Shell Type Heat Exchanger Research Articles

Investigation on performance of bio synthesized copper nano fluid in helical coil and shell type heat exchanger

Tulsi leaf extracts has been used to produce biosynthesized copper nanoparticles. This biosynthesized nanoparticle is used for the preparation of nanofluid. The performance of nanofluid in a helical coil heat exchanger was studied for heat transfer rate and analyzed using standard correlation at the laboratory of NIT, Raichur. The fluid inlet temperature of the coil was 60 °C and temperatures of fluid inside a shell of 32 °C were maintained. A dean number in the range of 1000 – 10,000 was set on the shell side. The inlet fluid flow was constant at the coil. Thermal analysis has been carried out considering flow rate, overall heat transfer coefficient, and inlet and outlet temperature. When compared to the base fluid, using bio-synthesized Nanoparticles improved the heat transfer coefficient.

Experimental Analysis of the Latent Heat Storage System (LHS) Using Paraffin Wax as Phase Change Material

An experimental study using paraffin wax as a phase change material (PCM) was performed to analyse thermal physiognomies on the latent heat storage system (LHS). The use of phase change materials through latent heat storage is an unusual approach to maintaining thermal energy. There is the advantage of considerably high energy storage and the uniform temperature of the storage process. Tube & shell type heat exchanger (HE) has been used in this experimentation. Water circulates in tubes and around the tube’s paraffin wax as phase change material is filled. The focus is on heating (charging) and cooling (discharging) of PCM (paraffin wax), which is the melting and solidifying of paraffin wax. The temperature distribution in paraffin is studied consistent with the various flow rates of the warmth transfer fluid.

Numerical modelling of a parallel flow heat exchanger with two-phase heat transfer process

In this analysis a 1-D steady state heat transfer was accomplished for tube and shell type heat exchanger with parallel flow configuration. Molten salt was regarded as a secondary flow that runs in the shell part of the heat exchanger whereas the saturated water was regarded as the primary flow that flows in the tube part of heat exchanger. The analysis is done for 0.1 kg/s mass flow rate of the primary flow and for various mass flow rate of the secondary flow ranging from 0.1 kg/s to 0.6 kg/s. The heat exchanger's thermal characteristics, such as, variation in steam quality and two-phase convective coefficient of the saturated water alongside the length of the tube are collected from the analysis. In addition, temperature profiles for primary and secondary flows are presented in this article. It is found that for the considered geometry of the heat exchanger and the boundary conditions, a 0.376 kg/s mass flow rate of molten salt is required to convert the 0.1 kg/s mass flow rate of primary flow into saturated steam. As a result, a mass flow rate of molten salt which is greater than 0.376 kg/s is required to super heat the primary fluid (water).

Effect of various phase change materials (paraffin wax/hydrogenated vegetable oil) packed in a fabricated shell and tube type heat exchanger

Researchers are often trying to find out the various renewable energy sources to continuously feed the growing energy demands as well as storing the generated energy with appropriate known technology. In line of the above, in order to store the energy, phase changing material (PCM) playing the major role. The phase changing materials exhibit better efficiency due to its energy storage capacity, and keep supplies constant thermal energy when need arises. Normally the characteristics of the phase change materials are charging, storing and following this, final step is discharging the heat to the selected medium through the phase changing materials and the same could be used for many applications starts from domestic to industrial spectrum. In this present study, the paraffin wax and hydrogenated vegetable oil have been used as the phase changing materials. To experimentally analyze the coefficient of thermal expansion of the phase changing material, the tube and shell type heat exchanger have been used. Similarly the efficiencies of the thermal energy storage (TES) capacity of the subjected material have been verified, with the intention of employ the same system for the applications like cold storage plant, refrigeration, domestic heating and automobile sectors.

Condensation frictional pressure drop characteristic of R-600a inside the horizontal smooth and dimpled helical coiled tube in shell type heat exchanger

In this paper, an experimental study on condensation frictional pressure drop of R-600a inside smooth and dimpled helical coiled tubes were examined. The experiments were performed at saturation temperature of 35 °C, and 45 °C with mass fluxes of 75, 115, 156 and 191 kg m−2s −1. The effect of vapor quality, mass flux and saturation temperature on the frictional pressure drop were inspected. Moreover, the results obtained from smooth and dimpled helical coiled tube were also compared from those smooth straight tube at same operating condition. The results showed that the dimpled helical coiled tube offers higher frictional pressure drop compared to the smooth straight tube and smooth helically coiled tube. Finally, the correlations have been proposed to predict the frictional pressure drop during condensation of R-600a inside smooth and dimpled helically coil tube that predict the data within ±20%.

A Review on PCM Heat Exchanger Using Paraffin Wax

The main aim of our project is experimentally investigating the feasibility of an expanded paraffin wax phase change material (PCM) heat exchanger operating as a condenser in an instant air source. The temperature distribution and volume expansion of an expanded paraffin wax were investigated and tested under different inlet water flow rates. However, in the PCM heat charging/discharging process, non-uniform temperature distributions played an important role in the heat exchanger efficiency. During the heat discharging process, the energy efficiency and the heat transfer rate were also analyzed using experimental data. The use of phase change materials through latent heat storage is an unusual approach to maintaining thermal energy. Heat exchanger with PCM provides benefit of high energy storage density and the equal temperature of the storage process. A tube in shell type heat exchanger is use. Water circulates in tubes of heat exchanger and around it has paraffin wax as phase change material.

Two-phase flow condensation heat transfer characteristic of R-600a inside the horizontal smooth and dimpled helical coiled tube in shell type heat exchanger

This paper presents an experimental study on condensation heat transfer of R-600a inside smooth and dimpled helical coiled tubes. The experiments were executed at saturation temperature of 35°, and 45 °C with mass fluxes of 75, 115, 156 and 191 kg m−2s−1. The effect of vapor quality, mass flux and saturation temperature on the heat transfer coefficient is examined. The experiments have been carried out for smooth and dimpled helical tube. The dimpled helical coiled tube showed higher heat transfer coefficient compared to the smooth helically coiled tube. The heat transfer data of R-600a are compared with R-134a from a previous study with the same operating condition for both tubes. We developed correlations to predict the condensation heat transfer coefficients in smooth and dimpled tubes that predict data within ±20%.

THREE DIMENSIONAL NUMERICAL SIMULATION OF SHELL-AND-TUBE HEAT EXCHANGERS. PART I: FOUNDATION AND FLUID MECHANICS

A three-dimensional, colocated, fully implicit, control volume based calculation procedure, HEATX[1], has been used to simulate fluid flow and heal transfer in shell-and-tube heat exchangers. The three-dimensional numerical model uses the distributed resistance method along with volumetric porosities and surface permeabilities to model the tubes in the heat exchanger. Turbulence effects are modeled using a modified k-ϵ model with additional source terms for turbulence generation and dissipation by tubes. Shell and baffle walk are modeled using the wall function approach. Tubes and baffles are modeled using volumetric porosities and surface permeabilities. Baffle-shell and baffle-tube leakages are modeled using a Bernoulli type formulation. Specialized geometry generators compute baffle, nozzle, and tube region porosities and permeabilities. This article presents the foundation and fluid mechanics of the problem. A subsequent article will discuss modeling of shell-side and tube-side heat transfer. The three-dimensional numerical model is validated by comparison of computed pressure drops with the experiments conducted at Argonne National Labs [2] in E shell type heat exchangers. The effect of baffle cut and baffle spacing on the pressure drop is studied. Good agreement is obtained between the computed results and the experiments.