Thermal insulation capability of nanostructured insulations and their combination as hybrid insulation systems

Lakatos, Ákos

doi:10.1016/j.csite.2022.102630

Cited by 13 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The introduction of EPS as a filling material has the potential to significantly avoid the convective heat transfer within the holes, resulting in a high thermal resistance [5]. Moreover, the field of materials science has witnessed the advent of graphitized EPS, a novel derivative of EPS with enhanced thermal conductivity properties (λ=0.031 W/mK) [6]. It opens new possibilities for enhancing the thermal performance of hollow bricks by incorporating graphitized EPS as a filling material.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of clay bricks with different fillings: a CFD analysis

Merli,

Susta,

Buratti

2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The thermal conductivity of 15 loadbearing and infill bricks was calculated through a Computational Fluid Dynamic (CFD) analysis. Clay bricks filled with air, expanded polystyrene EPS, and graphitized expanded polystyrene were selected from the catalogue of the manufacturer F.B.M. - Fornaci Briziarelli Marsciano. The company provided the geometric features of each block and the thermal characteristics of the clay mix and the filling. The thermal conductivity value of each air cavity was calculated in compliance with UNI EN ISO 6946. Each volume was discretized in triangular meshes. The equivalent thermal conductivity of each block was calculated starting from the simulation of the isotherms trend inside the sample and from the heat flux passing through it. The obtained results were discussed depending on the filling, the geometry, and the hole percentage. In general, thermal conductivity increases with hole percentage in the bricks with air. Similar geometries have similar thermal behaviour. EPS or graphitized EPS involve better thermal performance as the hole percentage increases. Finally, the influence of the different orientations of the blocks was investigated. Equivalent thermal conductivity values increase for horizontally-brick placed, especially in homogeneous and compact geometries.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal performance of clay bricks with different fillings: a CFD analysis

Merli,

Susta,

Buratti

2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…The thermal insulation materials used in construction can reduce the conduction and radiation of heat inside and outside of buildings, avoiding excessive consumption of heating and cooling, thereby maintain indoor temperature with minimum energy consumption of buildings. − The widespread use of thermal insulation materials in the envelope structures of buildings helps save energy and reduce greenhouse gas emissions for low-carbon living. , According to the classification of raw materials, thermal insulation materials for buildings can be divided into organic and inorganic types. − Organic thermal insulation materials have the characteristics of light weight, easy processing, low cost, high plasticity, and low thermal conductivity. However, organic thermal insulation materials have a very low LOI and produce a large amount of smoke when burned.…”

Section: Introductionmentioning

confidence: 99%

An Anisotropic Noncombustible Nanocomposite Based on a Fiberglass–Chitosan 3D Network for Building Insulation

Feng,

Yuan,

Wan

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Insulation materials can effectively reduce heat loss by conduction, thereby conserving energy in buildings. Traditional insulation materials usually consist of organic compounds, which are flammable. Despite the application of inorganic materials, such as fiberglass (GF), for their flame-retardant properties, their poor insulating performance and difficulties in dispersion and molding limit their use in construction. Therefore, creating a composite that effectively combines the high thermal insulation properties of organic materials with the high flame resistance of inorganic materials holds significant importance, yet poses substantial challenges. Herein, an Anisotropic Noncombustible Nanocomposite based on Fiberglass-Chitosan (ANNFC) has been prepared. GF was uniformly dispersed into the chitosan (CS) solution though hydrogen bonding. The ANNFC with anisotropic layered structures was prepared through a freeze-orientation process. The as-prepared ANNFC reached a high limiting oxygen index (LOI) of 99.48%, exhibited a low heat release rate (peak at 26 kW m −2 ), a low smoke production rate (peak at 0.00143 m 2 s −1 ), and a high compressive modulus (3.65 MPa). As a conceptual demonstration, a mini house was constructed using ANNFC. After being baked at a high temperature of 50 °C for 1 h, the interior of the ANNFC house maintained a relatively steady temperature of 37 °C. Therefore, the successfully constructed ANNFC provided a feasible path for fabricating thermal insulation materials for construction.

show abstract

“…Aerogels are formed by replacing the liquid component in the gel hole with a gas and are recognized as the lightest solid materials in the world. As porous materials, aerogels have high porosity and surface area, low density, and thermal conductivity. − These characteristics lead to their widespread use in catalyst carriers, sensors, absorbers, and aerospace materials. Aerogels derived from polymer materials exhibit excellent mechanical properties, thermal insulation properties, and environmental stability, allowing for their use in temperature sensing and fire safety. − If the aerogel is endowed with luminescence properties, the aerogel will have unique optical self-monitoring and tracer functions. , Considering the unique advantage that room-temperature phosphorescent (RTP) materials can continue to glow after the excitation light stops, their introduction into the aerogel system will not only provide a new research direction for the construction of aerogels with optical detection and tracer function but also effectively expand the macroscopic morphology and application range of RTP materials.…”

Section: Introductionmentioning

confidence: 99%

Water-Resistant and Thermal Insulation Aerogels Based on Polymers toward a Room-Temperature Phosphorescent Sensor

Gao,

Hu,

et al. 2024

ACS Appl. Opt. Mater.

View full text Add to dashboard Cite

Exploring the applicability of next-generation pure organic room-temperature phosphorescent (RTP) materials has become a research focus in recent years. Herein, a simple strategy for preparing a long-lived polymer aerogel temperature sensor with an ordered structure as well as thermal insulation was presented. Based on the noncovalent interactions between poly(vinyl alcohol) (PVA) and melamine formaldehyde (MF), a composite aerogel (PVA-MF) with excellent thermal stability, extremely low thermal conductivity, outstanding fire safety, and favorable mechanical strength was constructed. At the same time, PVA-MF aerogels doped with a series of organic phosphorescent small molecules exhibit stable multicolor long-lasting afterglow. In addition, the biphenyl 4-carboxylic acid (BPA)-doped PVA-MF aerogel also showed enduring water-resistant stability. Surprisingly, after repeated heating and cooling cycles, the on–off recording via a reversible temperature response of a continuous RTP signal was realized. Therefore, the aerogel with phosphorescent self-monitoring and tracer function not only promoted the development of aerogel phosphorescent materials but also expanded the application of RTP materials in temperature sensors.

show abstract

Thermal insulation capability of nanostructured insulations and their combination as hybrid insulation systems

Cited by 13 publications

References 36 publications

Thermal performance of clay bricks with different fillings: a CFD analysis

Thermal performance of clay bricks with different fillings: a CFD analysis

An Anisotropic Noncombustible Nanocomposite Based on a Fiberglass–Chitosan 3D Network for Building Insulation

Water-Resistant and Thermal Insulation Aerogels Based on Polymers toward a Room-Temperature Phosphorescent Sensor

Contact Info

Product

Resources

About