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Techno-economic analysis of energy renovation measures for a district heated multi-family house
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Fluid and Climate Technology. Dalarna University, Sweden.
Högskolan Dalarna, Energiteknik; Mälardalens Högskola.
Högskolan Dalarna, Byggteknik.
Högskolan Dalarna, Energiteknik.
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2016 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 177, 108-116 p.Article in journal (Refereed) Published
Abstract [en]

Renovation of existing buildings is important in the work towards increased energy efficiency and reduced environmental impact. The present paper treats energy renovation measures for a Swedish district heated multi-family house, evaluated through dynamic simulation. Insulation of roof and façade, better insulating windows and flow-reducing water taps, in combination with different HVAC systems for recovery of heat from exhaust air, were assessed in terms of life cycle cost, discounted payback period, primary energy consumption, CO₂ emissions and non-renewable energy consumption. The HVAC systems were based on the existing district heating substation and included mechanical ventilation with heat recovery and different configurations of exhaust air heat pump.

Compared to a renovation without energy saving measures, the combination of new windows, insulation, flow-reducing taps and an exhaust air a heat pump gave up to 24% lower life cycle cost. Adding insulation on roof and façade, the primary energy consumption was reduced by up to 58%, CO₂ emissions up to 65% and non-renewable energy consumption up to 56%. Ventilation with heat recovery also reduced the environmental impact but was not economically profitable in the studied cases. With a margin perspective on electricity consumption, the environmental impact of installing heat pumps or air heat recovery in district heated houses is increased. Low-temperature heating improved the seasonal performance factor of the heat pump by up to 11% and reduced the environmental impact.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 177, 108-116 p.
Keyword [en]
District heating, air heat recovery, heat pump, LCC, primary energy, low-temperature heating
National Category
Environmental Analysis and Construction Information Technology Energy Systems
Research subject
Energy Technology
URN: urn:nbn:se:kth:diva-172979DOI: 10.1016/j.apenergy.2016.05.104ISI: 000380623900010ScopusID: 2-s2.0-84969776538OAI: diva2:851303

QC 20160809

Available from: 2015-09-04 Created: 2015-09-04 Last updated: 2016-09-20Bibliographically approved
In thesis
1. Energy efficient and economic renovation of residential buildings with low-temperature heating and air heat recovery
Open this publication in new window or tab >>Energy efficient and economic renovation of residential buildings with low-temperature heating and air heat recovery
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

With the building sector accounting for around 40% of the total energy consumption in the EU, energy efficiency in buildings is and continues to be an important issue. Great progress has been made in reducing the energy consumption in new buildings, but the large stock of existing buildings with poor energy performance is probably an even more crucial area of focus. This thesis deals with energy efficiency measures that can be suitable for renovation of existing houses, particularly low-temperature heating systems and ventilation systems with heat recovery. The energy performance, environmental impact and costs are evaluated for a range of system combinations, for small and large houses with various heating demands and for different climates in Europe. The results were derived through simulation with energy calculation tools.

Low-temperature heating and air heat recovery were both found to be promising with regard to increasing energy efficiency in European houses. These solutions proved particularly effective in Northern Europe as low-temperature heating and air heat recovery have a greater impact in cold climates and on houses with high heating demands. The performance of heat pumps, both with outdoor air and exhaust air, was seen to improve with low-temperature heating. The choice between an exhaust air heat pump and a ventilation system with heat recovery is likely to depend on case specific conditions, but both choices are more cost-effective and have a lower environmental impact than systems without heat recovery. The advantage of the heat pump is that it can be used all year round, given that it produces DHW.

Economic and environmental aspects of energy efficiency measures do not always harmonize. On the one hand, lower costs can sometimes mean larger environmental impact; on the other hand there can be divergence between different environmental aspects. This makes it difficult to define financial subsidies to promote energy efficiency measures.

Abstract [sv]

Byggnader står för omkring 40 % av den totala energianvändningen i EU. Energieffektivisering av byggnader är och fortsätter därför att vara en viktig fråga. Även om stora framsteg har gjorts när det gäller att minska energianvändningen i nya byggnader så är det stora beståndet av befintliga byggnader med dålig energiprestanda förmodligen ett ännu viktigare område att fokusera på. Denna avhandling behandlar energieffektiviseringsåtgärder som kan lämpa sig för renovering av befintliga hus, i synnerhet lågtemperaturvärmesystem och ventilationssystem med värmeåtervinning. Energiprestanda, miljöpåverkan och kostnader utvärderas för en rad systemkombinationer, för små och stora hus med olika värmebehov och för olika klimat i Europa. Resultaten togs fram genom simuleringar med energiberäkningsprogram.

Lågtemperatursystem och värmeåtervinning framstod båda som lovande lösningar för energieffektivisering av europeiska hus, särskilt i norra Europa, eftersom dessa åtgärder har större effekt i kalla klimat och på hus med stort värmebehov. Prestandan för värmepumpar, såväl av utelufts- som frånluftstyp, förbättrades med lågtemperaturvärmesystem. Valet mellan frånluftsvärmepump och värmeåtervinning till ventilationsluft kan antas bero på specifika förhållanden för varje fall, men de är båda mer kostnadseffektiva och har lägre miljöpåverkan än system utan värmeåtervinning. Värmepumpen har fördelen att den kan återvinna värme året runt, förutsatt att den producerar varmvatten.

Ekonomiska och miljömässiga aspekter av energieffektiviseringsåtgärder stämmer inte alltid överens. Dels lägre kostnad ibland betyda större miljöpåverkan, dels kan det finnas divergens mellan olika miljöaspekter. Detta gör det svårt att fastställa subventioner för att främja energieffektiviseringsåtgärder.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. vii, 27 p.
National Category
Environmental Analysis and Construction Information Technology
Research subject
Energy Technology
urn:nbn:se:kth:diva-172982 (URN)978-91-7595-664-0 (ISBN)
2015-09-18, Övningssal 25, Brinellvägen 23, KTH, Stockholm, 13:00 (English)

QC 20150904

Available from: 2015-09-04 Created: 2015-09-04 Last updated: 2015-09-04Bibliographically approved

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