Catalogue Search | MBRL
Are you sure you want to remove the book from the shelf?
{{itemTitle}}
103,772
result(s) for
"Heat exchangers"
Sort by:
A comprehensive review of methods of heat transfer enhancement in shell and tube heat exchangers
A wide range of studies was conducted to increase the heat transfer rate and reduce the size and cost of shell and tube heat exchangers (STHE). The paper’s contributions lie in its ability to provide a comprehensive, up-to-date, and systematic overview of the various methods available for heat transfer enhancement in STHEs, making it an essential resource for researchers, engineers, and practitioners in the field of heat transfer. The studies that researched the overall heat transfer coefficient (
U
), number of transfer units, exergy efficiency, pressure drop, and thermal–hydraulic performance were reviewed. There are some advantages of the passive method such as no external needed power and lower operating cost compared to the active methods. The studies broadly support the view that heat transfer enhancement in STHE is heading toward considerable progress. A total of 47.8% of studies have focused on the passive approach, the air injection method, enhancing heat transfer utilizing nanofluids, and compound methods have percentages of studies 20.2, 22.3, and 9.7%, respectively. The air bubble injection causes the rise of the
U
ratio where the maximum value was indicated at 452% compared to only water flow. Swirl vane, corrugated tube, and wire coil insert have U ratio values of 130, 161, and 264%, respectively. Nanofluid results in a growth in the heat transfer where the TiO
2
has the maximum
U
ratio (175.9%) compared to traditional fluid. The combination of air injection and passive heat augmentation methods, which was shown to be a substantial solution to several issues, needs to be the focus of more work in the future. Geometrical changes in tube surfaces in STHE are too required in the future with the use of materials coating to enhance heat transfer. The theoretical analysis of heat transfer techniques still needs to be improved, especially for pertinent empirical formulations. Also, since there aren’t many relevant numerical simulations, more attention is required.
Journal Article
Teaching learning optimization and neural network for the effective prediction of heat transfer rates in tube heat exchangers
Heat exchangers are widely used in many field for the purpose of heat from one medium to another. In heat exchanger one or more fluids are used, and which are various types based on its flow and construction. Design of heat exchanger is one of the important field, in the research due to its application. In recent decade the simulation is used in most of the engineering application. A proper simulation technique can effectively analysis the functionality and behavior of any machine before its construction or production. In this sense the machine learning techniques are used in some simulation analysis to model the machine or engine. In this work we used a hybrid neural network for the modeling of shell and tube type heat exchanger and its heat transfer rate is predicted effectively. The computational performance of the proposed technique is compared with the conventional technique and it is proved the effectiveness of the hybrid machine learning technique.
Journal Article
A Review of Recent Passive Heat Transfer Enhancement Methods
Improvements in miniaturization and boosting the thermal performance of energy conservation systems call for innovative techniques to enhance heat transfer. Heat transfer enhancement methods have attracted a great deal of attention in the industrial sector due to their ability to provide energy savings, encourage the proper use of energy sources, and increase the economic efficiency of thermal systems. These methods are categorized into active, passive, and compound techniques. This article reviews recent passive heat transfer enhancement techniques, since they are reliable, cost-effective, and they do not require any extra power to promote the energy conversion systems’ thermal efficiency when compared to the active methods. In the passive approaches, various components are applied to the heat transfer/working fluid flow path to improve the heat transfer rate. The passive heat transfer enhancement methods studied in this article include inserts (twisted tapes, conical strips, baffles, winglets), extended surfaces (fins), porous materials, coil/helical/spiral tubes, rough surfaces (corrugated/ribbed surfaces), and nanofluids (mono and hybrid nanofluids).
Journal Article
Effect of tube thickness on heat transfer performance in a shell and tube heat exchanger
This study investigates the effect of tube-thickness variation on the heat-transfer performance of a shell-and-tube heat exchanger designed for high-purity oxygen production with a capacity of 30 tons per day. The design was conducted in accordance with TEMA and ASME Section VIII Division II standards. A computational fluid dynamics (CFD) approach was implemented using SimScale to simulate heat transfer effectiveness across tube thickness variations ranging from 0.5 mm to 1.5 mm. All other geometric and operating parameters were held constant to isolate the wall-thickness effect, and effectiveness (ε) was computed from CFD outlet temperatures using the standard Q/Q max definition under steady conjugate heat-transfer conditions. Results showed a significant inverse relationship between tube thickness and heat exchanger effectiveness. The maximum effectiveness was 0.969 for a tube thickness of 0.5 mm, while the lowest was 0.931 at 1.5 mm. A verification protocol comprising mesh refinement and global energy-balance checks was conducted to ensure numerical consistency, and CFD predictions were benchmarked against an analytical ε–NTU hand calculation, yielding a maximum deviation of less than 5%. These findings highlight the importance of optimizing tube geometry to enhance thermal performance in industrial heat exchanger applications. In practice, the thermal gains from thinner tubes must be balanced with ASME/TEMA minimum-thickness and mechanical-integrity constraints, providing an isolated and actionable quantification of wall thickness impact for industrial STHE design.
Journal Article
Comprehensive review on exergy analysis of shell and tube heat exchangers
Heat exchangers (HEs) are used for several applications including chemical processes, power plants, air conditioning systems, etc. The performance of these devices could be influenced by different constituents such as the mass flow rates and temperatures of streams, characteristics of heat exchanger and thermo-physical properties of the fluid flows. Regarding the importance of entropy generation and second law analysis for heat exchangers, it is crucial to investigate different involving parameters to gain detailed insight into the defects of the system and potentials for performance enhancement. In this article, studies related to entropy generation and exergy analysis of shell and tube heat exchanger (as one of the most common types of HEs) are comprehensively reviewed and discussed. It can be concluded that modification in the thermos-physical properties of the fluids would lead to reduction in the entropy generation and consequently higher exergy efficiency. Furthermore, it is found that operating conditions of the heat exchangers, especially mass flow rates and temperatures of the streams, play key role in entropy generation.
Journal Article
Support vector machine for modelling and simulation of heat exchangers
Manufacturing simulation is an encouraging field in every manufacturing industry. The manufacturing simulation facilitate to virtually analysis the performance of the product before manufacturing. So for most of the manufacturing activities are simulated effective and researchers have developed adequate tool for the simulation of various activities of manufacturing. Heat exchanger is one of the important devices used for the purposes including medical, food processing, air conditioning system, etc. Performance of these heat exchangers also important for achieving better performance in those fields. So simulation of heat exchanger gives more beneficial to the engineers to analysis its performance before manufacturing. Hence in this paper, a machine learning approach for the modelling and simulation of heat exchanger is proposed. The proposed technique uses support vector machine technique for the prediction of performance of the heat exchanger. The performance of the proposed technique is validated in terms of prediction accuracy. Ultimately the analysis proves that the proposed technique is more beneficial for the modelling of heat exchanger.
Journal Article
Compact Spiral Plate Heat Exchanger: A Comparison with Conventional Alternatives on Scaling and Fouling Mitigation
Scaling and fouling are major issues in the operation of heat exchangers, often leading to reduced heat transfer efficiency, increased pressure drop, and higher operational expenses. These issues are crucial while handling fluids prone to depositing solids or impurities on heat transfer surfaces over time. Addressing these challenges, this paper proposes an effective design of a spiral plate heat exchanger, especially intended to mitigate fouling and scaling effects, hence enhancing longevity and operational performance. Utilizing river water at an ambient temperature (25[degrees]C/ 77[degrees]F) as the cooling medium makes the design an environmentally friendly solution. The discharged coolant can be released back into the river without significantly disturbing the aquatic ecosystem. The performance of the spiral plate heat exchanger (SPHE) was evaluated and compared with other traditionally used heat exchangers in industries, such as double pipe heat exchangers and shell & tube heat exchangers. The computational analysis indicates that the spiral plate type heat exchanger (SPHE) can achieve similar performance to these conventional models while possessing a much-reduced installation space. The study also explores the performance variation of the design by changing its spiral geometry, which ensures its adaptiveness to the requirements of different applications.
Journal Article