Heat Exchanger Handling MWCNT/Water Nanofluids

Md Jasim Alam; Mr. Yasir Baig

doi:10.24113/ijoscience.v7i3.360

Optimizing Design and Analysis on The Helically Coiled Tube Heat Exchanger By Providing Fins

SMART MOVES JOURNAL IJOSCIENCE ◽

10.24113/ijoscience.v6i1.259 ◽

2020 ◽

Vol 6 (1) ◽

pp. 8

Author(s):

Sunil Kumar ◽

Ravindra Mohan

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Pressure Drop ◽

Total Pressure ◽

Outlet Temperature ◽

Tube Heat Exchanger ◽

Helically Coiled Tube ◽

Total Pressure Drop ◽

Optimizing Design ◽

Coil Heat Exchanger

Heat exchangers are an essential part in an assortment of mechanical settings, for example, cooling frameworks, force plants, refineries, and in this way ceaseless endeavor are made to expand their heat transfer efficiencies. Optimize design of helical coil heat exchanger by using fins and the Compare pressure & temperature by conventional design. The final outcome of the study increase the total heat transfer rate inside the domain. And increase the pressure drop inside the domain. The water outlet temperature decrease up to 315k and cold outlet temperature increase up to 320 k. and total pressure drop increase with the temperature increases. Finally the CFD data were compared with previous data the total pressure drop increase up to 0.65 bar for case-2.the overall efficiency of the system incites up to 5% to 6%.

Thermal Design of Heat Exchanger With Fins Inside and Outside Tubes

Volume 5: Marine; Microturbines and Small Turbomachinery; Oil and Gas Applications; Structures and Dynamics, Parts A and B ◽

10.1115/gt2006-90260 ◽

2006 ◽

Author(s):

G. N. Xie ◽

Q. Y. Chen ◽

M. Zeng ◽

Q. W. Wang

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Pressure Drop ◽

Heat Exchangers ◽

Total Pressure ◽

Thermal Design ◽

Operating Pressure ◽

Heat Transfer Area ◽

Tube Heat Exchanger ◽

Total Pressure Drop

Compact heat exchangers such as tube-fin types and plate-fin types are widely used for gas-liquid or gas-gas applications. Some examples are air-coolers, fan coils, regenerators and recuperators in micro-turbines. In this study, thermal design of fin-and-tube (tube-fin) heat exchanger performance with fins being employed outside and inside tubes was presented, with which designed plate-fin heat exchanger was compared. These designs were performed under identical mass flow rate, inlet temperature and operating pressure on each side for recuperator in 100kW microturbine as well as specified allowable fractions of total pressure drop by means of Log-Mean Temperature Difference (LMTD) method. Heat transfer areas, volumes and weights of designed heat exchangers were evaluated. It is shown that, under identical heat duty, fin-and-tube heat exchanger requires 1.8 times larger heat transfer area outside tubes and volume, 0.6 times smaller heat transfer area inside tubes than plate-fin heat exchanger. Under identical total pressure drop, fin-and-tube heat exchanger requires about 5 times larger volume and heat transfer area in gas-side, 1.6 times larger heat transfer area in air-side than plate-fin heat exchanger. Total weight of fin-and-tube heat exchanger is about 2.7 times higher than plate-fin heat exchanger, however, the heat transfer rate of fin-and-tube heat exchanger is about 1.4 times larger than that of plate-fin heat exchanger. It is indicated that, both-sides finned tube heat exchanger may be used in engineering application where the total pressure drop is severe to a small fraction and the operating pressure is high, and may be adopted for recuperator in microturbine.

Thermal Performance of Microencapsulated Phase Change Material Slurry in a Coil Heat Exchanger

Journal of Heat Transfer ◽

10.1115/1.4029819 ◽

2015 ◽

Vol 137 (7) ◽

Cited By ~ 10

Author(s):

Min-Suk Kong ◽

Kun Yu ◽

Jorge L. Alvarado ◽

Wilson Terrell

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Pressure Drop ◽

Phase Change ◽

Thermal Performance ◽

Mass Fraction ◽

Microencapsulated Phase Change Material ◽

Coil Heat Exchanger ◽

Change Material ◽

Coil Heat

An experimental study has been carried out to investigate the convective heat transfer and pressure drop characteristics of microencapsulated phase change material (MPCM) slurry in a coil heat exchanger (CHX). The thermal and fluid properties of the MPCM slurries were determined using a differential scanning calorimeter (DSC) and a rotating drum viscometer, respectively. The overall heat transfer coefficient and pressure drop of slurries at 4.6% and 8.7% mass fractions were measured using an instrumented CHX. A friction factor correlation for MPCM slurry in the CHX has been developed in terms of Dean number and mass fraction of the MPCM. The effects of flow velocity and mass fraction of MPCM slurry on thermal performance have been analyzed by taking into account heat exchanger effectiveness and the performance efficiency coefficient (PEC). The experimental results showed that using MPCM slurry should improve the overall performance of a conventional CHX, even though the MPCM slurries are characterized by having high viscosity.

Numerical Simulation of a Microencapsulated Phase Change Material Slurry Flowing in a Helical Coil Heat Exchanger

Volume 8B: Heat Transfer and Thermal Engineering ◽

10.1115/imece2013-63509 ◽

2013 ◽

Cited By ~ 1

Author(s):

Ehsan M. Languri ◽

Aly H. Shaaban ◽

Minsuk Kong ◽

Jorge L. Alvarado

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Phase Change ◽

Phase Change Material ◽

Heat Exchangers ◽

Helical Coil ◽

Microencapsulated Phase Change Material ◽

Coil Heat Exchanger ◽

Change Material ◽

Coil Heat

Heat transfer analysis of microencapsulated phase change material (MCPM) slurry flowing through a helical coil heat exchanger was carried out numerically. MPCM slurry at different mass fractions with known thermal and physical properties was chosen as heat transfer fluid (HTF). MPCM slurries can carry significantly higher thermal load when the PCM undergoes phase change within a specified temperature range. However, little is known as to how MPCM behave in helical coil heat exchangers. Helical coil heat exchangers are being used widely in many industrial applications including air conditioning systems due to their compactness and high thermal effectiveness. Enhancing the heat transfer rate of coil heat exchanger by using MPCM slurry without altering the existing parameters of coil heat exchangers such as shell diameter should lead to energy savings due to reductions in HTF pumping energy demands at identical heat loads. The ultimate goal of this study is to show a significant enhancement in heat transfer when MPCM slurry is pumped through helical coil heat exchangers. Unlike traditional HTF used in helical coil heat exchangers, the proposed MPCM slurry could alter the flow structure and the internal convection by inducing and enhancing the formation of secondary flows, as a result of phase change in the microencapsulated phase change material. Specifically, a three dimensional numerical study was undertaken to understand the effects of the helical coil heat exchanger geometry and the HTF flow characteristics on heat transfer enhancement. Baseline numerical simulations were conducted using water as HTF in order to compare with MPCM slurry numerical results. The numerical model was solved based on the finite volume method. The temperature-dependent properties of MPCM slurry and boundary conditions were considered. The promising results of this numerical study demonstrate the importance of formulated HTF and the geometry of the heat exchanger on the heat transfer enhancement and energy savings.

A CFD investigation and heat transfer augmentation of double pipe heat exchanger by employing helical baffles on shell and tube side

Thermal Science ◽

10.2298/tsci201120300a ◽

2021 ◽

pp. 300-300

Author(s):

Sobhanadri Anantha ◽

Senthilkumar Gnanamani ◽

Vivekanandan Mahendran ◽

Venkatesh Rathinavelu ◽

Ramkumar Rajagopal ◽

...

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Pressure Drop ◽

Heat Exchangers ◽

The Other ◽

Outlet Temperature ◽

Shell Side ◽

Shell And Tube ◽

Double Pipe ◽

Pipe Heat

The inclusion of baffles in a double pipe heat exchanger is becoming increasingly important as it improves the heat exchanger's performance. CFD analysis is used in this paper to investigate the performance of double pipe heat exchangers with and without helical baffles on both shell tube sides. The 3D Computation Fluid Dynamics (CFD) model was created in Solid Works, and the FloEFD software was used to analyze the conjugate Heat Transfer between the heat exchanger's tube and shell sides. Heat transfer characteristic like Outlet temperature of shell and tube are investigated along with pressure drop on shell and tube side. Based on CFD results of Double Pipe Heat exchanger with helical baffle on both shell side and tube side (Type 4) gives the better results than the other type of heat exchangers with an increased pressure drop than the others, results reveals that type 4 outlet temperature of shell side is 8% higher and on tube side it is 5.5% higher, also pressure drop on shell side is 12% higher and on tube side it is 42% higher than the other types.

Oscillating Heat Transfer Correlations for Spiral-Coil Thermoacoustic Heat Exchangers

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4030171 ◽

2015 ◽

Vol 7 (3) ◽

Author(s):

Kriengkrai Assawamartbunlue ◽

Channarong Wantha

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Heat Exchangers ◽

Transfer Coefficients ◽

Spiral Coil ◽

Heat Transfer Coefficients ◽

Flow Heat ◽

Heat Transfer Correlations ◽

Coil Heat Exchanger ◽

Coil Heat

Heat exchangers are the important parts in thermoacoustic refrigerators. Types and configurations of the heat exchangers affect flow behaviors through stacks, and heat transfer behaviors between working fluids and the heat exchangers. Steady-flow heat transfer correlations to design a heat exchanger are not suitable for the thermoacoustic refrigerators due to their oscillatory flow conditions in resonator tubes. In this paper, a heat transfer correlation for a spiral-coil heat exchanger is presented. The results from the experimental study were used to develop an empirical equation between the Colburn-j factor, the Prandtl number, and the Reynolds number to correlate the oscillating heat transfer coefficient at the spiral-coil heat exchangers. The results showed that using steady-flow heat transfer correlations for analyses and design of the heat exchanger could result in distinguished errors. The heat transfer correlations developed for oscillatory flows on fin heat exchangers are also not suitable to predict heat transfer coefficients for spiral-coil heat exchanger due to difference in flow behaviors on the heat transfer surface. For oscillatory flows, the heat transfer coefficients can be improved by using curved-liked surface such as spiral coil instead of straightlike surface such as fin coil. The relationships between the oscillating heat transfer coefficients at the heat exchangers, drive ratios, and operating frequencies are also presented. Higher drive ratios and operating frequency result in greater heat transfer coefficients.

Evaluation Analysis of Double Coil Heat Exchanger for Heat Transfer Enhancement

Diyala Journal of Engineering Sciences ◽

10.24237/djes.2021.14109 ◽

2021 ◽

Vol 14 (1) ◽

pp. 96-107

Author(s):

Itimad Dawood Jumaah ◽

Senaa Kh. Ali ◽

Anees A. Khadom

Keyword(s):

Heat Exchanger ◽

Water Flow ◽

Flow Rate ◽

Heat Exchangers ◽

Water Flow Rate ◽

Hot Water ◽

Outlet Temperature ◽

Single Coil ◽

Coil Heat Exchanger ◽

Coil Heat

In order to maximize the thermal efficiency of shell and coil heat exchangers, substantial research has been done and geometrical modification is one way to improve the exchange of thermal energy between two or more fluids. One of the peculiar features of coiled geometry is that the temperature distribution is highly variable along the circumferential section due to the centrifugal force induced in the fluid. Moreover, most researchers are concentrated on using a shell and single helical coil heat exchanger to enhance the heat transfer rate and thermal efficiency at different operating parameters. Therefore, the aim of this study is to investigate temperature variation ((T-1, T-2, T-3 and T-4) across a shell and single/double coil heat exchanger at different coil pitches, hot water flow rate, and cold-water flow rate along the outer surface of the coil using experimental and numerical analysis. For single and double coil heat exchangers, Computational Fluid Dynamics (CFD) is carried out using pure water with a hot water flow rate ranging between 1-2 l/min for the coil side heat exchanger. For single coil heat exchangers, the numerical analysis findings showed a good agreement with experimental four-temperature measurement results (T-1, T-2, T-3 and T-4) with an error rate of 1.80%, 3.05%, 5.34% and 2.17% respectively. Moreover, in the current double coil analysis, the hot outlet temperature decreased by 3.07% compared to a single coil (baseline case) at a 2.5L/min hot water flow rate. In addition, increasing the coil pitch will increase the contact between the hot fluid and the coil at a constant hot water flow rate and thereby decrease the hot fluid outlet temperature. Finally, a computational analysis was carried out to examine the flow structure inside single and double coil heat exchangers, and the findings indicated that the effect of centrifugal forces in double coil heat exchangers at various coil pitches caused the secondary flow to be substantially reduced.

Heat Transfer Performance of Different Nanofluids Flows in a Helically Coiled Heat Exchanger

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.832.160 ◽

2013 ◽

Vol 832 ◽

pp. 160-165 ◽

Cited By ~ 16

Author(s):

Mohammad Alam Khairul ◽

Rahman Saidur ◽

Altab Hossain ◽

Mohammad Abdul Alim ◽

Islam Mohammed Mahbubul

Keyword(s):

Heat Transfer ◽

Heat Transfer Coefficient ◽

Heat Exchanger ◽

Pressure Drop ◽

Transfer Coefficient ◽

Friction Factor ◽

Heat Exchangers ◽

Heat Transfer Performance ◽

Volume Concentration ◽

Transfer Performance

Helically coiled heat exchangers are globally used in various industrial applications for their high heat transfer performance and compact size. Nanofluids can provide excellent thermal performance of this type of heat exchangers. In the present study, the effect of different nanofluids on the heat transfer performance in a helically coiled heat exchanger is examined. Four different types of nanofluids CuO/water, Al2O3/water, SiO2/water, and ZnO/water with volume fractions 1 vol.% to 4 vol.% was used throughout this analysis and volume flow rate was remained constant at 3 LPM. Results show that the heat transfer coefficient is high for higher particle volume concentration of CuO/water, Al2O3/water and ZnO/water nanofluids, while the values of the friction factor and pressure drop significantly increase with the increase of nanoparticle volume concentration. On the contrary, low heat transfer coefficient was found in higher concentration of SiO2/water nanofluids. The highest enhancement of heat transfer coefficient and lowest friction factor occurred for CuO/water nanofluids among the four nanofluids. However, highest friction factor and lowest heat transfer coefficient were found for SiO2/water nanofluids. The results reveal that, CuO/water nanofluids indicate significant heat transfer performance for helically coiled heat exchanger systems though this nanofluids exhibits higher pressure drop.

Performance analyses of helical coil heat exchangers. The effect of external coil surface modification on heat exchanger effectiveness

Archives of Thermodynamics ◽

10.1515/aoter-2016-0032 ◽

2016 ◽

Vol 37 (4) ◽

pp. 137-159 ◽

Cited By ~ 16

Author(s):

Rafał Andrzejczyk ◽

Tomasz Muszyński

Keyword(s):

Heat Transfer ◽

Surface Modification ◽

Heat Exchanger ◽

Heat Exchangers ◽

Helical Structure ◽

Nuclear Industry ◽

Helical Coil ◽

Tube Heat Exchanger ◽

High Heat Transfer ◽

Coil Heat

Abstract The shell and coil heat exchangers are commonly used in heating, ventilation, nuclear industry, process plant, heat recovery and air conditioning systems. This type of recuperators benefits from simple construction, the low value of pressure drops and high heat transfer. In helical coil, centrifugal force is acting on the moving fluid due to the curvature of the tube results in the development. It has been long recognized that the heat transfer in the helical tube is much better than in the straight ones because of the occurrence of secondary flow in planes normal to the main flow inside the helical structure. Helical tubes show good performance in heat transfer enhancement, while the uniform curvature of spiral structure is inconvenient in pipe installation in heat exchangers. Authors have presented their own construction of shell and tube heat exchanger with intensified heat transfer. The purpose of this article is to assess the influence of the surface modification over the performance coefficient and effectiveness. The experiments have been performed for the steady-state heat transfer. Experimental data points were gathered for both laminar and turbulent flow, both for co current- and countercurrent flow arrangement. To find optimal heat transfer intensification on the shell-side authors applied the number of transfer units analysis.

Performance Study of Heat Exchangers with Continuous Helical Baffles on Different Inclination Angles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.655-657.461 ◽

2013 ◽

Vol 655-657 ◽

pp. 461-464 ◽

Cited By ~ 1

Author(s):

Su Fang Song

Keyword(s):

Heat Transfer ◽

Heat Transfer Coefficient ◽

Heat Exchanger ◽

Pressure Drop ◽

Transfer Coefficient ◽

Heat Exchangers ◽

Performance Study ◽

Three Dimensional Model ◽

Shell Side ◽

Inclination Angles

The three-dimensional model of heat exchangers with continuous helical baffles was built. The fluid flow dynamics and heat transfer of shell side in the helical baffled heat exchanger were simulated and calculated. The velocity, pressure and temperature distributions were achieved. The simulation shows that with the same baffle pitch, shell-side heat transfer coefficient increased by 25% and the pressure drop decreases by 18% in helical baffled heat exchanger compared with segmental helical baffles. With the analyzing of the flow and heat transfer in heat exchanger in 5 different inclination angles from 11°to 21°, it can be found that both shell side heat transfer coefficient and pressure drop will reduce respectively by 86% and 52% with the increases 11°to 21°of the inclination angles. Numerical simulation provided reliable theoretical reference for further engineering research of heat exchanger with helical baffles.