Author
Heinz Brandl
Bio: Heinz Brandl is an academic researcher from Vienna University of Technology. The author has contributed to research in topics: Heat pump & Geothermal energy. The author has an hindex of 5, co-authored 12 publications receiving 875 citations.
Papers
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TL;DR: Energy foundations and other thermo-active ground structures, such as energy wells, pavement heating, and pavement heating represent an innovative technology that contributes to environmental protection and provides substan... as discussed by the authors.
Abstract: Energy foundations and other thermo-active ground structures, energy wells, and pavement heating represent an innovative technology that contributes to environmental protection and provides substan...
966 citations
TL;DR: In this paper, the authors focus on earth contact concrete elements that are already required for structural reasons, but which simultaneously work as heat exchangers, forming the primary circuit of a geothermal energy system.
34 citations
TL;DR: In this paper, the authors focus on near-surface geothermal geotechnics, i.e., energy piles and other energy foundations, energy walls, energy tunnels etc.
30 citations
TL;DR: In this article, an overview of significant dynamic aspects and rail track models is given, and a design model is presented, which allows the determination of the dynamic response in different rail track systems due to a load moving with constant speed.
Abstract: The dynamic behaviour of a railway system depends on the interaction of its three subsystems: the vehicles, the rail track and the subsoil. The motion of trains induces various dynamic effects on tracks. Vehicles moving with high speed generate waves, which propagate both to the track and the ground influencing the traction of the train significantly. In order to minimise the mentioned effects, specific designs for rail track systems are required. In this paper, an overview of significant dynamic aspects and rail track models is given. Furthermore, a design model is presented, which allows the determination of the dynamic response in different rail track systems due to a load moving with constant speed. The pavement and the rail are considered as an infinite flexible beam resting on continuous spring–dashpot elements simulating ideal high-speed rail tracks. The solution is found by transfer functions consisting of series approximation. Furthermore, a model is proposed that comprises an additional bedding ...
12 citations
01 Jan 2004
TL;DR: The dynamic load plate test with the Light Falling Weight Device (LFWD) is an innovative field test to determine the dynamic deformation modulus of soils and fill materials in earth works and ground engineering as discussed by the authors.
Abstract: The dynamic load plate test with the Light Falling Weight Device (LFWD) is an innovative field test to determine the dynamic deformation modulus of soils and fill materials in earth works and ground engineering. It is suitable to test compaction and to evaluate the bearing capacity of unbound fill materials in earth works. The paper presents theoretical and practical research results regarding the Light Falling Weight Device as well as its practical application. For the covering abstract see ITRD E128041.
7 citations
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TL;DR: Energy foundations and other thermo-active ground structures, such as energy wells, pavement heating, and pavement heating represent an innovative technology that contributes to environmental protection and provides substan... as discussed by the authors.
Abstract: Energy foundations and other thermo-active ground structures, energy wells, and pavement heating represent an innovative technology that contributes to environmental protection and provides substan...
966 citations
TL;DR: In this paper, the authors synthesize the results from three published field studies and illustrate some of the engineering behaviour of such piles during heating and cooling, using simplified load transfer mechanisms for a single pile subjected to pure thermal loadings (i.e. without mechanical load) and combined thermo-mechanical loadings.
Abstract: Energy piles are an effective and economic means of using geothermal energy resources for heating and cooling buildings, contributing to legislative requirements for renewable energy in new construction. While such piles have been used for around 25 years with no apparent detrimental effect, there is limited understanding of their thermo-mechanical behaviour. This paper synthesises the results from three published field studies and illustrates some of the engineering behaviour of such piles during heating and cooling. Simplified load transfer mechanisms for a single pile subjected to pure thermal loadings (i.e. without mechanical load) and combined thermo-mechanical loadings have been developed and are used to interpret the field data with regard to change in axial stress and shaft friction during heating and cooling. The effect of end restraint and ground conditions on the thermo-mechanical response of energy piles is discussed. Values of change in axial stress and mobilised shaft friction due to thermal...
327 citations
TL;DR: In this paper, a new 1D and 2D solid cylindrical source model for ground-coupled heat pump (GCHP) systems is presented to consider both the radial dimension and the heat capacity of the borehole or pile.
275 citations
TL;DR: In this paper, the authors provide a critical review of the analysis of heat transfer by borehole and foundation pile ground heat exchangers with an emphasis on different analytical models, including heat-source models, short-time models, models for energy piles, in situ thermal-response tests, indoor sandbox experiments, and parameter estimation as an inverse problem.
237 citations
197 citations