Browsing by Author "Erkoreka, Aitor"
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Item Comparison between Energy Simulation and Monitoring Data in an Office Building(2021-12-30) Martin-Escudero, Koldobika; Atxalandabaso, Garazi; Erkoreka, Aitor; Uriarte, Amaia; Porta, Matteo; EDIFICACIÓN DE ENERGÍA POSITIVA; Tecnalia Research & InnovationOne of the most important steps in the retrofitting process of a building is to understand its pre-retrofitting stage energy performance. The best choice for carrying this out is by means of a calibrated building energy simulation (BES) model. Then, the testing of different retrofitting solutions in the validated model allows for quantifying the improvements that may be obtained, in order to choose the most suitable solution. In this work, based on the available detailed building drawings, constructive details, building operational data and the data sets obtained on a minute basis (for a whole year) from a dedicated energy monitoring system, the calibration of an in-use office building energy model has been carried out. It has been possible to construct a detailed white box model based on Design Builder software. Then, comparing the model output for indoor air temperature, lighting consumption and heating consumption against the monitored data, some of the building envelope parameters and inner building inertia of the model were fine tuned to obtain fits fulfilling the ASHRAE criteria. Problems found during this fitting process and how they are solved are explained in detail. The model calibration is firstly performed on an hourly basis for a typical winter and summer week; then, the whole year results of the simulation are compared against the monitored data. The results show a good agreement for indoor temperature, lighting and heating consumption compared with the ASHRAE criteria for the mean bias error (MBE).Item Mathematical development of an average method for estimating the reduction of the Heat Loss Coefficient of an energetically retrofitted occupied office building(2019-06-01) Uriarte, Irati; Erkoreka, Aitor; Giraldo-Soto, Catalina; Martin, Koldo; Uriarte, Amaia; Eguia, Pablo; EDIFICACIÓN DE ENERGÍA POSITIVA; Tecnalia Research & InnovationThe performance gap between the design energy consumption of buildings and their real energy consumption has three main sources: the energy systems’ performance, the users’ behaviour and the buildings’ envelope performance. The latter should be characterized under in-use conditions by estimating their in-use Heat Loss Coefficient (HLC). This work further develops an existing ‘average method’ by fully developing it from the energy conservation principle applied to a generic in-use building. Furthermore, the uncertainty sources are identified and limited through the mathematical development of the method. An innovative solution to the problematic of multizone buildings is also demonstrated, where HLC values should be calculated for different floors and then aggregated to obtain the entire building's HLC. Furthermore, all these can be done without the need of a detailed model of the building. The improved average method has been applied to an occupied, energetically monitored office building of the University of the Basque Country. The building was energetically rehabilitated during the summer of 2017. Therefore, the proposed method has been applied over the three winters prior to rehabilitation and then, to the winter after the rehabilitation. It has thus been possible to estimate a 28% reduction of the HLC for the post-retrofitted case, as compared to the pre-retrofitted one.Item Vacuum Insulation Panels in Building Sector: Case study in Spain of Vacuum insulation panels in construction for energy efficient retrofitting of buildings(University of A Coruna and Asoc, 2020) Aparicio, Xabier; Erkoreka, Aitor; Del Portillo, Luis Alfonso; Giraldo, Catalina; Uriarte, Amaia; Eguia, Pablo; Sanchez-Ostiz, Ana Maria; Alvarez, Jorge Rodriguez; Goncalves, Joana Carla Soares; Goncalves, Joana Carla Soares; Goncalves, Joana Carla Soares; EDIFICACIÓN DE ENERGÍA POSITIVA; Tecnalia Research & InnovationWith the installation of 1800 m2 of Vacuum Insulation Panels in the entire opaque facade of an existing building, it has been demonstrated that the use of Vacuum Insulation Panels is possible in energy efficient building retrofitting, even in complex facades with low modularity. It has also shown the possibility of using Vacuum Insulation Panels in larger construction works. After the works, the state of the facade has been monitored. Damaged panels have been quantified during the construction phase and one year after the completion of the works. This work presents the lessons learnt during the design and installation process of the vacuum insulation panel integrating solutions, including the key improvements that are necessary to be implemented in the VIPs production process to guarantee their technical and economical viability for their use in edification.Item Vacuum insulation panels in construction solutions for energy efficient retrofitting of buildings. Two case studies in Spain and Sweden(2019-08-15) Uriarte, Amaia; Garai, Iñigo; Ferdinando, Andrew; Erkoreka, Aitor; Nicolas, Olatz; Barreiro, Eneritz; EDIFICACIÓN DE ENERGÍA POSITIVA; Tecnalia Research & Innovation; LABORATORIO DE TRANSFORMACIÓN URBANA; GENERALVacuum insulation panels (VIPs) represent a huge opportunity to achieve nearly zero energy buildings, especially in the retrofitting of existing buildings. VIPs can be applied in conjunction with façade cladding elements, considerably reducing the heat losses or gains from the building by means of very slim wall construction systems or retrofit solutions. However, the fact that VIPs cannot be cut on-site, can be easily damaged during their handling, installation and use and have an envelope that can cause thermal bridging in the junction between panels or when combined with other materials, has hindered their penetration in the construction market. This paper presents two innovative façade retrofitting solutions, a rear ventilated façade and a stud mounted internal solution, that have tackled all these issues and provide thermal transmittances of 0.28 and 0.14 W/m2 K in relatively slim insulation systems of 10 cm widths. Solutions have been installed on the entire façade of two existing buildings located in Bilbao (Spain) and Malmö (Sweden) subjected to an integral rehabilitation process, covering 2100 m2. Buildings energy use have been monitored before and after the renovation, showing energy cuts of around 35% from pre-intervention status. This paper presents the lessons learnt during the design and installation process of the vacuum insulation integrating solutions in the façade of two existing buildings and the thermal performance results achieved after their retrofitting.