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Simultaneous production of domestic hot water and space cooling with a heat pump in a Swedish Passive House
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
2012 (English)In: Proceedings of the 25th International Conference on Efficiency, Cost, Optimization and Simulation of Energy Conversion Systems and Processes, ECOS 2012, 2012, Vol. 7, 251-260 p.Conference paper, Published paper (Refereed)
Abstract [en]

Passive Houses have gained popularity the last ten years as a way of improving the energy efficiency in the housing stock. During the cold winter in Sweden, space heating is at times needed but a Passive House is limited to a maximum use of energy for space heating. The challenge of avoiding space heating during the cold wint er climate in Sweden has pushed the design of a Passive House in a direction where problems with excessive indoor temperatures might occur summertime. This paper evaluates a comfort cooling strategy for reaching comfortable indoor climate summertime while maintaining good energy efficiency. The strategy is to use the free cooling from a heat pump while producing domestic hot water. A literature study on heat pumps for simultaneous heating and cooling (HPS) was made in order to make assumptions of the cooling and heating capacities of the HPS for the building simulations. The effect this free cooling has on the indoor climate was thereafter simulated with IDA Indoor Climate and Energy. The building model is based on an actual Passive House in the district of Lambohov in Linköping, Sweden, where continuous logging of temperatures are available. Without comfort cooling, the simulations show excessive temperatures summertime, which is consistent with field measurements from the actual house. Further, the simulation results demonstrate a substantial removal (60-80 %) of excessive indoor temperatures summertime with the cooling strategy implemented.

Place, publisher, year, edition, pages
2012. Vol. 7, 251-260 p.
Keyword [en]
Passive House, Comfort cooling, Building Simulation, Heat pump
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-143417Scopus ID: 2-s2.0-84896520310ISBN: 978-886655322-9 (print)OAI: oai:DiVA.org:kth-143417DiVA: diva2:706602
Conference
25th International Conference on Efficiency, Cost, Optimization and Simulation of Energy Conversion Systems and Processes, ECOS 2012, Perugia, Italy, 26 June 2012 through 29 June 2012
Note

QC 20140321

Available from: 2014-03-21 Created: 2014-03-21 Last updated: 2015-05-07Bibliographically approved
In thesis
1. Low-energy buildings: energy use, indoor climate and market diffusion
Open this publication in new window or tab >>Low-energy buildings: energy use, indoor climate and market diffusion
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Low-energy buildings have, in recent years, gained attention and moved towards a large-scale introduction in the residential sector. During this process, national and international criteria for energy use in buildings have become stricter and the European Union has through the Energy Performance of Buildings Directive imposed on member states to adapt their building regulations for ‘Nearly Zero Energy Buildings’, which by 2021 should be standard for new buildings.

With a primary focus on new terraced and detached houses, this thesis analyses how the concept of low-energy buildings may be further developed to reduce the energy use in the residential sector. The main attention is on the technical performance in terms of indoor climate and heat consumption as well as on the market diffusion of low-energy buildings into the housing market.

A multidisciplinary approach is applied, which here means that the concept of low-energy buildings is investigated from different perspectives as well as on different system levels. The thesis thus encompasses methods from both engineering and social sciences and approaches the studied areas through literature surveys, interviews, assessments and simulations.

The thesis reveals how an increased process integration of the building’s energy system can improve the thermal comfort in low-energy buildings. Moreover, it makes use of learning algorithms – in this case artificial neural networks – to study how the heat consumption can be predicted in a low-energy building in the Swedish climate. The thesis further focuses on the low-energy building as an element in our society and it provides a market diffusion analysis to gain understanding of the contextualisation process. In addition, it suggests possible approaches to increase the market share of low-energy buildings.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. 64 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2014:5
Keyword
building energy simulations, energy efficiency gap, energy use, indoor climate, low-energy buildings
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-143480 (URN)978-91-7595-019-8 (ISBN)
Public defence
2014-03-28, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20140321

Available from: 2014-03-21 Created: 2014-03-21 Last updated: 2016-03-01Bibliographically approved

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