The selection and design of air conditioning systems in Hungary are based on a determined modelling state. In the last decade this was a safe enough basis for the management of systems. As a result of the changes in the macroclimate, however, there has been a major increase in summer temperatures. Taking into account this fact and the need to develop the earlier deterministic modelling techniques we chose to focus on risk-based modelling.
This paper describes a comparison between internal and external run-time coupling of CFD and building energy simulation software. Internal coupling can be seen as the traditional way of developing software, i.e. the capabilities of existing software are expanded by merging codes. With external coupling, two or more software packages run simultaneously while exchanging calculation results at appropriate time intervals.
The conversion of CAD models into 3D Cartesian-defined geometries is presented, and a two-pass algorithm to perform the transformation is described. The methodology for implementing the numerical solution of fire dynamics problems involving the FDS simulation program is tested. The results from these predictions are visualized on the original geometry using elements which take into account the optical properties of the phenomena for a realistic rendering of smoke and fire.
The airflow conditions in an experimental pig housing unit are examined both experimentally and numerically (simulation) with particular focus on the airflow conditions in the occupational zone of the animals. Two heating setups are used, and the temperature is measured in a horizontal profile at the floor and at the ceiling. Good concordances between the measurements and the simulations are reached at the floor level. At the ceiling level, the conformity to the measuring results is unsatisfactory.
The capture efficiency of the total system must be guaranteed so that the spread of impurities throughout the kitchen is prevented. A capture efficiency model is derived and it is used to estimate the efficiency of a ventilated ceiling. This paper demonstrates that a simple equation that includes the average contaminant level in the occupied zone and the exhaust concentration could be a suitable platform for capture efficiency analysis in both measurements and simulations.
Within the last years CFD has become an essential tool to investigate and optimize concepts of train coaches during an early design stage to achieve best results without major modifications of the final design. The simulation of the current railroad double deck coach gives some special challenges because of the complex channel system and the different boundary conditions on each floor. First the air duct including the outlet vents is investigated and optimized. The results are used as boundary condition for the simulation of the passenger's compartment.
The main motivation behind research on control of the thermal environment inside a vehicle cabin, is since long time thermal comfort for the passengers. However, the consequences of bad thermal control in vehicle cabs go beyond the aspect of personnel thermal comfort: the processes of driver sleepiness and fatigue, two major causes for traffic accidents worldwide, are unambiguously
influenced by the present thermal comfort. This research intends to make a start with the integration
A new standard, ISO/DIS 14505 is under preparation, dealing with the assessment of the thermal environment in vehicles, based on the equivalent temperature. The scope of this paper is to demonstrate the different results obtained when evaluating the thermal environment inside a vehicle, using the three well known parameters, air temperature, operative temperature and equivalent temperature. The tests were carried out in the winter season during heat-up of the vehicle cabin.
Fläkt Woods, which manufactures a wide range of ventilation equipment, has undertaken a programme of experimental verification of the concepts of new displacement ventilation equipment, as well as validation of a CFD (Computational Fluid Dynamics) package
The paper deals with on-site measurements of energy benefits resulting from exploitation of double-skin solar energy façade for pre-heating of ventilating air. The southwards oriented façade with total area of 1135 m2 on a new building of Moravian Library
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