Development, characterization, and performance analysis of shape‐stabilized phase change material included‐geopolymer for passive thermal management of buildings

Abstract

The cooperation between phase change materials (PCMs) and geopolymer (GP) is energy-efficient way for improving the thermal performance of construction materials. This study discusses the effect of PCM combination with GP matrix on obtained concretes' mechanical and thermal properties. Attapulgite/lauric-capric acid eutectic mixture (ATP/LCEM) composite was fabricated as shape-stable composite phase change material (SSPCM) and then integrated with GP concrete (GPC) for improvement of the thermal mass of buildings. Thermal, mechanical, physical, morphological, thermal energy storage (TES) characteristics, and solar thermoregulation performances of the developed GPC-SSPCMs were experimentally characterized. The compressive strength was found over 6 MPa for GPC without aggregates (only SSPCM). The compressive and flexural strengths were relatively low, but above the requirements of the current standards. Other properties as thermal conductivity and solar performance make the produced GPC-SSPCMs promising materials for advanced TES applications in buildings. The apparent porosity was around 45% for GPC-SSPCM-50 and 63% for GPC-SSPCM-100, while water adsorption around 21% for GPC-SSPCM-50 and 30% for GPC-SSPCM-100. Thermal conductivity values of 0.375 W/mK for GPC without aggregates recommended this material as an insulator. The produced SSPCM composite melts at 19.00 C with corresponding latent heat of 73.9 J/g, while the GPC-SSPCM melts at 18.30 C with corresponding latent heat of 6.57 J/g. Based on the obtained outcomes, the energy-saving was determined as 5.56 kWh, which is corresponding to the CO 2 saving of 15 kg-CO 2 , 14.68 kg-CO 2 , and 2.41 kg-CO 2 in case of using coal, natural gas, or electricity, respectively as energy source.

Assessing the Co, Bi, and Mg Contents of Some Mineral Concrete Additives in terms of Environmental Effects

“…Remaining undegraded in nature for a long time since it has a long half-life, heavy metals that accumulate in bodies of organisms and can be toxic or carcinogenic even when at low concentrations are considered as one of the most dangerous environmental pollution factors [57][58][59][60]. For this reason, use of waste materials (especially heavy metals), many of which are important environmental pollutants, as a concrete additive is very important since it decreases the cost of concrete and it contributes to the reduction of environmental pollution by eliminating the environmental pollutants through recycling [61][62][63][64]. For this reason, many studies examining the use of various waste materials as concrete additives were carried out in recent years [65][66][67].…”

A form-stable phase change material based on intermolecular hydrogen bonding with a high chemical recycling rate

“…[4][5][6] Because of their high thermal energy storage capacity, negligible temperature variation in phase change procedures, low cost and wide range of sources, [7][8][9] PCMs have been employed in many important fields, such as solar thermal energy storage, 10 off-peak electricity storage 11 and thermal management for batteries 12 and buildings. 13 The forms of PCMs include solid-solid, solid-liquid, liquid-gas and solid-gas. 14,15 Solid-liquid PCMs (SLPCMs) are the most practical among all PCMs because their volume change during phase change processes is small, and their latent heat values are sufficiently high.…”

“…4–6 Because of their high thermal energy storage capacity, negligible temperature variation in phase change procedures, low cost and wide range of sources, 7–9 PCMs have been employed in many important fields, such as solar thermal energy storage, 10 off-peak electricity storage 11 and thermal management for batteries 12 and buildings. 13…”

Thermal Management Analysis of Proton Exchange Membrane Fuel Cell Filled with Phase Change Material in Cooling Channel

“…Hamidi et al [22] reviewed the research related to enhancing the heat transfer of metal foam with PCM. Osman et al [23] studied the application of PCM in building thermal management. As power sources, Li-ion batteries and fuel cells have high-temperature uniformity requirements.…”