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Bhattacharjee, ShimantikaORCID iD iconorcid.org/0000-0001-9279-2233
Alternative names
Publications (4 of 4) Show all publications
Shadram, F., Bhattacharjee, S., Lidelöw, S., Mukkavaara, J. & Olofsson, T. (2020). Exploring the trade-off in life cycle energy of building retrofit through optimization. Applied Energy, 269, Article ID 115083.
Open this publication in new window or tab >>Exploring the trade-off in life cycle energy of building retrofit through optimization
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2020 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 269, article id 115083Article in journal (Refereed) Published
Abstract [en]

Building retrofit is considered as a vital step to achieve energy and climate goals in both Europe and Sweden. Nevertheless, retrofitting solutions based merely on reducing operational energy use can increase embodied energy use, mainly due to altering the existing trade-off between the two. Considering this trade-off is vitally important, especially for retrofitting buildings located in cold climate regions, as reduction of operational energy use to meet standards of energy-efficient buildings may require a deep retrofitting that can considerably increase the embodied energy and thus be unfavorable from a Life Cycle Energy (LCE) perspective. This article presents a case study in which multi-objective optimization was used to explore the impact of a wide range of retrofitting measures on the aforementioned trade-off for a building in Sweden located in a subarctic climatic zone. The studied building was a typical 1980s multi-family residence. The goal was to explore and compare the optimal retrofitting solution(s) for the building, aiming to achieve Swedish energy-efficient building standards (i.e. new-build and near-zero energy standards). The results of the optimization indicated that (1) use of additional insulation in walls and roof, (2) replacement of existing windows with more energy-efficient ones, and (3) change of traditional mechanical extract ventilation to heat recovery ventilation are the primary and optimal retrofitting measures to fulfill the new-build Swedish energy standard and achieve highest LCE savings. However, to fulfill more far-reaching operational energy savings, application of additional retrofitting measures was required, increasing the embodied energy use considerably and resulting in lower LCE savings compared to the optimal retrofitting solution that only reached the Swedish new-build energy standard. The LCE difference between the optimal retrofitting solutions that fulfilled the new-build standard and the strictest near-zero (passive house) standard was 1862 GJ, which is equivalent to almost four years of operational energy use for the original building. This indicates that there is a limit to the reduction of operational energy use when retrofitting existing buildings, beyond which additional reductions can considerably increase the embodied energy and thus be unfavorable in terms of LCE use.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Building retrofit, Embodied energy, Life cycle energy, Multi-objective optimization, Operational energy, Retrofitting measures
National Category
Construction Management
Research subject
Construction Management and Building Technology
Identifiers
urn:nbn:se:ltu:diva-78989 (URN)10.1016/j.apenergy.2020.115083 (DOI)2-s2.0-85084475658 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-05-26 (johcin)

Available from: 2020-05-26 Created: 2020-05-26 Last updated: 2020-05-28Bibliographically approved
Luciani, A., Lidelöw, S., Bhattacharjee, S. & Örn, T. (2019). The Challenge of Energy Efficiency in Kiruna’s Heritage Buildings. In: Johansson D., Bagge H., Wahlström Å. (Ed.), Johansson D., Bagge H., Wahlström Å. (Ed.), Cold Climate HVAC 2018: Sustainable Buildings in Cold Climates. Paper presented at Cold Climate HVAC 2018. Cham: Springer
Open this publication in new window or tab >>The Challenge of Energy Efficiency in Kiruna’s Heritage Buildings
2019 (English)In: Cold Climate HVAC 2018: Sustainable Buildings in Cold Climates / [ed] Johansson D., Bagge H., Wahlström Å., Cham: Springer, 2019Conference paper, Published paper (Refereed)
Abstract [en]

The town of Kiruna, founded in 1900 in the northernmost part of Sweden, is nowadays in the middle of an impressive urban transformation: due to the impacts of mining activities a large part of the city center has to be moved or rebuilt. Among the buildings to be moved and kept in use are some of the so-called ‘Bläckhorn’ timber houses, designed by Gustaf Wickman in the early 20th century as residential units for the workers of the mining company LKAB and part of the original core of Kiruna. This has raised several questions on the sustainability of renovating historic buildings in a sub-arctic climate. In order to explore the challenge of increasing the energy efficiency of the Bläckhorn houses, data on their constructional and historical features as well as their thermal and energy performance have been collected. The paper addresses the following issues. Historic buildings are often blamed for their poor energy efficiency without considering their usually high constructional quality. What do we know about the real performances of these buildings? Energy retrofits in non-monumental and inhabited historic buildings are often guided by practical and operational needs rather than by their heritage significance. Can a value-based approach affect the improvement of energy efficiency? In a subarctic climate, even simple interventions can help to save a considerable amount of energy in historic buildings. To which extent the energy performances of the Bläckhorn houses could be increased without affecting their heritage values?

Place, publisher, year, edition, pages
Cham: Springer, 2019
Series
Springer Proceedings in Energy
Keywords
Energy efficiency Historic buildings Cultural heritage values
National Category
Civil Engineering
Research subject
Architecture; Energy Engineering; Construction Management and Building Technology
Identifiers
urn:nbn:se:ltu:diva-72040 (URN)10.1007/978-3-030-00662-4_24 (DOI)978-3-030-00661-7 (ISBN)978-3-030-00662-4 (ISBN)
Conference
Cold Climate HVAC 2018
Available from: 2018-12-14 Created: 2018-12-14 Last updated: 2019-01-29
Luciani, A., Nilsson, K. L., Lidelöw, S., Bhattacharjee, S. & Örn, T. (2018). Improving the energy efficiency of built heritage in cold regions: Issues and opportunities. In: Tor Broström, Lisa Nilsen and Susanna Carlsten (Ed.), Conference Report. The 3rd International Conference on Energy Efficiency in Historic Buildings (EEHB2018), Visby, Sweden, September 26th to 27th, 2018.: . Paper presented at The 3rd International Conference on Energy Efficiency in Historic Buildings (EEHB2018), Visby, Sweden, September 26th to 27th, 2018. (pp. 182-190).
Open this publication in new window or tab >>Improving the energy efficiency of built heritage in cold regions: Issues and opportunities
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2018 (English)In: Conference Report. The 3rd International Conference on Energy Efficiency in Historic Buildings (EEHB2018), Visby, Sweden, September 26th to 27th, 2018. / [ed] Tor Broström, Lisa Nilsen and Susanna Carlsten, 2018, p. 182-190Conference paper, Published paper (Refereed)
National Category
Architectural Engineering
Research subject
Architecture
Identifiers
urn:nbn:se:ltu:diva-73535 (URN)
Conference
The 3rd International Conference on Energy Efficiency in Historic Buildings (EEHB2018), Visby, Sweden, September 26th to 27th, 2018.
Available from: 2019-04-09 Created: 2019-04-09 Last updated: 2019-09-06
Bhattacharjee, S., Lidelöw, S. & Schade, J. (2018). Performance evaluation of a passive house in sub-arctic climate. In: 9th International Cold Climate Conference, Kiruna, Sweden. March 12-15, 2018: Sustainable New and Renovated Buildings in Cold Climate. Paper presented at 9th International Cold Climate Conference, Kiruna, Sweden. March 12-15, 2018.
Open this publication in new window or tab >>Performance evaluation of a passive house in sub-arctic climate
2018 (English)In: 9th International Cold Climate Conference, Kiruna, Sweden. March 12-15, 2018: Sustainable New and Renovated Buildings in Cold Climate, 2018Conference paper, Published paper (Refereed)
Abstract [en]

As the operational energy use in buildings contributes highly to the total energy used and greenhouse gases emitted in the cold climate regions of Europe, buildings which are more energy-efficient and less carbon-intensive during operation are key to meet sustainability objectives in these regions. Yet, research shows that the practice of passive or low-energy buildings in the sub-arctic climate of northern Sweden is comparatively less than in the southern region. Moreover, previous studies did not explicitly examine the performance of low energy buildings in sub-arctic climate in relation to established building energy efficiency standards. Consequently, knowledge regarding the energy performance of low-energy buildings in such climate is limited. Therefore, the aim is to evaluate the performance, in terms of indoor temperature and energy use for heating, domestic hot water and electricity of a new-built passive house titled “Sjunde Huset” in the sub-arctic town of Kiruna. It is Sweden’s northernmost house designed to fulfil the Swedish passive-house criteria of a maximum heat loss factor of 17 W/m2 and a maximum annual energy use of 63 kWh/m2. The implemented passive design strategies include a highly insulated, compact and airtight building envelope with a vestibule, mechanical ventilation with heat recovery and renewable energy production through photovoltaic solar cells. The house is connected to district heating and is equipped with energy-efficient appliances to allow low occupant energy use. Ongoing performance evaluation is based on building simulation and measurements of energy and temperature in different zones of the building. Energy performance deviations between occupied and non-occupied zones are explored through internal heat gain evaluations. The indoor temperature is also evaluated to assess the temperature variations throughout the year. The ongoing research further evaluate a comparative simulated and measured energy analysis of heating, hot water and electricity based on both the international passive house standard and the Swedish passive house criteria “Feby 12”.

Keywords
Passive house, sub-arctic climate, performance evaluation, energy efficiency, indoor temperature
National Category
Building Technologies
Research subject
Construction Management and Building Technology
Identifiers
urn:nbn:se:ltu:diva-70222 (URN)
Conference
9th International Cold Climate Conference, Kiruna, Sweden. March 12-15, 2018
Available from: 2018-08-06 Created: 2018-08-06 Last updated: 2018-08-13Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0001-9279-2233

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