External Wall Thermal Insulation Research Articles

Life Cycle Assessment of External Thermal Insulation Composite System Based on Rock Wool Board

Although external wall thermal insulation layer protects the major structure effectively and is capable of the prolonging of the service life of the structure, building thermal insulation material production brings environmental impact in some degree. In this research, quantitative analysis and evaluation of resources consumption and pollutant emission caused by materials on external wall were carried out based on Life Cycle Assessment (LCA). The results show that, the environmental load brought by rock wool board production has a decisive influence on the total environmental load of the external thermal insulation system production.

The Research on Seismic Performance of the Insulation Material on the External Wall of a Building

It is a problem on building energy efficiency of how to improve the heat insulation performance of building envelope, to make the building outer wall has good heat preservation effect, and to keep the necessary seismic performance. Exterior wall thermal insulation engineering, which is a key part on building energy conservation engineering construction quality acceptance and on building energy efficiency design, is an important part in building energy efficiency projects. Therefore, it is necessary to study the seismic performance based on the fact that the building is building energy efficiency. By the research on exterior insulation materials, the analysis on the performance of external thermal insulation materials currently used, and the research on the factors affecting the seismic performance of external thermal insulation material, It provides a guidance on evaluating the external wall thermal insulation material performance and quality, ensuring the quality of external thermal insulation material, and it is expected to achieve the effect of building energy efficiency.

Study on Building Materials with Exterior Insulation System Problems and Solutions

Building palisade structure is the most important part of the wall, so the external wall thermal insulation technology has become an important part of building energy efficiency. After the author found the domestic use of insulation materials in a variety of forms, different use method makes the external wall thermal insulation system has a problem. The analysis of the cause of the problem at the same time, this paper discusses how to use of selected materials and improving the construction methods to avoid the happening of the accident.

Structure and Construction Technology of New-Type External Thermal Insulation in Outer Wall

There are many kinds of external wall thermal insulation, such as wire mesh, rock wool board external insulation, powder particles of polystyrene insulation slurry, and EPS exterior insulation, etc. Among all these technologies, the technology of EPS external insulation composite wall is applied more and more in China. This article aims at the research of the EPS external thermal insulation composite wall structure and the relevant construction technology.

Analysis of Thermal Performance of a New Regenerated Glass Pumice External Wall Insulation System in Hot Summer and Cold Winter Zone

The thermal performance of a new regenerated glass pumice board as external wall thermal insulation material was analyzed in this paper. Considering the roles of solar radiation and air convection, and selecting Wuhan city as an example of the hot summer and cold winter zones, the temperature field distributions of the external building walls in different orientations in summer and winter seasons were numerically simulated by using the finite element software ANSYS. The thermal performance of regenerated glass pumice exterior wall external insulation system including the heat transfer coefficient and the temperature distribution was evaluated. The simulation results demonstrate the good thermal insulation performance of the regenerated glass pumice as a new kind of external wall materials, and the feasibility of the application of this environmentally friendly material to the wall insulation system in energy conservation building is also promoted.

Energy Performances of a Passive Building in Marrakech: Parametric Study

This paper deals with the modeling of a villa type house located in the Marrakech (Morocco) suburb. The house is constituted of two floors and was designed to be energy efficient by integrating some passive techniques: overhangs, an Earth-to-Air Heat Exchanger (EAHX), thermal insulation of the roof and external walls. Most of these systems are unusual in Marrakech buildings; thus the objective of this work is to study their effects on the house cooling and heating loads. The modeling of the house is a multi-zone one and it was carried out during one year. The effects of the passive systems on air temperature in the building, as well as on its cooling/heating load, are analyzed through the modeling of 5 cases. The first case is the real house and the others correspond to the lack of one of the system (i.e. the overhang along the south facade in the second floor, thermal insulation of the roof and thermal insulation of external walls), the fifth case correspond to the lack of all the systems (“standard house”). The results show that some of these systems reduce the maximum temperature, while some others act only on the minimum temperature by increasing it. The first systems reduce the cooling load and are very efficient in summer (this is the case, especially, of the thermal insulation of the roof). The other systems reduce the heating load and have a small effect on the cooling load. It should be mentioned that the heating load of the real house is negligible compared to the cooling one. One of the interesting results is that, corresponding to the effect of thermal insulation of external walls. This insulation has a small beneficial effect on the heating load while it increases the cooling load.

Building External Wall Thermal Insulation Construction Quality Safety Measures Analysis

The external wall thermal insulation technology in building energy saving is widely used in engineering, but in general it faces some quality security problems, this paper insulation material selection, exterior insulation system and its safety, fire redundancy and external wall construction corresponding measures on the analysis. So as to the engineering quality safety problems have prevention in the role of the external wall thermal insulation technology obtain the considerable development.

Study of the Density Control of the Low Density Sulphate Aluminium Cement (SAC) Foam Concrete

With enhancement of the energy conservation of the building and the external wall thermal insulation material fire protection level, the preparation of low density foam concrete has become the hot spot of the material engineer. The main factors, influencing the low density light foam concrete, include the selection and dosage of cementitous material and admixture, the volume of foam, water consumption and chemical admixture for concrete. This paper mainly discusses the effects of the dosage of water reducing agent, the admixture partly replacing SAC, the weight of water and binder and the volume proportion of slurry and foam on the density control of low density light foam concrete.

Economic and ecological indicators for thermal insulating building investments

A big amount of final energy in Europe is used in buildings (about 50%). Thermo insulating investments in the building sector can have a great impact on the improvement of the energetic efficiency of buildings and the reduction of the use of final energy in this sector. In the paper there were presented properly modified indicators for the economic assessment of the investments which is based on the thermal insulation of external walls of the building, such as: net present value, profitability indicator and payback period. For the ecological assessment the following indicators were introduced: ecological net present value, ecological indicator of profitability and ecological payback period. LCA technique was used in ecological indicators. For different variants of external walls, sources of heat and thermo insulating materials, the assessment of investments due to economic and ecological indicators was conducted. Ecological payback periods were obtained within 0–6 years.

Energy, cost, and CO2 emission comparison between radiant wall panel systems and radiator systems

The main goal of this paper is to evaluate the possibility of application or replacement of radiators with low-temperature radiant panels. This paper shows the comparison results of operations of 4 space heating systems: the low-temperature radiant panel system without any additional thermal insulation of external walls (PH-WOI), the low-temperature radiant panel system with additional thermal insulation of external walls (PH-WI), the radiator system without any additional thermal insulation of external walls (the classical heating system) (RH-WOI), and the radiator system with additional thermal insulation of external walls (RH-WI). The operation of each system is simulated by software EnergyPlus. The investigation shows that the PH-WI gives the best results. The RH-WOI has the largest energy consumption, and the largest pollutant emission. However, the PH-WI requires the highest investment.

Insulation and Fireproof Performance of Several New Materials for Exterior Wall

Exterior insulation is currently promoting a building energy-saving insulation technology. Compared with internal insulation, it is a reasonable technique and has its obvious advantages. However, in the insulation material, thermal insulation effect is better, fireproof performance is often worse. Through analyzing several external wall insulation materials’ insulation and fireproof performance, the article recommends a kind of external wall thermal insulation material with good insulation and fireproof performance, to meet the construction needs.

Building Energy-Saving Technology

With the improvement of people's living standard, the building energy consumption is increasing day by day. In order to reduce energy consumption, we should develop energy-saving building and analyze building energy saving technology. This article mainly introduces three kinds of energy saving technology which include the external wall thermal insulation technology, doors and Windows energy saving technology and roof insulation technology.

Study on Preparation of Sintered Thermal Insulation Wall Material by High Addition Fly Ash

Production process of sintered thermal insulation wall material with high content fly ash was investigated in this paper. The proper addition amount of fly ash, the types and addition amount of the binders, the demand of molding and the molding process as well as the schedule of sintering was determined. The results show that: When the addition amount of fly ash is 65wt.%, the plasticity index of mixture mad is still more than 8. The compressive strength of the sintered sample can reach 12MPa; the porosity is in the range of 40-50%; Bulk density is 1.45g/cm3. If the macro porosity of the industrial product is designed as 40%, the final bulk density can reach 1.40g/cm3, and the theoretical thermal conductivity is less than 0.88w/(m2•K). This product can meSuperscript textet the demand of building energy saving and replace traditional external wall thermal insulation materials.

Study on Fuzzy Comprehensive Evaluation of External Wall Thermal Insulation and Energy-Saving Technology

The current evaluation process of architecture external wall thermal insulation energy-saving has met the problems such as information incompleteness and fuzziness. In order to solve the problems, the fuzzy comprehensive evaluation method is used, and the external wall thermal insulation energy-saving technique evaluation index system is set. And the method is adopt to compare between the walls using and not using the technology. The result shows that the evaluation of the external wall using thermal insulation energy-saving technique is obviously better than the result of the external wall not using the technique, so the thermal insulation energy-saving material should be promoted and applied nation-widely.

Quality Control of EPS External Wall Thermal Insulation System

To ensure the construction quality of EPS external wall thermal insulation system , need to controll raw materials, construction conditions, construction methods and quality control acceptance criteria and other aspects

Steady state theoretical model of fired clay hollow bricks for enhanced external wall thermal insulation

This paper proposes a theoretical model to study the steady state thermal behavior of fired clay hollow bricks for enhanced external wall thermal insulation. The study aims at the development of new materials and structural components with good thermal material properties, with respect to energy saving and ecological design. Thermal insulation capacity of two external walls of different thicknesses, constructed of locally produced bricks, is studied. The basic brick units used for the investigation are small-size bricks with eight equal cavities or recesses and big-size bricks with twelve equal recesses. Their recesses configuration has been varied to perform the assessment. The insulation materials injected within brick recesses during the assessment are granulated cork and expanded polystyrene. The improvement in the thermal performance of the walls will be the result of optimization among the various factors such as brick cavity configurations, integration of insulation within brick recesses and the cavity surface emissivities. So emphasis is given to the study of the impact of these factors singly or in combination on the overall thermal resistance of walls in order to find out the best design solutions to maximize their thermal insulation capacity. Computer modeling and calculations performed, for steady state conditions, show that the increase in hollow brick cavity height contributes to the improvement of the overall thermal resistance of the order of 18–20%. The improvement could significantly increase to the range of 88.64% and 93.33%, if the bricks used are injected with the insulating material. If the cavity surface emissivities are lowered to 0.3, the improvement will be 72.73–78.33%. The results have also shown that replacing the cork by expanded polystyrene (EPS), having lower thermal conductivity, would not improve significantly the overall thermal resistance. This improvement is 9.08% for a wall of small-size bricks having configuration BS2CV and 8.34% for a wall of big-size bricks having configuration BB3CV.

Thermal and Mechanical Properties of Cellular Polystyrene and Polyurethane Insulation Materials Aged on a Flat Roof in Hot-Dry Climate

Abstract Cellular polymers, which have been increasingly used for thermal insulation of external walls and roofs since the 1970s, degrade in some cases. The heat transmission of a cellular polymer insulator, the k value, is predominantly dependent on the heat conduction of the air or gas remaining in the cells. An insulator may be aged and start transmitting more energy due to replacement of cell content with different gases or moisture or both, changes in size, softening and creeping under pressure and heat, or penetration of water or mineral particles into cells, or a combination thereof. The solid face also degrades due to ultraviolet light, heat and atmospheric oxygen. A research project was carried out from January 1988 to December 1991 to investigate the performance of flat roofs, waterproofing, and thermal insulation materials in the hot-dry climatic region of Saudi Arabia. In this context a field station was built and operated for weathering of roofing and insulation materials and for monitoring the surface and the inner temperatures of the applied roof systems. Basically, two types of cellular polymers, expanded polystyrene and foamed polyurethane, were installed on the roof of the station for insulation. Specimens taken from the fresh, stored, and weathered polystyrene and polyurethane foams were tested to evaluate them according to the selected properties of thermal conductivity, compressive strength at relative deformation, and dimensional stability at elevated temperature. The test results were compared with the requirements presented in the literature and the standard specifications.

The effect of wall linings on the sound insulation between dwellings

Wall linings are often used in dwellings to improve the thermal insulation of external walls and also to provide a dry finish. These linings are usually made from plasterboard, and some types are composites, having a thermal insulating material such as foamed plastic or mineral fibre bonded to the plasterboard. Wall linings can affect sound insulation, and experiments have been conducted to compare the effect of different types of lining and different fixing methods. The main conclusions are that composite linings should be mounted on spacers, rather than flat against the wall, and that plasterboard/mineral fibre types can provide a reasonably simple way of improving sound insulation.

A description of the “engulf” computer codes - codes to model the thermal response of an LPG tank either fully or partially engulfed by fire

Simple computer codes have been developed at the Safety and Reliability Directorate to model the thermal and pressure response of LPG tanks involved in fire engulfment accidents. The present code, ENGULF II, can model either total or partial fire engulfment of an LPG tank, including jet flame impingement. Other features available within the code are safety relief vent valves, bulk boiling of the liquid contents, external tank wall thermal insulation, water spray cooling, tank failure prediction and the modeling of a gas or petrol filled tank. Code predictions have been in good agreement with available experimental data.

A description of the “ENGULF” computer codes - codes to model the thermal response of an LPG tank either fully or partially engulfed by fire

Simple computer codes have been developed at the Safety and Reliability Directorate to model the thermal and pressure response of LPG tanks involved in fire engulfment accidents. The present code, ENGULF II, can model either total or partial fire engulfment of an LPG tank, including jet flame impingement. Other features available within the code are safety relief vent valves, bulk boiling of the liquid contents, external tank wall thermal insulation, water spray cooling, tank failure prediction and the modeling of a gas or petrol filled tank. Code predictions have been in good agreement with available experimental data.