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Heschl, Christian
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Official Name
Heschl, Christian
Alternative Name
Heschl, C
Main Affiliation
Akademische Titel
Prof.(FH) Dipl.-Ing. (FH) Dr.
Email
christian.heschl@fh-burgenland.at
Scopus Author ID
50161591800
Status
staff
Research Outputs
Now showing 1 - 10 of 36
- PublicationInnovative central building energy management(9th International Conference on Indoor Climate of Buildings, Štrbské pleso 2016, 2016-11-29)
; ; Paar, Klaus448 1 - PublicationPrecipitation of Coarse Fly Ash Particles in Wood Chip Boilers - A Comparison of Experimental and Numerical Investigations(2015-06-01)
;Lamprecht, M. ;Hofmeister, G126 1 - Publication
153 1 - PublicationNonlinear eddy viscosity modeling and experimental study of jet spreading ratesIndoor airflow pattern is strongly influenced by turbulent shear and turbulent normal stresses that are responsible for entrainment effects and turbulence-driven secondary motion. Therefore, an accurate prediction of room airflows requires reliable modeling of these turbulent quantities. The most widely used turbulence models include RANS-based models that provide quick solutions but are known to fail in turbulent free shear and wall-affected flows. In order to cope with this deficiency, this study presents a nonlinear k-ε turbulence model and evaluates it along with linear k-ε models for an indoor isothermal linear diffuser jet flow measured in two model rooms using PIV. The results show that the flow contains a free jet near the inlet region and a wall-affected region downstream where the jet is pushed toward the ceiling by entrainment through the well-known Coanda effect. The CFD results show that an accurate prediction of the entrainment process is very important and that the nonlinear eddy viscosity model is able to predict the turbulence-driven secondary motions. Furthermore, turbulence models that are calibrated for high Reynolds free shear layer flows were not able to reproduce the measured velocity distributions, and it is suggested that the model constants of turbulence models should be adjusted before they are used for room airflow simulations.
129 1Scopus© Citations 10 - Publication
163 1 - PublicationDevelopment of an innovative blind control strategy to increase the thermal comfort of an office building(Konferenzbeitrag zur internationalen Konferenz „Indoor Climate of Buildings 2019“, 2019)
; ; 2 3 - PublicationTowards distributed enthalpy measurement in large-scale air conditioning systems(IEEE, 2015)
;Sauter, Thilo ;Steiner, Harald ;Glatzl, Thomas ;Hortschitz, Wilfried; Air conditioning systems are among the major energy consumers in buildings. Energy-efficient operation of AC systems is an important step towards better energy management in building automation, but requires efficient monitoring of the energy or enthalpy flows within the AC installation, which is currently still difficult because of the lack of appropriate equipment. This paper introduces a distributed data acquisition system for large-scale AC systems based on low-cost flow sensors implemented by means of standard printed circuit board technology and interconnected via a wireless sensor network. A critical issue for the system installation is the placement of the sensors in the air ducts to obtain representative measurements of the air flow. To this end, extensive aerodynamical simulations are carried out to analyze the flow distributions in typical building blocks for air ducts, particularly with respect to turbulences. The simulation results are compared with experimental data from the literature and are shown to be reliable.145 1Scopus© Citations 7