Thermal Nondestructive Testing of Buildings and Builded Constructions

Budadin, O. N.; Abramov, E. V.; Rodin, M. A.; Lebedev, O. V.

doi:10.1023/b:runt.0000011267.35338.64

Cited by 5 publications

(6 citation statements)

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“…But solutions of an ill-posed inverse heat conduction problem are extremely sensitive to the measurement error of thermal parameters, as a consequence of which the nonstationary models described in the literature [4][5][6][7] have limited practical applications.…”

Section: Abstract: Heat Conduction In a Flat Wall Variable Boundary mentioning

confidence: 99%

“…At such a moderate change in the thermal parameters limited by these conditions we should speak of a quasistationary process of heat conduction obeying the stationary relations (3)- (5). In this sense, they can be written for weak time dependences of temperatures and heat flows:…”

Section: Stationarity Conditionsmentioning

confidence: 99%

“…Thermal Diagnostics. The given concepts and the obtained conditions have practical applicability, since they can be used as the basis for metrological methods of thermal nondestructive testing connected with the determination of the thermal characteristics of exterior walls of buildings and other heat-insulating structures and materials [4][5][6][7]. This concerns mainly the quasi-stationary equation (16) The application of Eq.…”

Section: (27)mentioning

confidence: 99%

“…This will form the basis for developing the new quasi-stationary methodology (proposed by us in [4]) of controlling the thermal parameters of various kinds of heat-insulating structures and materials, including enclosure exterior walls and buildings [5,6], as well as objects of the aircraft and space-rocket industries [7], power engineering [8], and a number of other industries (for more details concerning the problems of thermal diagnostics see [4][5][6][7][8] and the references therein).…”

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Quasi-stationarity of thermal processes

Korshunov

2012

J Eng Phys Thermophy

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697.133With the aim of developing a new methodology of thermal investigations of heat-insulating structures and materials, the features of quasi-stationary heat conduction in a flat wall under varying ambient conditions have been considered. The quasi-stationary approximation errors and the applicability criteria of stationary relations between the thermal parameters of the medium imposing restrictions on the rate of change in boundary temperatures have been determined. The possibility of using nonstationary states and stable conditions in thermal diagnostics of exterior walls has been shown. Keywords: heat conduction in a flat wall, variable boundary conditions, stationary relations, thermal parameters, thermal diagnostics.Introduction. Questions on the stationarity and quasi-stationarity of the medium characteristics inevitably arise in analyzing any processes proceeding in it. The most striking example is provided by the transient plasma kinetics, within the framework of which a whole system of quasi-stationary criteria for internal parameters of the plasma was developed [1]; it is based on comparing the characteristic times of relaxation of these parameters as a consequence of various atomic and molecular processes. As a result, even in short-lived plasma formations, quasi-stationary states in which the time derivatives can be neglected are revealed [2,3].In the present work, a similar approach is extended to thermal processes having their own features of going to the quasi-stationary regime.Thermal processes, as opposed to elementary processes and plasma-chemical reactions, are always spatially oriented carrying heat flows in a certain direction. Therefore, they are anisotropic and nonequilibrium even in a homogeneous medium. The dependence of coordinates and boundary parameters is a specific feature of their stationarity (and quasi-stationarity) conditions, which we will consider here as applied to the one-dimensional heat-conduction problem for a flat wall with constant thermal characteristics of the material and variable boundary parameters.Our aim is to apply the concept of quasi-stationarity to the usual thermal processes, obtain analytical expressions for the conditions of quasi-stationary heat conduction and quasi-stationary approximation error, and investigate them. This will form the basis for developing the new quasi-stationary methodology (proposed by us in [4]) of controlling the thermal parameters of various kinds of heat-insulating structures and materials, including enclosure exterior walls and buildings [5,6], as well as objects of the aircraft and space-rocket industries [7], power engineering [8], and a number of other industries (for more details concerning the problems of thermal diagnostics see [4][5][6][7][8] and the references therein).The need for a quasi-stationary methodology, which arose in thermal diagnostics of objects located in the open atmosphere, is mainly due to the unattainability of long-time constancy of heat transfer because of the ever changing boundary conditions. But ...

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Section: Abstract: Heat Conduction In a Flat Wall Variable Boundary mentioning

confidence: 99%

Section: Stationarity Conditionsmentioning

confidence: 99%

Section: (27)mentioning

confidence: 99%

mentioning

confidence: 99%

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Quasi-stationarity of thermal processes

Korshunov

2012

J Eng Phys Thermophy

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“…The solution of the problems described above consists of two phases: the experimental and the theoretical ones [1]. The experimental phase runs at the considerable object.…”

Section: Introductionmentioning

confidence: 99%

Practical thermal testing of buildings

Lebedev¹,

Avramenko²,

Budadin³

2004

Proceedings of the 2004 International Conference on Quantitative InfraRed Thermography

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The general mathematical approach of the solution of inverse problem of nonstationary heat conductivity equation is given. This approach is applied for creating a method of determination of the thermalphysical parameters of an building construction using experimental data and prospective values of these parameters. Advantages of such approach are discussed. An example of successful implementations of this method for the real building structures examination in practice is given.

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Review and comparison of shearography and active thermography for nondestructive evaluation

Hung

Chen

et al. 2009

Materials Science and Engineering: R: Reports

209

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Shearography and thermography are optical techniques, both proven to be valuable tools for material nondestructive evaluation. Papers on these topics, however, are scattered and mainly appeared in optical journals. For the convenience of the materials community, this paper aims to present a comprehensive review of shearography and active thermography and their applications in nondestructive evaluation of materials. Both techniques enjoy the merits of full-field, non-contact and allowing speedy detection of material defects in metal, non-metal as well as composites materials. However, they are fundamentally different in flaw detection mechanisms. Shearography measures materials' mechanical response to stresses, whereas active thermography measures material's heat-transfer response to an instantaneous thermal excitation. A comparison of the advantages and limitations of two techniques for nondestructive evaluation will also be presented.

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Thermal Nondestructive Testing of Buildings and Builded Constructions

Cited by 5 publications

References 0 publications

Quasi-stationarity of thermal processes

Quasi-stationarity of thermal processes

Practical thermal testing of buildings

Review and comparison of shearography and active thermography for nondestructive evaluation

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