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Poster introductions 09: LCA, sustainable development
Time: 25/Aug/2021: 11:40am-12:00pm · Location: Room 4 - Room 015, Building: 116
Re-making the Energy Profile of (Irish) Market Towns, as if Science Matters.
University of Ulster, Jordanstown, Ireland
CONTEXT:- nZEB policy in Ireland is a combination of cost optimality principles, with an emerging low carbon electrical grid. The policy focuses not on significantly reducing actual energy use, but on facilitating macro-generational efficiencies combined with a singular nZEB metric of micro-operational energy efficiency. Implementation defaults to generic solutions of individual electrical heat pumps serving individual buildings without measurement of the efficacy of such extensive resources use.
PROBLEM:- This policy increasingly lacks coherence when faced with the greater proportionality of embodied carbon reflected in construction materials and methodologies. Additionally, in setting it’s energy saving target too low, nZEB policy will create significant future pressures on our electrical grid and ignores the reality that all buildings now, should effectively be looking to serve our future 2050 reduction targets. The generic ‘low-carbon’ heat pump solution is valid in some contexts, however within Irish traditional market towns, where building fabric is high in embodied carbon and rich in historical patterns and morphology, the solution is not so obvious. In a more direct way, treating our future building stock as an integrated whole, related to energy context and energy grid environment is helpful in understanding optimal energy solutions.
OPPORTUNITY:- The proposed paper is an investigation into how community-based energy-saving initiatives, combined with new energy-plus developments within our historic centres, would amplify the energy importance of our building fabric. Such initiatives would re-make our planning and urban design process and increase the energy integrity and resilience of our communities. All constructions must justify their use of resources by delivering significantly greater energy performance standards, beyond nZEB, and the nonchalance by which we have demolished older buildings in the past will no longer be considered unimportant to the global carbon challenge. This creates an opportunity to remake the energy profile of our Irish market towns.
Session 15: RES (Renewable energy systems)
Time: 25/Aug/2021: 4:00pm-5:30pm · Location: Room 4 - Room 015, Building: 116
Energy demand for roof mounted heating snow load mitigation systems.
1Norwegian University of Life Science, Norway; 2University of Innsbruck, Austria
Roof mounted solar PV systems have become a widespread use of roof surfaces on existing buildings. Particularly flat roofs on existing storage buildings and warehouses is a secure alternative to install PV panels out of reach to the public. Such solar power plants add significant load to the roof, which uses some of the load capacity originally designated for snow load. To allow for installing roof mounted solar systems on existing buildings without compromising the structural reliability of the building, one strategy is to run the solar PV panels in “reverse mode” i.e. to use electric power to generate heat and further melt away snow from the solar panels. The success of this strategy relies on several parameters, such as the amount of snow which needs to be melted, the solar radiation, the air temperature and wind velocity i.e. the turbulent surface heat transfer. All these parameters determine the electricity demand for melting enough snow to sustain the reliability of a roof in different climates. In this study, a point-scale, physically based energy balance snow model (ESCIMO) is used for simulating snow accumulation and ablation on a roof with variable installed power for snow melting. Different strategies for when to melt snow are tested and the energy demand for different situations is investigated. The study describes which melting strategies are suitable for different climates and quantifies the required energy demand for keeping the snow load under a target lever for buildings with added solar PV panels or roof mounted heating systems for mitigating snow load. The results show that the average melting energy is between 2-25 kWh/m2 depending on the climate and the melting strategy and that a melting system requires more than 100/m2 kWh to have significant effect
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