Comparison of distributed and centralised integration of solar heat in a district heating system

Miika Rämä (Corresponding Author), S. Mohammadi (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)

Abstract

Ambitious greenhouse gas emission reduction targets set by EU pose a significant challenge for the member countries. District heating as an efficient solution for heat supply and distribution can play a major part in meeting these targets. One key issue concerning district heating is the integration of renewables. The current study focuses on solar assisted district heating systems.Centralised and distributed solar collectors in an existing district heating system are investigated. The effects of reducing supply temperature are studied in two scenarios. Outdoor dependent supply temperature level (115-80 °C) and low supply temperature level (65 °C) are considered. Both distributed and centralised systems are defined with same investment costs, but different capacities due to differences in unit costs (€/kW). The aim is to study cost-efficient solutions for integrating solar heating an existing district heating system.Heat demand consisting of space heating and domestic hot water consumption, solar collectors and district heating network itself are all modelled by dedicated models in order to provide realistic input for a techno-economic analysis.Investigation is based on a case study of a local district heating system in Finland with an annual heat consumption of 1.2 GWh and a heat demand density of 0.74 MWh/m.
Original languageEnglish
Pages (from-to)649-660
Number of pages12
JournalEnergy
Volume137
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

District heating
Solar collectors
Costs
Solar heating
Space heating
Economic analysis
Hot Temperature
Gas emissions
Greenhouse gases
Temperature
Water

Keywords

  • 4GDH
  • low temperature district heating
  • renewable heat supply
  • solar assisted district heating

Cite this

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title = "Comparison of distributed and centralised integration of solar heat in a district heating system",
abstract = "Ambitious greenhouse gas emission reduction targets set by EU pose a significant challenge for the member countries. District heating as an efficient solution for heat supply and distribution can play a major part in meeting these targets. One key issue concerning district heating is the integration of renewables. The current study focuses on solar assisted district heating systems.Centralised and distributed solar collectors in an existing district heating system are investigated. The effects of reducing supply temperature are studied in two scenarios. Outdoor dependent supply temperature level (115-80 °C) and low supply temperature level (65 °C) are considered. Both distributed and centralised systems are defined with same investment costs, but different capacities due to differences in unit costs (€/kW). The aim is to study cost-efficient solutions for integrating solar heating an existing district heating system.Heat demand consisting of space heating and domestic hot water consumption, solar collectors and district heating network itself are all modelled by dedicated models in order to provide realistic input for a techno-economic analysis.Investigation is based on a case study of a local district heating system in Finland with an annual heat consumption of 1.2 GWh and a heat demand density of 0.74 MWh/m.",
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Comparison of distributed and centralised integration of solar heat in a district heating system. / Rämä, Miika (Corresponding Author); Mohammadi, S. (Corresponding Author).

In: Energy, Vol. 137, 2017, p. 649-660.

Research output: Contribution to journalArticleScientificpeer-review

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AB - Ambitious greenhouse gas emission reduction targets set by EU pose a significant challenge for the member countries. District heating as an efficient solution for heat supply and distribution can play a major part in meeting these targets. One key issue concerning district heating is the integration of renewables. The current study focuses on solar assisted district heating systems.Centralised and distributed solar collectors in an existing district heating system are investigated. The effects of reducing supply temperature are studied in two scenarios. Outdoor dependent supply temperature level (115-80 °C) and low supply temperature level (65 °C) are considered. Both distributed and centralised systems are defined with same investment costs, but different capacities due to differences in unit costs (€/kW). The aim is to study cost-efficient solutions for integrating solar heating an existing district heating system.Heat demand consisting of space heating and domestic hot water consumption, solar collectors and district heating network itself are all modelled by dedicated models in order to provide realistic input for a techno-economic analysis.Investigation is based on a case study of a local district heating system in Finland with an annual heat consumption of 1.2 GWh and a heat demand density of 0.74 MWh/m.

KW - 4GDH

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