Entropy generation minimization of a double-pipe pin fin heat exchanger

Sahiti, Naser; Krasniqi, Fejzullah; Fejzullahu, Xh.; Bunjaku, Januz; Muriqi, Ali

doi:10.1016/j.applthermaleng.2008.01.026

Cited by 69 publications

(36 citation statements)

References 12 publications

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“…The proposed relations (18), (27), (28), and (32) terminal temperature difference and steam condenser effectiveness were verified against data obtained from a condenser simulator (developed using a zero-dimensional steady-state model [4,[6][7][8][9]22]). The simulator was developed on the basis of commonly used correlations for the estimation of overall heat transfer coefficients for water and steam [3,4,[7][8][9]31,32].…”

Section: Entropy Generation In a Condenser And Its Connection With Itmentioning

confidence: 99%

“…The data shown in Fig. 3 indicate that the change in the water entropy rate is greater than the change in the steam entropy rate according to relation (27). Figure 4 shows a comparison between the condenser ratio and the ratio between the increases in steam and water specific entropies, using simulation results.…”

Section: Entropy Generation In a Condenser And Its Connection With Itmentioning

confidence: 99%

“…By changing the three input parameters, a set of data was obtained for variable operating conditions of the condenser. Figure 3 shows the variations the rates of entropy increase for water and steam (for steam it is an absolute value of a change in entropy) as calculated using relation (27) and the simulation results. For points 1 to 16 it was the cooling water temperature at the inlet of the condenser that changed: from 10 • C to 25 • C in one-degree increments.…”

Section: Entropy Generation In a Condenser And Its Connection With Itmentioning

confidence: 99%

“…From the second law of thermodynamics, we know that for real processes the sum of increases in entropy in the system should be greater than zero [19,[24][25][26][27][28].ṁ…”

Section: Entropy Generation In a Condensermentioning

confidence: 99%

See 3 more Smart Citations

Entropy generation in a condenser and related correlations

Askowski¹,

Jaworski²,

Smyk³

2015

Archives of Thermodynamics

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The paper presents an analysis of relations describing entropy generation in a condenser of a steam unit. Connections between entropy generation, condenser ratio, and heat exchanger effectiveness, as well as relations implied by them are shown. Theoretical considerations allowed to determine limits of individual parameters which describe the condenser operation. Various relations for average temperature of the cold fluid were compared. All the proposed relations were verified against data obtained using a simulator and actual measurement data from a 200 MW unit condenser. Based on data from a simulator it was examined how the sum of entropy rates, steam condenser effectiveness, terminal temperature difference and condenser ratio vary with the change in the inlet cooling water temperature, mass flow rate of steam and the cooling water mass flow rate. Keywords: Steam condenser; Entropy generation

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Section: Entropy Generation In a Condenser And Its Connection With Itmentioning

confidence: 99%

Section: Entropy Generation In a Condenser And Its Connection With Itmentioning

confidence: 99%

Section: Entropy Generation In a Condenser And Its Connection With Itmentioning

confidence: 99%

“…From the second law of thermodynamics, we know that for real processes the sum of increases in entropy in the system should be greater than zero [19,[24][25][26][27][28].ṁ…”

Section: Entropy Generation In a Condensermentioning

confidence: 99%

See 2 more Smart Citations

Entropy generation in a condenser and related correlations

Askowski¹,

Jaworski²,

Smyk³

2015

Archives of Thermodynamics

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show abstract

“…Also, they performed a parametric study to show the effects of bypass on the overall performance of heat sinks. Sahiti et al (2008) derived experimentally the heat transfer and pressure drop characteristics of a double-pipe pin fin heat exchanger. The researchers used the empirical correlations previously validated with their experimental data to develop a mathematical model for the optimization of the actual heat exchanger.…”

Section: şAramentioning

confidence: 99%

Thermodynamic Optimization

Awad¹,

Muzychk²

2012

Heat Exchangers - Basics Design Applications

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Second‐Law Based Thermodynamic Analysis of a Novel Heat Exchanger

Lei¹,

Wu²,

Zhang³

et al. 2008

Chem Eng & Technol

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In the present investigation, second-law based thermodynamics analysis was applied to a new heat exchanger with helical baffles. The helical baffles are designed as quadrant ellipses and each baffle occupies one quadrant of the crosssection of the shell side. Experimental tests were carried out with cold water in the tube side with a constant flow rate, and hot oil on the shell side with flow rate range from 4-24 m 3 /h. The temperatures and pressures for the inlet and outlet of both sides were measured. The heat transfer, pressure drop, entropy generation, and exergy loss of the new heat exchanger were investigated and compared with the results for a conventional shell-and-tube heat exchanger with segmental baffles. The computed results indicated that both the entropy generation number and exergy losses of the new heat exchanger design are lower than those of the heat exchanger with segmental baffles, which means that the novel heat exchanger has a higher efficiency than the heat exchanger with segmental baffles, from the second-law based thermodynamics viewpoint.

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Entropy generation minimization of a double-pipe pin fin heat exchanger

Cited by 69 publications

References 12 publications

Entropy generation in a condenser and related correlations

Entropy generation in a condenser and related correlations

Thermodynamic Optimization

Second‐Law Based Thermodynamic Analysis of a Novel Heat Exchanger

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