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Computing method for building-material heat conductivity coefficient

A technology for thermal conductivity calculation and building materials, which is applied in calculation, complex mathematical operations, electrical digital data processing, etc.

Active Publication Date: 2018-05-08
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
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Problems solved by technology

Most of the current research on moisture transfer in buildings focuses on the analysis of the impact of moisture transfer on the heat transfer of building envelopes and building loads, but there are few reports on how moisture transfer affects the thermal conductivity of materials and how to quantitatively analyze it

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  • Computing method for building-material heat conductivity coefficient
  • Computing method for building-material heat conductivity coefficient
  • Computing method for building-material heat conductivity coefficient

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Embodiment Construction

[0052] Through the analysis of the heat-moisture coupling transfer mechanism of porous building materials, with the water vapor partial pressure gradient and temperature gradient as the driving potential, the heat-moisture coupling transfer control equation of the no-humidity phase transition is established; and the transfer coefficient expression reflecting the moisture-heat interaction is given . Based on the heat-moisture coupling transfer control equation without moisture phase change, the two terms of phase change moisture source and heat source are introduced, combined with the theory of evaporation and condensation, the heat-moisture coupling transfer control equation with moisture phase change is established. According to the interaction between the internal moisture phase transition and the temperature and humidity field of porous building materials, a cyclic iterative calculation method for additional heat conduction is proposed to calculate the additional thermal con...

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Abstract

The invention discloses a computing method for the building-material heat conductivity coefficient. According to the computing method, porous building materials are subjected to heat and moisture coupling transfer mechanism analysis, the vapor partial pressure gradient and the temperature gradient serve as driving potential, and a moisture-free-phase-change heat and moisture coupling transfer control equation is established; a transfer coefficient expression for reflecting moisture-heat interaction is given. Based on the moisture-free-phase-change heat and moisture coupling transfer control equation, a phase-change moisture source and a heat source are introduced in cooperation with the evaporation condensation theory, and a moisture-phase-change heat and moisture coupling transfer controlequation is established. According to the mutual influence effect between moisture phase changes and temperature and moisture fields inside the porous building materials, a heat-conduction-additionalloop iteration computing method is provided, and the heat conductivity coefficient caused by moisture transfer and moisture phase changes is obtained after computing.

Description

technical field [0001] The invention relates to the field of heat and moisture transfer of building materials, in particular to a method for calculating the thermal conductivity of building materials. Background technique [0002] The thermal conductivity of building materials is one of the important thermal parameters in the calculation of building cooling and heating loads and energy consumption. Most of the porous building materials used in practice have a certain moisture content, and the heat transfer performance of the material will change when the material is wet. However, in the current calculation methods and software of building cooling and heating loads, the physical properties of materials are often approximately considered to be constant, and the influence of moisture changes on the heat conduction process of materials is ignored, resulting in errors in the calculation of heat transfer. Therefore, it is of great significance to study the quantitative change rel...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F17/12G06F17/13
CPCG06F17/12G06F17/13G06F30/20
Inventor 王莹莹马超姜超刘艳峰王登甲
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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