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Device and method for measuring humidity physical properties of porous materials

A technology of porous materials and measuring devices, applied in measuring devices, analysis of suspensions and porous materials, analysis of materials, etc., can solve problems such as reducing indoor air quality, moisture condensation on wall surfaces, and shortening the service life of building components

Pending Publication Date: 2017-09-05
CHINA JILIANG UNIV
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Problems solved by technology

In the enclosure structure, excessive moisture content will cause moisture condensation and mold growth on the wall surface, shorten the service life of building components, increase the energy consumption of indoor air conditioning systems, reduce indoor air quality, etc.

Method used

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  • Device and method for measuring humidity physical properties of porous materials
  • Device and method for measuring humidity physical properties of porous materials
  • Device and method for measuring humidity physical properties of porous materials

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Embodiment Construction

[0020] The invention can complete the measurement of the water vapor effective diffusion coefficient and isothermal moisture absorption curve of the porous material sample. The measurement principle is as follows:

[0021] Based on the physical model of water vapor transient one-dimensional diffusion, such as figure 1 , the initial water vapor density inside the sample is consistent and a constant value ρ 0 . When the experiment starts, the ambient water vapor density on the boundary of one end of the sample (x=0) suddenly increases and will remain at ρ 1 (>ρ 0 ), while the ambient water vapor density on the boundary of the other end of the sample is always kept as ρ 0 . Afterwards, driven by this water vapor density difference, the moisture will conduct one-dimensional conduction along the positive direction of the x-axis inside the sample. The relative humidity distribution inside the sample at a certain time will be as figure 1 shown by the dotted line. The relation...

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Abstract

The invention discloses a device and a method for measuring humidity physical properties of porous materials. The device comprises a high-humidity test cabinet, a low-humidity test cabinet, a saturation system, a temperature control system and a data acquisition system. The device and the method have the advantages that the problems of deterioration of the heat-insulation performance of existing porous materials and diversified adverse effects due to accumulation of moisture in service procedures can be solved by the aid of the device and the method; the device for measuring the humidity physical properties of the porous materials comprises a system for testing water vapor effective diffusion coefficients and isothermal moisture absorption curves of the porous materials under the conditions of different temperatures and different types of relative humidity, accordingly, the water vapor effective diffusion coefficients and the isothermal moisture absorption curves of the porous materials under the conditions of the different temperatures and the different types of relative humidity can be obtained, the humidity physical properties and heat and moisture coupled transfer conditions of the porous materials can be comprehended, service conditions of the porous materials under different working conditions can be ultimately estimated, the service lives of the materials can be predicted, and unfavorable effects due to excessively high humidity can be prevented.

Description

technical field [0001] The invention belongs to the field of measuring wet physical properties of materials, and in particular relates to a device for measuring wet physical properties of porous materials and a measuring method thereof. Background technique [0002] The heat transfer and mass transfer of porous materials have an important impact on people's daily life and social production. Food processing, energy power, chemical production, biotechnology, energy conservation and other fields are all related to it. Therefore, the heat and mass transfer issues of porous materials have been highly valued for a long time. [0003] In the field of heat and mass transfer, the research on heat transfer has been relatively thorough. In addition to various measurement tools for measuring the thermal physical properties of materials, a relatively comprehensive database of thermal physical properties of materials has also been established. However, due to the limitation of technical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/08G01N15/082G01N2015/0866
Inventor 徐旭王友辉张杰周林杰
Owner CHINA JILIANG UNIV
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