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Experimental device for testing heat conductivity coefficient of building material based on quasi steady state and unsteady state methods

An experimental device and building material technology, applied in the direction of material thermal development, etc., can solve the problems of not being able to carry the quasi-steady-state measurement process at the same time, large relative error, long test time, etc., to shorten test preparation time and reduce measurement error , Conducive to the effect of comparison and verification

Active Publication Date: 2013-09-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention solves the problem that the existing thermophysical parameter experimental device cannot carry the three measurement processes of the quasi-steady state method, the constant power method and the thermal pulse method at the same time; and there is a longer test time and a smaller maximum relative error of measurement. and other problems, and then provides an experimental device based on the quasi-unsteady method to test the thermal conductivity of building materials

Method used

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  • Experimental device for testing heat conductivity coefficient of building material based on quasi steady state and unsteady state methods
  • Experimental device for testing heat conductivity coefficient of building material based on quasi steady state and unsteady state methods
  • Experimental device for testing heat conductivity coefficient of building material based on quasi steady state and unsteady state methods

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specific Embodiment approach 1

[0009] Embodiment 1: The experimental device for testing the thermal conductivity of building materials based on the quasi-unsteady method described in this embodiment includes an AC regulated power supply 1, a transistor DC regulated power supply 2, a standard resistor 3, at least one heating resistor 4, Low potential potentiometer 5, oil-immersed keyboard switch 6, ice bottle 7 for holding ice-water mixture, first thermocouple 8 (temperature sensing element), second thermocouple 9; AC stabilized power supply 1 and transistor The DC regulated power supply 2 is connected in series with two poles, the positive and negative electrodes of the transistor DC regulated power supply 2 are connected with the electrical connection terminal of at least one heating resistor 4, and the positive electrode of the transistor DC regulated power supply 2 is connected with the current of at least one heating resistor 4. A standard resistance 3 is connected between the input ends; the positive an...

specific Embodiment approach 2

[0010] Specific implementation two: as Figure 4 As shown, the number of heating resistors 4 in the experimental device described in this embodiment is two, and the two heating resistors 4 are connected in parallel on the transistor DC stabilized power supply 2 and the two are arranged in parallel up and down, and the experimental device also includes a plurality of experimental devices. 10 and two thermal insulation layers 11, a plurality of test pieces 10 are composed of a first test piece A1, a second test piece A2, a third test piece A3 and a fourth test piece A4 arranged from top to bottom with the same thickness. The second specimen A2 and the third specimen A3 are located between the two heating resistors 4, the first specimen A1 is placed on the upper heating resistor 4, and the fourth specimen A1 is placed under the lower heating resistor 4 , the first test piece A1, the second test piece A2, the third test piece A3 and the fourth test piece A4 arranged from bottom to...

specific Embodiment approach 3

[0011] Specific implementation three: as Image 6 As shown, the number of heating resistors 4 in the experimental device of this embodiment is one, and the experimental device also includes a plurality of test pieces 10, and the plurality of test pieces 10 are arranged from top to bottom. A test piece I and a third test piece III are composed, the first test piece I is located above the heating resistor 4, and the measurement end of the first thermocouple 8 and the measurement end of the second thermocouple 9 are respectively located on the upper and lower sides of the first test piece I On both sides, the thickness of the second test piece II and the third test piece III is greater than the thickness of the first test piece I. Other components and connection relationships are the same as in the first embodiment.

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Abstract

The invention provides an experimental device for testing a heat conductivity coefficient of a building material based on quasi steady state and unsteady state methods, relates to the field of a testing technology of thermophysical parameters of a building material, and solves the problems that an existing thermophysical parameter experimental device can not simultaneously load the measurement processes by using three methods including a quasi steady state method, a normal power method and a heat pulse method, and one-time testing time is long and a measurement maximum relative error is large. An anode and a cathode of a low-potential potentiometer are correspondingly connected with a switch control interface of an oil immersed key conversion switch; thermoelectromotive force signals output by thermocouples are respectively connected into a thermoelectromotive force signal output end of the oil immersed key conversion switch; cold ends of the thermocouples are respectively inserted into an ice bottle containing an ice-water mixture; measuring ends of the thermocouples are respectively contacted with a testing piece to be tested; a heating resistor is used for heating the testing piece to be tested. The theoretical error analysis and the actual measurement prove that the measurement maximum relative errors are as follows: the heat conductivity coefficient is less than or equal to 5.1%, the thermal diffusivity is less than or equal to 9.2% and the specific heat value is less than or equal to 7.7%; the requirement on precision by engineering is met.

Description

technical field [0001] The invention relates to an experimental device for testing the thermal conductivity of building materials based on a quasi-unsteady-state method, and relates to the technical field of testing thermal physical property parameters of building materials. Background technique [0002] Thermal conductivity, thermal conductivity and specific heat are important thermophysical parameters of materials. The experimental device provided in the prior art cannot simultaneously carry the three measurement processes of the quasi-steady-state method, the constant-power method, and the thermal pulse method (the constant-power method and the thermal pulse method are collectively referred to as the non-steady-state method), which is not conducive to the measurement results. Comparison check. The existing experimental device also has a long test time and a large maximum relative error of measurement, which cannot meet the engineering requirements for accuracy. Therefor...

Claims

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Application Information

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IPC IPC(8): G01N25/20
Inventor 孙澄张斌韩昀松邢凯梁静
Owner HARBIN INST OF TECH
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