Characterization of novel shape‐stabilized phase change material mortar: Portland cement containing Na ₂ SO ₄ ·10H ₂ O and fly ash for energy‐efficient building

Abstract

Summary In this work, a novel Na2SO4·10H2O/fly ash shape‐stabilized phase change material mortar (PCM mortar) was prepared for building energy efficiency, in the context of energy conservation and environmental protection. The working, mechanical, and thermal properties of this proposed PCM mortar were investigated. The experiment results showed that the incorporation of PCMs greatly increased the thermal inertia of the mortar, while corresponding compressive strength was little affected. Specifically, when the blending amount of PCMs reached 15%, the thermal storage capacity of mortar sample (PCM‐15) was 6.18 × 104 kJ/m3, which is 2.4 times of that for mortar sample without PCM (OPC) evaluated by theoretical calculations, while the corresponding compressive strength of mortar sample (PCM‐15) still remained above 31 MPa. Furthermore, the effects of PCM mortar on thermal comfort and energy use of buildings were studied by using experiment and simulation methods, respectively. The control experiments showed that PCM mortar can effectively alleviate the influence of outdoor temperature on indoor temperature compared with OPC. Temperature difference between PCM‐15 and OPC board can reach 4.6°C (inner surface) and 8.6°C (outer surface), respectively. Meanwhile, temperature difference of internal space reached 1.2°C. The simulation results showed that the energy consumption per unit building area was reduced by 4.4 and 18.7 kg/m2 in Guangzhou and Harbin, respectively, with PCM mortar as the envelope structure. Hence, the proposed PCM mortar showed significant thermal and mechanical properties and had broad application prospects in regulating indoor temperature and constructing energy‐efficient buildings.

PolyHIPE composite based‐form stable phase change material for thermal energy storage

“…In addition, fly ash (FA) is a porous solid waste which can be used for preparation of shape‐stabilized PCMs. Liu et al used FA as a carrier for forming Na 2 SO 4 •10H 2 O/FA composite PCM, and then this composite material was used for obtaining PCM mortar 36 . In another work, a PCM composite consisted of mixture of capric acid and lauric acid was prepared via absorption by FA for building energy efficiency 37 .…”

Development and energy evaluation of phase change material composite for building energy‐saving

“…[20][21][22] Moreover, another problem is that the transition temperature of present PCMs is usually not suitable for the use in building envelopes. [20][21][22] Moreover, another problem is that the transition temperature of present PCMs is usually not suitable for the use in building envelopes.…”

“…However, there are many limitations in the application of the construction materials incorporating PCMs, such as leakage and corrosion, which problems could be solved by the synthesis technology of shape-stabilized PCMs. [20][21][22] Moreover, another problem is that the transition temperature of present PCMs is usually not suitable for the use in building envelopes. Capric acid (CA) and lauric acid (LA) not only have high latent heat of phase transformation, but can also obtain PCMs composite with appropriate phase transition temperature in indoor comfort zone when mixed in different proportions.…”

Preparation and characterization of erythritol/polyaniline form‐stable phase change materials containing silver nanowires

“…7 The thermal energy is stored by the solidliquid PCMs, while the supporting materials maintain the solid shape of the form-stable PCMs. The supporting materials for form-stable PCMs can be ether inorganics such as diatomite, 6 SiO 2,8 TiO 2 9 and fly ash, 10 etc., or polymers such as polymethyl methacrylate, 11 polyurethane, 12 resin, 13 and polyaniline (PANI), 14,15 etc. Graphite-based materials are another kind of important supporting materials.…”

“…The supporting materials for form-stable PCMs can be ether inorganics such as diatomite, 6 SiO 2, 8 TiO 2 9 and fly ash, 10 etc., or polymers such as polymethyl methacrylate, 11 polyurethane, 12 resin, 13 and polyaniline (PANI), 14,15 etc. The supporting materials for form-stable PCMs can be ether inorganics such as diatomite, 6 SiO 2, 8 TiO 2 9 and fly ash, 10 etc., or polymers such as polymethyl methacrylate, 11 polyurethane, 12 resin, 13 and polyaniline (PANI), 14,15 etc.…”