scholarly journals A Numerical Study of Small-Scale Longitudinal Heat Conduction in Plate Heat Exchangers

Energies ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1727 ◽  
Author(s):  
Saranmanduh Borjigin ◽  
Ting Ma ◽  
Min Zeng ◽  
Qiuwang Wang
Keyword(s):  
Heat Conduction ◽  
Heat Exchangers ◽  
Numerical Study ◽  
Small Scale ◽  
Plate Heat

Investigation of heat transfer and hydraulic resistance in small-scale pillow-plate heat exchangers

Energy ◽  
2019 ◽  
Vol 181 ◽  
pp. 1213-1224 ◽  
Author(s):  
Olga Arsenyeva ◽  
Mark Piper ◽  
Alexander Zibart ◽  
Alexander Olenberg ◽  
Eugeny Y. Kenig
Keyword(s):  
Heat Transfer ◽  
Hydraulic Resistance ◽  
Heat Exchangers ◽  
Small Scale ◽  
Plate Heat

scholarly journals Numerical Study of Flow Maldistribution in Multi-Plate Heat Exchangers Based on Robust 2D Model

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3121 ◽  
Author(s):  
Arkadiusz Brenk ◽  
Pawel Pluszka ◽  
Ziemowit Malecha
Keyword(s):  
Heat Exchangers ◽  
Numerical Study ◽  
High Heat ◽  
Pressure Balance ◽  
Plate Heat ◽  
Pressure Losses ◽  
Heat Transfer Efficiency ◽  
High Heat Transfer ◽  
Wide Range ◽  
Flow Maldistribution

Plate heat exchangers (PHE) are characterized by high heat transfer efficiency and compactness. An exploitation problem of the PHE is related to flow maldistribution, which can make part of the PHE idle, resulting in overheating and damage. Making geometrical modifications to the PHE can help reduce flow maldistribution. Modifications should be kept to a minimum, so as not to complicate the production process. There is a large number of possible geometrical modifications, which simply considers additional obstacles or stream dividers. To test all of them would be impractical and would also take a prohibitively long amount of time to obtain experimental measurements. A typical PHE is characterized by a complex system of channels. Making numerical calculations of its 3D model can be prohibitively time and resource-consuming. The present work introduces a physically consistent methodology of the transformation of a real 3D geometry to its 2D representation. Its main novelty is to assure the same pressure drop balance remains between the 3D and 2D geometries. This is achieved by a preservation of the same cumulative pressure losses in both geometries. The proposed innovative approach levels the pressure balance difference by adding properly designed local geometrical modifications. The developed methodology allowed a wide range of parameter space and various geometrical modifications to be investigated, and revealed geometrical optimizations leading to the improved performance of the PHE. To minimize the influence of other factors, an incompressible and single-phase flow was studied.

Thermal Simulation of Plate-Fin Heat Exchangers

2013 ◽  
Vol 291-294 ◽  
pp. 1623-1626 ◽  
Author(s):  
Jin Jin Tian ◽  
Zhe Zhang ◽  
Yong Gang Guo
Keyword(s):  
Heat Conduction ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Temperature Response ◽  
Process Industry ◽  
Geometrical Parameters ◽  
Fluid Temperature ◽  
Recent Past ◽  
Plate Heat ◽  
Transfer Data

Plate-fin heat exchangers are playing an important role in the power and process industry in the recent past. Hence, it has become necessary to model their temperature response accurately. A new mathematical model of plate-fin heat exchanger is proposed, considering the heat conduction resistance along the fins and the separating plates. The effects of fin geometrical parameters and spacer thickness on the performances of the heat exchanger have been numerically calculated. It is found that the heat conduction resistance of fins has significant influence on the outlet fluid temperature variation. The analysis presented here suggests a better method of heat-transfer data analysis for plate heat exchangers.

Numerical study on heat transfer enhancement in capsule-type plate heat exchangers

2016 ◽  
Vol 108 ◽  
pp. 1237-1242 ◽  
Author(s):  
Yanfeng Zhang ◽  
Chen Jiang ◽  
Zonglin Yang ◽  
Yiyuan Zhang ◽  
Bofeng Bai
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Heat Exchangers ◽  
Numerical Study ◽  
Transfer Enhancement ◽  
Plate Heat ◽  
Capsule Type

Heat transfer enhancement in pillow-plate heat exchangers with dimpled surfaces: A numerical study

2019 ◽  
Vol 153 ◽  
pp. 142-146 ◽  
Author(s):  
M. Piper ◽  
A. Zibart ◽  
E. Djakow ◽  
R. Springer ◽  
W. Homberg ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Heat Exchangers ◽  
Numerical Study ◽  
Transfer Enhancement ◽  
Plate Heat

A numerical study on the internal heat leak mechanisms in a variable property three-stream heat exchanger

2021 ◽  
pp. 095765092110149
Author(s):  
Yasser Shafiei-alamooti ◽  
Ali Ashrafizadeh
Keyword(s):  
Heat Transfer ◽  
Thermal Analysis ◽  
Heat Conduction ◽  
Heat Exchanger ◽  
Temperature Distribution ◽  
Heat Exchangers ◽  
Numerical Study ◽  
Internal Heat ◽  
Heat Leak ◽  
Maximum Heat

Heat leakage mechanisms need to be addressed in the thermal analysis of multi-stream heat exchangers due to their effects on the intended heat transfer between the streams. In this paper, multi-dimensional heat transfers between various fluid streams and also between the fluid and solid parts of a three-stream plate-fin heat exchanger is numerically modeled considering the variation of thermo-physical properties of both solid and fluid parts. All internal heat leak mechanisms, i.e. longitudinal heat conduction, transverse bypass through fins, and heat transfer reversal in a stream are taken into consideration. The distribution of longitudinal heat conduction along the stream’s separating plates (plates) is also explored. It is shown that the longitudinal heat conduction depends strongly on the variation of properties in some flow arrangements. For such cases, the plates experience areas with relatively low temperature, and a new longitudinal heat conduction, mainly induced by property variation, is identified and presented. This induced longitudinal conduction is close to 1% of the maximum heat exchange between the streams in this study. Another interesting result is that the longitudinal temperature distribution in the plates does not necessarily follow the temperature distribution along the nearby streams due to the entrance effects and unbalanced heat capacity rates. Numerical results show that property variations affect all of the thermal leakage phenomena and, therefore, need to be considered in the modeling and thermal analysis of multi-stream heat exchangers.

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