Helical Coil Heat Exchanger Research Articles

Analytical study of photovoltaic thermal compound parabolic concentrator active double slope solar distiller with a helical coiled heat exchanger using CuO nanoparticles

Analytical study of photovoltaic thermal compound parabolic concentrator active double slope solar distiller with a helical coiled heat exchanger using CuO nanoparticles

Comparative numerical study of flow characteristics in shell & helical coil heat exchangers with hybrid models

The present paper dispenses with effectiveness and energy actions of Shell and Coil heat exchanger used to reject heat from working fluid in industries. In particular, shell and coil heat exchanger had examined for 3 vivid coil configurations, so to examine the flow attributes for these models for common boundary conditions and under varying working operations. Important inference reflected out are rate of heat transfer from heat exchanger and effectiveness for all the three systems. Computations had been formulated using the software Ansys Fluent and it had covered the simulations for all the different working operations separately for all the heat exchangers. The major attribute for rate of heat transfer enhancement of numerical models pointed is the overall heat transfer coefficient which depends on coil thermal conductivity. The value of volume flow rate in tubes were found another essential element. The shell-helical coil heat exchanger arrangement resulted as preferred one over other two heat exchanger due to its consistency while slinky coil can be used for enhanced heat transfer conditions if total pressure drop is not a performance measuring parameter.

The Effect of Injected Air Bubble Size on the Thermal Performance of a Vertical Shell and Helical Coiled Tube Heat Exchanger

In the present study, the effect of injecting air bubble size on the thermal performance of a vertical counter-current shell and coiled tube heat exchanger is experimentally investigated. The experiments were accomplished in ... | Find, read and cite all the research you need on Tech Science Press

EXPERIMENTAL INVESTIGATIONS ON HEAT TRANSFER ENHANCEMENT FOR HORIZONTAL HELICAL COIL HEAT EXCHANGER WITH DIFFERENT CURVATURE RATIOS USING CARBOXYMETHYL CELLULOSE-BASED NON-NEWTONIAN NANOFLUIDS

EXPERIMENTAL INVESTIGATIONS ON HEAT TRANSFER ENHANCEMENT FOR HORIZONTAL HELICAL COIL HEAT EXCHANGER WITH DIFFERENT CURVATURE RATIOS USING CARBOXYMETHYL CELLULOSE-BASED NON-NEWTONIAN NANOFLUIDS

EXPERIMENTAL AND NUMERICAL STUDY OF INSERTING AN INTERNAL HOLLOW CORE TO FINNED HELICAL COIL TUBE-SHELL HEAT EXCHANGER

In the present study, an experimental study and a numerical method are used to simulate the effect of utilizing finned helical coil heat exchanger horizontally oriented with and without internal hollow core inside the shell and monitoring the heat transfer intensification behavior and performance enhancement, by using ANSYS FLUENT 2019R3 package. The working fluid in the inlet side of the coil will be superheated vapor refrigerant (R410a) after the compression stage of the air conditioner (1TR) split type, the working fluid in the shell side is water with various flow rates (1,2 and 3) LPM. Found that when using a heat exchanger with internal hollow core reduces the time needed to reach the steady-state outlet temperature and directly proportional to the size of the core by 20% and slightly increasing the water outlet temperature by 5%.

Optimization of Helical Coil Tube Heat Exchanger: A Systematic Review

Helical coil heat exchanger is used in the food industries, air cooling industries etc.., due to its advantage of structural compact and high heat transfer coefficient. Many existing researches have been carried to improve the heat transfer efficiency and pressure drop. Mathematical model of the heat exchanger has been used to validate the performance of the heat exchanger. This paper involves in review the researches related to the optimization of helical coil tube heat exchanger. Some of the optimization methods such as Taguchi method, Genetic Algorithm (GA) and Multi-Objective Genetic Algorithm (MOGA) is used. From the analysis, Artificial Neural Network (ANN) and GA method has efficient performance in modelling and optimization of heat exchanger. Although, some methods involved in economic optimization of heat exchanger and these method has lower performance.

Exergy analysis of Shell and helical coil heat exchanger and design optimization

In this study, experimental investigations and exergy analysis on shell and helically coiled tube heat exchanger are carried out for free convection heat transfer. The measured data are totally optimised utilizing thermodynamics rules in which exergy study is performed to investigate the thermal performance of the helical system under different operating conditions. The experimental set-up of apparatus are designed and made for cold water and hot water as a working fluid of both the shell side and helical coil side, respectively. The effects of several parameters such as geometry and operational conditions on the exergy destruction and dimensionless exergy destruction are investigated. The counter flow direction is considered under the steady state flow condition, and the critical Reynolds number was more than 4000 in this study. The main objective of this work was to clarify the effect of the volume flow rates and inlet temperatures of hot water and cold water in the shell and helical coil on exergy efficiency and pressure drop. Results showed that the exergy destruction and dimensionless exergy destruction decrease with the increase of coil pitch and Dean number. In contrast, the exergy destruction and dimensionless exergy destruction are obviously increased with the hot water flow rates or cold water flow rates. These exergy characteristics are also augmented with the values of hot water inlet temperatures and cold water inlet temperatures. The pressure drop is considerably increased with the increase of Dean number and reduced with the increase of coil diameter. While, the exergy efficiency steadily increases with the decrease of the cold water flow rates and with the increase of Dean number.

Experimental shell-side surface pressure measurements on tubes within a model helical coil heat exchanger

The tube and shell Helical Coil Heat Exchanger (HCHX) geometry, also known in multiple industries as the Coil-wound (CWHE), and Spiral-wound heat exchanger (SWHE), has recently been under greater investigation due to the interest in cryogenic, solar, and nuclear industry applications. Helical Coil Steam Generators (HCSGs) have adjacent tube bundles that coil in opposite directions at different helical pitches. While this design is known to increase heat transfer and provide a higher volumetric efficiency, few studies look at the changes the coiling arrangement has on forces acting on the tube. This study investigates the pressure on the surface of the tubes in this complex type of cross-section arrangement as compared to standard tube bundle arrangements. Experiments were conducted at Reynolds Numbers 8500 and 11,700 based on tube diameter and free-stream velocity. Pressure Sensitive Paint (PSP) was used on the shell-side surface of the tubes along with dynamic pressure sensors to visualize tube surface pressure and measure pressure fluctuations. Instantaneous pressure analysis using PSP and dynamic pressure transducers showed agreement with peaks of transient pressure fluctuations at approximately 9.8, 19.7 and 27.5 Hz. Previous studies have grouped tube surface pressure based on geometric parameters such as lateral pitch ratio, while the analysis of the pressure fields from this geometry showed pressure profiles unique to individual planes regardless of equivalent lateral pitch ratio.

Performance analysis of a high-temperature magnesium hydride reactor tank with a helical coil heat exchanger for thermal storage

Metal hydrides are regarded as one of the most attractive options for thermal energy storage (TES) materials for concentrated solar thermal applications. Improved thermal performance of such systems is vitally determined by the effectiveness of heat exchange between the metal hydride and the heat transfer fluid (HTF). This paper presents a numerical study supported by experimental validation on a magnesium hydride reactor fitted with a helical coil heat exchanger for enhanced thermal performance. The model incorporates hydrogen absorption kinetics of ball-milled magnesium hydride, with titanium boride and expanded natural graphite additives obtained by Sievert's apparatus measurements and considers thermal diffusion within the reactor to the heat transfer fluid for a realistic representation of its operation. A detailed parametric analysis is carried out, and the outcomes are discussed, examining the ramifications of hydrogen supply pressure and its flow rate. The study identifies that the enhancement of thermal conductivity in magnesium hydride has an insignificant impact on current reactor performance.

Exergetic performance of the helically coiled tube heat exchangers: Comparison the sector-by-sector with tube in tube types

The exergy analysis is performed for the flow of fluid and transfer of thermal energy inside the sector-by-sector (SBS) and tube-in-tube (TIT) types of the helically coiled heat exchangers (HCTHs). The turbulent transfer of thermal energy for each side of the heat exchangers is simulated using the Realizable K-epsilon model. The model is verified by comparing the current work values of the Nusselt numbers with the values obtained using the previous empirical correlations. New equations are suggested for the estimation of the exergy efficiency and the coefficient of the exergy performance as functions of the both sides Reynolds numbers, dimensionless coil diameter and pitch. These heat exchangers performance are compared using these equations. It was concluded that, if the dimensionless coil diameter is doubled, the exergy efficiency decreases by 21.8%, 25.7% and 21.1% and the coefficient of the exergy performance decreases by 8%, 9.3% and 14.8% for the heat exchangers with semi-circle cross section, quadrant-circle cross section and the TIT heat exchangers, respectively. Furthermore, the application of the SBS heat exchangers with semi-circle and quadrant-circle cross sections are highly recommended instead of the common TIT types.

Review of heat transfer enhancement on helical coil heat exchanger by additive passive method

A Helical coil Heat exchanger is a type of equipment built for reducing the space of heat exchanger without reducing its length of the tube. The heat carrier enrichment ways for swirl coil heat exchanger are widely applied in Test Cooling, Experimental Pre-moderate, complete moderators, Condensers, Ultracool Vaporizers, Compressor, Other Moderators and Wide Uses. The heat carrier enrichment is splits into Active way and Passive way. Enriching the heat carrier by the utilization of vertically coiled swirl tubes have been considered and experimented by several researchers to increase its efficiency by several ways. Here we are investigating the enrichment of heat carrier, passive way by using the different fluids to the swirl coil heat exchanger.

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Computational investigations on helical heat flow exchanger in automotive radiator tubes with computational fluid dynamics

The Present work is employed to heat transfer from one fluid in a pipe in different wavy paths is named as helical coiled heat exchanger. The heat exchanger features a wide use in burning engine as radiator. It’s used for alternative functions like area heating, fossil fuel process, power stations, fossil oil refineries, air con, power stations, organic compound plants, refrigeration, and waste matter treatment. During this we have a tendency to be aiming to associate degree analysis the exchange of warmth transfer co-efficient and temperature between two fluids mistreatment turbinate tubes as heat exchanger. Tests have used circular and rectangular cross section for the tubes. The comparison of various section and CFD analysis is distributed mistreatment computer code like Ansys, and solid works.

Condensation Heat Transfer of R-407C in Helical Coiled Tube Heat Exchanger

The results of an experimental study to evaluate the characteristics of R-407C thermofluid during condensation in a helically coiled copper tube heat exchanger are presented. The effects of saturation temperature (Tsat), and mass and heat fluxes of refrigerant R-407C on thermal performance and pressure drop were determined. The relationship between the refrigerant wall subcooling and heat transfer coefficients was also investigated. This paper reports the effect of the temperature of the water used as cooling medium on the heat transfer rate of condensing R-407C. The study was conducted with mass flux of R-407C in the range of 100–450 kg/m2s, mass flux of the coolant water in the range of 500–5000 kg/m2s and Tsat of 31 °C, 35 °C, and 39 °C. Compared with a straight smooth tube, the use of the helical coiled (helicoidal) tube increased the condensation rate with a corresponding pressure drop that depended on the value of Tsat of the refrigerant and temperature of the coolant.

Experimental and CFD investigation of helical coil heat exchanger with flower baffle

The objective of this invention is to increase the resident time of coolant in the shell side of the helical coil heat exchanger by using flower baffle plates. This invention utilized to improve the heat transfer efficiency of the helical coil heat exchanger. The heat exchanger contains a hollow shell and helical coil as same as in a normal shell, In addition to it contains a flower baffle plate. The baffle plates are placed inside the shell side of heat exchanger in distance between two coils. These baffle plates arrange to reduce the pressure drop and fouling in heat exchanger with these arrangements of baffle plates, the heat exchanger can obtain a fully developed flow . The hot fluid flows through the helical coil in heat exchanger. The tube side flow rates varies from 2lpm to 6 lpm and shell side flow rates (2, 4, 5, 6, 8 lpm), respectively. The experiment is done for all the 10 cases to find the effective one. Also done the CFD analysis to validate the experiment values, the CFD results are good in agreement with the experiment results within an error percentage of 15%. The outlet temperature of the tube and shell side, effectiveness and exergy efficiency of heat exchanger also calculated and presented graphically.

Design And Analysis of Helical Coil Heat Exchanger

Heat exchangers has been widely used in power plants and industries for heating or cooling applications. Heat is transferred from one medium to another medium by using heat exchangers. Helical coil heat exchangers with two different shell configurations are designed. First shell configuration with a central core and second without a central core. Both the configurations has a copper helical coil. Designing of heat exchangers is done with counter flow arrangement by using CATIA V5 R2015. The performance of both the configurations are analysed and compared by using Fluid flow (Fluent) in ANSYS WORKBENCH 18.1 for CFD simulations. Further the helical tube materials Copper and Aluminium which are widely used in heat exchangers are also analysed in shell with core configuration and heat transfer rates are also compared using CFD (Fluent) analysis.

Performance Analysis of Heat Transfer Parameters in Shell and Tube Heat Exchanger with Circumferential Turbulator

Performance of heat exchanger is evaluated by the value of heat transfer coefficients, Reynolds number, Nusselt number, temperature distribution along the length, residence time and pressure drop. Improving these parameters for better performance is the main focus in designing the heat exchanger. In that view, helical coil gives more turbulence to the fluid flowing through it that leads to improved tube side heat transfer coefficient. For increasing the turbulence in cold flow, turbulators can be used in the circumferential area between helical coil and shell. In this work, heat transfer rate of shell and helical coil heat exchanger is improved by using circumferential turbulators. For the same mass flow rate of cold fluid different hot fluid mass flow rates (0.03 kg/s, 0.06 kg/s, 0.09 kg/s and 0.12 kg/s) were fixed for taking readings and the improvement is obtained by calculation of performance parameters. The temperature distribution along the length of the heat exchanger is plotted for different flow rates. Results show that, increasing the mass flow rate of cold fluid above the mass flow rate of hot fluid decreases the performance.

Solution of conjugate problem in a conical coil heat exchanger

Today, coil heat exchangers are widely used in various industries. A large number of works have been published devoted to the study of the characteristics of helical coil heat exchangers. According to the authors, conical coil heat exchangers have higher efficiency compared to helical ones. The article investigates the influence of the geometric parameters of conical coil heat exchangers on their effectiveness. The object of study is a conical coil heat exchanger with different tube diameters of the inner coil (di = 13, 15, 17 mm) and various number of turns (N = 6, 10, 14). Modeling was carried out in the Ansys Fluent software package. For each combination of the parameters, data were obtained on the temperature and velocity of the coolant at the outlet. It was found that a change in the number of turns by a factor of 2.3 leads to an increase in the temperature of the heated fluid by an average of 9.7 ° C. The effect of changing the diameter of the inner coil is non-linear.

Numerical evaluation and the effects of geometrical and operational parameters on thermal performance of the shell and double coil tube heat exchanger

AbstractHeat exchangers are extensively used in various industries. In this study, the impact of geometric and flow parameters on the performance of a shell and double helical coil heat exchanger is studied numerically. The investigated geometric parameters include external coil pitch, internal coil pitch, internal coil diameter, and coil diameter. The influences of considered geometrical parameters are analyzed on the output temperature of the hot and cold fluid, convective heat transfer coefficient, pressure drop, and average Nusselt number. Water is considered as working fluid in both shell and tube. As an innovation, double helical coils are used instead of one in the heat exchanger. To compare the obtained results accurately, in each section, the heat transfer area (coil outer surface) is kept constant in all models. The results show that the geometrical parameters of double helical coils significantly affect the heat transfer rate.

Design and Optimization of Heat Transfer in Double Helical Concentric Coil Heat Exchanger

Due to the compact structure and high heat transfer coefficient, helical coil heat exchangers find extensive use in industrial applications such as power generation, nuclear industry, process plants, heat recovery systems, refrigeration, food industry, etc. Helical coils are used for transferring heat in chemical reactors and agitated vessels because heat transfer coefficients are higher in helical coils. Standard helical coil heat exchanger has some drawbacks out of which pressure drop is major concern. In this paper effort has been made to calculate effectiveness of a new design of double helical concentric coil and the results are compared with standard double helical concentric coil at different pitch.