Thermoeconomic analysis of spiral heat exchanger with constant wall temperature

Milovančević, Uroš; Jačimović, Branislav; Genić, Srbislav; Faraj, El-Sagier; Otović, Milena; Stevanovic, M.

doi:10.2298/tsci170605150m

Cited by 16 publications

(13 citation statements)

References 20 publications

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“…A mathematical model is used to validate the results obtained from the numerical simulation. An explicit mathematical model is implemented to calculate S gen,total as follows [38,39]:…”

Section: Resultsmentioning

confidence: 99%

Circular Microchannel Heat Sink Optimization Using Entropy Generation Minimization Method

Kumar

Bharj

2020

Journal of Non-Equilibrium Thermodynamics

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The performance of the microchannel heat sink (MCHS) in electronic applications needs to be optimized corresponding to the number of channels (N). In this study optimization of the number of channels corresponding to the diameter of the microchannel ({D_{N}}) using an entropy generation minimization approach is achieved for the MCHS used in electronic applications. The numerical study is performed for constant total heat flow rate ({\dot{q}_{tot}}) and total mass flow rate ({\dot{m}_{tot}}). The results indicate that the dominance of frictional entropy generation ({S_{gen,Fr}}) increases with the reduction in diameter. However, the entropy generation due to heat transfer ({S_{gen,HT}}) decreases with the reduction in diameter. Therefore, the optimum diameter ({D^{\ast }}) is calculated corresponding to the minimum total entropy generation ({S_{gen,total}}) for the optimum number of channels ({N^{\ast }}). Furthermore, the entropy generation number ({N_{S}}) and Bejan number (Be) are also calculated.

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“…A mathematical model is used to validate the results obtained from the numerical simulation. An explicit mathematical model is implemented to calculate S gen,total as follows [38,39]:…”

Section: Resultsmentioning

confidence: 99%

Circular Microchannel Heat Sink Optimization Using Entropy Generation Minimization Method

Kumar

Bharj

2020

Journal of Non-Equilibrium Thermodynamics

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“…Validation for the optimum diameter (D * ) corresponding to the optimum number of channels (N * ) in the case of CPS is done with an existing explicit mathematical methodology used by Genić et al [51] and Milovančević et al [52]. It is noted that the outcomes are in good agreement.…”

Section: Validationmentioning

confidence: 93%

Effect of Thermophysical Property Variation on Entropy Generation towards Micro-Scale

Chauhan

Kumar

et al. 2020

Journal of Non-Equilibrium Thermodynamics

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In this work, the effect of temperature-dependent thermal conductivity (k(T)) and viscosity (\mu (T)) variation on entropy generation in circular channels with an approach from macro- to micro-scale is numerically investigated. Thermally as well as hydrodynamically fully developed flow of water through the fixed length channels with constant total heat flow rate and total mass flow rate is considered. The effects of k(T) variation and \mu (T) variation on entropy generation are analyzed individually as well as collectively. It is observed that in the case of Constant Property Solutions (CPS) {S_{\mathit{gen},\mathit{tot}}} is maximum at the macro-level; however, in the case of combined k(T) and \mu (T) variations it is maximum at the micro-level. The Bejan number (\mathit{Be}) and irreversibility distribution ratio (φ) are also calculated for asserting the dominance of frictional irreversibility and conduction heat transfer irreversibility. Additionally, the optimum diameter ({D^{\ast }}) corresponding to the optimum number of channels is calculated at minimum total entropy generation. It is observed that {D^{\ast }} is minimum for k(T) variation followed by CPS, \mu (T) variation, and combined k(T) and \mu (T) variations.

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“…Step 8: Studying the performance of and irreversibilities in spiral turns of the SPHE according to entropy analysis can be carried out by Equation 37, (38), (39), and (40). These equations have to be applied to each heat exchanger in the equivalent internal heat exchangers network of model.…”

Section: Mathematical Modeling and Analyzing Spiral Turnsmentioning

confidence: 99%

“…In recent years, a new research was carried out by Milovančević et al based on entropy generation to study the thermoeconomic analysis of SPHEs. [ 40 ] They focused on determination of the optimum SPHE size according to minimum entropy generation.…”

Section: Introductionmentioning

confidence: 99%

Performance and Irreversibility Analysis of Spiral Plate Heat Exchangers

2020

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Herein, a model is developed based on energy balance equations to analyze and improve the performance of single‐phase counter‐current and co‐current flow spiral plate heat exchangers (SPHEs). The aim is to comprehensively check the performance and irreversibility factors based on energy, entropy, and entransy methods. First, a new optimization algorithm is proposed to maximize pressure drops and minimize the total cost by considering the geometric proportion of the SPHE. Second, the SPHE spiral turns are modeled as a series‐connected equivalent internal heat exchangers network to determine the temperature boundaries and develop the temperature–enthalpy diagram in analysis. The algorithm and modeling is validated in two stages for different flow arrangement SPHEs. Performance and irreversibility analysis shows similar result trends in different flow patterns. In third stage, a wide range of counter‐current flow SPHEs with constant heat transfer rate is designed, modeled, and analyzed by energy, entropy, and entransy methods. To recapitulate, results assert that SPHEs designed by new algorithm have higher overall heat‐transfer coefficient and compactness. Although entropy and entransy analyses reveal irreversibility trends with effectiveness in SPHEs, entransy analysis is more effective and reliable to analyze the SPHEs.

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Thermoeconomic analysis of spiral heat exchanger with constant wall temperature

Cited by 16 publications

References 20 publications

Circular Microchannel Heat Sink Optimization Using Entropy Generation Minimization Method

Circular Microchannel Heat Sink Optimization Using Entropy Generation Minimization Method

Effect of Thermophysical Property Variation on Entropy Generation towards Micro-Scale

Performance and Irreversibility Analysis of Spiral Plate Heat Exchangers

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