The Experts below are selected from a list of 2625 Experts worldwide ranked by ideXlab platform
Bahram Moshfegh - One of the best experts on this subject based on the ideXlab platform.
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Investigating cost-optimal energy renovation of a Multifamily Building in Sweden
Energy and Buildings, 2019Co-Authors: Lina La Fleur, Patrik Rohdin, Bahram MoshfeghAbstract:Abstract A significant reduction in energy use in the Building stock is a major challenge for the future, and doing this in a cost-effective manner is important. This study uses an optimization approach to identify life cycle cost (LCC) optimal energy efficiency measures (EEMs) to implement as part of a renovation of a Multifamily Building in Sweden. The studied Building is a Multifamily Building with a lightweight concrete construction and an exhaust air ventilation system, built in 1961. The optimization tool OPERA-MILP is used. The energy renovation approaches are compared to both the performed energy renovation of the Building and a validated dynamic energy simulation model in IDA ICE 4.8. The results show that under the given framework conditions and assumptions it is not cost-optimal to improve the thermal performance of the Building envelope or to implement heat recovery ventilation measures to reduce the space heating demand in the Building when considering a life cycle of 40 years. Balanced mechanical ventilation system with heat recovery is cost-effective when an energy saving target of 40% is introduced. The energy renovation of the Building has a slightly higher LCC than the cost-optimal level, and it would have been more cost-effective to add more insulation to the facade instead of the attic to achieve the same level of energy saving. A sensitivity analysis has been performed to reveal the effect of the discount rate, energy price, cost of EEMs, thermal properties of the Building envelope and windows’ solar heat gain factors on the LCC.
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Energy use and perceived indoor environment in a Swedish Multifamily Building before and after major renovation
Sustainability (Switzerland), 2018Co-Authors: Lina La Fleur, Patrik Rohdin, Bahram MoshfeghAbstract:Improved energy efficiency in the Building sector is a central goal in the European Union and renovation of Buildings can significantly improve both energy efficiency and indoor environment. This paper studies the perception of indoor environment, modelled indoor climate and heat demand in a Building before and after major renovation. The Building was constructed in 1961 and renovated in 2014. Insulation of the façade and attic and new windows reduced average U-value from 0.54 to 0.29 W/m2·K. A supply and exhaust ventilation system with heat recovery replaced the old exhaust ventilation. Heat demand was reduced by 44% and maximum supplied heating power was reduced by 38.5%. An on-site questionnaire indicates that perceived thermal comfort improved after the renovation, and the predicted percentage dissatisfied is reduced from 23% to 14% during the heating season. Overall experience with indoor environment is improved. A sensitivity analysis indicates that there is a compromise between thermal comfort and energy use in relation to window solar heat gain, internal heat generation and indoor temperature set point. Higher heat gains, although reducing energy use, can cause problems with high indoor temperatures, and higher indoor temperature might increase thermal comfort during heating season but significantly increases energy use.
Oviedo-ocaña, Edgar Ricardo - One of the best experts on this subject based on the ideXlab platform.
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Reutilización de aguas grises domésticas para el uso eficiente del recurso hídrico: aceptación social y análisis financiero. Un caso en Portugal
'Universidad Industrial de Santander', 2019Co-Authors: Meléndez-pérez, Julisse Andrea, Lemos-lima, María Manuela C., Dominguez Isabel, Oviedo-ocaña, Edgar RicardoAbstract:Greywater reuse (GWR) in the domestic sector is increasingly recognized as an alternative to face the growing water scarcity. GWR provides an alternative water source (AWS) for purposes that do not require potable water quality. Aiming at promoting AWS implementation in Portugal, a GWR hydro-sanitary system was designed and financially assessed for a Multifamily Building (72 flats). Social acceptancy of sanitary devices and treatment systems that fulfil quality standards for water reuse was addressed. Consultation with potential users allowed identifying GWR acceptance for water from shower, washbasin and bidet for end-uses such as toilet flushing and garden irrigation. The system included a commercial treatment consisting on Membrane Bioreactor, and had 24 years payback period, Net Present Value of 14.775,18 USD, and annual potable water savings of 33 % (3.351,92 m3). Thus, the designed system was technical, social and financially feasible and can contribute to urban water use efficiency.La reutilización de aguas grises (AG) contribuye a la preservación del agua y a disminuir la demanda de agua potable. En busca de potenciar esta alternativa en Portugal, se diseñó y evaluó financieramente un sistema hidrosanitario con reutilización de AG, en un edificio multifamiliar, considerando la aceptación de los usuarios y los sistemas de tratamiento del AG para cumplir con los estándares de calidad para reúso. Los potenciales usuarios aceptaron el reúso de AG provenientes de la ducha, lavamanos y bidé, en la descarga de inodoros y riego de jardines. El sistema propuesto incluye el tratamiento del AG con reactores biológicos de membrana (MBR). Se presentó un periodo de retorno de 24 años y un valor presente neto de 14.775,18 USD, con lo que se demuestra la viabilidad del sistema y se logra una reducción anual en el consumo de agua del 33 % (i. e. 3.351,92 m3) y se contribuye al uso eficiente del recurso en el ámbito urbano
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Reutilización de aguas grises domésticas para el uso eficiente del recurso hídrico: aceptación social y análisis financiero. Un caso en Portugal
2019Co-Authors: Meléndez-pérez, Julisse Andrea, Lemos-lima, María Manuela C., Dominguez Isabel, Oviedo-ocaña, Edgar RicardoAbstract:Greywater reuse (GWR) in the domestic sector is increasingly recognized as an alternative to face the growing water scarcity. GWR provides an alternative water source (AWS) for purposes that do not require potable water quality. Aiming at promoting AWS implementation in Portugal, a GWR hydro-sanitary system was designed and financially assessed for a Multifamily Building (72 flats). Social acceptancy of sanitary devices and treatment systems that fulfil quality standards for water reuse was addressed. Consultation with potential users allowed identifying GWR acceptance for water from shower, washbasin and bidet for end-uses such as toilet flushing and garden irrigation. The system included a commercial treatment consisting on Membrane Bioreactor, and had 24 years payback period, Net Present Value of 14.775,18 USD, and annual potable water savings of 33 % (3.351,92 m3). Thus, the designed system was technical, social and financially feasible and can contribute to urban water use efficiency.La reutilización de aguas grises (AG) contribuye a la preservación del agua y a disminuir la demanda de agua potable. En busca de potenciar esta alternativa en Portugal, se diseñó y evaluó financieramente un sistema hidrosanitario con reutilización de AG en un edificio multifamiliar, considerando la aceptación de los usuarios y los sistemas de tratamiento del AG para cumplir con los estándares de calidad para reuso. Los potenciales usuarios aceptaron el reuso de AG provenientes de la ducha, lavamanos y bidé, en la descarga de inodoros y riego de jardines. El sistema propuesto incluye el tratamiento del AG con reactores biológicos de membrana (MBR). Se presentó un periodo de retorno de 24 años y un valor presente neto de 14.775,18 USD, demostrando la viabilidad del sistema y logrando una reducción anual en el consumo de agua del 33 % (i.e. 3.351,92 m3), contribuyendo al uso eficiente del recurso a nivel urbano
Bernard Marie Lachal - One of the best experts on this subject based on the ideXlab platform.
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large solar driven heat pump system for a Multifamily Building long term in situ monitoring
Solar Energy, 2015Co-Authors: Carolina De Sousa Fraga, Floriane Mermoud, Pierre Hollmuller, Eric Pampaloni, Bernard Marie LachalAbstract:Abstract This article presents the monitoring results of an existing large scale system that combines heat pumps with unglazed solar collectors (used for heat production or as heat source for the heat pumps). The system provides space heating and domestic hot water to a new housing complex (∼10,000 heated m2) in Geneva, Switzerland. Detailed monitoring of one of the blocks (∼1000 heated m2, 32 inhabitants) enables to characterise the behaviour of the system (Building demand, control strategy, temperature levels) and to determine the energy flows as well as the performance of the system. The results show a very low space heating demand for Switzerland (∼20 kWh/m2/yr), and an unusually high domestic hot water consumption (∼50 kWh/m2/yr). The measured seasonal performance factor of the system, including backup electric heating and heat source circulation pump, is 2.9 for 2012 (average of 2.5 in winter and 4.4 in summer). This result can partly be explained by the high domestic hot water consumption, which implies a heat production at high temperature. This project is part of IEA SHC Task 44 “Solar and Heat Pump Systems”.
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predicted versus observed heat consumption of a low energy Multifamily complex in switzerland based on long term experimental data
Energy and Buildings, 2004Co-Authors: Gisela Branco, Bernard Marie Lachal, Peter Giulio Gallinelli, Willi WeberAbstract:Abstract The “Solar Complex of Plan-les-Ouates” is a traditional Multifamily Building with some commercial and administrative areas. It was designed to consume a minimum amount of thermal energy by combining several renewable energy systems (1400 m 2 of solar roof, buried pipe and exhausted air heat exchangers) with an optimised envelope and electrical equipment. Initially predicted to consume 160 MJ/m 2 per year of gas, a gas energy use index (per unit heated floor area) of 246 MJ/m 2 per year was measured. The energy analysis of the Building, based on a 3-year period of monitoring, brought up the most relevant points that explain this difference: the real conditions of utilisation (such as the interior temperature) and the real performance of the complete technical system are not taken into account in the theoretical value. Both technical and economical aspects of the renewable energy systems were analysed in detail. An important lesson learned from this experiment is that the energy concept of Buildings must be simple and consistent and the complexity of the technical installations must be carefully managed from the design-stage to the exploitation. Detailed monitoring of innovative low-energy Buildings is recommended to understand the possible discrepancies between theoretical and real heat consumption and to improve the transfer of new energy technologies to large-scale real constructions.
Lina La Fleur - One of the best experts on this subject based on the ideXlab platform.
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The Impact on System Performance When Renovating a Multifamily Building Stock in a District Heated Region
Sustainability, 2019Co-Authors: Stefan Blomqvist, Lina La Fleur, Patrik Rohdin, Shahnaz Amiri, Louise ÖdlundAbstract:In Sweden, 90% of Multifamily Buildings utilize district heat and a large portion is in need of renovation. The aim is to analyze the impact of renovating a Multifamily Building stock in a district ...
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Investigating cost-optimal energy renovation of a Multifamily Building in Sweden
Energy and Buildings, 2019Co-Authors: Lina La Fleur, Patrik Rohdin, Bahram MoshfeghAbstract:Abstract A significant reduction in energy use in the Building stock is a major challenge for the future, and doing this in a cost-effective manner is important. This study uses an optimization approach to identify life cycle cost (LCC) optimal energy efficiency measures (EEMs) to implement as part of a renovation of a Multifamily Building in Sweden. The studied Building is a Multifamily Building with a lightweight concrete construction and an exhaust air ventilation system, built in 1961. The optimization tool OPERA-MILP is used. The energy renovation approaches are compared to both the performed energy renovation of the Building and a validated dynamic energy simulation model in IDA ICE 4.8. The results show that under the given framework conditions and assumptions it is not cost-optimal to improve the thermal performance of the Building envelope or to implement heat recovery ventilation measures to reduce the space heating demand in the Building when considering a life cycle of 40 years. Balanced mechanical ventilation system with heat recovery is cost-effective when an energy saving target of 40% is introduced. The energy renovation of the Building has a slightly higher LCC than the cost-optimal level, and it would have been more cost-effective to add more insulation to the facade instead of the attic to achieve the same level of energy saving. A sensitivity analysis has been performed to reveal the effect of the discount rate, energy price, cost of EEMs, thermal properties of the Building envelope and windows’ solar heat gain factors on the LCC.
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Energy use and perceived indoor environment in a Swedish Multifamily Building before and after major renovation
Sustainability (Switzerland), 2018Co-Authors: Lina La Fleur, Patrik Rohdin, Bahram MoshfeghAbstract:Improved energy efficiency in the Building sector is a central goal in the European Union and renovation of Buildings can significantly improve both energy efficiency and indoor environment. This paper studies the perception of indoor environment, modelled indoor climate and heat demand in a Building before and after major renovation. The Building was constructed in 1961 and renovated in 2014. Insulation of the façade and attic and new windows reduced average U-value from 0.54 to 0.29 W/m2·K. A supply and exhaust ventilation system with heat recovery replaced the old exhaust ventilation. Heat demand was reduced by 44% and maximum supplied heating power was reduced by 38.5%. An on-site questionnaire indicates that perceived thermal comfort improved after the renovation, and the predicted percentage dissatisfied is reduced from 23% to 14% during the heating season. Overall experience with indoor environment is improved. A sensitivity analysis indicates that there is a compromise between thermal comfort and energy use in relation to window solar heat gain, internal heat generation and indoor temperature set point. Higher heat gains, although reducing energy use, can cause problems with high indoor temperatures, and higher indoor temperature might increase thermal comfort during heating season but significantly increases energy use.
Willi Weber - One of the best experts on this subject based on the ideXlab platform.
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predicted versus observed heat consumption of a low energy Multifamily complex in switzerland based on long term experimental data
Energy and Buildings, 2004Co-Authors: Gisela Branco, Bernard Marie Lachal, Peter Giulio Gallinelli, Willi WeberAbstract:Abstract The “Solar Complex of Plan-les-Ouates” is a traditional Multifamily Building with some commercial and administrative areas. It was designed to consume a minimum amount of thermal energy by combining several renewable energy systems (1400 m 2 of solar roof, buried pipe and exhausted air heat exchangers) with an optimised envelope and electrical equipment. Initially predicted to consume 160 MJ/m 2 per year of gas, a gas energy use index (per unit heated floor area) of 246 MJ/m 2 per year was measured. The energy analysis of the Building, based on a 3-year period of monitoring, brought up the most relevant points that explain this difference: the real conditions of utilisation (such as the interior temperature) and the real performance of the complete technical system are not taken into account in the theoretical value. Both technical and economical aspects of the renewable energy systems were analysed in detail. An important lesson learned from this experiment is that the energy concept of Buildings must be simple and consistent and the complexity of the technical installations must be carefully managed from the design-stage to the exploitation. Detailed monitoring of innovative low-energy Buildings is recommended to understand the possible discrepancies between theoretical and real heat consumption and to improve the transfer of new energy technologies to large-scale real constructions.