Tibor Poós

Budapest University of Technology and Economics · Department of Building Service Engineering and Process Engineering

The mixing of granular materials in an agitated drum can be characterized by the dimensionless power equation. The equation was created by dimensional analysis, for which the parameters affecting the mixing power requirement were collected based on the literature. The most important of these are the rotational speed, the drum loading factor, the ge...

The evaporation process is influenced by the properties of gas and liquid. These include the properties of gas, temperature, humidity, characteristic velocity, turbulence intensity of the gas and total pressure of the gas above the liquid surface; and the properties of the liquid, surface temperature, convection and surface area of the liquid. Depe...

A discrete element contact model was developed to simulate the mixing power requirement in an agitated drum. Contact viscous dampings in normal and tangential direction, rolling and twisting resistance torques, including elastic and viscous components have been implemented. The applicability of the developed contact model was first examined by angl...

The heat and mass transfer model using volumetric heat transfer coefficient has been developed for fluidized bed dryers, to be able to determine the moisture content and temperature of the particles, the temperature and the absolute humidity of the drying gas versus drying time, and the temperature and absolute humidity of the drying gas along the...

For fluidized bed drying, the heat and mass transfer process can be modeled by using the volumetric heat transfer coefficient between the drying gas and the particulate matter. Part 1 of this series offered a heat and mass transfer model developed for calculating the particles and drying gas conditions in a fluidized bed dryer. In this part, an alg...

Numerous publications in the literature deal with the investigation of evaporation under forced convection; however, no correlation between the available equations would describe the process and the evaporation rate with high reliability and in a wide range of interpretation. The main parameters influencing the evaporation rate are air temperature,...

The main goal of my work was to design a dry well wastewater pumping station. The products of the pumping station market, the related literature, and the standards were analysed. The collected information was summarized in the catalogue of the requirements. I created the parametric 3D model of the total pumping station. Some of the dimensions are l...

Energy-efficient disposal of hazardous waste by supercritical water oxidation in a continuous tubular reactor. In the process of destruction, most of the exothermic energy generated in the tubular reactor is converted into electricity and sent to the grid. Advantages of the technology: it has a stable tubular reactor, operates without the risk of c...

A batch vacuum rectifier was operated to process further the pyrolysis oil generated as a by-product in the industry. An industrial problem inspired our research topic: a small amount of pyrolysis oil is produced each year, which is not enough for a continuous plant's cost-effective operation. Hence, there is no unified protocol for further separat...

During our research, evaporation of water was investigated at forced convection. After laboratory measurements, it has concluded that in the case of water without heating, the rate of evaporation increases in the function of the air velocity and the temperature of the air. The values of the mass transfer coefficient were determined by one theoretic...

In this study, the opportunity of reducing the DEM simulation time of a laboratory direct shear box test by changing the shear velocity was investigated. Liquid bridges were used to describe the cohesive forces due to moisture between the particles, which are characterized by the fact that the force is not constant as a function of the rupture dist...

The aim of the research was to develop the mathematical background of a DEM contact model taking into account the models in the literature and to implement it in Yade open source DEM software, and finally to validate the model. For this, direct shear box test was used, the laboratory results of which have already been described in our previous stud...

In agriculture, food, chemical, plastic and pharmaceutical industries for designing and operating machines, it is essential to determine the mechanical parameters of the processed granular materials. In most cases, these characteristics are the internal friction angle, the contact cohesion developed by the surface moisture and the apparent cohesion...

The ISCAME 2019 Conference poster of the publication 'Introduction of freeze granulation technology'.

The EuroDrying'2019 Conference poster of the publication 'Mixing placebo tablets in a rotary drum'.

It is common to coat tablets in the pharmaceutical industry. This is usually done in a rotary mixer while the different layers are sprayed onto the surface of the materials. In this research, mixing of placebo tablets was carried out in a rotary drum mixer.. It was found that the surface homogeneity of the bulk could be achieved faster by increasin...

It is common to coat tablets in the pharmaceutical industry. This is usually done in a rotary mixer while the different layers are sprayed onto the surface of the materials. In this research, mixing of placebo tablets was carried out in a rotary drum mixer.. It was found that the surface homogeneity of the bulk could be achieved faster by increasin...

The knowledge of the volumetric heat transfer coefficient is essential for the application of the heat and mass transfer model of fluidized bed drying. From the experimental results a relationship between the dimensionless numbers was created in 𝑁𝑢′=𝑓(𝑅𝑒,𝑃𝑟,𝐴𝑟,𝐿𝑑𝑃) form by using statistical evaluation. The volumetric heat transfer coefficient for a...

The EuroDrying'2019 Conference poster of the publication 'Dimensionless equation for the volumetric heat transfer coefficient in fluidized bed drying'.

The knowledge of the volumetric heat transfer coefficient is essential for the application of the heat and mass transfer model of fluidized bed drying. From the experimental results a relationship between the dimensionless numbers was created in 𝑁𝑢′=𝑓(𝑅𝑒,𝑃𝑟,𝐴𝑟,𝐿/𝑑𝑃) form by using statistical evaluation. The volumetric heat transfer coefficient for...

In our research, the water evaporation was investigated at different air velocities and temperatures. In case of unheated liquid, increasing the air velocity and temperature caused the evaporation rate to increase. The mass transfer coefficient was determined by a theoretical and four empirical correlations. The results obtained in these two ways w...

In our research, the water evaporation was investigated at different air velocities and temperatures. In case of unheated liquid, increasing the air velocity and temperature caused the evaporation rate to increase. The mass transfer coefficient was determined by a theoretical and four empirical correlations. The results obtained in these two ways w...

The aim of the present research is to analyse evaporation intensity induced by natural convection. Simultaneous heat and mass transfer is observed in the case of evaporation from open water tanks as well as during the evaporation of surface moisture when drying materials. Relationships to determine the evaporation rate at natural convection were co...

A fluidizációs szárítóban különböző típusú szemestermékek szárítása végezhető el. A fluidizációs szárításra jellemző hő- és anyagátadást leíró modellbe bemenő paraméterként szükséges megadni a szárítandó anyag főbb tulajdonságait. Laboratóriumi mérésekkel meghatároztuk a vizsgált szemcsés anyagok jellemző méretét, sűrűségét, porozitását és szorpció...

Kutatásunkban egy félüzemi keverős dobszárítóban zajló keverési folyamatot modelleztünk diszkrétele-mes módszer alkalmazásával. A megfelelő kialakítású keverőelem alkalmazása a szárítási hatékonysá-gon túl, meghatározó szerepet tölt be a szemcsés anyagok keverési teljesítményigényében és a keverés minőségében. Munkánk során a keverés eredményeként...

In this research, different types of granules were dried in batch mode in a laboratory scale fluidized bed dryer. The volumetric heat transfer coefficient can be determined from the experimental results for the constant and the falling drying rate period. It is also necessary to specify the main properties of the granules as the input parameter in...

In many industries, mixing of different granular materials occurs while performing drying, coating, homogenization or other processes on the mixed bulk. Thus, depending on the nature of the task, it is essential to select the proper mixing element, as it can change the mixing quality and the operating conditions in the positive or even negative dir...

There are numerous processes in the industry and around the environment where simultaneous heat and mass transfer occurs in the contact surface between gas and liquid. During the research the evaporation process for water was investigated at different air velocities and temperatures. The mass transfer coefficient was determined by a theoretical and...

In the agricultural, food, chemical and pharmaceutical industries, mixing operations of granular materials frequently occur during which fractions are homogenized or the blockage of particles is prevented. In order to select the appropriate agitator motors, it is necessary to know the rotational speed of the mixer and the power requirements of the...

This paper presents the equilibrium desorption isotherms and the isosteric heat of sorption of a mixture containing mechanically dewatered fermentation residue (obtained from a blend of chicken, swine and cattle manure) used in biogas plants and corn spoiled silage in a ratio of 2:1. The moisture desorption isotherms of the fermentation residue wer...

The special active agent content of herbs makes them suitable for healing and health preservation. The key element in the processing of herbs and spices is drying. Before drying, the medicinal plants should be stored under appropriate conditions to avoid deterioration of quality where one of the possible methods is pre-drying with ambient air. This...

In the soil mechanics studies, direct shear box tests are used to determine the macromechanical properties of different soil samples. The internal friction angle resulting from friction between the particles in an aggregate and e.g. the material’s cohesion is created by its moisture content. In the spread of numerical models simulating the behavior...

The measurement results of the evaporation of water and other different liquids from the available literature were collected. According to the published works, the evaporation rate is proportional to the difference of the partial pressure on the liquid’s surface and the partial pressure in the gas in many works. Acetone has many uses specific to el...

There are several technologies in the agricultural, food, chemical and pharmaceutical industries for mixing granular materials. In these processes the homogenization of the particle fractions or the prevention of arch building process play very important roles. To select appropriate mixers' motors installed in certain devices, it is necessary to sp...

Az ipar számos területén szükség van granulátumok gyártására, melynek egyik speciális módszere a fagyasztva granulálás. Ez a művelet magában foglalja a porlasztást, a fagyasztást és a szárítást. Munkánk során ismertetjük az eljárás műveleti lépéseit, valamint összehasonlítjuk azt más granuláló eljárásokkal. Továbbá javaslatot teszünk egy fagyasztva...

Szemcsés anyagok szárítására alkalmas vibro-fluid szárítót széles körben alkalmazzák a mező-gazdaság, a vegyipar és az élelmiszeripar területén egyaránt. A készülékben egy vízszintes elrendezésű perforált tartólemezen egy sűrű szövésű háló helyezkedik el. Az erre érkező szárítandó anyag a rács-szöveten átáramló szárítógáz és a tartólemez vibrációjá...

A mezőgazdaságban, az élelmiszer-, a vegy- és a gyógyszeriparban gyakran előfordul szemcsés anyagok keverése. Az adott berendezésbe beépített keverőmotorok kiválasztásához a keverőelem for-dulatszámának és a hajtómotor teljesítményszükségletének meghatározása szükséges. Kutatásunk fő célja egy keverős dobszárító keverési teljesítményszükségletének...

There are several technologies in the agricultural, food, chemical and pharmaceutical industries for mixing granular materials. In these processes the homogenization of the particle fractions or the prevention of arch building process plays the very important roles. To select appropriate mixers' motors installed in certain devices, it is necessary...

In the agricultural, food, chemical and pharmaceutical industries , the mixing of granular materials often occurs. To select the mixing motors installed in the equipment, the speed of the mixer and the performance for the propulsion engine are required. The main purpose of this research was to create a discrete element simulation model capable of d...

The aim of the simultaneous heat and mass transfer research is to analyze evaporation intensity induced by heat convection. Phenomena of simultaneous heat and mass transfer can be observed in the case of evaporation from open water tanks as well as during the evaporation of surface moisture when drying materials. Relationships for determining the e...

The aim of the simultaneous heat and mass transfer research is to analyze evaporation intensity induced by heat convection. Phenomena of simultaneous heat and mass transfer can be observed in the case of evaporation from open water tanks as well as during the evaporation of surface moisture when drying materials. Relationships for determining the e...

Vibrating fluid-bed dryer is widely used for drying granular material in chemical, agricultural, and pharmaceutical industries. The equipment contains a horizontal positioned perforated support plate with a metal grid. The dried material located on the grid forms into fluidized state in the effect of the drying gas, which flows through the grid and...

A screw conveyor heat treatment machine was designed to treat agricultural granular materials. A thermodynamic model was created to describe heat transfer with continuous material flow. The cases of shell side steam heating, steam injection, shell side water cooling and cooling by air injection were examined. In the calculation algorithm based on t...

In the literature there are several Nu=f(Re) equations to determine the heat transfer coefficient between solids and the drying gas, but these equations differ significantly because of the inaccuracy of determining the contact surface between the two phases. A pilot plant fluidized bed dryer is developed to study the heat and mass transfer phenomen...

Granulation is a widely used process in diverse sectors of the industry, one of them is freeze granulation. Besides pharmaceutical applications (eg. vitamins, vaccines, inhalers), this technology is often used in the chemical industry (eg. environmentally friendly batteries), the ceramic industry (powder sintering) and the food industry (eg. coffee...

The role of medicinal plants in therapy is changed in different ages, closely linked to the state of the level of the therapy. Their special active agent content makes herbs suitable for healing and health preservation. The moisture content of harvested plants is generally very high, around 60-80%. If the moisture content is not significantly reduc...

In this study the measurements of direct shear box test were done on the assembly of hulled millet where different moisture contents were set. The moisture content dependent internal friction angle and cohesion of the aggregation were determined. With the use of a discrete element software the model of the direct shear box test was improved and sim...

Granulation is a widely used process in diverse sectors of the industry, one of them is freeze granulation. Besides pharmaceutical applications (eg. vitamins, vaccines, inhalers), this technology is often used in the chemical industry (eg. environmentally friendly batteries), the ceramic industry (powder sintering) and the food industry (eg. coffee...

In this study the angle of repose of hulled millet with different moisture content was investigated with measurement and discrete element method. The result of the simulation and measurement were compared. The aim of this study to define the unknown micromechanical parameter set of the discrete element model. In further studies the calibrated param...

The special active agent content makes suitable herbals for healing and health preservation. The key element in herbs and spices processing is drying. The required low moisture content of medicinal plants to storage can be achieved only by applying drying equipment at Hungarian climatic conditions. The extent of the dryer capacity deÞ nes the proce...

Fluidized bed dryers are widely used in several fi elds of industry. Suffi ciently accurate thermal models provide an opportunity to increase the effectiveness of dryers. The required size of a fl uidized bed dryer can be defi ned with the application of mathematical model. This work is aimed at developing mathematical model to investigate the infl...

A kutatás során különböző nedvességtartalmú hántolt köles rézsűszögeit vizsgáltuk méréssel és diszkrét elemes modellezéssel, majd a kapott eredmények összehasonlításra kerültek. Fő célunk az ismeretlen szimulációs mikromechanikai paraméterek meghatározása volt, mivel azok további kutatás során felhasználásra fognak kerülni a választott szemcsés any...

Különböző halmazállapotú anyagok, elegyek keverése gyakran előfordul a vegyiparban, a gyógyszeriparban, az élelmiszeriparban és a mezőgazdaságban. A keverős dobszárítóban szemcsés anyagok szárítása történik, mégpedig folyamatos keverés mellett, amelynek célja szabad szemcsefelület létrehozása annak érdekében, hogy a szárítás sebessége minél gyorsab...

During absorption three processes take place: absorption, where in the contact surface between gas and liquid certain components from the gas are absorbed in the liquid for extraction or removal; heat transfer, where because of the temperature based driving forces the temperature of gas is getting lower and the temperature of liquid is getting high...

Az anyagok szárítása során a szárítógáz és a szárítandó anyag között egyidejű hő-és anyagátadás történik. A felületi nedvesség elpárolgása után az anyag belsejéből intenzívvé válik a nedvesség eltávozása, majd miután az anyag és a szárítógáz nedvességtartalma egyensúlyba kerül, adott állapotjelzők mellett az anyagot már nem lehet tovább szárítani....

Az ipar számos területén alkalmaznak fluidizációs szárító berendezéseket szemcsés anyagok ned-vességtartalmának csökkentésére. Megfelelő matematikai modellek alkalmazásával lehetőség van nö-velni a szárítók hatásosságát. A műveletet leíró differenciálegyenletek bemenő paramétereinek definiá-lását követően a szárító szükséges hossza, illetve a szemc...

The special active agent content makes suitable herbals for healing and health preservation. A significant number of medicinal plants are pharmaceutical raw materials, which from the active agent can be extracted by various procedures. The moisture content of harvested plants is generally very high, around 60-80%. If the moisture content is not sig...

During absorption the gas mixture is contacted with the liquid in order to transport one or more components from the gas to the liquid. In the absorber three processes take place: absorption, where in the contact surface between gas and liquid certain components from the gas are absorbed in the liquid for extraction or removal; heat transfer, where...

Besides building services employments and swimming pools there are many industrial facilities with free surface water reservoir for different technological purposes. On the free surface heat transfer and diffusion occur, whereby the vapour diffuses into the ambient air. Therefore, the water loss should be replaced. There are many empirical correlat...

Fluidized bed dryers are often used in several industrial processes to dry wet granular solids with high moisture contents. During the drying process, simultaneous heat- and mass transfer occurs between the material and drying gas. Drying is an extremely energy intensive process, therefore the invested energy should be mitigated during planning the...

This corrigendum serves the purpose of resolving any misunderstandings and shortcomings regarding the above paper. The term ‘free water surface’ used in the paper may be a subject of misunderstanding. By the authors in the case of a ‘free water surface’ the ratio of gas flow and evaporation rates is large enough that during evaporation the state of...

A method and an experimental setup are developed for determining the intensity of evaporation from the free surface of water. During the measurement, the ambient air velocity and the water temperature can be varied. The mass and temperature of water, as well as the temperature, pressure, and humidity of the ambient air are measured as functions of...

One of the first steps of processing herbs and spices is drying. Due to the climatic conditions of Hungary, the desired humidity level where te preservation of plants is viable, can only be achieved with drying machinery. The drying capacity of the factory determines the processing capacity of the factory. Due to everyday operation, it may occur th...

Fluidized bed dryers are widely used in the chemical-, pharmaceutical industry, and agriculture. To scaling up, sufficiently accurate thermal models provide an opportunity to increase the effectiveness of dryers. Applying the mathematical model, the required size of a fluidized bed dryer can be defined. The work is aimed at developing mathematical...

The key element in herbs and spices processing is drying. The required low moisture content of medicinal plants to storage can be achieved only by applying drying equipment at Hungarian climatic conditions. The extent of the dryer capacity defines the processing capacity of the factory. During the daily operation can easily occur bottleneck, when l...

Besides building services employments and swimming pools there are many industrial facilities with free surface water reservoir for different technological purposes. On the free surface heat transfer and diffusion occur, whereby the vapour diffuses into the ambient air. Therefore, the water loss should be replaced. There are many empirical correlat...

The special active agent content makes suitable herbals for healing and health preservation. The key element in herbs and spices processing is drying. The required low moisture content of medicinal plants to storage can be achieved only by applying drying equipment at Hungarian climatic conditions. The aim of the manuscript is to determinate operat...

Az épületgépészeti alkalmazások, fürdőmedencék mellett, számos ipari létesítményben találhatóak nyílt felszínű folyadéktározók, melyeket különböző technológiai célokra alkalmaznak. A szabad vízfelszínen hő- és anyagátadás történik, mely során a vízgőz a környezeti levegőbe diffundál, emiatt az elpárologtatott vizet pótolni kell. A párolgással eltáv...

Az ipar számos területén alkalmaznak fluidizációs szárító berendezéseket szemcsés anyagok nedvességtartalmának csökkentése érdekében. A szárítás művelete során egyidejű hő-és anyagátadás jön létre a szemcsék és a szárítógáz között. A szárítás egy meglehetősen energiaigényes művelet, ezért törekedni kell a befektetett energia csökkentésére. Munkánk...

There are many industrial facilities with free surface water reservoir for different technological purposes. On the free surface heat transfer and diffusion occur, whereby the vapor diffuses into the ambient air. Therefore, the water loss should be replaced. There are many empirical correlations for calculating the quantity of the evaporated water...

Szemcsés anyagok fluidizációs szárítási folyamatainak vizsgálatára alkalmas matematikai mo-dellek bemenő paramétereit képezik a hőátadási tényező függvények. A hőátadási tényező meghatáro-zásánál nagy bizonytalanságot jelent a hőátadó felület számszerűsítése. Így a szabálytalan szemcsegeo-metria és a szemcsék állandó mozgása miatt a térfogati hőáta...

The input parameters of mathematical models are the heat transfer coefficient functions to describe the process of fluidized bed drying. Determining the contact surface of particles includes a number of uncertainties. The purpose of our work is to apply the volumetric heat transfer coefficient to create the criterial equations. During our work the...

There are many industrial facilities with free surface water reservoir for different technological purposes. On the free surface heat transfer and diffusion occur, whereby the vapor diffuses into the ambient air. Therefore, the water loss should be replaced. There are many empirical correlations for calculating the quantity of the evaporated water...

There are many industrial facilities with free surface water reservoir for different technological purposes. On the free surface heat transfer and diffusion occur, whereby the vapor diffuses into the ambient air, therefore the water loss should be replaced. There are many empirical correlations for calculating the quantity of the evaporated water....

For the scale up model of the fluidized bed dryer the heat transfer coefficient between the surface of material and the drying gas is needed. To determine the heat transfer coefficient, the heat transfer surface of the material should be exactly known. This includes a number of uncertainties due the irregular surface of the particles and the size s...

In industrial drying processes heat is usually transferred from air or flue gas to the wet material, and moisture diffuses to the drying gas simultaneously. Transfer coefficients between drying gas and material are needed to be known in order to scale up drying processes. These physical properties are generally determined by measurements. The liter...

Fluidized bed dryer are widely used in the food and chemical industry to dry wet particles fast and effective. A pilot plant fluidized bed dryer was developed to study the heat-and mass transfer phenomenon during the drying process. Volumetric heat transfer coefficient is applied for modelling the fluidized bed dryers. Modified Nusselt-number is de...

The EuroDrying'2015 Conference poster of the publication 'Equations of volumetric heat transfer coefficients and mathematical models at rotary drum dryers'.

The EuroDrying'2019 Conference poster of the publication 'Volumetric heat transfer coefficient for modelling the fluidized bed dryers'.

In industrial drying processes heat is usually transferred from air or flue gas to the wet material, and moisture diffuses to the drying gas simultaneously. Transfer coefficients between drying gas and material are needed to be known in order to scale up drying processes. These physical properties are generally determined by measurements. The liter...

Fluidized bed dryer are widely used in the food and chemical industry to dry wet particles fast and effective. A pilot plant fluidized bed dryer was developed to study the heat- and mass transfer phenomenon during the drying process. Volumetric heat transfer coefficient is applied for modelling the fluidized bed dryers. Modified Nusselt–number is d...

In industrial drying processes heat is usually transferred from air or flue gas to the wet material, and moisture diffuses to the drying gas simultaneously. Transfer coefficients between drying gas and material are needed to be known in order to scale up drying processes. These physical properties are generally determined by measurements. The liter...

Egy kereskedelmi forgalomban lévő kerámia alapú hőszigetelő anyag hővezetési tényezőjét hatá-roztuk meg az ún. „hot plate” eljárással. A gyártó ajánlása szerint a szigetelő anyag 0,001-0,003 W/(mK) hővezetési tényezővel rendelkezik. Munkánk célja, hogy ellenőrizzük a szakmai ismertetőben közölt hővezetési tényező értékét. (A measuring method was pe...

A pilot plant fluidized bed dryer was developed, which is suitable to dry particles fast and effective. The instrumentation of equipment ensures the measurement of the parameters of drying gas, and the surface temperature of the particles. We performed experiments on batch mode, thereby the simultaneous heat-and mass transfer can be examined during...

There are many industrial facilities with free surface water reservoir for different technological purposes. On the free surface heat transfer and diffusion occurs, whereby the vapor diffuses into the ambient air, therefore the water loss should be replaced. There are many empirical correlations to calculate the quantity of the evaporated water. Th...

This study presents experiences of drying waste sludge in an agitated drum dryer. Measurements were performed on an agitated drum dryer apparatus equipped with up-to-date instrumentation. As waste sludge is prone to adhesion and balling, it is important to identify the conditions appropriate for drying. Different cases were examined: during measure...

Szemcsés anyagok gyors és hatékony szárítására laboratóriumi fluidizációs szárítót fej-lesztettünk ki. A készüléken elhelyezett műszerek segítségével mérhetők a szárítógáz paraméterei és az anyag felületi hőmérséklete, ezáltal vizsgálható a fluidizációs szárításkor bekövetkező szi-multán hő- és anyagátadás. A szárítón végzett mérések során mértük a...

There are many industrial facilities with free surface water reservoir for different technological purposes. On the free surface heat transfer and diffusion occur, whereby the vapor diffuses into the ambient air. Therefore the water loss should be replaced. There are many empirical correlations for calculating the quantity of the evaporated water w...

This study presents experiences of drying waste sludge in an agitated drum dryer. Measurements were performed on an agitated drum dryer apparatus equipped with up-to-date instrumentation. As waste sludge is prone to adhesion and balling, it is important to identify the conditions appropriate for drying. Different cases were examined; during measure...

A new dryer construction has been developed for drying biomass basic materials for energy purposes (straw, sawdust, and other light granular materials). As a result of its simple design, the machine is perfectly suitable for reducing moisture by heat transfer. Compared to the machine types applied thus far, this new construction provides a better r...

Számos ipari létesítményben találhatóak nyílt felszínű víztározók, melyeket különböző technológiai célokra alkalmaznak. A szabad vízfelszínen hő- és anyagátadás történik, mely során a vízgőz a környezeti levegőbe diffundál, emiatt az elpárolgott vizet pótolni kell. Ez a téma újabban azért került az érdeklődés középpontjába, mert az épületek hűtése...

Agitating drum dryers are often used to dry granular solids with high moisture contents. Moisture reduction and thermal treatment can be enhanced by a contact heating jacket or heated agitators. A mathematical model was created to investigate the influence of operating parameters for the description of simultaneous heat and mass transfer in a dryer...

A dryer was constructed for moisture reduction of wet straw, sawdust and granulated material. Moisture reduction and thermal treatment can be done in this spin dryer, where convective heat transfer is helped by contact hot jacket. The dryer, named TOGIAS is under patent protection.