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Absorption cooling in district heating network: Temperature difference examination in hot water circuit
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Absorption cooling system driven by district heating network is relized as a smart strategy in Sweden. During summer time when the heating demand is low, the excessive hot water can be directly sold to drive absorption chillers instead of decreasing its production. In addition, this is also one answer to satisfy the cooling demand in more environmentally way since currently only around 26% of cooling demand in Sweden is satisfied by district cooling, the rest is fulfilled by individual air conditioning. Realizing this potential, the purpose of this study is to examine the returning hot water temperature in the district heating network with supply temperature of 70°C and also the effect to the absorption chiller’s COP. Through the simulation result, it is found out that the lowest possible returning water temperature is 55 °C at COP 0,69 with heat rejection (re-cooling) temperature water at 22 °C. This implies that the desired returning hot water temperature of 47 °C cannot be achieved. The lower returning hot water temperature is preferable since it gives the district heating network benefit in term of less distribution pump work, and energy recovery for the condensation process at central heating plant. 

Place, publisher, year, edition, pages
2013. , 60 p.
Keyword [en]
Absorption chiller, thermal driven cooling, district heating, distrtict cooling, cool-off, COP
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-125068OAI: oai:DiVA.org:kth-125068DiVA: diva2:639375
Subject / course
Sustainable development
Educational program
Master of Science - Environomical Pathways for Sustainable Energy Systems
Presentation
2013-06-11, EKV Library, Brinellvägen 68, 114 28, Stockholm, 11:57 (English)
Supervisors
Examiners
Available from: 2013-08-07 Created: 2013-08-07 Last updated: 2013-08-07Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf