scholarly journals Inverted roof insulation kits and their durability

2018 ◽  
Vol 163 ◽  
pp. 08005 ◽  
Author(s):  
Barbara Francke ◽  
Robert Geryło
Keyword(s):  
Water Absorption ◽  
Thermal Insulation ◽  
Laboratory Tests ◽  
Expanded Polystyrene ◽  
Insulation Layer ◽  
Performance Properties ◽  
Climate Conditions ◽  
Freeze Thaw ◽  
Moisture Increase

In the paper there was analyzed a mechanism of loss of performance properties of inverted roof insulation kits resulted by moisture increase of the insulation layers. This problem is very important in such systems because the thermal insulation is placed above the waterproofing layer and is not protected against water absorption. Abovementioned problem is more and more common in the course of building’s utilization in Polish climate conditions. Because inverted roof kits are based on extruded polystyrene (XPS) and expanded polystyrene (EPS), those materials have been used in tested samples. The results of laboratory tests showed the phenomenon and its effect on durability and sustainability of roof covering performance. It was also found that the biggest influence on the increase of moisture in the thermal insulation layer has not the long term water absorption by immersion but freeze –thaw cycles.

scholarly journals Genetic Algorithm Applied to Multi-Criteria Selection of Thermal Insulation on Industrial Shed Roof

Buildings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 238 ◽  
Author(s):  
Stamoulis ◽  
Santos ◽  
Lenz ◽  
Tusset
Keyword(s):  
Genetic Algorithm ◽  
Thermal Comfort ◽  
Thermal Insulation ◽  
Optimization Technique ◽  
Building Envelope ◽  
Expanded Polystyrene ◽  
Insulation Material ◽  
Clothing Insulation ◽  
Climate Conditions ◽  
Selection Of

The rational use of energy has motivated research on improving the energy efficiency of buildings, which are responsible for a large share of world consumption. A strategy to achieve this goal is the application of optimized thermal insulation on a building envelope to avoid thermal exchanges with the external environment, reducing the use of heating, ventilation and air-conditioning (HVAC) systems. In order to contribute to the best choice of insulation applied to an industrial shed roof, this study aims to provide an optimization tool to assist this process. Beyond the thermal comfort and cost of the insulation, some hygrothermic properties also have been analysed to obtain the best insulation option. To implement this optimization technique, several thermo-energetic simulations of an industrial shed were performed using the Domus software, applying 4 types of insulation material (polyurethane, expanded polystyrene, rockwool and glass wool) on the roof. Ten thicknesses ranging from 0.5 cm to 5 cm were considered, with the purpose of obtaining different thermal comfort indexes (PPD, predicted percentage dissatisfied). Posteriorly, the best insulation ranking has been obtained from the weights assigned to the parameters in the objective function, using the technique of the genetic algorithm (GA) applied to multi-criteria selection. The optimization results showed that polyurethane (PU) insulation, applied with a thickness of 1 cm was the best option for the roof, considering the building functional parameters, occupant metabolic activity, clothing insulation and climate conditions. On the other hand, when the Brazilian standard was utilized, rock wool (2 cm) was considered the best choice.

scholarly journals Freeze-thaw risk in solid masonry: are moisture reference years able to represent real climate conditions?

2019 ◽  
Vol 282 ◽  
pp. 02034
Author(s):  
Isabeau Vandemeulebroucke ◽  
Steven Caluwaerts ◽  
Nathan Van Den Bossche
Keyword(s):  
Building Envelopes ◽  
Damage Criterion ◽  
Climate Conditions ◽  
Freeze Thaw ◽  
Start Date ◽  
New Methods ◽  
Smart Start ◽  
Wall Assembly ◽  
Selection Of

Today, there is no consensus on the selection method of representative exterior boundary conditions when performing HAM (Heat Air Moisture) simulations on building envelopes. Many existing methods to select moisture reference years (MRY) fail to provide an acceptable validation in terms of quantified risk assessment. Although new methods have been suggested during the past few years, the influence of several parameters on the selection of “critical years” in long-term datasets still needs to be assessed. The objective of this paper is to validate the application of MRY’s to evaluate freeze-thaw risk in retrofitted solid masonry. Furthermore, the influence of the chosen wall assembly, damage criterion, preconditioning and start date of the evaluation period on the ranking of critical years is assessed, using a 31-year meteorological dataset of Brussels. Results indicate that for a given wall assembly and freeze-thaw criterion, as well as a smart start date of the evaluated period, single year simulations entail a similar ranking of critical years as the corresponding year in the 31-year simulation. The number of critical freeze-thaw cycles only varies between 0 - 2 cycles (0 - 2.9%). However, changing the wall assembly and damage criterion, alters the top 5 ranking of critical years substantially.

Cooperative Performance of Sandwich Insulation Walls With Expanded Polystyrene Under Static Loads

2012 ◽  
Vol 602-604 ◽  
pp. 948-951
Author(s):  
De Ling Wang ◽  
Zhong Li
Keyword(s):  
Numerical Simulation ◽  
Thermal Insulation ◽  
Expanded Polystyrene ◽  
Vertical Load ◽  
Exterior Wall ◽  
Insulation Layer ◽  
Static Loads ◽  
Interface Friction ◽  
Ring Shape ◽  
Concrete Blocks

Sandwich insulation walls can bear loadings and insulate thermal which are fit for cold and freezing areas. In this paper, small-sized concrete hollow blocks are selected as interior and exterior wall; expanded polystyrene (EPS) plates are selected as thermal insulation layer which are put between inner and outer layers. Effects of several factors on cooperative performance of interior and exterior wall under static loads were analyzed by numerical simulation. These factors include the type of connection steel, the vertical load and the property of interface between EPS and concrete blocks. The results show that among the connection steel of ‘Z’ shape, ring shape and tie netting, the last is the best. Displacement difference between interior and exterior walls increases with increasing vertical load. And if the interface friction between EPS block and concrete blocks is considered, displacement and displacement difference of sandwich walls all increase. These results agree with similar tests.

scholarly journals Finite Element Analysis of Surrounding Rock with a Thermal Insulation Layer in a Deep Mine

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Hao Wang ◽  
Qianyu Zhou
Keyword(s):  
Finite Element ◽  
Thermal Insulation ◽  
Heat Dissipation ◽  
Heat Insulation ◽  
Surrounding Rock ◽  
Insulation Layer ◽  
Distribution Law ◽  
Element Analysis ◽  
Climate Conditions ◽  
Deep Mine

As the main heat source, surrounding rock heat dissipation is a very important factor in the prediction of mine climate conditions, especially in deep high-temperature mines. To reveal the heat control mechanism of surrounding rocks due to the thermal insulation of deep roadways, a mathematical model of the surrounding rocks around deep roadways with heat insulation was established with the finite element method, and a corresponding calculation program was developed. A series of results were determined to show how setting an insulation layer could affect the distribution law of the temperature field within and around tunnels. Therefore, rules of the variation in wall temperature and temperature gradient with thermal conductivity coefficients were obtained within and around tunnels. The heat release capacity of the surrounding rocks of the roadways is significantly reduced after introducing a thermal insulation layer into the roadway design under different schemes; these design schemes were determined by further engineering example analysis. It was found that the heat insulation layer design can cool the surrounding rocks of deep mine roadways.

scholarly journals Study on Water Absorption and Thermal Conductivity of Tunnel Insulation Materials in a Cold Region under Freeze-Thaw Conditions

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Youyun Li ◽  
Huan Wang ◽  
Li Yang ◽  
Shiqiang Su
Keyword(s):  
Thermal Conductivity ◽  
Water Absorption ◽  
Thermal Insulation ◽  
Insulation Material ◽  
Cold Region ◽  
Thermal Insulation Material ◽  
Freeze Thaw ◽  
Insulation Materials ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle

A thermal insulation layer is often deposited on the lining structure of tunnels in cold regions to solve the problem of frost damage. When the air humidity in the tunnel becomes excessively high, the thermal insulation material tends to absorb water, leading to significant changes in thermal conductivity. Moreover, the temperature differences between the day and night cycles have been observed to be significant in portal sections of cold region tunnels, which facilitate the freeze-thaw cycle and, consequently, deteriorate the performance of the thermal insulation material. Therefore, the purpose of this study is to determine the changes in the water absorption, thermal conductivity, and microstructure of polyurethane and polyphenolic insulation boards under freeze-thaw conditions. To this end, an indoor water absorption test was conducted for both the insulation boards till they were saturated, which then underwent a freeze-thaw cycle test. It was determined that the water absorption and thermal conductivities of these boards increased linearly with the number of freeze-thaw cycles. In order to explore the change of thermal conductivity of thermal insulation materials after moisture absorption, this study provides insights into the relationship between the thermal conductivities and water contents of tunnel insulation materials under normal and freezing temperatures.

scholarly journals Impact of Water-Repellent Products on the Moisture Transport Properties and Mould Susceptibility of External Thermal Insulation Composite Systems

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 554
Author(s):  
Renata Roncon ◽  
Giovanni Borsoi ◽  
João L. Parracha ◽  
Inês Flores-Colen ◽  
Rosário Veiga ◽  
...  
Keyword(s):  
Water Vapor ◽  
Water Absorption ◽  
Transport Properties ◽  
Thermal Insulation ◽  
Moisture Transport ◽  
Laboratory Tests ◽  
Water Vapor Permeability ◽  
Water Repellent ◽  
Vapor Permeability ◽  
Composite Systems

External Thermal Insulation Composite Systems (ETICS) are constructive solutions widely used to increase the thermal insulation in new and retrofitted buildings. However, these systems can present several anomalies due to their constant exposure to weathering agents and anthropic factors. Water is generally the major cause of degradation. Thus, the application of water-repellent products can minimize the appearance of anomalies and increase the durability of the systems. In this paper, acrylic-based and siloxane-based hydrophobic products were applied to ETICS, with the aim of assessing the compatibility, effectiveness, and durability of these products. The moisture transport properties and mould susceptibility were assessed through laboratory tests on untreated and treated specimens. The durability of the hydrophobic treatments was also evaluated through artificial aging tests (heat-cold and freeze-thaw cycles). Results show that the protection products generally decreased water absorption, slightly decreased the drying rate, and presented adequate water vapor permeability. After aging, the products still had reasonable effectiveness and, with one exception, improved the water vapor diffusion of the systems. Additionally, ETICS underwent an alteration in the finishing coat (possible modification of the porosity) due to the aging cycles. No clear linear correlation was found between the contact angle values and water absorption results, evidencing the influence of other factors related to the composition of the water-repellent products.

scholarly journals Heat radiation effects on insulating materials used in buildings

2021 ◽  
Author(s):  
Flóra Hajdu ◽  
Gabriella Lászlo ◽  
Rajmund Kuti
Keyword(s):  
Thermal Insulation ◽  
Laboratory Tests ◽  
Radiation Effects ◽  
Expanded Polystyrene ◽  
Heat Radiation ◽  
Insulation Material ◽  
Insulating Materials ◽  
Insulation Materials ◽  
Materials Used ◽  
Construction Permit

AbstractIn recent years, in order to increase the energy efficiency of older buildings in Hungary, several tenders have supported the modernization of the thermal insulation. Various thermal insulation materials have been installed on walls, on slab and on floor. Unfortunately there are cases where thermal insulation materials are not installed in accordance with the construction permit or the manufacturer’s instructions, which poses a serious danger in case of a fire. During the research the effects of heat on the behavior of Expanded PolyStyrene, a thermal insulation material often used in Hungary is examined. Laboratory tests and computer simulations were carried out, which are presented in detail in this paper. The aim of the research is to contribute to increase the fire safety of buildings.

scholarly journals Durability of Thermal Renders with Lightweight and Thermal Insulating Aggregates: Regranulated Expanded Cork, Silica Aerogel and Expanded Polystyrene

Gels ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 35
Author(s):  
André Morgado ◽  
António Soares ◽  
Inês Flores-Colen ◽  
Maria do Rosário Veiga ◽  
Maria Glória Gomes
Keyword(s):  
Thermal Insulation ◽  
Silica Aerogel ◽  
Energy Efficient ◽  
Accelerated Aging ◽  
Expanded Polystyrene ◽  
Ultra Sound ◽  
Freeze Thaw ◽  
Thermal Insulating ◽  
Before And After ◽  
Efficient Construction

Following the trend of energy-efficient construction, renders with thermal insulation properties have been studied for replacing conventional renders. However, there are still few studies on the durability of these renders that may become a barrier for their implementation. In this study, the performance of lightweight renders for thermal insulation to accelerated aging cycles and freeze/thaw cycles is discussed. For this purpose, renders with regranulated expanded cork (GEC), silica aerogel (SA), and expanded polystyrene (EPS) were produced and tested for compressive strength, ultra-sound velocity, Young’s modulus, and thermal conductivity before and after accelerated aging cycles (hygrothermal, IR and freeze/thaw cycles). With this study, a comparison between the influence of different aggregates on renders is carried out in order to understand their effect on different properties of renders.

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