Disaggregation process for dynamic multidimensional heat flux in building simulation

Roberto Garay, Alberto Riverola, Daniel Chemisana, Roberto Garay Martinez

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    Heat transfer across envelopes (façade, roof, glazed areas) represents a big share of the energy flow within the heat balance of buildings. This paper focuses on areas of the envelope where multi-dimensional heat transfer occurs. These areas are commonly defined as thermal bridges, due to a localized reduction of thermal resistance of constructions in these places. This paper reviews common standardized methods to assess heat transfer in buildings, under various modelling assumptions: one-dimensional, multi-dimensional, steady state and dynamic. Within presently developed modelling and assessment methods, a need for improvement has been identified over existing methods for the thermal assessment of multi-dimensional heat transfer under dynamic conditions. A phasorial approach to differential heat transfer in thermal bridges has been developed, which serves as the dynamic extension of steady-state thermal bridge coefficients. This formulation is applied to the junction of a masonry wall with a concrete slab.
    Original languageEnglish
    Pages (from-to)298-310
    Number of pages13
    JournalEnergy and Buildings
    Volume148
    DOIs
    Publication statusPublished - 1 Aug 2017

    Keywords

    • Heat transfer
    • Multidimensional
    • Finite Difference
    • Thermal bridge
    • Heat bridge
    • Dynamic
    • Buildings
    • Envelopes
    • Simulation
    • Numerical calculation

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