scholarly journals Developing the Mathematical Model of Regenerative Heat Exchangers for Energy and Heat Supply Systems of High Temperature Heat Process Units

2015 ◽  
Vol 1 (16) ◽  
pp. 124-131 ◽  
Author(s):  
A V Koshelnik ◽  
D V Lavinskij ◽  
E V Havin ◽  
V G Pavlova ◽  
E P Gordienko
Keyword(s):  
Mathematical Model ◽  
High Temperature ◽  
Heat Exchangers ◽  
Heat Supply ◽  
Regenerative Heat ◽  
Heat Process ◽  
Temperature Heat ◽  
Heat Supply Systems ◽  
The Mathematical Model ◽  
Supply Systems

scholarly journals Planning of heat supply of territories: model and algorithms

2018 ◽  
Vol 39 ◽  
pp. 02001
Author(s):  
Ekaterina E. Mednikova
Keyword(s):  
Mathematical Model ◽  
Heat Supply ◽  
District Heating ◽  
Systems Development ◽  
Important Task ◽  
Heat Supply Systems ◽  
The Mathematical Model ◽  
Supply Systems

The choice of direction of heat supply systems development in cities is an important task for the authorities, district heating companies and consumers. The author focuses on two main problems in heat supply development questions: territory zoning by type of heat supply and determination of economically feasible heat supply systems sizes. For the solution of these problems, the mathematical model and algorithms were developed. For the solution of this task algorithms were developed.

scholarly journals Heat-exchange units with porous inserts

2019 ◽  
Vol 140 ◽  
pp. 05006 ◽  
Author(s):  
Oleg Stepanov ◽  
Boris Aksenov ◽  
Natalia Rydalina ◽  
Elena Antonova
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Heat Supply ◽  
Analytical Data ◽  
Porous Metal ◽  
Hot Water ◽  
Porous Metals ◽  
Proposed Model ◽  
Heat Supply Systems ◽  
Supply Systems

Currently, porous metals are not used in heat supply systems. Usage of porous materials in heat exchangers increases the heat transfer intensity and makes the heat exchangers more compact. An experimental setup consisting of two circuits was developed in order to study the influence of porous metals on heat transfer intensity. In the first circuit the hot coolant is water, which flows through narrow tubes inside the porous metal. In the second circuit the cold coolant is freon. The purpose of the study is to obtain experimental confirmation of the hypothesis of an increase in the heat transfer intensity when using porous metals. To achieve this goal, experiments were carried out, which showed the increased heat transfer intensity. The standard methods for calculating heat exchangers cannot be applied in this case as the inner pores’ surface is unknown. A mathematical model was compiled allowing engineering calculations for the heat exchangers of this type. The hot water temperature inside the heat exchanger is determined analytically. The resulting equation allows us to determine the cooling degree of the first coolant, i.e. hot water. The obtained deviations between experimental and analytical data are within the acceptable limits, which indicates the reliability of the proposed model.

scholarly journals The use of porous metals in the design of heat exchangers to increase the intensity of heat exchange

2020 ◽  
Vol 178 ◽  
pp. 01026
Author(s):  
Natalia Rydalina ◽  
Oleg Stepanov ◽  
Elena Antonova
Keyword(s):  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Exchangers ◽  
Heat Supply ◽  
Analytical Form ◽  
Test Facility ◽  
Porous Metals ◽  
Heat Supply Systems ◽  
Set Up ◽  
Supply Systems

Heat exchangers are widely used in heat supply systems. To increase the efficiency of heat supply systems, heat exchangers with porous metals are proposed to design. There was a test facility set up to study new types of heat exchangers. The countercurrent flow of heat carriers was activated in those heat exchangers. Freon moved through the heat exchanger pores, and water moved through the inner tubes. It should be noted that the porous materials in the heat exchangers differed in the coefficient of porosity. To be compared, one of the heat exchangers did not contain any porous material. The first test cycle proved the feasibility of using porous metals in heat exchange equipment. Afterwards, a simplified mathematical model of the heat exchanger was compiled. Such an analytical form makes a solution convenient for engineering calculations. Numerical calculations based on this model were compared with the experimental data. Heat transfer intensity of materials with different porosity was compared.

scholarly journals RELEVANCE OF CONTAMINATION MODELS FOR DIAGNOSTICS OF PLATE HEAT EXCHANGERS

2020 ◽  
Vol 5 (10) ◽  
pp. 33-40
Author(s):  
Y. Elistratova ◽  
A. Seminenko ◽  
V. Minko
Keyword(s):  
Heat Exchange ◽  
Heat Exchangers ◽  
Heat Supply ◽  
Heating Surface ◽  
Actual Distribution ◽  
Plate Heat ◽  
Salt Deposition ◽  
Theoretical Approaches ◽  
Heat Supply Systems ◽  
Supply Systems

The article analyzes various theoretical approaches to describing the processes of formation of scale layers on the working surfaces of heat exchangers. The main tasks include analyzing existing models of contamination of heat exchange channels, determining the main mechanism of salt deposition on the heating surface of plate heat exchangers of heat supply systems, determining the main factors that determine the intensity of salt deposition on the working plate in accordance with the dynamics of heat and hydraulic processes in heat exchange channels formed by corrugated plates, as well as forming trends for further research. The article presents the main results of research devoted to the study of contamination processes on heating surfaces. Inaccuracies in the proposed approaches to describing the nature of the formation of salt deposition layers are identified. By generalizing existing approaches to the mathematical description of pollution processes, the main assumptions are revealed when describing the processes of salt deposition on working plates. A hypothesis is proposed about the influence of the location of channels relative to the inlet pipe on the uniformity of the flow distribution between parallel channels in the device. There is a fairly large gap between the existing computational methods for modeling pollution processes and the actual distribution of scale layers during the operation of heat exchange equipment of heat supply systems

scholarly journals MODERN METHODS FOR THE INTENSIFICATION OF SHELL AND TUBE HEAT EXCHANGERS IN HEAT SUPPLY SYSTEMS

2018 ◽  
Vol 8 (2) ◽  
pp. 130-140
Author(s):  
L.A. Kushchev ◽  
◽  
N.Yu. Nikulin ◽  
Yu.G. Ovsyannikov ◽  
A.I. Alifanova ◽  
...  
Keyword(s):  
Heat Exchangers ◽  
Heat Supply ◽  
Modern Methods ◽  
Shell And Tube ◽  
Heat Supply Systems ◽  
Supply Systems

scholarly journals Energy efficient optimization of heat supply system for oil therminal

2021 ◽  
Vol 37 ◽  
pp. 42-53
Author(s):  
P. M. Glamazdin ◽  
E. Sirokhina
Keyword(s):  
Water Vapor ◽  
High Temperature ◽  
Heat Supply ◽  
Operating Cost ◽  
Heat Supply System ◽  
Supply System ◽  
Transport Infrastructure ◽  
Heat Supply Systems ◽  
Supply Systems ◽  
Heat Carriers

In the context of the need to develop the transport infrastructure of Ukraine and to diversify sources of energy carriers supply to the country, including oil and oil products, the problem of the development of oil terminals arises. This work is devoted to the optimization of the structure of heat supply to oil terminals. In this sense it is relevant. The object of research is the heat supply systems of an oil terminal. At the same time, the subject of research is the energy efficiency of heat supply systems for oil terminals using water vapor and high-temperature organic heat carriers. The following research methods were used: an analytical review of information sources, a technical and economic analysis with the necessary substantiating calculations. As a result of the studies, the possibility of using high-temperature organic heat carriers for organizing heat supply to oil terminals has been shown. The advantage in the efficiency, environmental friendliness and reliability of systems with high-temperature organic heat carriers versus systems using water vapor as a heat carrier is shown. On-site heating networks in the oil terminal are recommended. The main advantages are that the heat losses in them have been reduced and the reliability of the system has increased. The cost estimation of capital investments of the compared variants of the heat supply system arrangement is carried out. The centralized heat supply systems have greater equipment cost compared with the decentralized ones. The operating cost for decentralized systems is also lower due to a decrease in specific fuel and electricity consumption. The materials obtained as a result of the research can be used as recommendations for the design of heat supply systems for oil terminals using high-temperature organic heat carriers.

Sign in / Sign up

Export Citation Format

Share Document