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Environmental assessment of combined heat and cold production plants for district thermal networks, through optimization methods
KTH, School of Industrial Engineering and Management (ITM).
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

With the international commitment behind the Paris Agreement, district thermal networks’ contribution to final energy demand are bound to increase as they allow significant emission savings. In addition to that, the cooling demand is expected to increase significantly in the coming years. This is why network operators show a growing interest in systems exploiting synergies between heating and cooling networks.

The present report focuses on the use of a simultaneous heating and cooling heat pump to produce thermal energy for a combined heating and cooling system. The performances of this system are assessed using Mixed Integer Linear Programming (MILP) optimization methods. The carbon intensity of such production system is also assessed for European countries with various energy mix.

A first model is formulated to include monthly to yearly time-scales like the ones involved in yearly emission limits or inter-seasonal storage. It shows that electricity price is the main driver for the choice of coupled network. Inter-seasonal cold storage and daily heat storage are also cost-efficient.

A second model including operational constraints with an innovative methodology, more representative of actual network operation, is also tested with promising results.

Abstract [sv]

Fjärrvärme tillåter betydande utsläppsminskningar så att de kommer att expandera i Europa. Kylbehovet kommer också att öka kraftigt under det kommande året. Det är därför nätoperatörer är intresserade av synergier mellan fjärrvärme och fjärrkyla.

Denna studie fokuserar på användning av värmepump för att producera samtidigt uppvärmning och kylning. Systemets prestanda bedöms med MILP (blandad heltal linjär programmering) optimeringsmetoder. Systemets miljöpåverkan bedöms också för europeiska länder med olika energimix.

En första modell byggs inklusive årliga fenomen som utsläppslock eller säsongsförvaring av termisk energi. Det visar att elpriset är den viktigaste drivkraften för valet av kopplade nät. Säsongens kylförvaring och daglig värmelagring är också kostnadseffektiva.

En andra modell inklusive operativa begränsningar med en innovativ metod, mer representativ för faktiskt nätverksdrift, testas också med lovande resultat.

Place, publisher, year, edition, pages
2019.
Series
TRITA-ITM-EX ; 2019:611
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-263177OAI: oai:DiVA.org:kth-263177DiVA, id: diva2:1367028
Supervisors
Examiners
Available from: 2019-11-01 Created: 2019-10-31 Last updated: 2019-11-01Bibliographically approved

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CiteExportLink to record
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