Primerjava zaporedne in simultane sinteze toplotno integriranih vodnih omrežij : magistrsko delo

Cetin, Nikolina

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Title:	Primerjava zaporedne in simultane sinteze toplotno integriranih vodnih omrežij : magistrsko delo
Authors:	ID Cetin, Nikolina (Author) ID Nemet, Andreja (Mentor) More about this mentor... ID Kravanja, Zdravko (Comentor) ID Ahmetović, Elvis (Comentor)
Files:	MAG_Cetin_Nikolina_2023.pdf (1,92 MB) MD5: 69352C54418AD0FC57A868974441E3C0
Language:	Slovenian
Work type:	Master's thesis/paper
Typology:	2.09 - Master's Thesis
Organization:	FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:	V magistrskem delu smo primerjali dva pristopa pridobivanja toplotno integriranega vodnega omrežja. Prvi pristop je bil zaporedni pristop, katerega smo zasnovali s konstrukcijo vodnega omrežja v prvem koraku s pomočjo nelinearnega programiranja (NLP). Na podlagi pridobljenega vodnega omrežja smo sestavili niz različnih možnih toplotnih tokov, glede na možnosti mešanja tokov. Na podlagi pridobljenih tokov smo izvedli različne primere toplotne integracije s pomočjo mešano celoštevilskega nelinearnega programiranja (MINLP) in modela Synheat ter primerjali njihove skupne letne stroške. Drugi pristop je bil simultani pristop, kjer smo hkrati optimirali celotno toplotno integrirano vodno omrežje s pomočjo mešano celoštevilskega nelinearnega programiranja (MINLP). V obeh pristopih je bila namenska funkcija definirana kot minimiranje skupnih letnih stroškov toplotno integriranega vodnega omrežja. Pri zaporednem pristopu smo obravnavali štiri različne primere pridobivanja toplotnih tokov. Rešitev je bila toplotno integrirano vodno omrežje. Omrežje, ki je po optimizaciji doseglo najnižje skupne letne stroške (TAC) smo nato primerjali z rešitvijo simultanega omrežja. Pri primerjavi smo se osredotočili na postavitev omrežja, tokove, ki so določeni, količino izmenjane oz. oddane toplote, potrebne velikosti prenosnikov in grelcev ter investicijo in obratovalne stroške. Ugotovili smo, da simultani pristop zagotavlja nižje skupne letne stroške toplotno integriranega vodnega omrežja, saj omogoča optimalno razmerje cepitve tokov za zmanjšane površine prenosnikov, česar pri zaporednem pristopu ne moremo napovedati, saj obstaja neskončno mnogo možnosti za razmerje cepitve tokov.
Keywords:	vodna omrežja, toplotna integracija, toplotno integrirana vodna omrežja, zaporedna sinteza, simultana sinteza, matematično programiranje
Place of publishing:	Maribor
Place of performance:	Maribor
Publisher:	[N. Cetin]
Year of publishing:	2023
Number of pages:	1 spletni vir (1 datoteka PDF (X, 71 f.))
PID:	20.500.12556/DKUM-83937
UDC:	66.011:628.14(043.2)
COBISS.SI-ID:	148488707
Publication date in DKUM:	03.04.2023
Views:	559
Downloads:	71
Metadata:
Categories:	KTFMB - FKKT
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Licences

License:	CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

Link:	http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:	The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:	14.03.2023

Secondary language

Language:	English
Title:	Comparison of sequential and simultaneous synthesis of heat integrated water networks
Abstract:	In the master's thesis, we compared two approaches for obtaining heat integrated water networks. The first approach was a sequential approach, which we designed with the construction of the water network in the first step using non-linear programming (NLP). Based on the obtained water network, we derived a set of different possible heat streams, according to the possibilities of mixing flows. On the basis of the obtained streams, we carried out different examples of heat integration using mixed-integer nonlinear programming (MINLP) of the Synheat model and compared their total annual costs. The second approach was a simultaneous approach, where we simultaneously optimized the entire heat integrated water network using mixed-integer nonlinear programming (MINLP). In both approaches, the objective function was defined as minimizing the total annual cost of the heat integrated water network. We considered four different cases in the sequential approach of obtaining heat streams. The solution was a heat integrated water network. The network that achieved the lowest total annual costs (TAC) after optimization was then compared with the simultaneous network solution. In the comparison, we focused on the layout of the network, the streams that are determined, the amount of exchanged or emitted heat, the required sizes of heat exchangers, coolers and heaters, as well as investment and operating costs. We found that the simultaneous approach provides lower total annual costs of the heat integrated water networks, as it enables the optimal flow splitting ratio for reduced heat exchanger areas, which cannot be predicted with the sequential approach since there are infinitely many possibilities for the flow splitting ratio.
Keywords:	water networks, heat integration, heat integrated water networks, sequential synthesis, simultaneous synthesis, mathematical programming

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