Study of Xonotlite Architectural Coatings for Exterior Wall Insulation Mechanism

2014 ◽  
Vol 809-810 ◽  
pp. 672-675 ◽  
Author(s):  
Li Liu ◽  
Yi Yue ◽  
Jian Xin Cao
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Thermal Radiation ◽  
Thermal Insulation ◽  
Thermal Convection ◽  
Hydrothermal Reaction ◽  
Exterior Wall ◽  
Acrylic Emulsion ◽  
Compound Type ◽  
Architectural Coatings

Thermal insulation exterior wall coating has been successfully prepared, using styrene-acrylic emulsion as film former, and xonotlite as heat-insulating filler, which produced by hydrothermal reaction. The insulation mechanism of xonotlite is explored, through analyzing the microstructure of homemade xonotlite thermal insulation exterior wall coating. The results show that xonotlite is a kind of compound type heat-insulating filler that can effectively weakened the heat transfer in the coating, like heat conduction, thermal convection and thermal radiation.

2-D Transient Radiative Heat Transfer Analysis on the Slab in a Walking-Beam-Type Reheating Furnace

2014 ◽  
Vol 610 ◽  
pp. 993-997 ◽  
Author(s):  
Jun Bo Huang ◽  
Jiin Yuh Jang ◽  
Chien Nan Lin ◽  
Chao Hua Wang
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Thermal Radiation ◽  
Transient Heat Conduction ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Gas Temperature ◽  
Reheating Furnace ◽  
Hot Gas ◽  
Beam Type

A two-dimensional mathematical heat transfer model for the prediction of temperature distribution within the slab has been developed by considering the thermal radiation in the walking-beam-type reheating furnace chamber and transient heat conduction in the slab, respectively. The steel slabs are heated up through the preheating, heating, and soaking zones in the furnace. Heat transfer characteristics and temperature uniformity of the slab is investigated by changing hot gas temperature. Comparison with the in-situ experimental data show that the present heat transfer model works well for the prediction of thermal behavior of the slab in the reheating furnace. The skid mark severity decreases with an increase in hot gas temperature. Keywords: Reheating Furnace, Thermal Radiation, Transient heat conduction

Natural Convective Heat Transfer on an Unheated Vertical Plate Attached to an Upstream Isothermal Plate

1983 ◽  
Vol 105 (4) ◽  
pp. 759-766 ◽  
Author(s):  
K. Kishinami ◽  
N. Seki
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Thermal Radiation ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Plate Thickness ◽  
Thermal Conductivity Ratio ◽  
Governing Equations ◽  
Difference Form ◽  
The Common

A numerical and experimental investigation on natural convective heat transfer with the coupling of heat conduction and thermal radiation from a vertical unheated plate connected to an upstream isothermal plate is carried out. The governing equations for conduction in the unheated plate and for convection in the boundary layer are written in finite difference form and are analyzed numerically by using an iterative technique coupled through the common heat flux with thermal radiation. The numerical results are discussed after comparing with the experimental results of temperature and velocity profiles and heat transfer coefficient. The coupling effects of heat conduction in the unheated plate and thermal radiation from the surface on laminar natural convective heat transfer from the plate connected to an isothermal heated upstream plate is greatly influenced by the plate-fluid thermal conductivity ratio and plate thickness, and the radiation emissivity of the plate.

Preparation and Properties of Thermal Insulation Putty for Exterior Wall Containing Sepiolite Composite Materials

2008 ◽  
Vol 58 ◽  
pp. 109-113 ◽  
Author(s):  
Fei Wang ◽  
Jin Sheng Liang ◽  
Qing Guo Tang ◽  
Yan Ding ◽  
Na Wang
Keyword(s):  
Composite Materials ◽  
Thermal Insulation ◽  
Operating Temperature ◽  
Testing Device ◽  
Exterior Wall ◽  
Heat Transmission ◽  
Acrylic Emulsion ◽  
Functional Additives ◽  
Insulation Effect

The composite materials for self-operating temperature were prepared by sepiolite and dodecanol as materials. Then thermal insulation putty for exterior wall was prepared by the sepiolite composite materials as main functional additives and acrylic emulsion as adhesive. The main properties of the putty films were studied by thermal insulation effect testing device. The results show that the putty films could arrest heat transmission effectively.

Design and Simulation of High Efficient MEMS Electrothermal Actuator

2013 ◽  
Vol 562-565 ◽  
pp. 504-508 ◽  
Author(s):  
Rong Chang Song ◽  
Gui Lei Wang ◽  
Jun Bo Wang ◽  
Yue Yue Shen ◽  
Chao Lv
Keyword(s):  
Heat Conduction ◽  
Thermal Radiation ◽  
Thermal Convection ◽  
Calculation Method ◽  
Transient Effects ◽  
Multiphysics Simulation ◽  
Electrothermal Actuator ◽  
Response Characteristics ◽  
High Efficient ◽  
Lower Voltage

The paper mainly designs an efficient MEMS electrothermal actuator, with lower voltage input but large displacement output. The calculation method of the actuator considers the convection and radiation besides heat conduction mentioned in most literatures. With the multiphysics simulation by the software Comsol of electrothermal bimorph actuator, the transient effects of thermal convection and thermal radiation on the actuator displacement and the response characteristics of an actuator with a separate heating layer were studied.

Evaluation of the Thermal Resistance of Structure with Reflective Insulation: Measurement under Non-Stationary Boundary Conditions

2014 ◽  
Vol 1041 ◽  
pp. 150-153
Author(s):  
Jiří Kalánek ◽  
Libor Šteffek ◽  
Milan Ostrý
Keyword(s):  
Heat Transfer ◽  
Boundary Conditions ◽  
Thermal Radiation ◽  
Thermal Resistance ◽  
Thermal Insulation ◽  
Experimental Measurements ◽  
International Standard ◽  
Stationary Boundary

Some manufacturers of reflective insulation products claim that their relatively thin products have the same thermal insulation properties as common insulation with much times higher thickness. This paper deals with experimental measurements of the thermal insulation properties of real structures with reflective insulation. Several experimental sequences were conducted to determine the thermal resistance of the structure. The evaluation was conducted according to the procedures specified in the international standard (ISO 9869 - 1994). Effect of products (based on the reflection of thermal radiation) on the thermal insulation properties of the structure will be determined by evaluation. This effect will be compared with the effects of common insulation (with the intention of reduce of the heat transfer by the conduction).

Fly Ash Autoclaved Aerated Concrete Self Thermal Insulation Building Envelope Energy Saving Research

2013 ◽  
Vol 448-453 ◽  
pp. 1243-1247 ◽  
Author(s):  
Li Bai ◽  
Ying Li ◽  
Shu Ming He
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Fly Ash ◽  
Transfer Coefficient ◽  
Energy Saving ◽  
Thermal Insulation ◽  
Building Envelope ◽  
Exterior Wall ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete

This article takes an actual public building in Changchun City as an example to field test the heat transfer coefficient of fly ash autoclaved aerated concrete exterior wall. By analysis the field test value, theory calculation value, and the maximum value of the design standard for energy efficiency of public building (GB50189-2005), I concluded that fly ash autoclaved aerated concrete self-thermal insulation building envelope exterior wall fully meet the energy-saving standard requirements, which does not need additional insulation material. And further as heat transfer coefficient of wall test and energy saving standard maximum heat transfer coefficient as the main parameter, I used DeST-c software simulation to calculate the building energy consumption. The simulation results showed that the heating energy consumption of fly ash autoclaved aerated concrete self-thermal insulation building envelope is 16.32% lower than the standards required value, which has the advantage of energy saving property.

Sign in / Sign up

Export Citation Format

Share Document