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TO MODERN HEAT EXCHANGERS REQUIREMENTS AND METHODS
OF INTENSIFICATION OF THE PROCESS AND THE CALCULATION
OF PROMISING CHASE PROFILES.
Abdullayev Zokirjon Djurayevich
Akbarov Adham Axadovich
Ummatov Rustambek
Xomidov Xushnudbek Rapiqjon o’g’li
Bobonazarov Shukurjon
Kokand state university
https://doi.org/10.5281/zenodo.15379091
Annotation.
This article explores the issues of process intesivation in shell-
sulfur heat exchangers used in industrial enterprises. On the basis of the laying
of existing problems, the application of ribbed structures in shell-bearing
devices and its effect on the processes of productivity and heat exchange were
transferred from a multi-stage Ridge laying.
Key words:
Shell-pipe, intensification, acceleration, heat, heat flow,
temperature, corrosion.
Introduction
Modern heat exchangers must meet the following technical requirements;
- intensification of the heat exchange process, ensuring the transfer of the
required amount of heat from one environment to another with the acquisition
of the final temperature;
- the working environments of the device must be effective and reliable in
various homogeneous aggregate states of the given thermodynamic parameters
(pressure, temperature and yield) and heat exchanger product;
- device chests and working surfaces must be resistant to various
homogeneous chemicals used during the cleaning period;
-it is necessary to extend the life of the working bodies of the device;
Currently, experts are faced with problems that can be combined into three
main groups in the development of improved heat exchangers:
First group:
the problems in this group are related to the life of heat
exchanger devices, in which heat exchanger surfaces are subjected to pollution,
corrosion, as well as thermomechanical leads in the temporary modes of
operation of heat exchanger devices. All of these problems affect heat transfer
(heat transfer number or heat transfer coefficient) properties
.
Second group:
this guru includes contact details of heat exchangers and
problems of compactification of them. In this case, it is important to create
compact constructions vav to ensure the intensity of the process.
THEORETICAL ASPECTS IN THE FORMATION OF
PEDAGOGICAL SCIENCES
International scientific-online conference
146
Third group:
these are problems of increasing the upper limit of the heat
or cold agent.
In order to increase the efficiency and compactness of heat exchanger
devices, it is necessary to develop mainly new schemes, create new promising
methods and constructions of heat transfer, including the intensification of
vortex and circulating current in the device's working chutes.
Currently, there is a lot of research on these problems. In general, profiling
heat-exchanging bladder surfaces provides a transition from laminar flow in the
bladder to turbulent flow. This in turn makes it possible to intensify the thermal
conductivity. Such a method affects the rapid renewal of the flow boundary layer
and turbulence. The change in the profile of the working quince adds massively
to the increase in heat exchanger faces. This in turn ensures an increase in the
coefficient of heat and causes hydraulic resistance to rise in the device. In
addition, the Reynolds number also increases this condition increases the
natural turbulence of the flow. It should be noted that the use of structures that
generate vortices and circular currents in the internal chutes of a heat exchanger
device reduces the contamination of the chutes.
When creating intensified methods of heat exchange and applying it to
practice, the technical conditions of the process and the characteristics of the
long-term operation of heat exchanger devices are considered. In order to
achieve a complete solution in providing intensity, it is also necessary to
consider the following:
1.Increase the heat transfer power of the agent without changing the power
of the heat exchanger agent transmitting pump or the hydraulic resistance of the
device;
2.Reducing the temperature difference between heat exchanger products
without changing the structural dimensions of the device and the number of
zones;
3.Reducing its constructive parameters while maintaining the heat
exchanger agent capacity and the level of hydraulic resistance of the device;
4.Reducing the power of heat exchanger surfaces while maintaining the
specified power in the heat exchanger device;
5. The creation of energy-efficient constructions of promising listed quivers.
1; factors 2 and 4 serve to save the energy spent on the process. Factor 3, on
the other hand, will save resources (metal consumption and a decrease in the
cost of the device). Factor 5 is general, in which each working parameter of the
heat exchanger device must be boholized. This factor is a convenient and simple
THEORETICAL ASPECTS IN THE FORMATION OF
PEDAGOGICAL SCIENCES
International scientific-online conference
147
way to intensify the heat exchange process. Most of the research work currently
underway is also aimed at intensifying the process and minimizing the energy
expended by changing the profile of the chouirs.
Results of the analysis:
The main purpose of accelerating the operation of shell tube heat
exchangers is to equalize the thermal resistance on both sides of the heat
exchanger surface. This can be done in two ways.
1) multiplying the heat exchange surface F, for example, preparing the
surface on the side of the heat carrier agent with a small heat transfer coefficient
α to be faceted.
2) increase the value of the heat-giving coefficient α by correctly selecting
the hydrodynamics of the heat-carrying agent.
When the second method is used, the thermal resistance of the boundary
layer on the heat exchange surface decreases. From the studies it is known that
one of the main factors that prevents heat transfer is considered the boundary
layer resistance. In order to improve heat exchange, it is necessary to lose zones
of movement in the inter-pipe space. To do this, at the exit of the heat carrier
agent from the inter-turbo space or at the entrance to it, the distributor.
Various turbulizers can be used to speed up heat exchange. Turbulizers
heat-carrying media on the outer surface of the tubes will put the boundary
layer in a vortex state or destroy it. As a result, the thermal resistance decreases,
and the heat-giving process accelerates. For example, when using tubes with
volumetric ditches on the outer surface (figure 1.1), the heat-giving coefficient in
the head between the turbans increases by 2 times.
Figure 1.1.Ring-shaped ditch groove.
In a gas–liquid heat exchanger, the coefficient of heat transfer (a
s
) on the
liquid side can reach up to 5 kW/(m
2
•K). On the gas side, however, (a
g
) does not
exceed 0.1 kW/(m
2
•K). The use of flat tubes in such heat exchangers leads to an
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International scientific-online conference
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increase in the mass and size of the device. For this reason, the surface of the
tubes on the side of less efficient heat-carrying agents (gases, liquids with
greater viscosity) is made rimless.
Turbalarni qirrali qilib tayyorlanganda quyidagi tenglikka ahamiyat
berilishi kerak:
α
g
F
g
= α
s
F
s
(1.1)
in this
α
g
va
α
s
– coefficient of heat transfer on the side of gas and liquid
;
F
g
va
F
s
– heat exchange surface on the side of the gas and liquid.
The use of promising Amber profiles is a simple and effective way to
enhance heat transfer. Currently, in most cases, discrete two-or three-
dimensional recesses are used, which are applied evenly, which are part of the
heat exchange surface, as elements of the structure of the profile of the inner
quince, confusing channels in the form of a diffuser, wave-forming elements (in
the form of a wall). It is also effective to use wire and other additives to change
the porphyry of the surface. There are almost an infinite number of possible
hyometric configurations for profile elements on the surface of the Quire. This
can also be seen from the R & D work done on this Soha.
Conclusion
The state of application of annular bulges, which are smoothly performed
on the inner surface of the pipes of accelerating wall heat exchange, is
considered by scientists to be the most effective. In recent times, the
acceleration of thermal amlashination using twisted tubes has attracted the
attention of many researchers. It is such pipes that at a comparable rate of
increase in hydraulic resistance appear to be the most promising solution to the
problem of accelerating heat exchange both on the outer surface of the pipes and
inside them. But it is precisely the question of optimizing hydraulic resistance
that remains complicated.
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