scholarly journals Calculation of a Two-Tube Heat Exchanger with Preliminary Heating of a Binary Mixture in Rectification Processes

2021 ◽  
Vol 136 (5) ◽  
pp. 48-52
Author(s):  
A. B. Golovanchikov ◽  
◽  
N. A. Prokhorenko ◽  
Keyword(s):  
Heat Exchanger ◽  
Working Capital ◽  
Pipe Length ◽  
Preliminary Heating ◽  
Tube Heat Exchanger ◽  
Central Tube ◽  
Economic Parameters ◽  
Calculation Results ◽  
Inner Diameter ◽  
Pipe Heat

A typical algorithm for calculating a two-pipe heat exchanger is supplemented with technical and economic parameters related to annual costs for electricity, depreciation costs for equipment and working capital for repairs and maintenance. An example of the calculation with heating of the oil stream before distillation of the bottom heavy fraction obtained at the outlet of the column is given. The calculation results are presented in the form of dependencies of the main technical and economic parameters: hydraulic resistance, pump power, pipe length on the central tube inner diameter, in which heated crude oil moves counter currently with the bottom of the bottom of the bottom fluid.

scholarly journals Effect of pile and heat exchanger properties on total heat extraction of an energy pile - A numerical study

2020 ◽  
Vol 205 ◽  
pp. 05024
Author(s):  
Mithun Mandal ◽  
Ramakrishna Bag
Keyword(s):  
Heat Exchanger ◽  
Geothermal Energy ◽  
3D Model ◽  
Total Heat ◽  
Heat Extraction ◽  
Soil Layers ◽  
Energy Pile ◽  
Tube Heat Exchanger ◽  
Concrete Pile ◽  
Inner Diameter

Geothermal energy is one of the potential energy resources to meet future energy demand keeping environmental pollution under control. This paper presents the use of geothermal energy for space heating from energy pile. An energy pile with a single U tube heat exchanger of polyethylene (PE) pipe was modeled in this study. The effect of pile and heat exchanger properties on the total heat extraction was studied by the finite element analysis using COMSOL Multiphysics. The 3D model was developed and validated based on the literature reported results of an experimental thermal performance of a borehole equipped with a single and double U tube heat exchanger. Tetrahedral elements were considered for simulation of a 3D model. The model of a single energy pile of certain dimensions with different soil layers was considered, each soil layers were associated with different temperature. The effect of various parameters such as the length of concrete pile, the diameter of concrete pile, the thickness of U pipe, the inner diameter of U pipe and velocity of fluid inside the U pipe on amount of heat extraction was studied for an energy pile equipped with a single U tube heat exchanger. It was observed that the most influential parameters in increasing the outlet temperature of the heat exchanger loop are the diameter of the concrete pile, the inner diameter of U pipe and the velocity of fluid inside the U pipe.

scholarly journals Thermal-economic multiobjective optimization of heat pipe heat exchanger for energy recovery in HVAC applications using genetic algorithm

2014 ◽  
Vol 18 (suppl.2) ◽  
pp. 375-391 ◽  
Author(s):  
Sepehr Sanaye ◽  
Davood Modarrespoor
Keyword(s):  
Genetic Algorithm ◽  
Heat Exchanger ◽  
Heat Pipe ◽  
Operating Cost ◽  
Design Parameters ◽  
Nsga Ii ◽  
Pipe Length ◽  
Total Cost ◽  
Continuous And Discrete Variables ◽  
Pipe Heat

Cost and effectiveness are two important factors of heat pipe heat exchanger (HPHE) design. The total cost includes the investment cost for buying equipment (heat exchanger surface area) and operating cost for energy expenditures (related to fan power). The HPHE was thermally modeled using e-NTU method to estimate the overall heat transfer coefficient for the bank of finned tubes as well as estimating pressure drop. Fast and elitist non-dominated sorting genetic algorithm (NSGA-II) with continuous and discrete variables was applied to obtain the maximum effectiveness and the minimum total cost as two objective functions. Pipe diameter, pipe length, numbers of pipes per row, number of rows, fin pitch and fin length ratio were considered as six design parameters. The results of optimal designs were a set of multiple optimum solutions, called ?Pareto optimal solutions?. The comparison of the optimum values of total cost and effectiveness, variation of optimum values of design parameters as well as estimating the payback period were also reported for various inlet fresh air volume flow rates.

MgH2–TiF4-MWCNTs based hydrogen storage tank with central tube heat exchanger

2019 ◽  
Vol 44 (36) ◽  
pp. 20173-20182 ◽  
Author(s):  
Sophida Thiangviriya ◽  
Praphatsorn Plerdsranoy ◽  
Chongsutthamani Sitthiwet ◽  
Palmarin Dansirima ◽  
Puttimate Thongtan ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Hydrogen Storage ◽  
Storage Tank ◽  
Tube Heat Exchanger ◽  
Central Tube

scholarly journals Optimization of Earth Air Tube Heat Exchanger for Cooling Application Using Taguchi Technique

2020 ◽  
Vol 38 (4) ◽  
pp. 845-862
Author(s):  
Saif Nawaz Ahmad ◽  
Om Prakash
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Transfer Coefficient ◽  
Pipe Material ◽  
Ground Heat Exchanger ◽  
Tube Heat Exchanger ◽  
Overall Heat Transfer Coefficient ◽  
The Earth ◽  
Inner Diameter

Earth air tube heat exchanger (EATHE) is one of the passive technologies which utilize the earth stored heat (renewable energy) for heating/cooling the buildings. EATHE releases heat to earth for cooling space in summer, making the earth a heat sink and extracts earth-stored energy for heating space in winter and makes the earth a heat source. This paper optimizes the Length of the ground heat exchanger and overall heat transfer coefficient of earth air heat exchanger using the Taguchi technique for cooling application. For this purpose, we select six factors such as installation depth of Pipe (A), Pipe's inner diameter (B), Thermal conductivity of pipe material (C), Inlet air temperature (D), Outlet air temperature (E), Inlet air velocity (F). All these factors are taken at three levels, and we select an L27 orthogonal array for experimental runs. The ground heat exchanger's Length and the overall heat transfer coefficient were then calculated for each experimental run. In the Taguchi method, we find the signal to noise ratio for an optimal combination of all six factors and ANOVA to find the order of influencing parameters and their percentage contributions for both the objective parameters. According to our results, the best combination for all the six factors for ground heat exchanger length and overall heat transfer coefficient were A1B1C3D1E3F1 and A2B3C2D3E1F3, respectively. The highest and lowest influencing factors for ground heat exchanger length were the pipe's inner diameter and the pipe's installation depth with their contribution factors of 69.12 and 0.32%, respectively. In contrast, the highest and lowest influencing factors for the overall heat transfer coefficient were the pipe's inner diameter and thermal conductivity of pipe material with their contribution factors of 75.97and 0%, respectively. Hence the order of influence of all the six factors for both the objective parameters was BEFDCA.

Effect of vibrator position and frequency on heat transfer enhancement in counter flow concentric pipe heat exchanger

2020 ◽  
Vol 17 (5) ◽  
pp. 751-760
Author(s):  
Shanmukh Sudhir Arasavelli ◽  
Ramakrishna Konijeti ◽  
Govinda Rao Budda
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Heat Exchanger ◽  
Heat Transfer Enhancement ◽  
Hot Water ◽  
Transfer Enhancement ◽  
Counter Flow ◽  
Pipe Length ◽  
Content Type ◽  
Pipe Heat

Purpose This paper aims to deal with heat transfer enhancement because of transverse vibration on counter flow concentric pipe heat exchanger. Experiments were performed at different vibrator positions with varying amplitudes and frequencies. Design/methodology/approach Tests are carried out at 4 different vibration frequencies (20, 40, 60 and 100 Hz), 3 vibration amplitudes (23, 46 and 69 mm) and at 3 vibrator positions (1/4, 1/2 and 3/4 of pipe length) with respect to hot water inlet under turbulent flow condition. Findings Experimental results indicate that Nusselt number is enhanced to a maximum extent of 44% with vibration when compared to Nusselt number without vibration at a frequency of 40 Hz, an amplitude of 69 mm and at a vibrator position of one-fourth of pipe length with respect to hot water inlet. Originality/value Empirical correlation is developed from experimental data to estimate the heat transfer coefficient with vibration for experimental frequency range with an error estimate of approximately ±10%.

Turbulent flows in a spiral double-pipe heat exchanger

2019 ◽  
Vol 30 (1) ◽  
pp. 39-53 ◽  
Author(s):  
Zhe Tian ◽  
Ali Abdollahi ◽  
Mahmoud Shariati ◽  
Atefeh Amindoust ◽  
Hossein Arasteh ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Turbulent Flows ◽  
Heat Exchangers ◽  
Volume Fraction ◽  
Inlet Temperature ◽  
Content Type ◽  
Tube Heat Exchanger ◽  
Double Pipe ◽  
Pipe Heat

Purpose This paper aims to study the fluid flow and heat transfer through a spiral double-pipe heat exchanger. Nowadays using spiral double-pipe heat exchangers has become popular in different industrial segments due to its complex and spiral structure, which causes an enhancement in heat transfer. Design/methodology/approach In these heat exchangers, by converting the fluid motion to the secondary motion, the heat transfer coefficient is greater than that of the straight double-pipe heat exchangers and cause increased heat transfer between fluids. Findings The present study, by using the Fluent software and nanofluid heat transfer simulation in a spiral double-tube heat exchanger, investigates the effects of operating parameters including fluid inlet velocity, volume fraction of nanoparticles, type of nanoparticles and fluid inlet temperature on heat transfer efficiency. Originality/value After presenting the results derived from the fluid numerical simulation and finding the optimal performance conditions using a genetic algorithm, it was found that water–Al2O3 and water–SiO2 nanofluids are the best choices for the Reynolds numbers ranging from 10,551 to 17,220 and 17,220 to 31,910, respectively.

scholarly journals A Review on The CFD Analysis of Nano Water Fluid On Helically Coiled Double Tube Heat Exchanger

2019 ◽  
Vol 5 (10) ◽  
pp. 3
Author(s):  
Sunil Kumar ◽  
Ravindra Mohan
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
Future Research ◽  
Thermal Systems ◽  
Tube Heat Exchanger ◽  
Compact Heat Exchangers ◽  
Shell And Tube ◽  
Double Pipe ◽  
Nano Fluids ◽  
Pipe Heat

Heat exchanger is an important device which is used in thermal systems in many industrial fields. Nano fluids are recently employed as coolants to improve the efficacy of heat exchangers. Regarding unique characteristics of Nano fluids, research studies in this area have witnessed a remarkable growth. Latest investigations conducted on use of Nano fluids in heat exchangers including those carried out on plate heat exchangers, double pipe heat exchangers, shell and tube heat exchangers, and compact heat exchangers are reviews and summarized. Meanwhile, some very interesting aspects of Nano fluids in combination with heat exchangers are presented.  The challenges and prospects for future research are presented in this paper.

CFD Based Study on an Earth Pipe Heat Exchanger With Different Pipe Geometries

2016 ◽  
Author(s):  
Shashank Srivastava ◽  
Aashish Sharma ◽  
Ketan Ajay
Keyword(s):  
Heat Exchanger ◽  
Energy Sources ◽  
Ground Heat Exchanger ◽  
Cfd Modelling ◽  
Tube Heat Exchanger ◽  
Heating And Cooling ◽  
Effective Performance ◽  
Extended Surface ◽  
Day To Day Operations ◽  
Pipe Heat

Heating and cooling is a prime need for various day to day operations and one of the most basic requirements is space conditioning. A huge amount of energy all across the globe is being used for this purpose using various conventional & non-conventional energy based resources. But environmental problems, fast depletion nature and high prices associated with the use of conventional energy sources is becoming a big problem, due to which promotion of non-conventional energy sources becomes important. The use of an in-ground heat exchanger is a unique technique for space conditioning with reduced energy consumption. A lot of research and studies have been done on the design of such systems. This paper presents a study based on the CFD modelling and simulation to analyze the effect on the effective performance of the system by varying the geometry of ducts and using the extended surface to increase the heat transfer rate. Also, a comparative study of performance of earth tube heat exchanger for different cross section of ducts is also presented.

Sign in / Sign up

Export Citation Format

Share Document