Numerical Simulation of Heat Transfer through Uniform Multilayer

Walls using ANSYS

STAN-IVAN FELICIA-ELENA, DINU RADU-CRISTIAN, DUINEA ADELAIDA-MIHAELA

Department of Department of Electrical, Energy and Aerospace Engineering,

University of Craiova,

Address Bld. Decebal, no. 107,

ROMANIA

(rooms) from the outside environment. The article aims to carry out a series of simulations on the structure of a

non-homogeneous multilayer wall using the ANSYS program. The simulations have been performed highlight

how the values vary (both numerically and graphically) for a series of characteristic parameters such as heat

fluxes, temperatures, convection coefficients. The values of the parameters obtained with the ANSYS program

were also compared with those obtained by classical numerical calculations.

Key-Words: - thermal transfer, buildings, multilayer wall, modeling, mathematical model, thermal simulation.

Received: June 11, 2023. Revised: November 13, 2023. Accepted: December 23, 2023. Published: December 31, 2023.

consumption and increase energy efficiency in the

building sector. To reduce carbon emissions,

energy-efficient buildings are one way to save

energy and reduce energy demand. Energy

consumption in buildings is becoming increasingly

important as it accounts for a large amount of

overall energy consumption. Energy is a basic

element and requirement for human existence and

development.

To improve the energy efficiency of buildings

building as a place to carry out activities, especially

a house as a place for everyday life. In general, the

process of creating building comfort cannot be

separated from efforts to limit the influence of

outdoor temperature on the building. The warm

outdoor temperature is the most difficult to deal

The temperature in steady-state heat transfer

remains constant throughout time, whereas the

temperature in transient heat transfer fluctuates.

Mathematical formulas can be used to describe

these processes. Even today, a variety of software is

suit the environment it is exposed. How the building

envelope is constructed has a great effect on the

energy required for heating and cooling to maintain

human thermal comfort. Understanding how the

internal climatic conditions react to the building

envelope construction is therefore of great value,

[7].

This study aims to provide an overview of how

much influence the configuration system has on the

installation of an insulating wall layer by using

2 Problem Formulation

Numerical modeling and energy simulation of

buildings is a mature but growing field, benefiting

from new computer and automation techniques that

are increasingly expanding into even the most

mundane sectors of activity.

new challenges and new ways of optimizing

problem solving.

A second risk that the development of

technology can pose for people is the enclave of

science for certain private research centers and the

promotion of specific products, which, under patent

or copyright protection (which nowadays are more

likely to block the development of science than to

promote it), only esoterically keep certain research

results within themselves for commercial

- Spectral method.

Figure 1 presents a composite wall, a wall made

of several layers of different materials. The

composite wall consists of three layers of

The validation of the numerical solution will be

made by comparison with the overall analytical

solution.

The computational relationship characterizing

the wall and the outside air, [W/m2K];  is the

convection coefficient between the wall and the

indoor air, [W/m2K];  is the thickness of each wall

layer, [W/mK];

The value of the convection coefficient between

the wall and the outside air was taken as 24 W/m2K.

The value of the convection coefficient between the

wall and the indoor air was assumed to be 8 W/m2K.

W/m2K

Fig. 3: Wall structure from outside to inside-model in ANSYS

Fig. 4: Wall structure - with values for temperatures

and convection coefficient on the outer/inner faces

Fig. 5: Simulation of temperatures variations in the

multilayer wall, from outside to inside

insulation, t1=-14.79C

Figure 4 shows the structure of the wall detailing

the values of indoor/outdoor temperatures and

convection coefficient for the interior and exterior

surfaces.

After determining the temperatures between each

program the obtained value was q = 6.585 W/m2

also very close comparing to the calculated one.

Figure 6 presents the heat flow simulation at the

multilayer wall.

Figure 7, Figure 8 and Figure 9 show the

simulation of the temperatures at the level of each

component layer of the multilayer wall, on the inner

surface, t3, between the inside component layers, t2,

and at the level of the layer in contact with the outer

surface, t1.

+20C, to -15C, as considered and the temperatures

determined using the Ansys program simulation

from outside to inner surface are: t3=-14.79C,

It can be seen that the largest temperature

layer, i.e. a difference of 10 degrees Celsius, from,

9).

The heat flow transmitted from the inside of the

considering the values of indoor/outdoor

temperatures constant throughout the simulation

period, the simulations were performed in steady

state regime.

References:

[1] Gowtham, Rajakumar, Design and Analysis

[10] Ghalambor S., Analitycal solutions of steady-

[11] Jaivignesh, J., Menon, S., Gadhwala, S.,