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Energetic and exergetic analysis of a low- Temperature based district heating substation for low energy buildings
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.ORCID iD: 0000-0001-6982-2879
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2015 (English)In: ECOS 2015 - 28th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, International Conference on Efficiency,Cost, Optimization, Simulation and Environmental Impact of Energy Systems , 2015Conference paper (Refereed)
Abstract [en]

District Heating (DH) technology contributes to the low GHG emissions energy system, facilitates a renewable energy usage, and increases the overall system efficiency, while providing the necessary heating services to the built environment. However, the existing DH technology may not be technically and economically effective to service buildings with low-energy demands. Here, low- Temperature based district heating (LTDH) provides a better match between supply and demand in terms of energy quality. This paper deals with the energy and exergy analyses of a LTDH substation supplying a secondary LTDH network as a subnet of the existing DH system. The substation is supplied with a mix of supply and return flows from the main DH network. An energy and exergy analysis was employed based on modelling and simulation to compare the performance of two proposed substation configurations to that of a conventional DH substation operating at low- Temperature. The study was performed for a year round outdoor temperatures scenario under steady-state conditions. The exergy destruction at the system components was identified and compared. The results of this analysis show that by using the low- Temperature flow from the DH return pipe, the final exergy efficiency of the overall system is increased. On the other hand, assuming an adiabatic system the energy performance stays the same. As compared with the conventional DH network, the integration of the proposed LTDH substation reduced the share of energy demand covered by the main DH supply by 20-25% and improved the overall exergy efficiency from 79% to 85-87% depending on the substation configuration. Based on the results, the solution presented is seen as an effective approach to reduce the system's losses, and to increase the quality match between the low-energy heating demands and the supply.

Place, publisher, year, edition, pages
International Conference on Efficiency,Cost, Optimization, Simulation and Environmental Impact of Energy Systems , 2015.
Keyword [en]
District heating, Efficiency, Exergy, Low temperature, Substation, Temperature cascading, Economic and social effects, Economics, Environmental impact, Greenhouse gases, Heating, Temperature, Energetic and exergetic analysis, Energy and exergy analysis, Low energy buildings, Low temperatures, Modelling and simulations, Steady-state condition, Substation configurations, Energy efficiency
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-194644ScopusID: 2-s2.0-84978906844ISBN: 9782955553909OAI: oai:DiVA.org:kth-194644DiVA: diva2:1050570
Conference
28th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2015, 29 June 2015 through 3 July 2015
Note

QC 20161129

Available from: 2016-11-29 Created: 2016-10-31 Last updated: 2016-11-29Bibliographically approved

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