Rapid evaluation method for thermal performance of phase change material wall

A phase change material and thermal performance technology, applied in the field of building energy conservation, can solve the problems of convenience and economy, time cost challenges, high numerical calculation cost, and achieve the simple, widely applicable, and physical meaning of thermal performance prediction and evaluation. Effect

Inactive Publication Date: 2022-05-13
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the thermal performance of walls containing PCM can only be obtained through cumbersome numerical calculations (calculated by programming or commercial software) or high-cost laboratory and field tests. These methods are convenient and economical, Time and cost are challenged

Method used

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  • Rapid evaluation method for thermal performance of phase change material wall
  • Rapid evaluation method for thermal performance of phase change material wall
  • Rapid evaluation method for thermal performance of phase change material wall

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Experimental program
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Embodiment 1

[0112] The thermal performance orthogonal analysis and corresponding index results of the wall body combined with various factors of the present invention are shown in Table 1.

[0113] Table 1L 18 (3 7 ) orthogonal table and thermal performance calculation results

[0114]

[0115]

[0116] The technical solution of the present invention is described in detail by taking the wall body 13 in Table 1 as a specific example. The main factor level of wall 13 is A 2 B 1 C 3 D. 2 , the specific factor levels are as follows:

[0117] Factor A (level 2): ​​the phase transition temperature is lower than the center temperature of the left boundary, but higher than the temperature of the center of the right boundary;

[0118] Factor B (level 1): The total latent heat of PCM is taken as 56.22kJ;

[0119] Factor C (level 3): The thermal conductivity of the wall material is taken as 1.2W m -1 ·K -1 ;

[0120] Factor D (level 2): ​​The PCM is in the middle of the wall.

[01...

Embodiment 2

[0158] The technical solution of the present invention is described in detail by taking the wall body 11 in Table 1 as a specific embodiment 2. The main factor level of wall 11 is A 1 B 2 C 1 D. 2 , the specific factor levels are as follows:

[0159] Factor A (level 1): the phase transition temperature is equal to the center temperature of the left and right boundaries;

[0160] Factor B (level 2): ​​The total latent heat of PCM is taken as 74.60kJ;

[0161] Factor C (level 1): The thermal conductivity of the wall material is taken as 0.5W m -1 ·K -1 ;

[0162] Factor D (level 2): ​​The PCM is in the middle of the wall.

[0163] Step 1: Score Factor A

[0164] due to T PCM,m =T left,m =T right = 26°C, so factor A score S for wall 11 A = 100;

[0165] Step 2: Score Factor B

[0166] a. According to formula (8), k df =18.14351-689.67702·e -0.08032L =18.14351-689.67702·e -0.08032×74.60 =16.42;

[0167] b. According to formula (9), k tl =0.09768+0.14369L-9.3199...

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Abstract

The invention discloses a rapid evaluation method for thermal performance of a phase-change material wall body, which comprises the following steps of: establishing a set of rules on the basis of actual parameters of any phase-change wall body, and scoring main influence factors of the thermal performance of the wall body; and adding the score of each factor and the product of the weight to obtain the comprehensive score of the thermal performance of the PCM wall body. And the thermal performance level of the wall body can be judged and evaluated according to the comprehensive score. According to the method, tedious numerical calculation and high-cost experiments or field tests are avoided, the thermal performance level of any form of the PCM-containing wall is reflected in a simple manual calculation mode and a single score mode, and the method has the remarkable characteristics of simplicity, convenience, rapidness, accuracy and the like, and can be widely applied to thermal performance evaluation of the PCM-containing wall in scientific research and engineering.

Description

technical field [0001] The invention belongs to the technical field of building energy saving, and in particular relates to a phase change material wall thermal performance evaluation technology. Background technique [0002] The use of thermal insulation materials (materials with low thermal conductivity values) in building walls can effectively increase the thermal resistance of the walls to meet the requirements of the code for building energy conservation. At the same time, insulation materials also have low heat capacity, and most of them have fire safety hazards, and they cannot last the same life as the building. The current buildings adopt a large number of frame structures, and the walls of this structure are called infill walls, and most of them are hollow and lightweight walls. This makes the heat capacity of the entire wall relatively low, causing relatively large temperature and heat flow fluctuations in the inner surface temperature of the wall as the outdoor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20G06F17/15
CPCG01N25/20G06F17/15
Inventor 张源
Owner YANGZHOU UNIV
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