Thermal Analysis and Performance Evaluation of Triple Concentric Tube Heat Exchanger 3901 (original) (raw)

Thermal Analysis and Performance Evaluation of Triple Concentric Tube Heat Exchanger

International Journal of Engineering and Advanced Technology

Triple concentric-tube exchanger (TCTHE) is an improved version of double concentric tube heat exchanger (DCTHE). Introducing an intermediate tube to a DCTHE provides TCTHE and enhances the heat transfer performance. Recognizing the need of experimental results, extremely scarce in the literature and essential to validate theoretical analyses, the aim of this work is to investigate thermal behavior of TCTHE. The present study includes design, development and experimental analysis of TCTHE for oil (ISO VG 22) cooling application required for industrial purposes. It comprises of water (cooling fluid) flowing through innermost tube as well as outer annulus and oil (hot fluid) flows through inner annulus. The experimental studies of the temperature distribution for three fluids along the length and heat transfer characteristics for TCTHE under insulated condition for counter current flow mode are carried out and discussed. The effect of change in oil (hot fluid) temperatures is analyzed...

Analysis of the heat transfer in double and triple concentric tube heat exchangers

IOP conference series, 2016

The tubular heat exchangers (shell and tube heat exchangers and concentric tube heat exchangers) represent an important category of equipment in the petroleum refineries and are used for heating, pre-heating, cooling, condensation and evaporation purposes. The paper presents results of analysis of the heat transfer to cool a petroleum product in two types of concentric tube heat exchangers: double and triple concentric tube heat exchangers. The cooling agent is water. The triple concentric tube heat exchanger is a modified constructive version of double concentric tube heat exchanger by adding an intermediate tube. This intermediate tube improves the heat transfer by increasing the heat area per unit length. The analysis of the heat transfer is made using experimental data obtained during the tests in a double and triple concentric tube heat exchanger. The flow rates of fluids, inlet and outlet temperatures of water and petroleum product are used in determining the performance of both heat exchangers. Principally, for both apparatus are calculated the overall heat transfer coefficients and the heat exchange surfaces. The presented results shows that triple concentric tube heat exchangers provide better heat transfer efficiencies compared to the double concentric tube heat exchangers.

Thermal Analysis of Heat Exchanger Tubes: A Review

2019

Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion and exchange of thermal energy and heat between physical systems. This paper consists of a review of different a thermal analysis of heat exchanger tube by using different parameters. A model of shell and tube type heat exchanger having both interacting mediums as water and steam is considered. In review of some paper thermal analysis of Heat Exchanger has been taken. Analysis has been done in ANSYS performed by applying several thermal loads on different faces and edges. Some authors have done theoretical calculations C code which is useful for calculating the thermal analysis of a counter flow of water-oil type shell and tube heat exchanger. And some authors found the heat transfer capabilities of several thermal materials which have been compared by assigning different materials.

Shell and Double Concentric Tube Heat Exchanger Calculations and Analysis

Journal of Engineering

This study concerns a new type of heat exchangers, which is that of shell-and-double concentric tube heat exchangers. The case studies include both design calculations and performance calculations. The new heat exchanger design was conducted according to Kern method. The volumetric flow rates were 3.6 m3/h and 7.63 m3/h for the hot oil and water respectively. The experimental parameters studied were: temperature, flow rate of hot oil, flow rate of cold water and pressure drop. A comparison was made for the theoretical and experimental results and it was found that the percentage error for the hot oil outlet temperature was (- 1.6%). The percentage errors for the pressure drop in the shell and in the concentric tubes were (17.2%) and (- 39%) respectively. For cold water outlet temperature, the percentage error was (- 3.3%), while it was (18%) considering the pressure drop in the annulus formed. The percentage error for the total power consumed was (-10.8%). A theoretical compa...

Analytical and Numerical Design Analysis of Concentric Tube Heat Exchangers – A Review

IOP Conference Series: Materials Science and Engineering

This paper considers an analytical and a numerical approach in the design of a concentric tube heat exchanger. Sensible heat transfer is considered in the analysis and the heat exchanger is developed for actual operating conditions in a chemical plant. The heat exchanger is a concentric tube heat exchanger where hot oil exchanges heat with hot water. Hot oil is in the inner pipe and the heating medium, hot water, is in the outer pipe (annular side) of the heat exchanger. An analytical model employing effectiveness-number of transfer units (ɛ-NTU) approach and log mean temperature difference (LMTD) approach were employed in the design of the concentric tube heat exchanger. In the design process, performance charts were developed for concentric tube heat exchanger. Performance charts describe the performance of the heat exchanger in terms of crucial dimensionless parameters. Performance charts help to select the right number of transfer units (NTU) for the given heat exchanger. Both parallel and counter flow configurations were considered for the design analysis. Likewise, a numerical model was also considered in the design of the heat exchanger. The results from the analysis are presented and compared. From the results it can be seen that both numerical and analytical approaches produce the exact same results. The designer certainly has the flexibility to choose an appropriate design methodology based on the available inputs and requirements.

CONSTRUCTION AND ANALYSIS OF TUBE IN TUBE TYPE HEAT EXCHANGER

This paper is concerned about the study of heat transfer of hot water with different types of cooling fluids used in horizontal tube in tube type Heat Exchanger of 1.6m length. Aim of this study is to compare and plot results for parallel and counter flow in Heat exchanger for different cooling fluids. Cooling fluid used in this experiment for taking readings is water. Water as a coolant play an important role in many industry sectors including power generation, chemical production, airconditioning , transportation and microelectronics. Also this experiment will give heat transfer rates for different flow rate of hot water and cooling fluid.

Experimental and Simulation Investigation of Pipe Tube Heat Exchanger

As far today's demand is to manufacture a compact car so there is an urgent need to design an effective heat exchanger. In this paper the effect of fluid on pipe heat exchanger on overall heat transfer coefficient is studied. The overall heat transfer coefficient is studied for pipe heat exchanger with different mass flow rate 1 Lit/hr, 2 Lit/hr and 3 Lit/hr coolant flow Lit/hr @ same surface heating on pipe heat exchanger. Pipe tube heat exchangers are common and vital components in many energy systems. Pipe tube heat exchangers are widely used in several domains such as heating, ventilating, refrigeration and air conditioning systems A fluid fin performance is commonly expressed in terms of pipe tube heat transfer. This case is the one experimental performance on Pipe Tube Heat exchanger for finding Heat Transfer Coefficient of fluid because this corresponds to the maximum driving potential (temperature difference) for convection heat transfer. The research work summarized in this presents a combined analytical, experimental and numerical investigation of Overall heat transfer coefficient of coolant as water by use of pipe tube heat exchanger force convection. The results for the fluid on pipe tube heat transfer were compared with simulation of pipe heat exchanger by software Ansys 14.1. The experimental system is for investigation for Heat transfer coefficient of fluid as water from the experiment pipe tube heat exchanger gives the heat transfer coefficient 401.9212W/m 2 K.and by software simulation its heat transfer coefficient valid of 383.73W/m 2 K.

Comparison of heat transfer coefficient on single tube and multi tube heat exchanger

Journal of Physics: Conference Series, 2019

Heat exchanger (HX) is a device that provides heat exchange between two fluids that have temperature difference. Heat exchanger is widely applied to industrial process, power plant, transportation, air conditioning and refrigeration. In this study, the heat transfer coefficient between single tube and multi tube with the same heat transfer surface area are compared. The dimension of single tube heat exchanger is 40 cm length with 9.5 cm diameters. On the other hand, the multi tubes heat exchanger consists of ten tubes with 0.95 diameters and 40 cm length. These heat exchangers are submerged in low temperature water and the ambient air is streamed by fan with 0.0032 kg/s, 0.0026 kg/s, and 0.002 kg/s of mass flow rate. The experiment is performed for two hours. The temperature of ambient, outlet air, and water are recorded using T-type thermocouple. The heat transfer coefficient are then analyzed. The result shows that heat transfer coefficient of multi-tubes heat exchanger are 26.6% higher than single tube heat exchanger.

Analysis of Heat Exchanger through Different Materials Tubes

Double pipe heat exchanger is simplest type's concentric pipes of different diameter. In this paper parallel and counter both flow arrangements will do. Selecting different materials copper, aluminum and steel for heat exchangers and producing tubes of heat exchangers have been studied and the discus effects of thermal conductivity on them. Operations on the different tubes with different materials are having the same dimensions (diameter and length) and the factors affecting heat exchangers. Further, selection of the most appropriate tube material and obtained with regard results to these factors. By analysis and experimentation of systematic data degradation leads to the conclusion that the maximum heat transfer rates is obtained in case of the inward counter flow configuration compared to all other factors, except these we observe to vary with small difference in each section. Comparing of these three tube heat exchangers, effectiveness is more for copper tube heat exchanger ie., it can carry out more heat from inner hot fluid to outer cold fluid. The correlations of Nusselt number, Reynolds number and Prandtl number will be determined through multivariate linear normal regression.