A5086939224- Heat Transfer and Optimization
- Mechanical and Thermal Properties Analysis
- Heat Transfer and Boiling Studies
- Heat Transfer Mechanisms
- Nanofluid Flow and Heat Transfer
- Thermal properties of materials
- Textile materials and evaluations
- Solar Thermal and Photovoltaic Systems
- Thermal Analysis in Power Transmission
- Refrigeration and Air Conditioning Technologies
- Aerodynamics and Fluid Dynamics Research
- Lattice Boltzmann Simulation Studies
- Thermal Radiation and Cooling Technologies
- Adsorption and Cooling Systems
- Radiative Heat Transfer Studies
- Greenhouse Technology and Climate Control
- Mechanical Behavior of Composites
- Building Energy and Comfort Optimization
- Solar Energy Systems and Technologies
- Phase Change Materials Research
- Fiber-reinforced polymer composites
- Gas Dynamics and Kinetic Theory
- Polymer Foaming and Composites
- Photovoltaic System Optimization Techniques
- Fluid Dynamics and Heat Transfer
Brno University of Technology
2016-2022
A novel heat exchanger for automotive applications developed by the Heat Transfer and Fluid Flow Laboratory at Brno University of Technology, Czech Republic, is compared with a conventional commercially available metal radiator. The transfer surface this composed polymeric hollow fibers made from polyamide 612 DuPont (Zytel LC6159). cross-section radiator identical to aluminum (louvered fins on flat tubes) in Skoda Octavia measures 720 × 480 mm. goal study compare functionality performance...
Warm wastewater can be used as a source of heat for pumps in buildings such gyms, swimming pools, and laundries. Unfortunately, exchangers installed sewage channel are negatively affected by fouling because deposits on the exchange surface create additional resistance to transfer decrease efficiency system. Heat consisting polypropylene hollow fibers were prepared tested from two types wastewater: shower laundry. It was found that these devices have high thermal performance (with an overall...
Thermal performance of small liquid cooling systems based on polymeric hollow fibers was experimentally studied for the automotive lighting components integrated with high power Light Emitting Diodes (LEDs). Firstly, tests control electric heaters a printed circuit board (PCB) were performed to precisely measure thermal performance. The effect system installed PCB Skoda Octavia 4 (SK38) and Enyaq (SK316) tested as second step. Results testing show that proposed plastic radiators ensure...
Abstract Plastic immersed heat exchangers are used in various applications where chemically neutral and noncorrosive equipment is required. Their potential competitors, namely, polymeric hollow‐fiber bundles, were investigated. Three different fiber bundles tested as coolers of a hot reservoir. Two types polypropylene hollow fibers with outside diameters employed. Fibers twisted curvature to achieve better distribution improve natural convection on their outer surface. Calculation by...
Currently, liquid-to-gas heat exchangers in buildings, domestic appliances and the automotive industry are mainly made of copper aluminum. Using plastic instead metal can be very beneficial from an economic environmental point view. However, it is required that a successful design meets all requirements exchangers. The polymeric hollow fiber exchanger studied this work completive to common finned Due its unique (the use thousands thin-walled microtubes connected parallel), achieves high...
The use of adhesive joints has increased in recent decades due to their competitive features comparison with other joining methods. They can be used specific applications where there is no possibility alternative connection techniques. Adhesive bonding was assemble the prototype a high-temperature car radiator (operated up 125 °C) total 12,240 plastic tubes. This work aims estimate shear strength different adhesives intended for plastics above-mentioned radiator. Fourteen commercial were...
This article deals with fatigue tests of polymeric hollow fibre heat transfer surfaces. The fibres have an outer diameter between 0.5-0.8 mm and wall thickness 10 % the diameter. These plastic surfaces some limitations but also many benefits. One is durability under loading. were subjected to pulsating pressure loads different conditions (level pressure, ambient temperature, number cycles). Firstly, only internal hydraulic load was applied behaviour observed, focusing especially on presence...
Cooling electronics boxes often requires extraction of high heat fluxes from closed with many heat-producing components. The direct use ventilation is sometimes limited by demands to hermetic units or the need extract a specific place in large and complicated system. A liquid system introduced inside electronic box can be used for this purpose. Unfortunately, metallic exchangers have number shortcomings these applications, including significant weight as well cost space demands. Polymeric...
Metallic heat exchangers have a number of well-known shortcomings such as high weight and cost low resistance to corrosion.Polymeric hollow fiber were proposed about decade ago an alternative for temperature applications.Although experimental results been published liquid-to-liquid applications, there is no data liquid-to-gas applications.To overcome this lack data, two liquid-to-air cross-flow prepared tested.Two types polypropylene fibers (wall thickness 50 μm, outside diameter 800 μm 600...
Polymeric hollow fibre heat exchangers are the new alternative to common metal exchangers. These provide advantages, such as low weight, corrosion resistance, easy shaping and machining. Moreover, they consume less energy during their production. Therefore, environmentally friendly. The paper deals with shell & tube exchangers, which consist of hundreds polymeric fibres. structure transfer surfaces has a significant influence on effectivity use area that is formed by study gives...
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...
Polymeric hollow fibers heat exchangers can be effectively used for flue gas cooling. These are made of hundreds with an outer diameter 1.3 mm and a wall thickness 0.15 mm. Selection material allows to work aggressive gasses condensed liquids without risk corrosion or damage by chemicals. may seem fragile, but they stand up the inner pressure above 100 bar at room temperature have burst 60 80 °C. Their surface is very smooth that positively contributes low fouling its capability...
Polymeric hollow fibre heat exchangers are an alternative to common metal in low-temperature applications. Their advantages low cost, weight, and corrosion resistance. The transfer surface consists of hundreds or even thousands fibres small diameter. There several studies on thermal performance the polymeric exchangers, but pressure drop is also a crucial part design. arrangement, known as bank tubes, for there relations used estimate flow passing tubes. Those based extensive experimental...
Fifteen years ago, polymeric hollow fibre heat exchangers were presented for the first time. Nowadays there are not only shell-and-tube types as at beginning. In this paper, six chaotised bundles with a different number of fibres studied. The varied in their diameter, and shape. These fixed into module such way that middle part serves cross-flow exchanger an air tunnel. They tested air-water application three airflow rates. overall transfer coefficients determined, inner outer derived....
Polymeric hollow fiber heat exchangers are an alternative to common metal in lowtemperature applications.Their advantages low cost, weight, and corrosion resistance.The transfer surface consists of hundreds or even thousands fibers small diameter.The PHFHE for gas-liquid application has a regular structure, which prevents the from blocking allow gas flow through exchanger.This arrangement, known as bank tubes, is multipass shell tube exchangers.There relations used estimate pressure drop...