Control of Flow Transport of a Charged Dispersed Heat Carrier in the Heat Exchanger of an Open Type

2004 ◽  
Vol 36 (11) ◽  
pp. 42-50
Author(s):  
Ludmila I. Samoilenko ◽  
Tatyana V. Ilyenko ◽  
Ludmila V. Podgorodetskaya ◽  
Ludmila N. Kolos
Keyword(s):  
Heat Exchanger ◽  
Heat Carrier ◽  
Open Type ◽  
Flow Transport ◽  
Control Of Flow

Unsteady-state heat transfer and mixing of a heat carrier in a heat exchanger with flow twisting

1985 ◽  
Vol 28 (4) ◽  
pp. 867-877 ◽  
Author(s):  
L.A. Ashmantas ◽  
B.V. Dzyubenko ◽  
G.A. Dreitser ◽  
M.D. Segal
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Carrier ◽  
Unsteady State ◽  
State Heat

scholarly journals Impact of Employing Hybrid Nanofluids as Heat Carrier Fluid on the Thermal Performance of a Borehole Heat Exchanger

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2892
Author(s):  
Hossein Javadi ◽  
Javier F. Urchueguia ◽  
Seyed Soheil Mousavi Ajarostaghi ◽  
Borja Badenes
Keyword(s):  
Heat Exchanger ◽  
Pressure Drop ◽  
Heat Carrier ◽  
Pure Water ◽  
Coefficient Of Performance ◽  
Working Fluid ◽  
Hybrid Nanofluid ◽  
Borehole Heat Exchanger ◽  
Carrier Fluid ◽  
Hybrid Nanofluids

In this numerical study, 4 types of hybrid nanofluid, including Ag-MgO/water, TiO2-Cu/water, Al2O3-CuO/water, and Fe3O4-multi-wall carbon nanotube/water, have been considered potential working fluid in a single U-tube borehole heat exchanger. The selected hybrid nanofluid is then analyzed by changing the volume fraction and the Reynolds number. Based on the numerical results, Ag-MgO/water hybrid nanofluid is chosen as the most favorable heat carrier fluid, among others, considering its superior effectiveness, minor pressure drop, and appropriate thermal resistance compared to the pure water. Moreover, it was indicated that all cases of Ag-MgO/water hybrid nanofluid at various volume fractions (from 0.05 to 0.20) and Reynolds numbers (from 3200 to 6200) could achieve better effectiveness and lower thermal resistances, but higher pressure drops compared to the corresponding cases of pure water. Nevertheless, all the evaluated hybrid nanofluids present lower coefficient of performance (COP)-improvement than unity which means that applying them as working fluid is not economically viable because of having higher pressure drop than the heat transfer enhancement.

scholarly journals Development of a heat exchanger device- regenerator for high-temperature gas heating

2019 ◽  
Vol 21 (5) ◽  
pp. 38-49
Author(s):  
D. A. Bazykin ◽  
A. I. Sukhov ◽  
A. V. Barakov
Keyword(s):  
High Temperature ◽  
Heat Exchanger ◽  
Heat Carrier ◽  
High Performance ◽  
Combustion Products ◽  
Low Grade ◽  
Technical Literature ◽  
Gas Processing ◽  
Gas Heating ◽  
Gaseous Media

The urgency of the task is to develop a heat exchanger-regenerator designed for high- temperature heating of gaseous media, which are used in various technological schemes of the petrochemical, gas processing, energy and other industries. The developed heat exchanger has high performance due to the developed heat exchange surface, reliability due to the fact that the inner and outer pipes are movable relative to each other with linear dimensions compensation, it is simple to manufacture, does not require the use of an intermediate heat carrier, can be used as a heating coolant combustion products of untreated, low-grade gaseous fuel. At the same time, it is possible to equip the developed apparatus with a convection heat exchanger for more efficient use of the heat of the fuel combustion products. The article describes the proposed design, the principle of operation of this heat exchanger-regenerator. A review of the technical literature has been carried out, the main advantages of the device are shown in comparison with the currently known domestic and foreign counterparts. The paper presents the main calculated dependencies used in the design, as well as the results of the calculations. The possibility of using the proposed heat exchanger as part of a gas turbine unit used as an autonomous power source is considered, as well as information about technological processes in which it can be used. In conclusion, we can say that the developed heat exchanger has high performance, differs in the ability to work at high temperatures without violating the integrity of the structure, does not require the use of an intermediate heat carrier, and is to be used in many industries.

Energy performance and cost analysis of some borehole heat exchanger configurations with different heat-carrier fluids in mild climates

Geothermics ◽  
2017 ◽  
Vol 65 ◽  
pp. 158-169 ◽  
Author(s):  
Giuseppe Emmi ◽  
Angelo Zarrella ◽  
Michele De Carli ◽  
Mirco Donà ◽  
Antonio Galgaro
Keyword(s):  
Heat Exchanger ◽  
Cost Analysis ◽  
Heat Carrier ◽  
Energy Performance ◽  
Borehole Heat Exchanger

Justification of the Flow Characteristics of the Recuperator for the Thermal Preparation of Machinery and Equipment Units

2020 ◽  
Vol 22 (4) ◽  
pp. 82-93
Author(s):  
Roman Chernukhin ◽  
◽  
Aleksey Dolgushin ◽  
Nikolai Kasimov ◽  
Vladimir Ivancivsky ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Carrier ◽  
Thermal Regime ◽  
Flow Characteristics ◽  
Analytical Determination ◽  
Thermal Processes ◽  
Hydraulic Systems ◽  
Technological Processes

Introduction. Machines and equipment in its composition may contain hydraulic systems to ensure the functioning of the main and auxiliary systems. It is known that a common disadvantage of hydraulic systems and drives is the dependence of the viscosity of the applied fluids on temperature. A noticeable part of technological machines and equipment is located in unheated or poorly heated industrial premises and a change in the viscosity of working fluids with a decrease in the ambient temperature can significantly affect the parameters of technological processes. An important factor in ensuring the stability of the technological processes parameters is the degree of preparation of machines and equipment for operation at low temperatures or in conditions of fluctuating temperature conditions. In this regard, the question arises of ensuring the required temperature of technical fluids before turning on machines and equipment, and maintaining the required thermal regime during the operation of its units and assemblies. One way to solve this problem is to use external heat sources. Various heat exchange devices can serve as such sources. In the heat exchange device, the heat carrier is heated, which is then fed into the heat exchange jacket of the machinery and equipment units. Both liquid and gaseous media are used to heat the coolant in the heat exchanger. In the latter case, the heat exchanger is called a recuperator. The efficiency of the recuperator is determined by its design and flow characteristics. There are methods for the analytical determination of both the design and flow characteristics of the recuperator, but these methods are quite laborious. The use of computer simulation of thermal processes makes it possible to successfully solve the calculation problem, and also significantly reduces the design time of heat exchangers. The aim of the work is to substantiate the flow characteristics of the recuperator for maintaining the thermal regime through computer simulation. The research method is computer simulation of thermal processes, which is implemented using the SolidWorks software package from Dassault Systems and its Flow Simulation application for simulating thermal processes in scientific research and engineering. Results and discussion. Simulation carried out in stationary and non-stationary modes made it possible to determine the effect of pump performance on the temperature of the coolant at the outlet of the recuperator. It is found that when the heat carrier flow rate is more than 20 l/h, its temperature does not reach the required values, despite the fact that the gases leaving the recuperator have a significant residual temperature. The efficiency of the recuperator is assessed by determining the exergy efficiency. Based on the data obtained, the most preferable are the pump productivity values lying in the range from 4 to 20 l/h.

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