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Vadiee, A., Dodoo, A. & Jalilzadehazhari, E. (2020). Heat Supply Comparison in a Single-Family House with Radiator and Floor Heating Systems. Buildings, 10(1), 1-22, Article ID 5.
Open this publication in new window or tab >>Heat Supply Comparison in a Single-Family House with Radiator and Floor Heating Systems
2020 (English)In: Buildings, ISSN 2075-5309, E-ISSN 2075-5309, Vol. 10, no 1, p. 1-22, article id 5Article in journal (Refereed) Published
Abstract [en]

Floor heating and radiators are two of the most common types of hydronic heating systemsused for space heating in single-family houses in cold climate regions. Notwithstanding, there are fewcomparative studies on indoor temperature distribution and system cost evaluations for radiatorsand floor heating. Furthermore, there are no aligned outcomes in terms of total heat supply fora single-family house with radiators or floor heating. In this study, the eect of building energyeciency level and construction type, including flooring material, on the supply heating demand andtransmission heat losses were studied for both radiator and floor heating systems. For this purpose,a single-family house located in Växjö, Sweden, was modeled as a case study. The heating demandwas supplied with a district heating system with a similar supply temperature at 45 C for both theradiator and floor heating system. A sensitivity analysis was also performed to assess the eect offlooring configurations on the annual supply heating demand for both conventional and passiveversions of the case-study building. The results showed that the radiator-integrated building had alower supply heating demand in comparison with the floor heating-integrated buildings. Based onthe sensitivity studies, the flooring material did not have a significant influence on the supply heatingdemand and on the transmission heat losses in the case of the radiators. The supply heating demandwas only reduced up to 3% if the flooring U-value was improved by 60%. The results also showedthat refurbishment in a standard conventional building with a radiator heating system based on thepassive criteria led to a 58% annual energy savings, while this amount for a building with a floorheating system was approximately 49%.

Place, publisher, year, edition, pages
MDPI, 2020
Keywords
floor heating; radiator; built environment; energy efficiency; cold climate region
National Category
Other Civil Engineering
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
urn:nbn:se:lnu:diva-90708 (URN)10.3390/buildings10010005 (DOI)000514573400008 ()
Available from: 2020-01-06 Created: 2020-01-06 Last updated: 2020-03-12Bibliographically approved
Truong, N. L., Gustavsson, L., Dodoo, A. & Tettey, U. Y. (2020). Implications of supplying district heat to a new urban residential area in Sweden. Energy, 194, Article ID 116876.
Open this publication in new window or tab >>Implications of supplying district heat to a new urban residential area in Sweden
2020 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 194, article id 116876Article in journal (Refereed) Published
Abstract [en]

Here we analyze the cost, primary energy and CO2 implications of supplying district heat, considering different supply and return temperatures, to a new residential area in Växjö, Sweden. We explore four land exploitation alternatives consisting different types of buildings with various heated floor areas as well as occupancy densities and two levels of building energy efficiency, based on the Swedish building code and passive house criteria. The analysis shows that energy performance of the buildings and land exploitation alternatives strongly influence the annual heat demand and its profile, which steers the design of the local heat distribution network. Additionally, supply and return temperatures of district heat somewhat influence the design of the network. The distribution heat losses could be reduced by 25% and 50% if district heating systems of 65/30 °C and 50/20 °C, respectively, are used instead of a conventional 80/40 °C system. However, for the same land exploitation alternative, the local distribution heat losses are about the same whether or not the buildings are designed to meet the Swedish building code or passive house criteria, since the same pipe distance is required and the variation of pipe diameters is small. A 50/20 °C system increases electricity use to boost hot water temperature to avoid the risk of legionella bacteria, and this influences quantity of district heat supply, primary energy use and costs. Therefore, a 65/30 °C system appears to be more primary energy and cost efficient than a 50/20 °C system. Increased insulation of district heating network reduces heat losses but this is not cost effective due to increased investment cost. The results are similar whether or not the analysis is based on current energy supply or future renewable based energy supply. This study increases understanding of strategies for planning and designing new urban residential areas and their energy supply systems to reduce primary energy use as well as monetary costs, and to minimize the climate impacts of the built environment.

Place, publisher, year, edition, pages
Elsevier, 2020
National Category
Energy Systems
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
urn:nbn:se:lnu:diva-92425 (URN)10.1016/j.energy.2019.116876 (DOI)
Available from: 2020-02-27 Created: 2020-02-27 Last updated: 2020-03-03Bibliographically approved
Piccardo, C., Dodoo, A., Gustavsson, L. & Tettey, U. Y. (2020). Retrofitting with different building materials: life-cycle primary energy implications. Energy, 192, 1-13, Article ID 116648.
Open this publication in new window or tab >>Retrofitting with different building materials: life-cycle primary energy implications
2020 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 192, p. 1-13, article id 116648Article in journal (Refereed) Published
Abstract [en]

The energy retrofitting of existing buildings reduces the energy use in the operation phase but the use ofadditional materials influence the energy use in other life cycle phases of retrofitted buildings. In thisstudy, we analyse the life cycle primary energy implications of different material alternatives whenretrofitting an existing building to meet high energy performance levels. We design retrofitting optionsassuming the highest and lowest value offinal energy use, respectively, for passive house standardsapplicable in Sweden. The retrofitting options include the thermal improvement of the building enve-lope. We calculate the primary energy use in the operation phase (operation primary energy), as well asin production, maintenance and end-of-life phases (non-operation primary energy). Our results showthat the non-operation primary energy use can vary significantly depending on the choice of materialsfor thermal insulation, cladding systems and windows. Although the operation energy use decreases by63e78%, wefind that the non-operation energy for building retrofitting accounts for up to 21% of theoperation energy saving, depending on the passive house performance level and the material alternative.A careful selection of building materials can reduce the non-operation primary energy by up to 40%,especially when using wood-based materials

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Building retrofit, Passive house, Life cycle, Primary energy use, Building materials
National Category
Environmental Analysis and Construction Information Technology
Research subject
Technology (byts ev till Engineering), Sustainable Built Environment; Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-92243 (URN)10.1016/j.energy.2019.116648 (DOI)000515212800066 ()
Available from: 2020-02-19 Created: 2020-02-19 Last updated: 2020-03-12Bibliographically approved
Vadiee, A., Dodoo, A. & Gustavsson, L. (2019). A Comparison Between Four Dynamic Energy Modeling Tools for Simulation of Space Heating Demand of Buildings.. In: Johansson D., Bagge H., Wahlström Å. (Ed.), Cold Climate HVAC 2018. CCC 2018: . Paper presented at Cold Climate HVAC 2018, The 9th international cold climate conference, sustainable new and renovated buildings in cold climates, Kiruna, Sweden, 12-15 March, 2018 (pp. 701-711). Springer
Open this publication in new window or tab >>A Comparison Between Four Dynamic Energy Modeling Tools for Simulation of Space Heating Demand of Buildings.
2019 (English)In: Cold Climate HVAC 2018. CCC 2018 / [ed] Johansson D., Bagge H., Wahlström Å., Springer, 2019, p. 701-711Conference paper, Published paper (Refereed)
Abstract [en]

Different building energy modelling programs exist and are widely used to calculate energy balance of building in the context of energy renovation of existing buildings or in the design of energy performance of new buildings. The different tools have unique benefits and drawbacks for different conditions. In this study, four different types of building energy system modelling tools including TRNSYS, Energy Plus, IDA-Indoor Climate Energy (IDA-ICE) and VIP-Energy are used to calculate the energy balance of a recently built six-storey apartment building in Växjö, Sweden. The building is designed based on the current Swedish building code. The main outcomes of the software include hourly heating and cooling demands and indoor temperature profiles. We explore the general capabilities of the software and compare the results between them. For the studied building with similar input conditions such as weather climate data file, infiltration and ventilation ratio and internal heat gain, IDA-ICE modeled the highest space heating demand while the TRNSYS the lowest due to the simplification of thermal bridges. The main advance feature of VIP-Energy is the detail thermal bridge analysis while the main drawback is the complexity of using the model. EnergyPlus and TRNSYS can be used for energy supply system integration with the ability to add mathematical sub-modules to the models.

Place, publisher, year, edition, pages
Springer, 2019
Series
Springer Proceedings in Energy, E-ISSN 2352-2534
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-85141 (URN)10.1007/978-3-030-00662-4_59 (DOI)978-3-030-00661-7 (ISBN)978-3-030-00662-4 (ISBN)
Conference
Cold Climate HVAC 2018, The 9th international cold climate conference, sustainable new and renovated buildings in cold climates, Kiruna, Sweden, 12-15 March, 2018
Available from: 2019-06-11 Created: 2019-06-11 Last updated: 2019-06-12Bibliographically approved
Tettey, U. Y., Dodoo, A. & Gustavsson, L. (2019). Carbon balances for a low energy apartment building with different structural frame materials. In: Innovative Solutions for Energy Transitions: Proceedings of the 10th International Conference on Applied Energy (ICAE2018). Paper presented at 10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China (pp. 4254-4261). Elsevier, 158
Open this publication in new window or tab >>Carbon balances for a low energy apartment building with different structural frame materials
2019 (English)In: Innovative Solutions for Energy Transitions: Proceedings of the 10th International Conference on Applied Energy (ICAE2018), Elsevier, 2019, Vol. 158, p. 4254-4261Conference paper, Published paper (Refereed)
Abstract [en]

We analyse the life cycle carbon implications of a building, with structural frame of prefabricated concrete, prefabricated modular timber or cross laminated timber (CLT) elements, designed to meet the Swedish passive house criteria. The analysis covers non-biogenic carbon flows related to the building alternatives, over an assumed life time of 80 years. The building alternatives are all modelled to have the same housing service and operation energy demand. Substitution factors, showing the efficiency of CO2 emissions reductions when wood alternatives are used instead of non-wood alternatives, are calculated for the CLT and modular alternatives with reference to the concrete alternative. The results show that the CLT and modular buildings give less carbon emissions to the atmosphere during production and when the buildings are demolished at the end-of-life. Moreover, the wood residues from the production and end-of-life activities for the timber alternatives far exceed that for the concrete alternative. The substitution factors differ slightly between the CLT and the modular alternatives, and are significantly lower when fossil gas is substituted by wood residues instead of fossil coal. In summary, the life cycle carbon emissions are significantly lower for the timber alternatives.

Place, publisher, year, edition, pages
Elsevier, 2019
Series
Energy Procedia, E-ISSN 1876-6102 ; 158
National Category
Building Technologies Construction Management
Research subject
Technology (byts ev till Engineering), Civil engineering; Technology (byts ev till Engineering), Sustainable Built Environment
Identifiers
urn:nbn:se:lnu:diva-81982 (URN)10.1016/j.egypro.2019.01.801 (DOI)000471031704094 ()2-s2.0-85063918532 (Scopus ID)
Conference
10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China
Available from: 2019-04-15 Created: 2019-04-15 Last updated: 2019-08-29Bibliographically approved
Piccardo, C., Dodoo, A., Gustavsson, L. & Tettey, U. Y. (2019). Comparative Life-Cycle Analysis of Building Materials for the Thermal Upgrade of an Existing Building. In: SBE19 Brussels - BAMB-CIRCPATH "Buildings as Material Banks - A Pathway For A Circular Future"5–7 February 2019, Brussels, Belgium: . Paper presented at Buildings as material Baks: a pathway for a circular future, SBE19 Brussels BAMB-CIRCPATH, 5-7 February, 2019; Brussels. Institute of Physics Publishing (IOPP), 225, Article ID 012044.
Open this publication in new window or tab >>Comparative Life-Cycle Analysis of Building Materials for the Thermal Upgrade of an Existing Building
2019 (English)In: SBE19 Brussels - BAMB-CIRCPATH "Buildings as Material Banks - A Pathway For A Circular Future"5–7 February 2019, Brussels, Belgium, Institute of Physics Publishing (IOPP), 2019, Vol. 225, article id 012044Conference paper, Published paper (Refereed)
Abstract [en]

The existing building stock is estimated to need major renovations in the near future. At the same time, the EU energy-efficiency strategy entails upgrading the energy performance of renovated buildings to meet the nearly-zero energy standard. To upgrade existing buildings, two main groups of measures can be adopted: thermally-improved building envelope and energy-efficient technical devices. The first measure usually involves additional building materials for thermal insulation and new building cladding, as well as new windows and doors. A number of commercially-available materials can be used to renovate thermal building envelopes. This study compares the life-cycle primary energy use and CO2 emission when renovating an existing building using different materials, commonly used in renovated buildings. A Swedish building constructed in 1972 is used as a case-study building. The building's envelope is assumed to be renovated to meet the Swedish passive house standard. The entire life cycle of the building envelope renovation is taken into account. The results show that the selection of building materials can significantly reduce the production primary energy and associated CO2 emissions by up to 62% and 77%, respectively. The results suggest that a careful material choice can significantly contribute to reduce primary energy use and CO2 emissions associated with energy renovation of buildings, especially when renewable-based materials are used.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2019
Series
IOP Conference Series: Earth and Environment, ISSN 1755-1307, E-ISSN 1755-1315 ; 225
National Category
Construction Management
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-81890 (URN)10.1088/1755-1315/225/1/012044 (DOI)2-s2.0-85063379359 (Scopus ID)
Conference
Buildings as material Baks: a pathway for a circular future, SBE19 Brussels BAMB-CIRCPATH, 5-7 February, 2019; Brussels
Available from: 2019-04-12 Created: 2019-04-12 Last updated: 2020-02-19Bibliographically approved
Dodoo, A., Gustavsson, L. & Tettey, U. Y. (2019). Cost-optimized energy-efficient building envelope measures for a multi-storey residential building in a cold climate. In: Yan, J; Yang, HX; Li, H; Chen, X (Ed.), Innovative Solutions for Energy Transitions: Proceedings of the 10th International Conference on Applied Energy (ICAE2018). Paper presented at 10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China (pp. 3760-3767). Elsevier, 158
Open this publication in new window or tab >>Cost-optimized energy-efficient building envelope measures for a multi-storey residential building in a cold climate
2019 (English)In: Innovative Solutions for Energy Transitions: Proceedings of the 10th International Conference on Applied Energy (ICAE2018) / [ed] Yan, J; Yang, HX; Li, H; Chen, X, Elsevier, 2019, Vol. 158, p. 3760-3767Conference paper, Published paper (Refereed)
Abstract [en]

In this study we analyse cost-optimal building envelope measures including insulation for attic roof, ground floor and exterior walls, and efficient windows and doors for new buildings. The analysis is based on a multi-storey building in south of Sweden with an expected lifetime of at least 100 years. We integrate dynamic energy simulation, total and marginal economic analysis, and consider different scenarios of real discount rates and annual energy price increases. Our analysis shows that cost-optimal thicknesses of insulations for the building envelope elements are significantly higher than those required to meet the current Swedish building code’s minimum energy requirements. For windows, the cost-optimal U-value is about the same as required to fulfil the minimum requirement of the Swedish building code. Overall, large energy and cost savings are achieved when the cost-optimal measures are cumulatively implemented. Compared to the reference, annual space heating reduction of 28-43% is achieved for the building with the cost-optimal measures under the analysed period of 50 years. The cost savings varied between 21 and 188 k€.

Place, publisher, year, edition, pages
Elsevier, 2019
Series
Energy Procedia, E-ISSN 1876-6102
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-81980 (URN)10.1016/j.egypro.2019.01.879 (DOI)000471031704020 ()2-s2.0-85063904812 (Scopus ID)
Conference
10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China
Available from: 2019-04-15 Created: 2019-04-15 Last updated: 2019-08-29Bibliographically approved
Tettey, U. Y., Dodoo, A. & Gustavsson, L. (2019). Design strategies and measures to minimise operation energy use for passive houses under different climate scenarios. Energy Efficiency, 12(1), 299-313
Open this publication in new window or tab >>Design strategies and measures to minimise operation energy use for passive houses under different climate scenarios
2019 (English)In: Energy Efficiency, ISSN 1570-646X, E-ISSN 1570-6478, Vol. 12, no 1, p. 299-313Article in journal (Refereed) Published
Abstract [en]

Here, the implications of different design strategies and measures in minimising the heating and cooling demands of a multi-storey residential building, designed to the passive house criteria in Southern Sweden are analysed under different climate change scenarios. The analyses are conducted for recent (1996-2005) and future climate periods of 2050-2059 and 2090-2099 based on the Representative Concentration Pathway scenarios, downscaled to conditions in Southern Sweden. The considered design strategies and measures encompass efficient household equipment and technical installations, bypass of ventilation heat recovery unit, solar shading of windows, window size and properties, building orientation and mechanical cooling. Results show that space heating demand reduces, while cooling demand as well as risk of overheating increases under future climate scenarios. The most important design strategies and measures are efficient household equipment and technical installations, solar shading, bypass of ventilation heat recovery unit and window U-values and g-values. Total annual final energy demand decreased by 40-51%, and overheating is avoided or significantly reduced under the considered climate scenarios when all the strategies are implemented. Overall, the total annual primary energy use for operation decreased by 42-54%. This study emphasises the importance of considering different design strategies and measures in minimising the operation energy use and potential risks of overheating in low-energy residential buildings under future climates.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Climate change, Passive houses, Overheating, Heating and cooling demand, Primary energy, Design strategies
National Category
Energy Engineering Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-80286 (URN)10.1007/s12053-018-9719-4 (DOI)000456140000019 ()2-s2.0-85052069887 (Scopus ID)
Available from: 2019-02-07 Created: 2019-02-07 Last updated: 2019-08-29Bibliographically approved
Tettey, U. Y., Dodoo, A. & Gustavsson, L. (2019). Effect of different frame materials on the primary energy use of a multi storey residential building in a life cycle perspective. Energy and Buildings, 185, 259-271
Open this publication in new window or tab >>Effect of different frame materials on the primary energy use of a multi storey residential building in a life cycle perspective
2019 (English)In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 185, p. 259-271Article in journal (Refereed) Published
Abstract [en]

Primary energy implications over the life cycle of a multi storey residential building with different building systems are explored here. The main structural materials of the buildings include precast concrete, cross laminated timber (CLT) and prefabricated timber modules (modular). The analysis covers energy and material flows from different life cycle phases of the building versions, designed to meet the energy performance of the Swedish building code (BBR) and passive house criteria. The CLT and modular buildings were found to result in lower production primary energy use and higher biomass residues compared to the concrete alternative. The heating value of the recoverable biomass residues from the production phase of the CLT building is significantly larger than the primary energy required for its production. Primary energy use for production and construction constitutes 20-30% and 36-47% of the total primary energy use for production, construction, space heating, ventilation and demolition for the BBR and passive buildings, respectively. Space heating with combined heat and power (CHP) and ventilation electricity for the BBR and passive building versions form 70-79% and 52-63%, respectively, of the total primary energy use for production, construction, space heating, ventilation and demolition for a lifespan of 80 years. The CLT and modular buildings give 20-37% and 9-17% lower total life cycle primary energy use, respectively, than the concrete alternative when space heating is from CHP. (C) 2019 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Life cycle, Primary energy use, Residential buildings, Cross laminated timber, Timber modules, Concrete, Structural frame
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-81093 (URN)10.1016/j.enbuild.2018.12.017 (DOI)000459358900021 ()2-s2.0-85059911195 (Scopus ID)
Available from: 2019-03-15 Created: 2019-03-15 Last updated: 2019-08-29Bibliographically approved
Dodoo, A. (2019). Effect of structural frame materials on lifecycle impacts of buildings. In: Forum Wood Building Baltic 2019, 27 February- 1 March, Tallinn, Estonia: . Paper presented at Forum Wood Building Baltic 2019, 27 February- 1 March, Tallinn, Estonia.. Tallin University of Technoloy
Open this publication in new window or tab >>Effect of structural frame materials on lifecycle impacts of buildings
2019 (English)In: Forum Wood Building Baltic 2019, 27 February- 1 March, Tallinn, Estonia, Tallin University of Technoloy , 2019Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
Tallin University of Technoloy, 2019
National Category
Building Technologies Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-81836 (URN)
Conference
Forum Wood Building Baltic 2019, 27 February- 1 March, Tallinn, Estonia.
Available from: 2019-04-11 Created: 2019-04-11 Last updated: 2019-04-16Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5220-3454

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