Optimization of Shell and Tube Heat Exchanger

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...

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...

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.

In the present study inlet temperature of shell and tube side are taken as input parameters with a given bundle arrangement of square pitch. The thermal analysis is done firstly taking water inside the tube and steam on shell side. The design of shell and tube exchanger using Kern method for water and steam combination is validated by well-known Dittus-Boelter equation of turbulent flow inside tube. The analysis is extended using the above Kern method with different fluid combinations such as sulphur-dioxide on the tube side steam on shell side and carbon-dioxide side on tube side and steam on shell side, Parameters such as heat transfer coefficient, friction coefficient, length, area and pressure drop are determined. "C" Program is written to evaluate the above parameters. Graphs are drawn to depict the behavior for different fluid combinations. The results are tabulated.

— The importance of mini shell and tube heat exchangers (STHEs) in industrial and other engineering applications cannot be underestimated. Hence, based on the problems associated with the design of STHEs, a mini STHE was developed for transfer of heat between two fluids without mixing on the laboratory scale using locally available materials and technology based on an optimized LMTD technique. The performance of the heat exchanger was assessed and evaluated to determine the optimum combination of design parameters. Copper was utilized for the tube side fluid due to its higher thermal conductivity and anti-microbial property, while galvanized steel was used for the shell side fluid due to its cost and corrosion resistance. Parametric studies were carried out on STHE design parameters to obtain an optimal design for efficiency and effectiveness after relevant design considerations. Experimental results were validated with quantitative models, and it was discovered that both Dell-Belaware and Engineering Science Data Unit (ESDU) approaches produced the optimal results required for the selection of shell side and tube fluid film coefficients, respectively over other correlations. In conclusion, the values of parameters of interest were also presented after rigorous mathematical calculations at optimal level and probable recommendations were later made.

Design Optimization of Shell and Tube Heat Exchanger (STHE) and its effect on Related Parameters: A Review, 2016

— A device used for efficient heat transfer from one medium to another is called Heat Exchangers. In the case of heat exchangers mediums through which heat is transfer may be solid wall as they never mix or it may be a media which are at a straight contact. To optimize the cost is a basic task for both designer and users. The current paper presents a brief review the design optimization of heat exchanger in main by various researchers considering various parameters that affect the optimal design and efficiency in case of shell and tube heat exchangers.

International journal of engineering research and technology, 2021

Heat exchangers are the devices used to transfer heat from one fluid to another. Fluids can be either gases or liquids. plate heat exchanger, Double pipe heat exchanger, shell and tube heat exchanger, condensers, evaporators and boilers are the most common types of heat exchangers. They are widely used in petroleum refineries, sewage treatment, air conditioning, power station, space heating and petrochemical plants. Tube and shell tube and shell heat exchanger is type of heat exchanger in which two fluids which are at different temperatures are separated by solid wall. this article includes thermal design calculation and verification of all the process parameters which are required for proper functioning of the compressor system as a whole. the design calculations of tube and shell heat exchanger are verified by HTRI(Heat Transfer Research Inc.) software. This is the software for the rating, design, and/or simulation of a wide variety of heat transfer equipment, including shell-and-tube and non-tubular exchangers, air coolers and economizer s, and fired heaters.

2018

Sahil Suman, Vivek Kumar Chaudhary, Ayush Raj, Kuldeep Rawat. AbstractAn un-baffled shell-and-tube heat exchanger design with respect to heat transfer coefficient and pressure drop is investigated by numerically modelling. The flow and temperature fields inside the shell and tubes are resolved using a commercial CFD package considering the plane symmetry. For single shell and tube bundle is compared experimentally with CFD simulation. The results are found to be sensitive to turbulence model and wall treatment method. There are certain regions of low Reynolds number in the core of shell of heat exchanger. Thus, kω SST model, with low Reynolds correction, provides better results as compared to other models. The temperature and velocity profiles are examined in detail. It is seen that the flow remains parallel to the tubes thus limiting the heat transfer. Approximately, 2/3 of the shell side fluid is bypassing the tubes and contributing little to the overall heat transfer. Significant...

2015

Shell and Tube Heat exchanger are the basic types of heat exchanger one of the fluids flow through a bundle of tubes enclosed by a shell. The outer fluid is forced through a shell and it flows over the outside surface of the tubes. Such an arrangement is employed where reliability and heat transfer effectiveness. In order to achieve the maximum heat transfer rate an analysis is made on single tube with two different fluids (Water and Al2O3-water based Nano fluid) in a shell and tube heat exchanger. With relate to same to have a maximum heat transfer rate this paper gives various optimal design solutions using computational techniques. To measure the performance of different designs, its model is suitably designed and fabricated so as to perform experimental tests. Thermal analysis has been carried out for different design with two fluids and on the basis of comparative results is made which one give the best heat transfer rates.

2018

This article presents a way for evaluating the overall coefficient of heat transfer, analyzed in a tube and shell heat exchanger, with a single pass through the tubes and shell, where hot fluid circulates through the tubes and cold fluid through the shell. This analysis is based on the different operating conditions of the fluids, by varying their volumetric flows in a range of 40°C to 60°C, recording the data obtained experimentally for each run. Simulation of this process was also carried out with the Aspen HYSYS plus® software, and its results were compared with the data obtained experimentally.