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Competence in performing Building Performance Simulations (BPS) is a fundamental asset for an energy specialist. However, teaching BPS to new students can be challenging, often due to the overwhelming capabilities of the software. The consequences for students are frustration and lack of confidence using the software, dividing group work based on previous expertise and, most importantly, the inability to predict and critically analyse results due to the superficial understanding of simulations. This paper presents and evaluates a simple method named ‘control method’ which is intended to introduce BPS in classes where students have a limited experience working with BPS, significantly different educational backgrounds, and where the time to teach BPS in class is limited. The method is built around the Structure of Observed Learning Outcomes taxonomy. It aims to provide the students with a basic understanding of the input-output relationship between parameters, prompting the use of BPS independently during their individual study time. The application of the method is evaluated with two survey-based studies. The findings suggest that the method prompts higher level thinking in BPS and collaborative learning in groups. Further investigation is needed to verify if students’ ability to predict results is also increased.
Niko Gentile; Jouri Kanters; Henrik Davidsson. A Method to Introduce Building Performance Simulation to Beginners. Energies 2020, 13, 1941 .
AMA StyleNiko Gentile, Jouri Kanters, Henrik Davidsson. A Method to Introduce Building Performance Simulation to Beginners. Energies. 2020; 13 (8):1941.
Chicago/Turabian StyleNiko Gentile; Jouri Kanters; Henrik Davidsson. 2020. "A Method to Introduce Building Performance Simulation to Beginners." Energies 13, no. 8: 1941.
Pia Piroschka Otte; Ricardo Bernardo; Randi Phinney; Henrik Davidsson; Lucas Daniel Tivana. Facilitating integrated agricultural technology development through participatory research. The Journal of Agricultural Education and Extension 2018, 24, 285 -299.
AMA StylePia Piroschka Otte, Ricardo Bernardo, Randi Phinney, Henrik Davidsson, Lucas Daniel Tivana. Facilitating integrated agricultural technology development through participatory research. The Journal of Agricultural Education and Extension. 2018; 24 (3):285-299.
Chicago/Turabian StylePia Piroschka Otte; Ricardo Bernardo; Randi Phinney; Henrik Davidsson; Lucas Daniel Tivana. 2018. "Facilitating integrated agricultural technology development through participatory research." The Journal of Agricultural Education and Extension 24, no. 3: 285-299.
Many agricultural technology interventions that aim to improve farmers’ livelihoods focus on households as the unit of analysis and ignore gender roles that entail different benefits and costs for different household members. Agricultural projects have shown limited success where gender roles and relations were ignored and thus more gender sensitive research is needed in agricultural technology development to ensure social acceptance. In this study, we address this need by investigating the importance of gender roles and relations in the case of solar fruit drying in Mozambique. We apply a variety of gender sensitive participatory methods that enable farmers to actively take part in the technology development process. First results indicate that the costs and benefits of solar fruit drying are not shared equally between genders. Women have much less time available for using the solar fruit dryer. The data also indicate that certain steps in the solar fruit drying process are clearly gender divided. We finally discuss potential mechanisms that can be applied in agricultural technology projects that can create awareness of the risk to reproduce traditional gender roles and unequal relations in the development process of new agricultural technologies.
Pia Piroschka Otte; Lucas Daniel Tivana; Randi Phinney; Ricardo Bernardo; Henrik Davidsson. The importance of gender roles and relations in rural agricultural technology development: a case study on solar fruit drying in Mozambique. Gender, Technology and Development 2018, 22, 40 -58.
AMA StylePia Piroschka Otte, Lucas Daniel Tivana, Randi Phinney, Ricardo Bernardo, Henrik Davidsson. The importance of gender roles and relations in rural agricultural technology development: a case study on solar fruit drying in Mozambique. Gender, Technology and Development. 2018; 22 (1):40-58.
Chicago/Turabian StylePia Piroschka Otte; Lucas Daniel Tivana; Randi Phinney; Ricardo Bernardo; Henrik Davidsson. 2018. "The importance of gender roles and relations in rural agricultural technology development: a case study on solar fruit drying in Mozambique." Gender, Technology and Development 22, no. 1: 40-58.
Henrik Davidsson; Joakim Olsson; Randi Phinney; Ricardo Bernardo; Pia Otte; Lucas Daniel Tivana. Towards a Homogenous Drying Rate Using a Solar Fruit Dryer. Proceedings of SWC2017/SHC2017 2017, 1 .
AMA StyleHenrik Davidsson, Joakim Olsson, Randi Phinney, Ricardo Bernardo, Pia Otte, Lucas Daniel Tivana. Towards a Homogenous Drying Rate Using a Solar Fruit Dryer. Proceedings of SWC2017/SHC2017. 2017; ():1.
Chicago/Turabian StyleHenrik Davidsson; Joakim Olsson; Randi Phinney; Ricardo Bernardo; Pia Otte; Lucas Daniel Tivana. 2017. "Towards a Homogenous Drying Rate Using a Solar Fruit Dryer." Proceedings of SWC2017/SHC2017 , no. : 1.
Tomas Ekström; Ricardo Bernardo; Henrik Davidsson; Åke Blomsterberg. Renovation of Swedish single-family houses from the 1960s and 1970s to net-zero energy buildings – Case study. Proceedings of SWC2017/SHC2017 2017, 1 .
AMA StyleTomas Ekström, Ricardo Bernardo, Henrik Davidsson, Åke Blomsterberg. Renovation of Swedish single-family houses from the 1960s and 1970s to net-zero energy buildings – Case study. Proceedings of SWC2017/SHC2017. 2017; ():1.
Chicago/Turabian StyleTomas Ekström; Ricardo Bernardo; Henrik Davidsson; Åke Blomsterberg. 2017. "Renovation of Swedish single-family houses from the 1960s and 1970s to net-zero energy buildings – Case study." Proceedings of SWC2017/SHC2017 , no. : 1.
According to recent technology road maps, system cost reductions and development of standardised plug-and-function systems are some of the most important goals for solar heating technology development. Retrofitting hot water boilers in single-family houses when installing solar collectors has the potential to significantly reduce both material and installation costs. Previous studies have investigated such retrofitting, using theoretical simulations and laboratory tests, but no actual installations were made and tested in practice. This article describes the installation, measured performance and cost effectiveness of a retrofitting solution that converts existing domestic hot water heaters to a solar domestic hot water system. The measured performance is characterised by the monthly and annual solar fractions. The cost effectiveness is evaluated by a life-cycle cost analysis, comparing the retrofitted system to a conventional solar domestic hot water system and the case without any solar heating system. Measurements showed that approximately 50% of the 5000 kWh/year of domestic hot water consumption was saved by the retrofitted system in south Sweden. Such savings are in agreement with previous estimations and are comparable to the energy savings when using a conventional solar domestic hot water system. The life-cycle cost analysis showed that, according to the assumptions and given climate, the return on investment of the retrofitted system is approximately 17 years, while a conventional system does not reach profitability during its lifetime of 25 years.
Luis Ricardo Bernardo; Henrik Davidsson; Erik Andersson. Retrofitted Solar Domestic Hot Water Systems for Swedish Single-Family Houses—Evaluation of a Prototype and Life-Cycle Cost Analysis. Energies 2016, 9, 953 .
AMA StyleLuis Ricardo Bernardo, Henrik Davidsson, Erik Andersson. Retrofitted Solar Domestic Hot Water Systems for Swedish Single-Family Houses—Evaluation of a Prototype and Life-Cycle Cost Analysis. Energies. 2016; 9 (11):953.
Chicago/Turabian StyleLuis Ricardo Bernardo; Henrik Davidsson; Erik Andersson. 2016. "Retrofitted Solar Domestic Hot Water Systems for Swedish Single-Family Houses—Evaluation of a Prototype and Life-Cycle Cost Analysis." Energies 9, no. 11: 953.
L. R. Bernardo; Henrik Davidsson. Retrofitting Electrically Heated Single-Family Houses to Net-Zero Energy. Proceedings of the ISES Solar World Congress 2015 2016, 1 .
AMA StyleL. R. Bernardo, Henrik Davidsson. Retrofitting Electrically Heated Single-Family Houses to Net-Zero Energy. Proceedings of the ISES Solar World Congress 2015. 2016; ():1.
Chicago/Turabian StyleL. R. Bernardo; Henrik Davidsson. 2016. "Retrofitting Electrically Heated Single-Family Houses to Net-Zero Energy." Proceedings of the ISES Solar World Congress 2015 , no. : 1.
Henrik Davidsson; Ricardo Bernardo; Joao Gomes; Niko Gentile; Christian Gruffman; Luis Chea; Björn Karlsson. Construction of Laboratories for Solar Energy Research in Developing Countries. Energy Procedia 2014, 57, 982 -988.
AMA StyleHenrik Davidsson, Ricardo Bernardo, Joao Gomes, Niko Gentile, Christian Gruffman, Luis Chea, Björn Karlsson. Construction of Laboratories for Solar Energy Research in Developing Countries. Energy Procedia. 2014; 57 ():982-988.
Chicago/Turabian StyleHenrik Davidsson; Ricardo Bernardo; Joao Gomes; Niko Gentile; Christian Gruffman; Luis Chea; Björn Karlsson. 2014. "Construction of Laboratories for Solar Energy Research in Developing Countries." Energy Procedia 57, no. : 982-988.
In order to make cities more resilient, our urban environment should not only consume energy, it should also become energy producing. Flat roofs are highly suitable for the placement of PV systems to produce renewable energy, but the assessment of its exact energy potential is not straightforward. Important configurations parameters of PV systems are the inclination and row distance, both leading to mutual shading. This study examined the technical and economic consequences of mutual shading of PV systems. In the first part, a comparison is performed between an unshaded module and a shaded module with different row distances and inclinations; in the second part, the energy output as well as payback times of a PV system on a flat roof were simulated. A significant decrease in energy production was seen due to mutual shading, while the configuration to achieve the maximum energy output was at an inclination of 0° and a row distance of 0 metres. Payback calculations showed that, when electricity prices rise in the future, more options concerning inclination and row distance became feasible
Jouri Kanters; Henrik Davidsson. Mutual Shading of PV Modules on Flat Roofs: A Parametric Study. Energy Procedia 2014, 57, 1706 -1715.
AMA StyleJouri Kanters, Henrik Davidsson. Mutual Shading of PV Modules on Flat Roofs: A Parametric Study. Energy Procedia. 2014; 57 ():1706-1715.
Chicago/Turabian StyleJouri Kanters; Henrik Davidsson. 2014. "Mutual Shading of PV Modules on Flat Roofs: A Parametric Study." Energy Procedia 57, no. : 1706-1715.
One of the most important factors when low energy houses are built is to have good heat recovery on the ventilation system. However, standard ventilation units use a considerable amount of electricity. This article discusses the consequences on a system level of using hybrid ventilation with heat recovery. The simulation program TRNSYS was used in order to investigate a ventilation system with heat recovery. The system also includes a ground source storage and waste water heat recovery system. The result of the analysis shows that the annual energy gain from ground source storage is limited. However, this is partly a consequence of the fact that the well functioning hybrid ventilation system leaves little room for improvements. The analysis shows that the hybrid ventilation system has potential to be an attractive solution for low energy buildings with a very low need for electrical energy.
Henrik Davidsson; Ricardo Bernardo; Bengt Hellström. Hybrid Ventilation with Innovative Heat Recovery—A System Analysis. Buildings 2013, 3, 245 -257.
AMA StyleHenrik Davidsson, Ricardo Bernardo, Bengt Hellström. Hybrid Ventilation with Innovative Heat Recovery—A System Analysis. Buildings. 2013; 3 (1):245-257.
Chicago/Turabian StyleHenrik Davidsson; Ricardo Bernardo; Bengt Hellström. 2013. "Hybrid Ventilation with Innovative Heat Recovery—A System Analysis." Buildings 3, no. 1: 245-257.
A key component in low energy houses is the heat recovery from the ventilation air. Over recent years, the most frequently used ventilation type is the mechanical ventilation with heat recovery. This kind of ventilation results in high heat recovery but does unfortunately consume a considerable amount of electrical energy. Natural or hybrid ventilation has the potential to consume less electricity but normally lacks heat recovery, leading to high-energy consumption for heating, and potentially low comfort. This article describes an investigation of a natural/hybrid ventilation system equipped with heat recovery. One of the key challenges in designing the heat exchanger is to keep the pressure drop low. At the same time the heat recovery rate has to be high. The results from the measurements show that it is possible to design a water-to-air heat exchanger with a temperature efficiency of approximately 80% with a pressure drop of about 1 Pa at air flows corresponding to 0.35 L/(s∙m²) building area. This type of ventilation system has the potential to offer a high thermal comfort, high heat recovery rate at the same time as the electrical consumption from fans is kept low. Old buildings with a natural ventilation system without heat recovery could also be retrofitted with this type of ventilation system.
Henrik Davidsson; Ricardo Bernardo; Bengt Hellström. Theoretical and Experimental Investigation of a Heat Exchanger Suitable for a Hybrid Ventilation System. Buildings 2013, 3, 18 -38.
AMA StyleHenrik Davidsson, Ricardo Bernardo, Bengt Hellström. Theoretical and Experimental Investigation of a Heat Exchanger Suitable for a Hybrid Ventilation System. Buildings. 2013; 3 (1):18-38.
Chicago/Turabian StyleHenrik Davidsson; Ricardo Bernardo; Bengt Hellström. 2013. "Theoretical and Experimental Investigation of a Heat Exchanger Suitable for a Hybrid Ventilation System." Buildings 3, no. 1: 18-38.
One of the biggest obstacles to economic profitability of solar water heating systems is the investment cost. Retrofitting existing domestic hot water heaters when a new solar hot water system is installed can reduce both the installation and material costs. In this study, retrofitting existing water heaters for solar water heating systems in Swedish single-family houses was theoretically investigated using the TRNSYS software. Four simulation models using forced circulation flow with different system configurations and control strategies were simulated and analysed in the study. A comparison with a standard solar thermal system was also presented based on the annual solar fraction. The simulation results indicate that the retrofitting configuration achieving the highest annual performance consists of a system where the existing tank is used as storage for the solar heat and a smaller tank with a heater is added in series to make sure that the required outlet temperature can be met. An external heat exchanger is used between the collector circuit and the existing tank. For this retrofitted system an annual solar fraction of 50.5% was achieved. A conventional solar thermal system using a standard solar tank achieves a comparable performance for the same total storage volume, collector area and reference conditions.
Luis R. Bernardo; Henrik Davidsson; Björn Karlsson. Retrofitting Domestic Hot Water Heaters for Solar Water Heating Systems in Single-Family Houses in a Cold Climate: A Theoretical Analysis. Energies 2012, 5, 4110 -4131.
AMA StyleLuis R. Bernardo, Henrik Davidsson, Björn Karlsson. Retrofitting Domestic Hot Water Heaters for Solar Water Heating Systems in Single-Family Houses in a Cold Climate: A Theoretical Analysis. Energies. 2012; 5 (10):4110-4131.
Chicago/Turabian StyleLuis R. Bernardo; Henrik Davidsson; Björn Karlsson. 2012. "Retrofitting Domestic Hot Water Heaters for Solar Water Heating Systems in Single-Family Houses in a Cold Climate: A Theoretical Analysis." Energies 5, no. 10: 4110-4131.
The work presented in this article aims to investigate a PV/T hybrid solar window on a system level. A PV/T hybrid is an absorber on which solar cells have been laminated. The solar window is a PV/T hybrid collector with tiltable insulated reflectors integrated into a window. It simultaneously replaces thermal collectors, PV-modules and sunshade. The building integration lowers the total price of the construction since the collector utilizes the frame and the glazing in the window. When it is placed in the window a complex interaction takes place. On the positive side is the reduction of the thermal losses due to the insulated reflectors. On the negative side is the blocking of solar radiation that would otherwise heat the building passively. This limits the performance of the solar window since a photon can only be used once. To investigate the sum of such complex interaction a system analysis has to be performed. In this paper results are presented from such a system analysis showing both benefits and problems with the product. The building system with individual solar energy components, i.e. solar collector and PV modules, of the same size as the solar window, uses 1100 kW h less auxiliary energy than the system with a solar window. However, the solar window system uses 600 kW h less auxiliary energy than a system with no solar collector.
Henrik Davidsson; Bengt Perers; Björn Karlsson. System analysis of a multifunctional PV/T hybrid solar window. Solar Energy 2012, 86, 903 -910.
AMA StyleHenrik Davidsson, Bengt Perers, Björn Karlsson. System analysis of a multifunctional PV/T hybrid solar window. Solar Energy. 2012; 86 (3):903-910.
Chicago/Turabian StyleHenrik Davidsson; Bengt Perers; Björn Karlsson. 2012. "System analysis of a multifunctional PV/T hybrid solar window." Solar Energy 86, no. 3: 903-910.
A building-integrated multifunctional PV/T solar window has been developed and evaluated. It is constructed of PV cells laminated on solar absorbers placed in a window behind the glazing. To reduce the cost of the solar electricity, tiltable reflectors have been introduced in the construction to focus radiation onto the solar cells. The reflectors render the possibility of controlling the amount of radiation transmitted into the building. The insulated reflectors also reduce the thermal losses through the window. A model for simulation of the electric and hot water production was developed. The model can perform yearly energy simulations where different features such as shading of the cells or effects of the glazing can be included or excluded. The simulation can be run with the reflectors in an active, up right, position or in a passive, horizontal, position. The simulation program was calibrated against measurements on a prototype solar window placed in Lund in the south of Sweden and against a solar window built into a single family house, Solgården, in Älvkarleö in the central part of Sweden. The results from the simulation shows that the solar window annually produces about 35% more electric energy per unit cell area compared to a vertical flat PV module
Henrik Davidsson; Bengt Perers; Björn Karlsson. Performance of a multifunctional PV/T hybrid solar window. Solar Energy 2010, 84, 365 -372.
AMA StyleHenrik Davidsson, Bengt Perers, Björn Karlsson. Performance of a multifunctional PV/T hybrid solar window. Solar Energy. 2010; 84 (3):365-372.
Chicago/Turabian StyleHenrik Davidsson; Bengt Perers; Björn Karlsson. 2010. "Performance of a multifunctional PV/T hybrid solar window." Solar Energy 84, no. 3: 365-372.