Evaluating indoor environment of a retrofitted multi-family building with improved energy performance in Sweden

Liu, Linn; Rohdin, Patrik; Moshfegh, Bahram

doi:10.1016/j.enbuild.2015.05.021

Cited by 70 publications

(60 citation statements)

References 12 publications

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“…Values for the key input parameters and assumptions for household equipment and technical installations based on BAT are given in Table 4. The heat gains from electrical appliances, lighting and persons are modelled, taking into account seasonal and daily variations based on average profiles for the Swedish context (Liu et al 2015;Lundström and Wallin 2016). …”

Section: Design Strategies and Measuresmentioning

confidence: 99%

Design strategies and measures to minimise operation energy use for passive houses under different climate scenarios

2018

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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)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(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 lowenergy residential buildings under future climates.

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Section: Design Strategies and Measuresmentioning

confidence: 99%

Design strategies and measures to minimise operation energy use for passive houses under different climate scenarios

2018

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“…However, from the building owner's perspective it can be interesting to take energy saving measures in conjunction with a renovation to reduce the energy costs. Improving the energy performance of a house can also have positive effects on the indoor climate [15] and increase the value of the building [16]. Future district heating systems are likely to have a lower distribution temperature, 50 -60 °C rather than today's 70 -90 °C [17][18][19][20], to meet the needs of new and renovated buildings with low heating demand.…”

Section: Introductionmentioning

confidence: 99%

Techno-economic analysis of energy renovation measures for a district heated multi-family house

Gustafsson

Zhang

et al. 2016

Applied Energy

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Techno-economic analysis of energy renovation measures for a district heated multi-family house.Applied Energy, http://dx.doi.org/10.1016/j.apenergy. 2016.05.104 Access to the published version may require subscription. N.B. When citing this work, cite the original published paper. AbstractRenovation 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.

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“…There were not many attempts at empirical validation of occupied buildings [21]. A few examples on studies that used empirical validation include References [21][22][23][24]. La Fleur, Moshfegh, and Rohdin [21] measured electricity, indoor temperature, and CO 2 level in two apartments, both before and after renovation.…”

Section: Validation Of Bes Modelsmentioning

confidence: 99%

Integration of Measurements and Time Diaries as Complementary Measures to Improve Resolution of BES

2019

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Building energy simulation (BES) models rely on a variety of different input data, and the more accurate the input data are, the more accurate the model will be in predicting energy use. The objective of this paper is to show a method for obtaining higher accuracy in building energy simulations of existing buildings by combining time diaries with data from logged measurements, and also to show that more variety is needed in template values of user input data in different kinds of buildings. The case studied in this article is a retirement home in Linköping, Sweden. Results from time diaries and interviews were combined with logged measurements of electricity, temperature, and CO2 levels to create detailed occupant behavior schedules for use in BES models. Two BES models were compared, one with highly detailed schedules of occupancy, electricity use, and airing, and one using standardized input data of occupant behavior. The largest differences between the models could be seen in energy losses due to airing and in household electricity use, where the one with standardized user input data had a higher amount of electricity use and less losses due to airing of 39% and 99%, respectively. Time diaries and interviews, together with logged measurements, can be great tools to detect behavior that affects energy use in buildings. They can also be used to create detailed schedules and behavioral models, and to help develop standardized user input data for more types of buildings. This will help improve the accuracy of BES models so the energy efficiency gap can be reduced.

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Evaluating indoor environment of a retrofitted multi-family building with improved energy performance in Sweden

Cited by 70 publications

References 12 publications

Design strategies and measures to minimise operation energy use for passive houses under different climate scenarios

Design strategies and measures to minimise operation energy use for passive houses under different climate scenarios

Techno-economic analysis of energy renovation measures for a district heated multi-family house

Integration of Measurements and Time Diaries as Complementary Measures to Improve Resolution of BES

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