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Design and optimization of indirect energy storage systems for batch process plants / Cheng-Liang Chen in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4817–4829 Titre : Design and optimization of indirect energy storage systems for batch process plants Type de document : texte imprimé Auteurs : Cheng-Liang Chen, Auteur ; Ying-Jyuan Ciou, Auteur Année de publication : 2008 Article en page(s) : p. 4817–4829 Langues : Anglais (eng) Mots-clés : Indirect  heat  exchange  network;  Thermal  storage  policy;  Batch  plant Résumé : One of the main difficulties for handling heat integration problems in batch plants is the time-dependent existence of hot/cold process streams during time period p. This article aims at proposing a generic method for synthesizing an indirect heat exchange network and its associated thermal storage policy for targeting the external utility in a batch plant. Therein, a heat transfer medium (HTM), originally staying in a cold tank, is used to absorb surplus heat from hot process streams, and the HTM with elevated temperature is temporarily stored in a hot tank. The accumulated hot HTM is then utilized to heat subsequent cold process streams, and the cooled HTM recirculates back into its source cold tank. The limitation of heat interchange between time-dependent hot/cold process streams can be relaxed by applying the recirculated heat transfer medium to carry out indirect thermal storage. A superstructure is proposed and the mathematical programming approach is applied for investigating the indirect heat exchange policy. Not using any heuristics that are based on the concepts of pinch limitations, the proposed superstructure-based representation for synthesis of indirect heat exchange networks (HEN’s) for batch processes is formulated as a mixed-integer nonlinear program (MINLP). Numerical examples are explored to demonstrate the applicability of proposed indirect HEN synthesis method for batch processes. This method is verified by two examples with different numbers of storage tanks. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0710667 [article] Design and optimization of indirect energy storage systems for batch process plants [texte imprimé] / Cheng-Liang Chen, Auteur ; Ying-Jyuan Ciou, Auteur . - 2008 . - p. 4817–4829. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4817–4829 Mots-clés : Indirect  heat  exchange  network;  Thermal  storage  policy;  Batch  plant Résumé : One of the main difficulties for handling heat integration problems in batch plants is the time-dependent existence of hot/cold process streams during time period p. This article aims at proposing a generic method for synthesizing an indirect heat exchange network and its associated thermal storage policy for targeting the external utility in a batch plant. Therein, a heat transfer medium (HTM), originally staying in a cold tank, is used to absorb surplus heat from hot process streams, and the HTM with elevated temperature is temporarily stored in a hot tank. The accumulated hot HTM is then utilized to heat subsequent cold process streams, and the cooled HTM recirculates back into its source cold tank. The limitation of heat interchange between time-dependent hot/cold process streams can be relaxed by applying the recirculated heat transfer medium to carry out indirect thermal storage. A superstructure is proposed and the mathematical programming approach is applied for investigating the indirect heat exchange policy. Not using any heuristics that are based on the concepts of pinch limitations, the proposed superstructure-based representation for synthesis of indirect heat exchange networks (HEN’s) for batch processes is formulated as a mixed-integer nonlinear program (MINLP). Numerical examples are explored to demonstrate the applicability of proposed indirect HEN synthesis method for batch processes. This method is verified by two examples with different numbers of storage tanks. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0710667

Design of indirect heat recovery systems with variable-temperature storage for batch plants / Cheng-Liang Chen in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4375–4387 Titre : Design of indirect heat recovery systems with variable-temperature storage for batch plants Type de document : texte imprimé Auteurs : Cheng-Liang Chen, Auteur ; Ying-Jyuan Ciou, Auteur Année de publication : 2009 Article en page(s) : pp. 4375–4387 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Heat  recovery  system  Batch  plant  Variable-temperature  storage  Heat  transfer  medium Résumé : This article aims to propose an iterative method for designing an indirect heat recovery system including the associated variable-temperature storage in a batch plant. A recirculated heat transfer medium (HTM) is applied to absorb surplus heat load from hot process streams and temporarily reserved in storage tanks, where the accumulated energy is then released to later cold process streams by exchanging heat with HTM. This work is a direct extension of one recent article where the restraint of constant temperature for HTM in each storage tank is relaxed to magnify the heat recovery potential. The design problem is formulated as a mixed-integer nonlinear program (MINLP) based on proposed superstructures. A novel iterative solution strategy for setting the variable temperatures of HTM in storage is provided by linking the network optimization tool (a GAMS program) and the streams temperature simulation software (a MATLAB program). One numerical example is explored to demonstrate the applicability of the proposed indirect heat exchanger network design method for batch processes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8013633 [article] Design of indirect heat recovery systems with variable-temperature storage for batch plants [texte imprimé] / Cheng-Liang Chen, Auteur ; Ying-Jyuan Ciou, Auteur . - 2009 . - pp. 4375–4387. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4375–4387 Mots-clés : Heat  recovery  system  Batch  plant  Variable-temperature  storage  Heat  transfer  medium Résumé : This article aims to propose an iterative method for designing an indirect heat recovery system including the associated variable-temperature storage in a batch plant. A recirculated heat transfer medium (HTM) is applied to absorb surplus heat load from hot process streams and temporarily reserved in storage tanks, where the accumulated energy is then released to later cold process streams by exchanging heat with HTM. This work is a direct extension of one recent article where the restraint of constant temperature for HTM in each storage tank is relaxed to magnify the heat recovery potential. The design problem is formulated as a mixed-integer nonlinear program (MINLP) based on proposed superstructures. A novel iterative solution strategy for setting the variable temperatures of HTM in storage is provided by linking the network optimization tool (a GAMS program) and the streams temperature simulation software (a MATLAB program). One numerical example is explored to demonstrate the applicability of the proposed indirect heat exchanger network design method for batch processes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8013633