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Cost optimisation of a flexible heat exchanger network with fluctuation probability using break-even analysis

Heat exchanger network (HEN) which is designed to achieve the maximum energy recovery (MER) involves the integration and interactions of multiple process streams. Small disturbances on one stream can affect other connecting streams. In order to manage these disturbances, the process to process and u...

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Main Authors: Hafizan, A. M., Alwi, S. R. W., Manan, Z. A., Klemes, J. J., Hamid, M. K. A.
Format: Article
Language:English
Published: Italian Association of Chemical Engineering - AIDIC 2019
Subjects:
TP Chemical technology
Online Access:http://eprints.utm.my/id/eprint/89633/1/SharifahRafidahAlwi2019_CostOptimisationofAFlexibleHeatExchanger.pdf
http://eprints.utm.my/id/eprint/89633/
http://www.dx.doi.org/10.3303/CET1976068
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spelling my.utm.896332021-02-09T05:01:05Z http://eprints.utm.my/id/eprint/89633/ Cost optimisation of a flexible heat exchanger network with fluctuation probability using break-even analysis Hafizan, A. M. Alwi, S. R. W. Manan, Z. A. Klemes, J. J. Hamid, M. K. A. TP Chemical technology Heat exchanger network (HEN) which is designed to achieve the maximum energy recovery (MER) involves the integration and interactions of multiple process streams. Small disturbances on one stream can affect other connecting streams. In order to manage these disturbances, the process to process and utility heat exchangers with bypass streams installation are typically overdesigned. However, overdesign also means higher capital investment. This study presents the cost optimisation of flexible MER HEN design which considers the fluctuation probability using break-even analysis. Data were extracted for the Pinch study and assessment for flexibility and MER was performed. The MER heat exchanger maximum size (MER-HEM) is able to handle the most critical supply temperature fluctuations while minimising the utility consumption. The overdesign factor can affect the total annualised cost at a certain probability of fluctuation occurrence. Thus, the break-even analysis of the MER-HEM is performed to determine the probability that resulted in high savings of total annualised cost. Two Scenarios (A and B) with different fluctuation probabilities were used to demonstrate the methodology. Application of the proposed methodology on an Illustrative Case Study shows that, for the fluctuation at hot stream H1, the MER-HEM gives the optimum annualised total cost for Scenario A with additional savings of 10 %. For Scenario B, the MER heat exchanger original size (MER-HEO) is the optimum, giving an additional savings of 4 %. For cold stream C1, the MER-HEO is the optimum for Scenario A, giving an extra savings of 4 % whereas the MER-HEM is the optimum for Scenario B, yielding an extra savings of 9 %. Italian Association of Chemical Engineering - AIDIC 2019 Article PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/89633/1/SharifahRafidahAlwi2019_CostOptimisationofAFlexibleHeatExchanger.pdf Hafizan, A. M. and Alwi, S. R. W. and Manan, Z. A. and Klemes, J. J. and Hamid, M. K. A. (2019) Cost optimisation of a flexible heat exchanger network with fluctuation probability using break-even analysis. Chemical Engineering Transactions, 76 . pp. 403-408. ISSN 2283-9216 http://www.dx.doi.org/10.3303/CET1976068 DOI: 10.3303/CET1976068
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TP Chemical technology
spellingShingle TP Chemical technology
Hafizan, A. M.
Alwi, S. R. W.
Manan, Z. A.
Klemes, J. J.
Hamid, M. K. A.
Cost optimisation of a flexible heat exchanger network with fluctuation probability using break-even analysis
description Heat exchanger network (HEN) which is designed to achieve the maximum energy recovery (MER) involves the integration and interactions of multiple process streams. Small disturbances on one stream can affect other connecting streams. In order to manage these disturbances, the process to process and utility heat exchangers with bypass streams installation are typically overdesigned. However, overdesign also means higher capital investment. This study presents the cost optimisation of flexible MER HEN design which considers the fluctuation probability using break-even analysis. Data were extracted for the Pinch study and assessment for flexibility and MER was performed. The MER heat exchanger maximum size (MER-HEM) is able to handle the most critical supply temperature fluctuations while minimising the utility consumption. The overdesign factor can affect the total annualised cost at a certain probability of fluctuation occurrence. Thus, the break-even analysis of the MER-HEM is performed to determine the probability that resulted in high savings of total annualised cost. Two Scenarios (A and B) with different fluctuation probabilities were used to demonstrate the methodology. Application of the proposed methodology on an Illustrative Case Study shows that, for the fluctuation at hot stream H1, the MER-HEM gives the optimum annualised total cost for Scenario A with additional savings of 10 %. For Scenario B, the MER heat exchanger original size (MER-HEO) is the optimum, giving an additional savings of 4 %. For cold stream C1, the MER-HEO is the optimum for Scenario A, giving an extra savings of 4 % whereas the MER-HEM is the optimum for Scenario B, yielding an extra savings of 9 %.
format Article
author Hafizan, A. M.
Alwi, S. R. W.
Manan, Z. A.
Klemes, J. J.
Hamid, M. K. A.
author_facet Hafizan, A. M.
Alwi, S. R. W.
Manan, Z. A.
Klemes, J. J.
Hamid, M. K. A.
author_sort Hafizan, A. M.
title Cost optimisation of a flexible heat exchanger network with fluctuation probability using break-even analysis
title_short Cost optimisation of a flexible heat exchanger network with fluctuation probability using break-even analysis
title_full Cost optimisation of a flexible heat exchanger network with fluctuation probability using break-even analysis
title_fullStr Cost optimisation of a flexible heat exchanger network with fluctuation probability using break-even analysis
title_full_unstemmed Cost optimisation of a flexible heat exchanger network with fluctuation probability using break-even analysis
title_sort cost optimisation of a flexible heat exchanger network with fluctuation probability using break-even analysis
publisher Italian Association of Chemical Engineering - AIDIC
publishDate 2019
url http://eprints.utm.my/id/eprint/89633/1/SharifahRafidahAlwi2019_CostOptimisationofAFlexibleHeatExchanger.pdf
http://eprints.utm.my/id/eprint/89633/
http://www.dx.doi.org/10.3303/CET1976068
_version_ 1691733108816084992
score 13.211869

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