Enhanced shell-and-tube heat exchangers for the power and process industries. Final report (original) (raw)
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A Review on Study of Shell and Tube Heat Exchanger
International Journal of Scientific Research in Science and Technology, 2022
Heat exchangers are used in a variety of industrial and technical settings. The design of heat exchangers is fairly sophisticated, since it necessitates an accurate study of heat transfer rate and pressure drop estimates, as well as considerations like as long-term performance and cost. Whenever heat transfer inserts are employyed, Along with the rise in heat transfer rate, the pressure drop increases as well. The pressure has risen.Energy conservation is critical for both industrial development and environmental impact reduction. Because of current energy prices, the need for energy conservation is rising. More resourceful gadgets can help reduce energy costs. In the refrigeration, automotive, chemical, and process sectors, heat exchangers are the most significant device. As a result, there is a demand in the industrial sector for heat exchangers that are less expensive, more efficient, and smaller. Inserts in channels are widely employed as part of a passive heat transfer augmentation technique.
THE DESIGN OF SHELL AND TUBE HEAT EXCHANGERS -A REVIEW
techniques yield the same exact results. Impact Factor (JCC): 7.6197 SCOPUS Indexed Journal NAAS Rating: 3.11 to schedule any required maintenance activities. There are numerous references available in the literature pertaining to heat exchanger performance modelling, and only the most pertinent studies are discussed in this manuscript. Tahery et al [1] considered new design techniques based on the tube bundle effect in the economic optimization of shell-and-tube heat exchangers. They developed cost estimation techniques for shell-and-tube heat exchangers by introducing new objective functions. The combined reduction of annual capital investment and operating cost led to a decrease in the overall costs of about 10% to 24%. Hadidi et al [2] considered cost minimization of shell-and-tube heat exchangers. They developed a new shell and tube heat exchanger optimization approach based on an imperialist competitive algorithm (ICA). ICA technique was applied to minimize the total cost of the
Journal of Engineering Research
Widely known that, heat exchanger is a device that is being used to transfer thermal energy (enthalpy) between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid, at different temperatures and in thermal contact. The most common heat transfer devices are concentric tube (double pipe), shell and tube and, plate heat exchanger. Nowadays, Shell and tube heat exchangers were used extensively in most industries as petrochemicals, oil and refineries. According to previous survey, almost 45% of heat exchangers utilized are shell and tube heat exchangers due to its highpressure application it is more suitable in the field of oil & petrochemical application. Thus, the following study presented shell and tube type only. Due to complexity of studying heat exchangers experimentally, Computational Fluid Dynamics (CFD) used to simulate the effect of local surface heat transfer coefficients on the surfaces by aid of computer numerical calculation and graphical display. In addition, analysis of the physical phenomena involved in fluid flow and heat conduction would be presented in the following research paper with Comparative designs for shell and tube heat exchangers. The paper considered a review for the design of a shell and tube heat exchanger. A variety of heat exchangers are used in industry and in their products. The objective of this paper is to describe most of these heat exchangers in some detail using classification schemes and the basic design methods for two fluid heat exchangers. The design techniques of recuperators and regenerators. Therein, popular analytical techniques such as log mean temperature difference (LMTD) and effectiveness-number of transfer units (ε-NTU) were considered in the analysis. In the case considered herein, both LMTD and ε-NTU techniques yield the same exact results. Keywords-Heat Exchanger; Shell and tube heat Exchanger; parallel flow; counter flow; single pass shell and tube.
An experimental investigation of heat transfer enhancement for a shell-and-tube heat exchanger
Applied Thermal Engineering, 2009
For the purpose of heat transfer enhancement, the configuration of a shell-and-tube heat exchanger was improved through the installation of sealers in the shell-side. The gaps between the baffle plates and shell is blocked by the sealers, which effectively decreases the short-circuit flow in the shell-side. The results of heat transfer experiments show that the shell-side heat transfer coefficient of the improved heat exchanger increased by 18.2-25.5%, the overall coefficient of heat transfer increased by 15.6-19.7%, and the exergy efficiency increased by 12.9-14.1%. Pressure losses increased by 44.6-48.8% with the sealer installation, but the increment of required pump power can be neglected compared with the increment of heat flux. The heat transfer performance of the improved heat exchanger is intensified, which is an obvious benefit to the optimizing of heat exchanger design for energy conservation.
Design of a Shell and Tube Heat Exchanger
Often, in process industries the feed stream has to be preheated before being sent to the process unit (reactor or distillation column) and the product stream has to be cooled before being sent for storage. In order to minimize heat losses and maximize energy efficiency, the heat removed from the product stream is provided to the feed stream as preheat. This is done with the help of heat exchangers in process industries. Many different types of heat exchangers are available depending on the need of operation; however, shell and tube heat exchangers are by far the most commonly used heat exchangers. In this work, the design of a counter current shell and tube heat exchanger used in nitric acid plants has been presented. The design work has been done considering the desired capacity of the plant, which is 100 tons/day of nitric acid. Two different methods, Kern's method and Bell's method, have been used for the design. Bell's method was found to be more accurate as the overall heat transfer coefficient calculated by Bell's method was close to the assumed value. Further, the design of auxiliary parts of the heat exchanger such as flanges, gaskets, bolts, supports and saddles have also been presented.
Shell and Tube Heat Exchanger Performance Analysis
2014
A heat exchanger is a device that is used to transfer thermal energy (enthalpy) between two or more fluids, at different temperatures and in thermal contact. In this problem of heat transfer involved the condition where different constructional parameters are changed for getting the performance review under different condition. An excel program has been developed for the ease of calculation and obtaining result after changing different parameters. The tube diameter, tube length, shell types etc. are all standardized and are available only in certain sizes and geometry. And so the design of a shell-and-tube heat exchanger usually involves a trial and error procedure where for a certain combination of the design variables the heat transfer area is calculated and then another combination is tried to check if there is any possibility of increasing the heat transfer coefficient. Since several discrete combinations of the design configurations are possible, the designer needs an efficient...
Performance Analysis and Design Optimization of Shell and Tube Heat Exchangers
2021
Shell and Tube heat exchangers are having special importance in boilers, oil coolers, condensers, pre-heaters. They are also widely used in process applications as well as the refrigeration and air conditioning industry. The robustness and medium weighted shape of Shell and Tube heat exchangers make them well suited for high pressure operations. The aim of this study is to experiment, validate and to provide design suggestion to optimize the shell and tube heat exchanger (STHE). The heat exchanger is made of acrylic material with 2 baffles and 7 tubes made of stainless steel. Hot fluid flows inside the tube and cold fluid flows over the tube in the shell. 4 K-type thermocouples were used to read the hot and cold fluids inlet and outlet temperatures. Experiments were carried out for various combinations of hot and cold water flow rates with different hot water inlet temperatures. The flow conditions are limited to the lab size model of the experimental setup. A commercial CFD code wa...
IJERT-Design, Analysis and Optimization of Shell and Tube Heat Exchanger
International Journal of Engineering Research and Technology (IJERT), 2019
https://www.ijert.org/Design,-Analysis-and-Optimization-of-Shell-and-Tube-Heat-Exchanger https://www.ijert.org/research/Design,-Analysis-and-Optimization-of-Shell-and-Tube-Heat-Exchanger-IJERTCONV7IS06022.pdf In present day shell and tube heat exchangers are most common type of heat exchanger widely used in oil refineries and other large chemical process plants since it suits high pressure applications. The objective of the project is to design a heat exchanger with a different baffle and study the flow and temperature field inside the shell using solid works flow simulation software tool and as well as to design, fabricate two shell and tube heat exchangers one with higher heat transfer rate and other with lower heat transfer rate and to compare the results of both experimental values with results of Flow Simulations.