prof. Ing. Václav Píštěk, DrSc.

1. Development of algorithms for solving heat and mass transfer with phase and structural changes using GPU

   The theme is aimed at the development of numerical algorithms designed primarily for solving heat transfer with phase transformations using high parallelization of code. For the solution should fully take advantage of special graphic processor units TESLA. Expected to use MATLAB and C + +. Algorithms can be network-oriented methods (eg method of control volumes) or mesh free methods.

   Supervisor: Štětina Josef, prof. Ing., Ph.D.

2. Heat exchangers with minichannels of different geometry

   Design and cooperation in manufacturing minichannels with diameter 0,25 to 3mm. Design and cooperation in manufacturing and calibration of experimental rig. Measurements of heat transfer coefficient and pressure losses in smooth minichannels with diameters of 0,25 to 3mm and assumed Reynolds number 500 to 3000. Design of minichannel with intensified heat transfer surface, experiments and comparions with smooth minichannels

   Supervisor: Jícha Miroslav, prof. Ing., CSc.

3. Hygienic and microbiological hazards in HVAC

   Effort for reduction of energy consumption in buildings leads to using more complicated and sophisticated HVAC systems. On the other hand, these devices bring risks of undesirable effects – encouragement of growth of microbes or moulds, odor production etc., which consequently worsen an indoor environment. These hazards are known for a relatively long time, however, in our country they have attracted an attention only in a recent period. The work is to be focused on three areas: - Prediction of possible types of hygienic and/or microbiological foulness in HVAC components. - Assessment of risks of their creation due to operating conditions. - In-situ monitoring of selected existing devices. The background research is to summarize possible hygienic and/or microbiological hazards, factors of their formation and enlargement, and possibilities of their elimination. The experimental work is to be focused on monitoring of real devices, sampling and evaluation of specimens of contamination (in cooperation with specialized institutes).

   Supervisor: Jaroš Michal, doc. Ing., Dr.

4. Image processing in fluid mechanics problems and Environmental Engineering

   The aim is to develop programs based on the integrated development environment from National Instrument IMAQ image processing problems in fluid mechanics and environmental engineering. They will used of modern hardware components to enable parallel processing, such as multicore processors and FPGAs. Problems can be tackled flow visualization using smoke and bubbles (evaluation, geometry and homogeneous current fluctuations of movement, the current interaction with the environment, the application of 2D images, possibly in 3D) or detection of particles in the images of optical, phase-contrast and, if present. electron microscope: fibers, pollen, porous particles (determination of geometrical parameters: length, diameter, porosity, particle counting, classification).

   Supervisor: Štětina Josef, prof. Ing., Ph.D.

5. Numerical simulation of ground heat exchangers – direct and inverse task

   Air or brine ground heat exchangers (GHE) are used for pre-heating of ventilating air using ground heat. They can be used for cooling of air during summer season as well. Their effectiveness should be preliminary assessed using numerical simulation. Most of existing numerical models are based on analytical evaluation of temperature in semi-infinitive ground solid, which is non-affected by GHE. For more exact simulation, the problem of heat conduction in surrounding ground is needed to consider. It means, two- or three-dimensional unsteady conduction task should be solved. On the other hand, the thermal diffusivity of the soil has to be known for this solution. However, this parameter can difficulty evaluate with common measuring methods without affecting of the specimen. Therefore, the inverse task of heat conduction should be solved as a next step, so that the thermal diffusivity could be determined from known temperature behavior in different ground depths. For both these problems, the operating data from the newly built air GHE of Energy Institute are supposed to be employed.

   Supervisor: Jaroš Michal, doc. Ing., Dr.

6. Optimization of cooling surfaces based on modern methods suitable for high parallelization

   The theme is aimed at the development of modern optimization methods and their use to optimize the cooling of hot surfaces in the metallurgical and metallurgical plants. The aim is to focus on high parallelization of tasks suitable for modern multi-core CPUs, GPUs and FPGAs. Expected to use MATLAB and C + +.

   Supervisor: Štětina Josef, prof. Ing., Ph.D.

7. Simulation tool to predict conditions in a cabin of traffic means

   To develop simulation tool to predict thermal response of car (alternatively small aircraft) taking into account transient phenomena as well as solar radiation and radiation heat transfer between surfaces. To study influence of various parameters, like thermal capacity, conductivity, cabin occupancy etc.

   Supervisor: Jícha Miroslav, prof. Ing., CSc.

8. Smart mobile data acqusition system for environmental engineering

   The theme is aimed at the development of modern measuring system based on hardware and software from National Instrument. In particular, take advantage of a Real-time operating systems and FPGA technology.

   Supervisor: Štětina Josef, prof. Ing., Ph.D.

9. Smooth particle hydrodynamics (SPH) method for the solution of flow field

   To perform critical a study and analysis of different meshfree methods and the assessment of their use for the solution of flow field. To develop a meshless computational method (Smooth particle hydrodynamics SPH) with application to fire and smoke spread.

   Supervisor: Jícha Miroslav, prof. Ing., CSc.

10. Study of human comfort inside car/aircraft cabin using simulator - thermal manikin

    To study influence of various measures to reduce heat loads of human body in car/aircraft cabin. The study will focus on optimal function of cooling/heating, various surface reducing heat penetration into the cabin, cooled/heated seats, etc.

    Supervisor: Jícha Miroslav, prof. Ing., CSc.

11. Study of particles transport and deposition in multiple branching of airways

    Experimental research on transport and deposition of particles of different charakteristice and size in multiple airways branching (e.g. human respiratory tract). Study of relatioship between sources of particles and their receptors (sitting passanger in the cabin) using thermal manikin with breathing option and filters. Study of penetration of large porous particles and comparison with nonporous particles. Use of different techniques to study deposition (gravimetry, fluorescence) and transport (several methods e.g. PDA). Study in steady as well as cyclic regimes.

    Supervisor: Jícha Miroslav, prof. Ing., CSc.

12. Study of twin-fluid nozzles and atomization process of liquids in broad spectrum of viscosities

    To give an overview and classification of published designs of twin-fluid internal-mixing atomizers. To chose several the most prosperous atomizers, optimize their geometry based on publish data and fabricate them for experimental study. To upgrade present cold spray test bench for twin-fluid atomizers and extend the test bench for usage of different liquids. To test these atomizers in wide range of operation pressures and GLR and with several liquids of different viscosity. To study and compare directly their atomization characteristics with focus on atomization efficiency and spray steadiness. To describe spray structure of the selected twin-fluid atomizers and to elucidate their break-up mechanism in detail. in numerical simulations as input data.

    Supervisor: Jícha Miroslav, prof. Ing., CSc.

13. The optimization attenuation of fluid temperature oscillations using latent heat thermal storage

    The scope of the theme is the attenuation of fluid temperature oscillations by means of latent heat thermal storage. The phase change of matter at constant pressure is almost an isothermal process and it is associated with the transfer of huge amount of heat (latent heat). This phenomenon can be employed in order to attenuate oscillations of fluid temperature. The investigations will focus on the attenuation characteristics of latent heat thermal storage with regard to thermal properties of the thermal storage material (heat of fusion, thermal conductivity). The studied cases will include the step change of fluid temperature and the periodic changes of fluid temperature (square wave, sinusoidal). The attention will be paid to the attenuation characteristics of latent heat thermal storage for various amplitudes and frequencies of the fluid temperature changes.

    Supervisor: Štětina Josef, prof. Ing., Ph.D.