scholarly journals Design and Verification of a Deep Rock Corer with Retaining the In Situ Temperature

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Zhiqiang He ◽  
Heping Xie ◽  
Mingzhong Gao ◽  
Ling Chen ◽  
Bo Yu ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Heat Dissipation ◽  
Electric Heating ◽  
Transfer Model ◽  
Hollow Glass Microsphere ◽  
Insulation Material ◽  
Insulation System ◽  
Deep Rock ◽  
Active Thermal Insulation

Deep rock is always under high-temperature conditions. However, traditional coring methods generally have no thermal insulation design, which introduces large deviations in the guidance required for resource mining. Thus, a thermal insulation design that utilizes active and passive thermal insulation was proposed for deep rock corers. The rationale behind the active thermal insulation scheme was to maintain the in situ core temperature through electric heating that was controlled by using a proportional-integral-derivative (PID) chip. Graphene heating material could be used as a heating material for active thermal insulation through testing. In regard to the passive thermal insulation scheme, we conducted insulation and microscopic and insulation effectiveness tests for hollow glass microsphere (HGM) composites and SiO2 aerogels. Results showed that the #1 HGM composite (C1) had an excellent thermal insulation performance (3 mm thick C1 can insulate to 82.6°C), high reflectivity (90.02%), and wide applicability. Therefore, C1 could be used as a passive insulation material in deep rock corers. Moreover, a heat transfer model that considered multiple heat dissipation surfaces was established, which can provide theoretical guidance for engineering applications. Finally, a verification test of the integrated active and passive thermal insulation system (graphene heating material and C1) was carried out. Results showed that the insulating effect could be increased by 13.3%; thus, the feasibility of the integrated thermal insulation system was verified. The abovementioned design scheme and test results provide research basis and guidance for the development of thermally insulated deep rock coring equipment.

Progress on Vacuum Insulation Panels in Building Application

2012 ◽  
Vol 178-181 ◽  
pp. 46-50
Author(s):  
Wang Ping Wu ◽  
Zhou Chen ◽  
Cheng Dong Li ◽  
Teng Zhou Xu ◽  
Jin Lian Qiu ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Thermal Insulation ◽  
Surface Damage ◽  
Core Material ◽  
Insulation Material ◽  
Insulation System ◽  
Vacuum Insulation ◽  
Insulation Thickness ◽  
New Material ◽  
Barrier Film

The insulation material VIP in building offers a new material for highly insulated constructions with just a fraction of the required insulation thickness compared to conventional thermal insulation materials. A VIP is basically composed of the core material, the barrier film and getters. Core materials of VIP are glass fiber, fumed silica, fiber-powder composite core. The barrier film covered by glass fiber textile is the protection of the envelope against surface damage and fire attack. We introduce the VIP elements, the system of VIPs in building application and external thermal insulation system with VIP.

scholarly journals Polystyrene Waste in Panels for Thermal Retrofitting of Historical Buildings: Experimental Study

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1844
Author(s):  
Bożena Orlik-Kożdoń
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Resistance Coefficient ◽  
Diffusion Resistance ◽  
Insulation Material ◽  
In Situ Tests ◽  
Historical Building ◽  
Technical Parameters ◽  
Cellular Concrete

The following article presents comprehensive research results for the insulation material based on polystyrene wastes. The presented product has the form of plates to be applied for thermal insulation of external envelopes from the inside. The laboratory tests were focused on the determination of basic technical parameters for this type of materials, i.e., thermal conductivity coefficient, diffusion resistance coefficient, reaction to fire, material sorption, and strength characteristics. For the recycling material, the obtained thermal conductivity value was 0.055 [W/mK]. The diffusion resistance coefficient was 5 [–], and therefore, this component has been qualified to a group of solutions that allow for interstitial condensation in the envelope. For the developed product, in situ tests were carried out on the actual wall system in a historical building. Based on the research, temperature and humidity profiles were obtained in the selected planes of the envelope. The performance of this material in real conditions was observed in relation to the reference product, i.e., lightweight cellular concrete (commonly used as thermal insulation from the inside). For the conducted in situ research, statistical inference was applied, which included the verification of the hypothesis-recycling panels in wall systems follow a trend of changes similar to that of slabs made of lightweight cellular concrete (a group of materials that allows for interstitial condensation). The proposed method of using secondary raw materials in insulation products allows us to obtain a product with high technical parameters that do not differ in quality from new components.

Study on Fire Safety of Building External Thermal Insulation Materials

2014 ◽  
Vol 989-994 ◽  
pp. 5431-5434 ◽  
Author(s):  
Liang Yang
Keyword(s):  
Thermal Insulation ◽  
Fire Safety ◽  
Fire Hazard ◽  
Insulation Material ◽  
System Construction ◽  
Insulation System ◽  
Theoretical Support ◽  
Reliable Performance ◽  
Material Choice ◽  
Main Component

Energy-saving and emission-reducing must be achieved based on the reliable performance of fire safety. External thermal insulation material is the main component of external thermal insulation system, and also the main combustion participants when a fire occurs; the combustion performance is an important factor affecting the fire scale of external thermal insulation system. The main material and heat release principle was introduced in this paper, tests were carried out, and fire hazard was analyzed based on large amount of test data. The research will provide theoretical support for external insulation material choice, system construction, fire prevention and rescue.

Cracks on ETICS along thermal insulation joints: case study and a pathology catalogue

2016 ◽  
Vol 34 (1) ◽  
pp. 57-72 ◽  
Author(s):  
Sara Stingl de Freitas ◽  
Vasco Peixoto de Freitas
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Thermal Insulation ◽  
Expansion Coefficient ◽  
Mechanical Behaviour ◽  
Climatic Conditions ◽  
Insulation Material ◽  
Content Type

Purpose – The purpose of this paper is to present a case study of cracks on external thermal insulation composite systems (ETICS) along the thermal insulation joints and the information available on the building pathology catalogue – PATORREB. The aim is to establish the methodology to study the cause of the pathology observed on a building which is located on the interior of Portugal based on in situ probing together with the analysis of hygrothermal and mechanical behaviour. Design/methodology/approach – An in situ analysis was performed to assess the causes. The hygrothermal dynamic behaviour of the wall was analysed with a numerical simulation advanced tool considering the climatic conditions, the characteristics of the thermal insulation plates as well as the support and finishing layer properties. Moreover, a qualitatively analysis of the mechanical behaviour, based on the bonding process, thermal insulation and exterior rendering properties was performed. Findings – It was concluded that the insulation properties – thermal expansion coefficient and stiffness, the thermal expansion coefficient of the exterior rendering, together with adverse climatic conditions were critical for the appearance of cracks along the plate joints, particularly with spot bonding. The expansion and retraction stresses and the restrained movements of the components can result in bending moments, especially when the insulation material has a high stiffness value, which will create the crack on the rendering system. Originality/value – A combination between a hygrothermal and mechanical analysis of an ETICS pathology concerning the appearance of cracks with a subsequent integration into a building pathology catalogue.

scholarly journals Experimental and Numerical Study on the Heat Transfer Characteristics of a Newly-Developed Solar Active Thermal Insulation System

Buildings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 123
Author(s):  
Peter Steininger ◽  
Matthias Gaderer ◽  
Oliver Steffens ◽  
Belal Dawoud
Keyword(s):  
Solar Energy ◽  
Thermal Insulation ◽  
Numerical Study ◽  
Incidence Angle ◽  
Incident Radiation ◽  
Short Wave ◽  
Wave Radiation ◽  
Insulation System ◽  
Active Thermal Insulation ◽  
Irradiation Angle

A newly-developed solar active thermal insulation system (SATIS) is introduced with the main objective to accomplish a highly-dependent total solar transmittance on the irradiation angle. SATIS is also designed to obtain the maximum transmittance at a prescribed design irradiation angle and to reduce it remarkably at higher irradiation angles. A purely mineral thermal insulation plaster with micro hollow glass spheres is applied to manufacture the investigated SATIS prototype. Light-conducting elements (LCEs) have been introduced into SATIS and suitable closing elements have been applied. The SATIS prototype has been investigated both experimentally and numerically. It turned out that the contributions of conduction, radiation and convection to the effective thermal conductivity of SATIS, without the closing elements (49 mWmK), amount to 86.2%, 13.2% and 0.6%, respectively. The angle-dependent short-wave radiation exchange within the LCE has been investigated via ray tracing. At the incidence angle of 19% (design angle), 27% of the radiation within the LCE is absorbed by the absorber plate, resulting in measured and computed total solar energy transmittances of 11.2%/11.7%, respectively. For a typical summer irradiation angle of 60%, 98% of the incident radiation is absorbed by the surfaces at the entrance of the LCE. The corresponding total solar energy transmittance amounts to 2.9%.

scholarly journals IN-SITU TESTS OF COUNTERMEASURE TECHNIQUE USING GEOCELL AND THERMAL INSULATION MATERIAL FOR THE FROST HEAVE ON CUT SLOPES

2015 ◽  
Vol 30 (0) ◽  
pp. 163-170
Author(s):  
Yutaka HASHIZUME ◽  
Naoki OYAMA ◽  
Toshio HAMANAKA ◽  
Daigo ISHII ◽  
Kenji KANEKO ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Frost Heave ◽  
Insulation Material ◽  
In Situ Tests ◽  
Thermal Insulation Material ◽  
Cut Slopes

Concrete Exterior Wall Insulation without Network System

2013 ◽  
Vol 724-725 ◽  
pp. 1495-1499 ◽  
Author(s):  
Shu Hua Wei ◽  
Xiao Jun Wang
Keyword(s):  
Energy Saving ◽  
Thermal Insulation ◽  
Network System ◽  
Exterior Wall ◽  
Existing Buildings ◽  
System Technology ◽  
Insulation System ◽  
High Rise ◽  
New Buildings

External thermal insulation system of Cast-in-situ concrete exterior wall in high-rise civil building includes with network and without network system, wherein the cast-in-place concrete exterior wall insulation without network system is the most economical and the external thermal insulation system. This system applies to new buildings, can also be applied to energy saving renovation of existing buildings. In this paper, the system technology without steelmesh is synthetically introduced so that more engineers can know and use it better.

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

2013 ◽  
Vol 671-674 ◽  
pp. 1791-1795
Author(s):  
Qian Gu ◽  
Sheng Ren ◽  
Yue Wang ◽  
Hao Luo
Keyword(s):  
Thermal Insulation ◽  
Thermal Performance ◽  
Insulation Material ◽  
Cold Winter ◽  
Insulation System ◽  
External Wall ◽  
Finite Element Software ◽  
Building Walls ◽  
Insulation Performance ◽  
The Heat Transfer Coefficient

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.

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