Experimental study of effects of baffle helix angle on shell-side performance of shell-and-tube heat exchangers with discontinuous helical baffles

A downhole electric heater, which reduces heat loss along a heat insulation pipe, is a key apparatus used to ignite oil shale underground. Downhole heaters working together with packers can improve the heating efficiency of high-temperature gases, while different packer locations will directly affect the external air temperature of the heater shell and, subsequently, the performance and total cost of the downhole heaters. A device was developed to simulate the external conditions of heater shells at different packer locations. Then, the effects of external air temperature on the performance of a downhole heater with pitches of 50, 160, and 210 mm were experimentally studied. In the test, results indicated that the heater with a packer at its outlet had an accelerated heating rate in the initial stage and decreased temperature in the final stage. Additionally, the lowest heating rod surface temperature and highest comprehensive performance were achieved with minimal irreversible loss and lower total cost when using a downhole electric heater with a packer set at its outlet. In addition, the downhole electric heater with a helical pitch of 50 mm and a packer at its outlet was more effective than other schemes in the high Reynolds number region. These findings are beneficial for shortening the oil production time in oil shale in situ pyrolysis and heavy oil thermal recovery.

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“…The minimal free-flow area (A min ) at the shell center line is expressed by the following equation [14]:…”

Section: Heat Transfer Equationsmentioning

confidence: 99%

“…S gen t in P e (24) Entransy dissipation is the loss of heat transfer potential during the heat transfer process and can be used to evaluate its irreversibility [9,14]. The entransy dissipation resulting from airflow friction is calculated as [27]:…”

Section: S Gen∆tmentioning

confidence: 99%

Effects of Packer Locations on Downhole Electric Heater Performance: Experimental Test and Economic Analysis

et al. 2020

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“…In 2015 Bin Gao et al [23] analyzed the effects of flow resistance and heat transfer of several shell-and-tube heat exchangers with discontinuous helical baffles and compared with five different helix angle. The second-law of thermodynamics was employed to analyze these effects on the irreversible loss of heat exchangers.…”

Section: Literature Reviewmentioning

confidence: 99%

An effective krill herd based optimal NN for parameter evaluation in Shell-And-Tube heat exchangers

Roy¹,

Majumder²

2018

IJHT

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Helical baffles are employed increasingly in shell-and-tube heat exchangers for their significant advantages in reducing pressure drop, vibration, and fouling while maintaining a higher heat transfer performance. In order to make good use of helical baffles, serial improvements have been made by many researchers. In this paper create model of optimal NN for prediction analysis in parameters compared to existing works. This hidden layer and neuron optimization process fish asked KHO technique used. For more verification, KHO is applied to six design problems reported in the literature. Further, the performance of the KH algorithm is compared with that of various algorithms representative of the state-of-the-art in the area. The results of different algorithms are breaking down and stood out from comparative systems, and the finest results rising out of them are discovered by standing out the results from least MSE values. From the results our proposed method achieves minimum MSE compared to existing works and maximum prediction accuracy in optimization model.

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“…The basic equation for the average calculating of coefficient of heat transfer at shell side is shown with the following relation i j i kl m ℓ m n m o m p (14) in which i kl is the ideal of The coefficient of heat transfer for fully cross-flow with ideal tube bundle and is shown with the following relation:…”

Section: The Coefficient Of Heat Transfer At the Shell Sidementioning

confidence: 99%

Optimization of Heat Recovery for Shell & Tube Exchangers in Sulphur Granulation Unit of South Pars Fifth Refinery by Software, ASPEN B-JAC

Moaveni¹

2017

AJMIE

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Shell and tube heat exchangers are the most important tools in heat transfer process. Optimization efficiency of these tools is always the goal of designers. Now a day there are a lot of efficient methods for selecting the best heat exchanger, such as analytic and numerical methods that everyone has advantages and defects. For example, confront of jamming in calculations by receiving to the local minimums and errors during interruption quantities. Today by entering of simulation and design softwares in industries, the simulation of process tools is so simple. the procedure of studies in this thesis is in these steps: first simulation of sulfur solidification heat exchangers in ASPEN B-JAC software same as operation conditions and then evaluation the effects of changing the design parameters in tube bundle section such as number of passes, arrangement of tubes, number of baffles,…. the sulfur solidification package' heat exchanger that it's active fluid is demine water for cooling of package will be optimized till the rate of exchanged heat increases to 15 percent and pressure drop will not affect the operation conditions. The most important note in the correction of tube bundle is that the heat exchanger should be out of service and stopping of production, on the other hand changing in shell of heat exchanger needs to change the piping system and redesign of supports that will spend a lot of time for shut down of plant, so it is out of order for this thesis and optimization of tube bundle will be done.

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Experimental study of effects of baffle helix angle on shell-side performance of shell-and-tube heat exchangers with discontinuous helical baffles

Cited by 82 publications

References 30 publications

Effects of Packer Locations on Downhole Electric Heater Performance: Experimental Test and Economic Analysis

Effects of Packer Locations on Downhole Electric Heater Performance: Experimental Test and Economic Analysis

An effective krill herd based optimal NN for parameter evaluation in Shell-And-Tube heat exchangers

Optimization of Heat Recovery for Shell & Tube Exchangers in Sulphur Granulation Unit of South Pars Fifth Refinery by Software, ASPEN B-JAC

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