Multi-dimensional transient temperature simulation and back-calculation for thermal properties of building materials

2013 ◽  
Vol 59 ◽  
pp. 501-516 ◽  
Author(s):  
Hui Li ◽  
John Harvey ◽  
David Jones
Keyword(s):  
Thermal Properties ◽  
Building Materials ◽  
Transient Temperature ◽  
Back Calculation

scholarly journals Testing a Gypsum Composite Based on Raw Gypsum with a Direct Admixture of Paraffin and Polymer to Improve Thermal Properties

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3241
Author(s):  
Krzysztof Powała ◽  
Andrzej Obraniak ◽  
Dariusz Heim
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Properties ◽  
Phase Change ◽  
Large Scale ◽  
Building Materials ◽  
Residential Buildings ◽  
Energy Performance ◽  
Polymer Content ◽  
Volumetric Heat Capacity

The implemented new legal regulations regarding thermal comfort, the energy performance of residential buildings, and proecological requirements require the design of new building materials, the use of which will improve the thermal efficiency of newly built and renovated buildings. Therefore, many companies producing building materials strive to improve the properties of their products by reducing the weight of the materials, increasing their mechanical properties, and improving their insulating properties. Currently, there are solutions in phase-change materials (PCM) production technology, such as microencapsulation, but its application on a large scale is extremely costly. This paper presents a solution to the abovementioned problem through the creation and testing of a composite, i.e., a new mixture of gypsum, paraffin, and polymer, which can be used in the production of plasterboard. The presented solution uses a material (PCM) which improves the thermal properties of the composite by taking advantage of the phase-change phenomenon. The study analyzes the influence of polymer content in the total mass of a composite in relation to its thermal conductivity, volumetric heat capacity, and diffusivity. Based on the results contained in this article, the best solution appears to be a mixture with 0.1% polymer content. It is definitely visible in the tests which use drying, hardening time, and paraffin absorption. It differs slightly from the best result in the thermal conductivity test, while it is comparable in terms of volumetric heat capacity and differs slightly from the best result in the thermal diffusivity test.

scholarly journals Influence of Lightweight Aggregate Concrete Materials on Building Energy Performance

Buildings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 94
Author(s):  
Tara L. Cavalline ◽  
Jorge Gallegos ◽  
Reid W. Castrodale ◽  
Charles Freeman ◽  
Jerry Liner ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Building Materials ◽  
Energy Savings ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
Building Energy ◽  
Energy Performance ◽  
Energy Simulation ◽  
Building Energy Simulation ◽  
Building Energy Performance

Due to their porous nature, lightweight aggregates have been shown to exhibit thermal properties that are advantageous when used in building materials such as lightweight concrete, grout, mortar, and concrete masonry units. Limited data exist on the thermal properties of materials that incorporate lightweight aggregate where the pore system has not been altered, and very few studies have been performed to quantify the building energy performance of structures constructed using lightweight building materials in commonly utilized structural and building envelope components. In this study, several lightweight concrete and masonry building materials were tested to determine the thermal properties of the bulk materials, providing more accurate inputs to building energy simulation than have previously been used. These properties were used in EnergyPlus building energy simulation models for several types of commercial structures for which materials containing lightweight aggregates are an alternative commonly considered for economic and aesthetic reasons. In a simple model, use of sand lightweight concrete resulted in prediction of 15–17% heating energy savings and 10% cooling energy savings, while use of all lightweight concrete resulted in prediction of approximately 35–40% heating energy savings and 30% cooling energy savings. In more complex EnergyPlus reference models, results indicated superior thermal performance of lightweight aggregate building materials in 48 of 50 building energy simulations. Predicted energy savings for the five models ranged from 0.2% to 6.4%.

scholarly journals Transient Infrared Measurement of Laser Absorption Properties of Porous Materials

2016 ◽  
Vol 16 (3) ◽  
pp. 167-173
Author(s):  
Andrzej Marynowicz
Keyword(s):  
Laser Beam ◽  
Building Materials ◽  
Optimization Technique ◽  
Infrared Camera ◽  
Transient Temperature ◽  
Absorption Properties ◽  
Porous Building Materials ◽  
Laser Absorption ◽  
Infrared Measurement ◽  
Heating Up

Abstract The infrared thermography measurements of porous building materials have become more frequent in recent years. Many accompanying techniques for the thermal field generation have been developed, including one based on laser radiation. This work presents a simple optimization technique for estimation of the laser beam absorption for selected porous building materials, namely clinker brick and cement mortar. The transient temperature measurements were performed with the use of infrared camera during laser-induced heating-up of the samples’ surfaces. As the results, the absorbed fractions of the incident laser beam together with its shape parameter are reported.

Measurements of Thermal Properties of Different Building Materials

2014 ◽  
Vol 1016 ◽  
pp. 733-737 ◽  
Author(s):  
Akos Lakatos
Keyword(s):  
Thermal Properties ◽  
Building Materials ◽  
Measurement Methods ◽  
Point Of View ◽  
Laboratory Measurements ◽  
Insulating Materials ◽  
Flux Measurements ◽  
Thermal Properties Of Materials ◽  
Properties Of Materials ◽  
Building Physics

In this paper we present measurements and measurement methods carried out on construction and building materials in our Building Physics laboratory in University of Debrecen, Faculty of Engineering, Hungary. The investigations with different methods are so significant from the point of view of thermal sizing and designing of the buildings. The laboratory measurements of the thermal properties of materials and in-built structures are very important either for the manufacturers or the designers. In this communication the measurement result are presented. Thermal conductivities will be calculated after steady state thermal resistance measurements both from Calibration hot box (CC) and Heat Flux measurements carried out by Hukseflux (HF) apparatus. Calorific values of some insulating materials will be presented after combusting them in a CAL2K ECO type bomb calorimeter.

Measurement of Thermal Properties of Biosourced Building Materials

2013 ◽  
Vol 35 (9-10) ◽  
pp. 1832-1852 ◽  
Author(s):  
Thomas Pierre ◽  
Thibaut Colinart ◽  
Patrick Glouannec
Keyword(s):  
Thermal Properties ◽  
Building Materials

scholarly journals Study of thermal properties on the different layers composing a commercial ceramic tile

2019 ◽  
Vol 65 (2) ◽  
pp. 124
Author(s):  
J. J. A. Flores Cuautle ◽  
G. Lara Hernandez ◽  
A. Cruz Orea ◽  
E. Suaste Gomez ◽  
C. Hernandez Aguilar ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Energy Transfer ◽  
Thermal Properties ◽  
Ceramic Tile ◽  
Building Materials ◽  
Photothermal Techniques ◽  
Essential Factor ◽  
Wide Range ◽  
Thermal Insulations ◽  
Enamel Layer

In this study is determined the thermal conductivity of a commercial ceramic considering that this property on the building materials is an essential factor, and it is the primary indicator of the suitableness of the material in the energy transfer considering that this kind of materials has many applications as thermal insulations. In this sense and considering that a commercial tile is usually composed of three layers, a substrate, a so-called engobe layer, and an enamel layer. Likewise, the thermal properties of the different layers were obtained individually by using two photothermal techniques on the ceramic material; the ceramic tile density was obtained using the Archimedes method. The calculated values show a wide range of thermal conductivity values for the different layers, ranging from1.3 to 4 W m-1K-1. 

Sign in / Sign up

Export Citation Format

Share Document