Thermodynamic optimization of convective heat transfer through a duct with constant wall temperature

Nag, Preetom; Mukherjee, Prithwish

doi:10.1016/0017-9310(87)90128-1

Cited by 78 publications

(22 citation statements)

References 8 publications

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“…Sekulic DP [11] investigated the entropy generation in a heat exchangers. Nag and Mukherjee [12] derived expression for entropy generation rate in connective heat transfer with constant wall temperature. Bejan [13] presented a broad spectrum of design optimization for simple co-current and countercurrent heat exchangers.…”

Section: -2mentioning

confidence: 99%

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Exergy Losses Relation with Driving Forces for Heat Transfer Process on Hot Plates Using Mathematical Programming

Ashrafizadeh¹,

Amidpour²,

Hedayat³

2016

International Conference of Fluid Flow, Heat and Mass Transfer

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-The heat transfer on plates has many applications among which are the parallel plate heat exchangers. The application of second law of thermodynamics can lead to improvement in the quality of heat transfer process. The combination of design methods and second law analysis can provide an appropriate tool for the designer. The driving forces together with transfer coefficients, affect the heat transfer rate on one hand and given the relation of these forces with irreversibilities, they also influence the exergy losses on the other. Therefore, the driving forces can be used as a relation between heat transfer rate, transfer coefficients and exergy losses. The paper defines a new parameter, called here delivery impediment factor (DIF) which causes a difference in exergy change in the sink and source that lead to exergy losses. Exergy efficiency is expressed in relative driving force. A computer code has been developed to investigate various parameters that affect exergy losses within MATLAB environment. The method involved developing a sink and source model as well as basic relations in heat transfer on plate using mathematical programming. The effect of plate and fluid temperature on exergetic efficiency is shown in graphical form. Based on the results, a relation between the exergy efficiency and design parameters was obtained to make possible the thermodynamic analysis and design simultaneously.

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Section: -2mentioning

confidence: 99%

“…(12)." is very useful as the exergetic efficiency can be obtained by knowing the source, sink and environment temperature.…”

Section: General Exergy Analysis In Heat Transfer Processesmentioning

confidence: 99%

Exergy Losses Relation with Driving Forces for Heat Transfer Process on Hot Plates Using Mathematical Programming

Ashrafizadeh¹,

Amidpour²,

Hedayat³

2016

International Conference of Fluid Flow, Heat and Mass Transfer

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“…The method of Bejan (EGM) does not include the e!ect of variation in #uid temperature similar to that present in tubular heat exchangers. Nag and Kumar (1989) and Nag and Mukherjee (1987) modi"ed Bejan's entropy generation criterion by including the temperature variation along the heat transfer passage. Shen (1993, 1994) have proposed an evaluation method based on exergy analysis.…”

Section: Criteria For Performance Evaluationmentioning

confidence: 99%

Energy conservation through heat transfer enhancement techniques

Zimparov

2002

Int. J. Energy Res.

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SUMMARYEnhanced heat transfer surfaces have been successfully used in the heat transfer industry to obtain more compact and e$cient units. Conservation of the useful part of energy (exergy) can be reached through higher heat transfer than that for standard surfaces and #ow con"gurations. There are numerous ways for heat transfer augmentation which have been marketed or tested in laboratories. In this paper, we review some of the passive techniques for single-phase #ow. One of the most promising heat transfer enhancement techniques is the compound augmentation method, in which di!erent enhancement techniques are used simultaneously. Extended performance evaluation criteria (PEC) equations for enhanced heat transfer surfaces based on the entropy production theorem are developed to include the e!ect of #uid temperature variation along the length of a tubular heat exchanger and assess two objectives simultaneously. The need for this more comprehensive treatment of PEC compared to previous references is illustrated by the analysis of heat transfer and friction characteristics of ten spirally corrugated tubes. These PEC are used to assess the multiplicative e!ect when a corrugated tube is combined with twisted tape insert.

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“…Then heat transfer processes were optimized with the objective of minimum entropy generation. Based on this method, several researchers (Nag & Mukherjee, 1987;Sahin, 1996;Sekulic et al, 1997;Demirel, 2000;Sara et al, 2001;Ko, 2006) analyzed the influences of geometrical, thermal and flow boundary conditions on the entropy generation in various convective heat transfer processes, and then optimized them based on the premise that the minimum entropy generation will lead to the most efficient heat transfer performance. However, there are some scholars (Hesselgreaves, 2000;Shah & Skiepko, 2004;Bertola & Cafaro, 2008) who questioned whether the entropy generation is the universal irreversibility measurement for heat transfer, or the minimum entropy generation is the general optimization criterion for all heat transfer processes, regardless of the nature of the www.intechopen.com…”

Section: Introductionmentioning

confidence: 99%