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Thermal performance analysis of building construction with insulated walls in summer days and nights

建筑结构保温墙体夏季昼夜热性能分析

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Abstract

In the present study, the insulation mechanism of building walls during the summer days and nights is investigated with a realistic approach to enhance their performance. A fiber layer, as a porous medium with air gaps, is used along the wall layers to decrease the energy loss. Meanwhile, the radiation heat flux variation during five days in a row has been considered for each side of the building, and it is tried to reach the optimum values for geometrical factors and find suitable insulation for each side of the building. A lattice Boltzmann method (LBM) based code is developed to simulate the actual chain of the heat transfer which consists of radiation, conduction, forced and natural convection combination within wall layers including fiber porous insulation. The results indicate that for the current insulation model, the effect of natural convection on the heat transfer is not negligible and the existence of the porous layer has caused a positive impact on the heat loss reduction by decreasing the circulation speed. Also, by using the optimum location and thickness for the insulation layer, it is showed that each side of the building has different rates of energy loss during a day, and for the appropriate insulation, they need to be evaluated separately.

摘要

对建筑墙体在夏季日夜的隔热机理进行了研究, 并提出了一种切实可行的方法来提高其性能。 沿壁层使用一种具有多孔结构的纤维层以减少能量损失。同时监测建筑各面连续5 d 的辐射热流变化, 以找到最佳的结构和合适的隔热层。建立了基于格子玻尔兹曼方法(LBM)的数值模拟程序, 模拟了含 纤维多孔保温材料的壁面内辐射、传导、强制对流和自然对流组合的实际传热链。结果表明:对于目 前的绝热模型, 自然对流在传热中的作用不可忽略, 多孔层的可降低循环速度和热损失。此外, 建筑 的各面在一天中的能量损失率也不同, 需要分别进行评估以确定合适的保温层。

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Abbreviations

c :

Lattice speed

c s :

Sound speed

c p :

Specific heat at constant pressure

Da :

Darcy number

F :

Body forces

f :

Particle distribution function

f eq :

Equilibrium particle distribution function

g :

Energy distribution function

g eq :

Equilibrium energy distribution function

h :

Convective heat transfer coefficient

H :

Characteristic length in the y-direction

k :

Thermal conductivity

K :

Permeability

L :

Characteristic length in x-direction

M :

Transform matrix

Nu :

Average Nusselt number

\(\overline {Nu} \) :

Local Nusselt number

P :

Pressure

Pr :

Prandtl number

Gr :

Grashof number

T :

Temperature

U :

X-direction velocity

V :

Y-direction velocity

X, Y :

Cartesian coordinates

α :

Thermal diffusivity

β :

Thermal expansion coefficient

μ :

Dynamic viscosity

ν :

Kinematic viscosity

ρ :

Density

ω :

Weighting factor

ε :

Porosity

c:

Convection

e:

Emissivity

f:

Fluid-phase

α :

Lattice direction

s:

Solid-phase

env:

Environment

amb:

Ambient

i:

Indoor

o:

Outdoor

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Authors and Affiliations

  1. College of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an, 710055, China

    Ya-bin Chen  (陈雅斌) & Xing-wang Pei  (裴兴旺)

  2. Xi’ an City Developments Engineering Quantity Examination Center, Xi’an, 710000, China

    Bing-zheng Han  (韩兵正)

Authors
  1. Ya-bin Chen  (陈雅斌)
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  2. Xing-wang Pei  (裴兴旺)
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  3. Bing-zheng Han  (韩兵正)
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Contributions

CHEN Ya-bin conducted simulations and provided the results, PEI Xing-wang provided the concept and wrote the first draft of paper, HAN Bing-zheng edited the draft ofmanuscript.

Corresponding author

Correspondence to Xing-wang Pei  (裴兴旺).

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Conflict of interest

CHEN Ya-bin, PEI Xing-wang, HAN Bing-zheng declare that they have no conflict of interest.

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Chen, Yb., Pei, Xw. & Han, Bz. Thermal performance analysis of building construction with insulated walls in summer days and nights. J. Cent. South Univ. 28, 3613–3625 (2021). https://doi.org/10.1007/s11771-021-4879-3

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