Volume 02 Issue 03-2022
42
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
02
I
SSUE
03
Pages:
42-50
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
A
BSTRACT
The article describes the analysis of existing methods for determining the thermal conductivity of liquid
composite thermal insulation coatings and the results of experimental studies on its improvement.
K
EYWORDS
Energy efficient, thermal insulation material, thermal conductivity, microsphere, thermal insulation paint,
stationary method, non-stationary method, thermocouple sensors.
I
NTRODUCTION
Energy conservation and energy efficiency issues
are one of the most pressing issues in the world
today, including the construction and operation
of buildings and structures. This is due to the
limited availability of energy sources, the high
cost of energy and the negative impact it has on
the environment as a result of its
production.Currently, the construction market
offers a variety of thermal insulation materials.
Many new materials are being added to the
Journal
Website:
http://sciencebring.co
m/index.php/ijasr
Copyright:
Original
content from this work
may be used under the
terms of the creative
commons
attributes
4.0 licence.
Research Article
LIQUID COMPOSITE THERMAL INSULATION COATINGS AND
METHODS FOR DETERMINING THEIR THERMAL
CONDUCTIVITY
Submission Date:
February 27, 2022,
Accepted Date:
March 17, 2022,
Published Date:
March 29, 2022
Crossref doi:
https://doi.org/10.37547/ijasr-02-03-07
Tojiboyev Boburjon Tolibjonovich
Assistant, Fergana Polytechnic Institute, Fergana, Uzbekistan
Volume 02 Issue 03-2022
43
International Journal of Advance Scientific Research
(ISSN
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2750-1396)
VOLUME
02
I
SSUE
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Pages:
42-50
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
existing range of polystyrene foam and mineral
wool heaters for use in a variety of climates and
construction conditions [1-3].
T
HE MAIN PART
In recent years, thermal insulation paints based
on hollow ceramics, glass and polymer
microspheres have attracted a lot of attention.
These insulating paints are a high-tech composite
material that forms an ultra-thin polymer coating
with low thermal conductivity and excellent
waterproofing and anti-corrosion (anti-slip)
protection after drying.
The coating is designed for thermal insulation,
waterproofing, protection against corrosion of
thermal and engineering networks, process pipes,
thermal energy and capacity equipment, and for
thermal insulation and protection of facades and
interiors of building structures, residential and
industrial buildings.
This attention can be explained by the extremely
low thermal conductivity of these dyes. For
example, the thermal conductivity of Corundum
paints is 0.001 W/m ℃ [1], while Bronya paint is
0.001 W/m • ℃ [2-7].
Of course, such a thermal conductivity coefficient
gives preference to heat-insulating paints over
conventional
heaters
(extruded
foam
polystyrene, mineral wool, etc.), so the thermal
conductivity of extruded foam polystyrene is
0.030 W/m ℃.
Therefore, the value of the thermal conductivity
of liquid thermal insulation coatings has aroused
the interest of both consumers and researchers,
resulting in many experiments to determine the
thermal properties and effectiveness of these
paints. Under normal conditions, the thermal
conductivity of air is 0.026 W/m•℃, and the
thermal conductivity of an absolute vacuum is 0
W/m•℃ [3].
Air is the best natural heat retainer [4-9].
The Tomsk State Institute of Architecture and
Construction experimented on the method of
GOST 7076-99 [5,11].
As a result of the work, the thermal conductivity
of two dyes was determined - 0.086 W/m•℃ and
0.091 W/m•℃. These results are much worse
than those given by paint manufacturers [4,12].
The thermal conductivity of corundum paint was
determined according to TU 5760-001-
83663241-2008 by the method M-001-2003 [6-
14], developed by the Research Institute of the
Federal State Unitary Enterprise "Santechniki".
The development of this method was due to the
fact that ultra-thin liquid composite coatings
based on glass, aluminium silicate, perlite and
similar microspheres are not suitable for
determining the thermal conductivity by
stationary and nonstationary methods [14,19].
Volgograd State University of Architecture and
Construction was engaged in determining the
thermal conductivity of corundum paint. The
technical conclusion based on the test results
states that the method for determining the
Volume 02 Issue 03-2022
44
International Journal of Advance Scientific Research
(ISSN
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2750-1396)
VOLUME
02
I
SSUE
03
Pages:
42-50
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
thermal characteristics and the value of the
thermal conductivity of corundum paint is 0.001
W/m•℃ [17-22].
NIIMosstroy's technical conclusion based on the
results of thermal engineering tests in accordance
with GOST 26254-84 [8] concludes that the
thermal conductivity value of Corundum-Facade
thermal insulation coating is 0.12 W/m•℃ and
that this material is not suitable for thermal
insulation of external walls [19-25].
Research conducted by the Siberian State
Academy of Motor Road Construction has shown
that heat loss in corundum-coated steel pipe is
20-30% lower than in unpainted pipe [10,26,27].
The differences between the results obtained can
be explained primarily by the lack of normative
methods
for
determining
the
thermal
conductivity of new ultra-thin coatings based on
microspheres. The structure of all such paints
consists of grids of hollow microspheres
interconnected
with
acrylic
film-forming
substances. Therefore, determining the true
thermal conductivity of liquid thermal insulation
coatings is one of the urgent tasks at the present
time. At the "Youth Center for Innovative
Technologies" of the Fergana Polytechnic
Institute, research is being conducted to improve
the method of determining the thermal
conductivity of ultra-thin thermal insulation
coatings. Based on the analysis of currently
available methods in the development of the
method, it was planned to replace the heat meter
with a layer of material with a clear thermal
conductivity using the standard method of
determining the thermal conductivity of liquid
thermal insulation coatings [5]. Such a
substitution does not contradict the theory of the
study of thermal processes [11-19].
Figure 1. Scheme of the device for determining the thermal conductivity of the liquid thermal
insulation coating.
1 stationary heat flow source; 2nd layer of
concrete material with thickness and thermal
conductivity (orgsteklo 𝛿 = 3.2 mm, l = 0.19 W/(m
• ℃); 3rd layer of thermal insulation coating; 4th
layer of thermal insulator (foam);
refrigerator ”(water-filled tank); 6- chrome Kopel
thermocouples made of wire with thickness s =
0.2 mm; 7-switch; 8-thermocouple readings.
Procedure for determining the thermal
conductivity of thermal insulation coating: The
Volume 02 Issue 03-2022
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International Journal of Advance Scientific Research
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VOLUME
02
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SJIF
I
MPACT
FACTOR
(2021:
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)
(2022:
5.636
)
METADATA
IF
–
7.356
coefficient of thermal conductivity of liquid
thermal insulation coating was calculated
according to the following formula:
λ =
𝑑
𝑢
∆𝑇𝑢
𝑞𝑢
− 2𝑅
𝐿
, (1)
Where d
u
– the thickness at the time of sample
testing, m;
ΔT
u
– the temperature difference at the surface of
the test sample, ℃;
q
u
- the density of the stationary heat flux passing
through the test sample, W/m
2
;
R
L
- the thermal resistance of the copper plate
coated with the test sample (paint), (m
2
•℃)/W.
The density of the stationary heat flux passing
through the sample is given by the following
formula:
q
u
=
𝜆
2𝑙𝑎𝑦𝑒𝑟(𝑡1−𝑡2 )
𝛿
2𝑙𝑎𝑦𝑒𝑟
, W/m
2
;
(2)
Where λ and 𝛿 are the coefficients of thermal
conductivity and thickness of the orgstekloni t
1
, t
2
are the temperatures at the boundaries of the
“heat source - orgsteklo layer” and “orgsteklo
layer - test specimen”, respectively.
The thermal conductivity of a copper plate with a
thickness 𝛿 = 0.5 mm is λ = 384/(m ℃).
To stabilize the performance of the equipment
during the study, the readings of the three
thermocouple sensors were measured at 0.5 h
intervals of 5 min to “heat up” all its parts and to
stabilize the heat flow transmission [25-29].
From the graph given in Figure 2, it can be seen
that the equipment readings became stationary
after 15 minutes. To calculate the individual error
of the thermocouple sensors, before starting the
experiments, the temperature of each sensor
immersed in a Dewar vessel filled with melted ice
was measured and the temperature deviation
from 0 ℃ was taken into account during the
experiments.
To determine the reliability of the equipment for
measuring the thermal conductivity of thermal
insulation paint, initial tests were carried out.
Instead of the 3rd layer in the device (Fig. 1), an
orgsteklo plate similar to the 2nd layer in terms
of size, thickness and thermal conductivity was
placed and its thermal conductivity was
measured.
Volume 02 Issue 03-2022
46
International Journal of Advance Scientific Research
(ISSN
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2750-1396)
VOLUME
02
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03
Pages:
42-50
SJIF
I
MPACT
FACTOR
(2021:
5.478
)
(2022:
5.636
)
METADATA
IF
–
7.356
Time, minutes
Figure 2. Indicators of the three thermocouple sensors of the equipment
The measurement results showed that the
thermal conductivity of the tested org-glass plate
was λ=0,186 W/(m
٠
℃). In this case, the error of
the method of determining the thermal
conductivity:
Δ =
0,19−0,186
0,19
100 = 2,1%
and this error are not
more than the error (± 3%) given in GOST [5].
Also, it shows the correctness of the selected
research scheme. In recent years, the Fergana
Polytechnic Institute in collaboration with
Ferganaazot has conducted significant research
on liquid heat-resistant insulation coatings
created by means of hollow microspheres and
various binders (analogue of our heat-saving
coating).The effectiveness of thin-layer heat-
insulating coatings used in heat supply systems
was determined, the technical and economic
efficiency of the use of these coatings was
assessed.
At the BAM workshop of the Center for Energy
Saving Technologies, the effectiveness of the
application of energy-saving coatings on the D76
mm gate valve of the heating steam supply pipe to
the station consumers was evaluated.
0
5
10
15
20
25
30
35
40
45
50
0
5
10
15
20
25
30
T
em
p
er
atur
e,
℃
Ряд 1
Ряд 2
Ряд 3
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–
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ЕI1 Мах
77,6 ℃
Min
56,5 ℃
ЕI2 Мах
354,8 ℃
Min
326,2 ℃
EI3 Мах
159,7 ℃
Min
99,1 ℃
EI4 Мах
163,9 ℃
Min
126,5 ℃
EI5 Мах
152,4 ℃
Min
111,0 ℃
Figure 3. Photo of paint coating.
The inspection was outdoors. The coating is laid
in 3 layers. The final thickness was 3 mm. Total
coating consumption was 0.9 litres.
Data for calculation:
Dpipe = 76 мм.;
Wall = +410 ℃ (without insulation);
Wall- +18,4 ℃ (with coating);
F- area of the gate valve top = 0.3 m2;
1.58 W/m2K for heat-insulated plots;
12 W/m2K for thermally uninsulated plots;
According to calculations, the heat loss from an
uninsulated gate valve is 108.9 Kcal/h, insulated -
9.13 Kcal/h.
The efficiency calculation showed that the coating
allows reducing the heat loss from the surface of
the valve with a diameter of 76 mm from 108.9 to
9.13 (Kcal/h).
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(ISSN
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Pages:
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