Dimensionless resolutions for heat flux decrement factor and time lag of the wall during cyclic variations in outdoor air temperature
The heat flux decrement factor (DF) and time lag (TL) are two vital indicators for assessing wall dynamic thermal performance. However, computing these indicators involves complex variables such as material thermal properties, wall thickness, and others. Therefore, exploring the inherent relation be...
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| Published in | Case studies in thermal engineering Vol. 60; p. 104678 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
01.08.2024
Elsevier |
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| Abstract | The heat flux decrement factor (DF) and time lag (TL) are two vital indicators for assessing wall dynamic thermal performance. However, computing these indicators involves complex variables such as material thermal properties, wall thickness, and others. Therefore, exploring the inherent relation between these two indicators and the influencing parameters is an urgent problem for reducing building energy consumption. To this end, an analytical method based on the auxiliary function was employed to calculate the heat flux DF and TL of a single-layer wall. Then, the impact of the influencing factors on heat flux DF and TL were evaluated. The results showed that heat flux DF and TL are only determined by two dimensionless parameters: diffusion length and thermal efficiency coefficient. The heat flux DF decreases by at least 5 times as the diffusion length varies from 0 to 2. Besides, it is also affected by the diffusion length when the thermal efficiency coefficient (ε) is less than 5, and the smaller the ε, the smaller the heat flux DF. On the other hand, the heat flux TL increases linearly with the diffusion length initially but declines precipitously as the diffusion length approaches 6–7. When the diffusion length is the same, the heat flux TL slightly decreases as the thermal efficiency coefficient increases. |
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| AbstractList | The heat flux decrement factor (DF) and time lag (TL) are two vital indicators for assessing wall dynamic thermal performance. However, computing these indicators involves complex variables such as material thermal properties, wall thickness, and others. Therefore, exploring the inherent relation between these two indicators and the influencing parameters is an urgent problem for reducing building energy consumption. To this end, an analytical method based on the auxiliary function was employed to calculate the heat flux DF and TL of a single-layer wall. Then, the impact of the influencing factors on heat flux DF and TL were evaluated. The results showed that heat flux DF and TL are only determined by two dimensionless parameters: diffusion length and thermal efficiency coefficient. The heat flux DF decreases by at least 5 times as the diffusion length varies from 0 to 2. Besides, it is also affected by the diffusion length when the thermal efficiency coefficient (ε) is less than 5, and the smaller the ε, the smaller the heat flux DF. On the other hand, the heat flux TL increases linearly with the diffusion length initially but declines precipitously as the diffusion length approaches 6–7. When the diffusion length is the same, the heat flux TL slightly decreases as the thermal efficiency coefficient increases. |
| ArticleNumber | 104678 |
| Author | Lu, Yihang Yang, Ru He, Jiajian Wang, Liang Yuan, Liting |
| Author_xml | – sequence: 1 givenname: Yihang orcidid: 0000-0002-0815-2944 surname: Lu fullname: Lu, Yihang organization: The College of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, 310018, China – sequence: 2 givenname: Liang surname: Wang fullname: Wang, Liang organization: Nuclear Industry Engineering Research and Design Co., Ltd., Shunyi, Beijing, 101300, China – sequence: 3 givenname: Jiajian surname: He fullname: He, Jiajian organization: School of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China – sequence: 4 givenname: Ru surname: Yang fullname: Yang, Ru organization: The College of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, 310018, China – sequence: 5 givenname: Liting surname: Yuan fullname: Yuan, Liting email: ylting@zstu.edu.cn organization: School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou, 310018, China |
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| Keywords | Analytical approach Heat flux decrement factor Dimensionless numbers Heat flux time lag Dynamic thermal performance |
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| Title | Dimensionless resolutions for heat flux decrement factor and time lag of the wall during cyclic variations in outdoor air temperature |
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