,6,7] and numerous numerical studies have been performed on sensible heat storage using concrete [8,9,10,11]
This review aims to compile the advances made in cementitious material for heat storage and the place such materials occupy among the usual storage materials used in the building sector
Summary
World energy consumption has huge environmental and socioeconomic impacts. Heat storage allows the use of renewable energy in buildings to be increased and enhances their energy storage performance. Several models have been developed to predict the heat storage performance and the thermal or mechanical properties of concrete containing phase change materials [16,25,26,27,28]. These materials are not suitable for long-term heat storage. Thermodynamic or kinetic models have been designed to simulate chemical reactions that allow heat to be stored [47,48,49,50] Despite their high storage density, the main problems of chemical storage materials are high storage temperature (500 °C for calcium hydroxide), low mechanical resistance and high investment cost.
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