A5072208593- Phase Change Materials Research
- Solar Thermal and Photovoltaic Systems
- Building Energy and Comfort Optimization
- Adsorption and Cooling Systems
- Heat Transfer and Optimization
- Radiative Heat Transfer Studies
- Solar Energy Systems and Technologies
- Solar-Powered Water Purification Methods
- Numerical methods in inverse problems
- Topology Optimization in Engineering
- Solidification and crystal growth phenomena
- Heat Transfer Mechanisms
- Greenhouse Technology and Climate Control
- Heat Transfer and Boiling Studies
- Hygrothermal properties of building materials
- Metallurgical Processes and Thermodynamics
- Spacecraft and Cryogenic Technologies
- Integrated Energy Systems Optimization
- Hybrid Renewable Energy Systems
- Fluid Dynamics and Heat Transfer
- Advanced Thermoelectric Materials and Devices
- Risk and Portfolio Optimization
- Neural Networks and Applications
- Process Optimization and Integration
- Building energy efficiency and sustainability
Brno University of Technology
2015-2024
The costs of fuels and energy in the Czech Republic have rapidly increased last two decades. This situation market has bolstered interest development heating cooling systems utilizing renewable sources, especially solar energy. utilization sources residential office buildings very often requires an effective way thermal storage. Thermal storage is essential part most systems. gains through transparent building envelope can reduce consumption for during season thus saving from conventional...
The paper reports experimental and numerical investigation of the melting front propagation in a paraffin-based phase change material (PCM). investigated case was block PCM with heat flux introduced at one its sides. contained transparent container thus could be monitored camera. temperature 28 °C located an environmental chamber where ambient maintained 27 during experiment. natural convection melted played important role it had to considered transfer models. models taking into account...
Simulations of the behaviour a solar air collector with integrated latent heat thermal storage were performed. The model was created use coupling between TRNSYS 17 and MATLAB. Latent (Phase Change Material - PCM) absorber. absorber in MATLAB itself TYPE 56. allows specification PCM properties as well other parameters. simulated front back pass middle cavity. Two variants considered for comparison; light-weight made sheet metal heat-storage PCM. performed climatic conditions Czech Republic...
The fast and accurate modeling of phase change is a significant importance in many processes from steel casting to latent heat thermal energy storage. paper presents numerical case study on the transient 3D diffusion problem with change. Three different approaches solid–liquid combination four commonly used schemes are compared for their efficiency, accuracy, applicability, simplicity implementation, robustness. possibility parallel decomposition also discussed. results indicate that best...
The paper deals with the comparison of one-dimensional (1D) and three-dimensional (3D) models a thermally activated wall panel microencapsulated phase change material. 3D model was created in off-the-shelf simulation tool COMSOL Multiphysics. 1D an in-house developed TRNSYS type. main advantage is short computation time but it comes at expense lower accuracy less detailed results. In most building performance simulations, however, knowledge temperature distribution over surface not...
The energy saving potential (ESP) of passive cooling buildings with the use an air-PCMheat exchanger (cold storage unit) was investigated through numerical simulations. One goals study to identify phase change temperature a PCM that would provide highest under specific climate and operating conditions. considered air-PCM heat contained 100 aluminum panels filled PCM. had thermal capacity 200 kJ/kg in range 4 ∘ C. used cool down outdoor air supplied building during day, accumulated rejected...
The paper presents a parametric study evaluating the effects of various predictive controls on operating parameters heat pumps. pump represents significant power appliance in residential sector. Its connection to accumulator creates system with considerable potential control electricity consumption according needs grid. air-water is considered this study. A used for priority operation at periods peak production from renewable sources. following were tested as control: outdoor air...
Experiments have been carried out in order to investigate the stabilization of water temperature with a water-PCM heat exchanger. The exchanger was rather simple design. It round tube, through which flowed, surrounded an annular layer PCM. divided into one meter long segments (modules) and monitored at outlet each segments. A paraffin-based PCM melting 42 °C used experiments. experimental set-up consisted two reservoirs kept different temperatures, exchanger, PC controlled valves data...
A study into the performance of a solar chimney and photovoltaic (PV)-powered fan for ventilation applications was carried out using numerical simulations. The compared with that direct current (DC) powered by PV panel. comparison same area irradiated surface—the absorber plate in case panel photovoltaic-powered fan. two studied cases were under various radiation intensities incident radiation. results indicate PV-powered fans significantly outperform chimneys terms converting energy kinetic...
The paper presents a theoretical parametric study into latent heat thermal energy storage (LHTES) employing polymeric hollow fibres embedded in phase change material (PCM). of five inner diameters between 0.5mm and 1.5mm are considered the study. effectiveness-NTU method is employed to calculate performance LHTES unit shell-and-tube design. results indicate that PCM can mitigate drawback low conductivity materials. For same packing fraction, total transfer rates fluid increase with...
Experiments were carried out in an environmental chamber with the aim to monitor melting front propagation a rectangular cavity filled paraffin-based Phase Change Material (PCM). The PCM was contained transparent containers heat flux introduced by means of electric heating element. stabilized power source used maintain constant output elements. experiments performed for at side wall container and upper surface PCM. RT28HC phase change temperature 28 °C experiments. maintained monitored...