1:30pm - 1:45pm
Building-integrated Photovoltaics (BIPV) Combined with Hydrogen-based Electricity Storage System at Building-scale Towards Carbon Neutrality
1Building2050 group, Ecole Polytechnique Fédérale de Lausanne (EPFL),Fribourg, Switzerland; 2Energy Institute, University of Applied Science of Western Switzerland (HEIA-FR, HES-SO), Fribourg, Switzerland; 3TECPHY Sàrl, Renens (VD), Switzerland
Electricity storage technologies in buildings are evolving, mainly to reduce their environmental impact and to improve self-sufficiency of buildings that produce their own energy through Building-Integrated Photovoltaics (BIPV) installations. To maximize self-consumption – minimizing the import of grid electricity – photovoltaic (PV) systems can be coupled with a hydrogen storage system converting the electricity to hydrogen by electrolysis during the summer season – when the on-site production is higher – and employing it during the winter season with fuel cells. This study focuses on the sizing constraints of solar hydrogen systems at building-scale using an innovative research-centre that will be built in Fribourg (Switzerland). It presents four stories and a mix-usage (office spaces and research facilities areas) and multi-oriented PV installation in order to produce enough electricity to achieve at least 50% of electricity self-sufficiency ratio. Using the PV production, this study aims to optimise the sizing of a hydrogen storage system allowing to reach the required self-sufficiency ratio with the lowest environmental impact possible. Ultimately, the global energy and financial efficiency of the system will be analysed.
1:45pm - 2:00pm
A Review Onto The FIVA Project: Novel Windows Employing Vacuum Glazing Products
1TU WIen; 2Austrian Forest Products Research Society
Vacuum glazing products have been in development for the past decades. Such glazing products regularly feature two parallel glass panes that have a small, evacuated gap in their interstitial space. To maintain the vacuum and the form of the glass product, regularly vacuum tight edge seals and a grid of distance pillars are integrated. During the years of development, the major focus was set on the production and durability aspects of the glass products, but relatively few efforts had been conducted towards the integration of such glass products into window constructions. Employing typically used double- and triple glazing windows’ frames does not represent a feasible option. This is due to the specification given by vacuum glazing products, such as their small thickness and the requirement for sufficient glass edge coverage due to the major thermal bridge adjacent to the edge seal.
The authors, together with major players from the window producing industry, started a R&D effort that targeted disruptive new concepts for vacuum glass windows. Four different designs were developed that not only integrated vacuum glass products, but also featured unusual opening patterns, the latest generation of electrically driven fitting products, and specific seals. The thermal and acoustical performance of the prototypes was improved during the development via employment of numeric thermal simulation and lab testing. The present contribution illustrates the four prototypes and their performance, which – for instance- pertaining to the UW-value is down to 0.6-0.7 W.m-1.K-1 at a glass thickness of less than 1 cm.
2:00pm - 2:15pm
Operational Energy and Embodied Impacts Of Retrofitting Window Frames Of Mixed-mode Office Buildings
Universidade Estadual de Campinas, Brazil
Design decisions normally consider the building’s operational phase as the main criterion to reduce energy expenses in a building. In less efficient buildings, reducing the operational energy becomes the most important aspect to address in the design, construction and operational phases, for it represents the highest life cycle energy flow. However, energy-efficient solutions often reduce operational energy demand by increasing the building’s embodied energy and greenhouse gas emissions, which have been overlooked in energy performance analyses. This work aims at investigating the operational energy and the consequent embodied impacts resulting from the retrofit of the window frame of mixed-mode office buildings located in a hot climate, with a focus on reducing the cooling energy demand. The method consists of an experimental study based on a case study, in which the EnergyPlus and the SimaPro software tools are used to evaluate the operational energy and the environmental impacts. Results showed that reducing the WWR and increasing the window opening factor conveyed operational energy savings but in some retrofit scenarios tested, these retrofit measures were counterproductive from the CED and GWP perspective. The main scientific contribution of this work is understanding the importance of the building analysis from a life-cycle approach. The results obtained can assist companies and designers to make their decisions from a broader environmental perspective.
2:15pm - 2:30pm
Characteristics of Business Models for Innovation Clusters in Decarbonation Projects
1ZHAW, Switzerland; 2VITO, Belgium
The transformation of today’s electric power sector to a more sustainable energy production based on renewable energies will change the structure of the industry. In this transformation towards a smart energy system interaction between sectors and technologies the main stakeholders (energy service providers; utilities) will face new challenges in their traditional way of doing business. Therefore, adapting their business models to remain competitive is seen as an important step.
We chose to characterize these business models by content, structure and governance of transactions for creating value by exploiting business opportunities. In the energy sector the following characteristics to the business models for energy supply have been identified.
The most predominant archetypes of business models for the energy supply are presented and discussed. Further, we propose to set up (or use existing) innovation clusters, based on these promising BM to ensure that innovative business environments (innovation clusters) will grow that have the potential for upscaling and replication of District Decarbonization Solutions. There are no specific business models for energy supply applied to renovation of districts. Uncertainties in the supportive measures for the application of DER makes it difficult to develop new business models for the utilities.
2:30pm - 2:45pm
ECOPOOL+++: Developing a Sustainable Outdoor Heated Swimming Pool
1Universidade do Algarve, Portugal; 2Cristal Construções - Materiais e Obras de Construção Civil, Portugal; 3Itelmatis Control Systems, Portugal; 4Itecons, Portugal
The University of Algarve in consortium with Cristal Construções - Materiais e Obras de Construção Civil, Itelmatis control systems and ITeCons - Instituto de Investigação e Desenvolvimento Tecnológico para a Construção, Energia, Ambiente e Sustentabilidade is developing a new concept of outdoor heated sustainable swimming pool, with more energy efficient and with less environmental footprint. The main objective is to minimize water consumption and provide a comfortable temperature in use, in order to use the pool as long as possible in the year (at least 8 months in Algarve region), using only solar energy. To this end, different system will be tested, namely solar panels, inverted underfloor heating, heat accumulator exchanger with phase change materials and energy dissipating pipes. Including an innovative thermal insulation system from the interior of the pool tank and a new system for covering the water plane. All systems will be monitored in order to optimize the global operation. Which should result in a marketable intelligent and predictive control and monitoring system (SMART) to optimize the multiple variables in real time. One of the outputs of this project will be the construction of a semi-scale prototype of a swimming pool, with the characteristics mentioned above, in order to observe and validate the proposed developments.
2:45pm - 2:52pm
Bringing Students Closer To The Issues Of Indoor Environmental Quality And Technology Using nEMoS Device: An Experience In Albania
1ITC-CNR, Italy; 2Polis University, Albania
The article presents the outcomes of a monitoring campaign and a survey performed in a school building in Tirana. Included in the Bilateral Agreement between the National Research Council of Italy and the Ministry of Education and Sport of the Republic of Albania, the research is based on environmental analysis, collection of data from monitoring of environmental variables and students’ feedback. The monitoring of Indoor Environmental Quality (IEQ) was carried out with a nearable Environmental Monitoring System (nEMoS) for IEQ purposes, designed and developed by ITC-CNR based on the Do-It-Yourself (DIY) philosophy. The proliferation of the maker movement philosophy has promoted the diffusion of DIY-based technologies. The spread of this movement is observed outside schoolsbut there is a growing interest among educators to introduce this philosophy in the students’ education, approaching to STEAM (Science Technology Engineering Arts Mathematics) in a different and more stimulating way. The application of two nEMoS devices in two classrooms (in different locations) aroused the curiosity of students, bringing them closer to the world of technology with a practical example. It also increased their awareness about the overall IEQ conditions in the classrooms where they spend a considerable part of their lives.