Thermodynamic optimisation of a heat exchanger

Cornelissen, Renè; Hirs, Gerard

doi:10.1016/s0017-9310(98)00118-5

Cited by 40 publications

(16 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Information on exergy losses for material use is limited. The exergy loss in steel production depends on the manufacturing processes and is reported to vary from 4 to 18 MJ/kg [5,21]. Here, an average value of 11 MJ/kg has been taken for exergy losses for primary steel.…”

Section: Resultsmentioning

confidence: 99%

“…Johannessen et al [3] stated that minimum entropy generation of a heat exchanger occurs corresponding to equipartition of entropy production rather than equipartition of thermal driving force. Cor- [4,5] performed combined exergy analysis and life cycle analysis of a balanced counterflow water-to-water heat exchanger; life cycle analysis yields optimum dimensions, where life cycle irreversibility has the minimum value. A few irreversibility studies on balanced heat exchangers for constant fluid properties have also been reported [6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Irreversibility minimization of heat exchangers for transcritical CO2 systems

Sarkar

Bhattacharyya

Gopal

2009

International Journal of Thermal Sciences

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Irreversibility minimization of heat exchangers for transcritical CO2 systems

Sarkar

Bhattacharyya

Gopal

2009

International Journal of Thermal Sciences

View full text Add to dashboard Cite

“…Several researchers have previously studied entropy production in heat exchangers [5][6][7][8][9][10][11][12].…”

Section: Heat Exchangersmentioning

confidence: 99%

Entropy generation minimization of combined heat and mass transfer devices

Narayan

Lienhard

Zubair

2010

International Journal of Thermal Sciences

132

View full text Add to dashboard Cite

This paper details a simple procedure by which the entropy generation in simultaneous heat and mass exchange devices can be minimized. Effectiveness for these devices is defined and a new parameter, 'modified heat capacity rate ratio' is introduced. It is found that the entropy generation of a combined heat and mass exchange device is minimized (at constant value of effectiveness) when the modified heat capacity rate ratio is equal to one irrespective of the value of other independent parameters. Several typical examples of the cooling towers have been studied to illustrate this concept. A practical application of the concept is also illustrated using a humidification-dehumidification desalination system.

show abstract

“…For all energy systems where there is a trade off between exergy saving during operation and exergy using during construction of the energy system, it has been described that this method should be adopted to get true optimum (Cornelissen and Hirs, 1999).…”

Section: Introductionmentioning

confidence: 99%

An approach for the optimum design of heat exchangers

Ünüvar

Kargici

2004

Int. J. Energy Res.

View full text Add to dashboard Cite

SUMMARYIn this paper, an approach for the optimum design of heat exchangers has been presented. Traditional design method of heat exchangers involves many trials in order to meet design specifications. This can be avoided through the present design method, which takes the minimization of annual total cost as a design objective. In alternative optimum design methods, such as Lagrange multiplier method, by changing one variable at a time and using a trial-error or a graphical method, optimum results are obtained in a long time. In the present design optimization problem, the total annual cost has been taken as the objective function and heat balance, and rate equation have been taken as equal constraint. The method using the penalty function transforms the constrained problem into a single unconstrained problem. To solve the optimal problem, the method of steepest descent has been used. Initial design variables include the tubeinside coefficient of heat transfer, tube-outside coefficient of heat transfer, temperature difference and outside tube area of heat transfer. The changes in variables are considered simultaneously to reach an optimum solution. The results show that the present approach is a powerful tool for optimum design of heat exchangers and is expected to be beneficial to energy industry.

show abstract

Thermodynamic optimisation of a heat exchanger

Cited by 40 publications

References 4 publications

Irreversibility minimization of heat exchangers for transcritical CO2 systems

Irreversibility minimization of heat exchangers for transcritical CO2 systems

Entropy generation minimization of combined heat and mass transfer devices

An approach for the optimum design of heat exchangers

Contact Info

Product

Resources

About