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Dynamic thermal behaviour of tabs in building energy retrofitting
Áreas de investigación
  • Ingeniería de construcción
In Mediterranean climate, Thermo-Active Building Systems (TABS) play a major role in building envelope integration, in terms of dynamic adaptation and thermal energy storage. In the case of building energy retrofitting and recovery of existing technologies, the integration of TABS compels the designers to assess their performance, by considering the variation of temperature distribution within the different materials over the time, thermal properties and boundary conditions. The designers shall also take into account the role of occupants, that constitute the final determining factor in terms of thermal comfort and utilizability of any building system, including thermal mass. In literature, TABS have not yet been extensively studied in the extent of the heterogeneity of materials, in terms of performance and management arrangements. Therefore, modeling and experimental validation of a dedicated monitoring system is needed in the interest of energy efficiency and control of these systems. This requires the identification of sensitive parameters which affect heterogeneous thermal mass performance. The case study is an office building, located at Calle Apolonio Morales, 29 (Madrid). The original horizontal structure was thermoactivated with an additional concrete mass of 7 cm. Floors perform like radiant elements during the working hours, like accumulators during the night. This allows to reduce consumption costs (night-time rate) and avoid load peaks during the morning. In winter, during the night, geothermal heat pumps work to pre-heat floors. In summer, free circulation of water and geothermal heat pumps work to pre-cool floors during the night. This strategy takes advantage of the structural mass inertia of the building. The control system monitors supply water temperature in the collectors and adjusts room temperature according to the set points. It acts on servo-powered valves, associated with the collectors, according to the signals received from air and pipe temperature sensors. Concrete slabs temperature is measured by two sensors per floor, connected to the control system: they provide limited information that refers to a few specific points of the slabs. A thermographic investigation enabled to realize a map of temperature variation on the interim floor surface during a typical winter working day. This analysis allowed taking awareness of the heterogeneity of materials: position of tubing affect heat transfer, including in relation to the proximity to collectors and the glazed façade, where the distance between tubes is concentrated to increase thermal emissions and to take advantage of solar gains. The variation of relation between bricks and joists is supposed to change thermal mass and thermal stability of the floors, that increase proportionally with the presence of joists. Future developments deal with the validation of a heat transfer model for heterogeneous radiant floors, along with the definition of dedicated operation strategies. A proper monitoring campaign is being prepared, by integrating the control system with a number of new sensors installed in well-studied locations. The sensitive parameters identified should be taken into account both in the design and the exploitation phases, including for the design of Building Management Systems, with the aim to take full advantage of thermal inertial properties and storage capability.
Nombre congreso
CITE 2019. International Conference on Technological Innovation in Building
Tipo de participación
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Título de las actas
Abstracts Book CITE 2019
Esta actividad pertenece a memorias de investigación
  • Autor: Rossana Laera
  • Autor: Inmaculada Martinez Perez (UPM)
  • Autor: Ricardo Tendero Caballero (UPM)
  • Autor: Luis de Pereda Fernández
  • Autor: Rafael Tejedor López (ENERES. Sistemas Energéticos Sostenibles)
  • Autor: Francesco Iannone (DICATECh. Politécnico di Bari)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Patología de estructuras, protecciones colectivas y medios auxiliares de edificación.
  • Departamento: Construcciones Arquitectónicas y su Control
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