Wyniki wyszukiwania dla: INTENSIFICATION OF HEAT EXCHANGE

• Heat transfer intensification by enlarged surface roughness in the plate heat exchanger

  Publikacja

  • J. Wajs
  • D. Mikielewicz

  - Rok 2013

  In the paper an experimental analysis of passive heat transfer intensification technique employed in the case of the plate heat exchanger is presented. The passive intensification was obtained by a modification of the heat transfer surface. The roughness of surface was increased by a use of glass micro-beads. Single-phase convective heat transfer in the water-water system was studied. The experiment was accomplished in two stages....

• Microjet technology as a perspective intensification method for high performance heat exchangers

  Publikacja

  • D. Mikielewicz
  • J. Wajs
  • M. Bajor

  - Rok 2015

  In the paper two oryginal designs of compact heat exchangers with intensification effect produced by microjets are presented. The technology of microjets manufacturing is an "inhouse" patented design. The idea of such heat exchanger is shown together with the flow and thermal characteristics of the prototypes. The results of performer measurements are satisfactory and encourage for further research of the original designs.

• Experimental study of heat transfer intensification in surface cooling using microjets

  Publikacja

  • D. Mikielewicz
  • J. Mikielewicz
  • T. Muszyński
  • E. Ihnatowicz

  - Rok 2010

  W pracy przedstawiono badania eksperymentalne intensyfikacji wymiany ciepła podczas chłodzenia powierzchni mikrostrugami. Wyniki badań porównano z własnym modelem teoretycznym zjawiska.

• Heat transfer intensification by jet impingement – numerical analysis using RANS approach

  Publikacja

  • T. Kura
  • E. Fornalik-Wajs
  • J. Wajs
  • S. Kenjeres

  - E3S Web of Conferences - Rok 2019

  Jet impingement is a method of the heat transfer enhancement applied in the engineering systems. The idea is to generate fast-flow fluid jet which impinge on the heated (or cooled) surface, causing significantly higher heat transfer rate. Although some flat surface jet impingement cases are described in the literature, the validated data is still limited. The reason is coming from the fact, that these flows are hydrodynamically...

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• Heat and mass exchange in the process of condensation on critical droplets.

  Publikacja

  • R. Puzyrewski

  - Inżynieria i Aparatura Chemiczna - Rok 2003

  Sformułowano model wzrostu kropli krytycznej podając równania zmiany masy i temperatury kropli. Pokazano formę zlinearyzowaną tych równań dobrze aproksymującą wzrost kropli w poblizu wymiaru krytycznego. Podano rozwiązanie układu zlinearyzowanego uzależniając zmianę temperatury od zmiany masy kropli i czasu charakterystycznego.

• Heat exchange enhancement of jet impingement cooling with the novel humped-cone heat sink

  Publikacja

  • M. Froissart
  • P. Ziółkowski
  • W. Dudda
  • J. Badur

  - Case Studies in Thermal Engineering - Rok 2021

  Jet impingement cooling technology is applicable to control temperature of devices, where very high heat flux is generated within a small area. This paper is about the improvement of the jet impingement cooling efficiency by the heat sink geometry modification. Two reference cases were sourced from the literature – flat heat sink and modified one with cone in the jet stagnation region. Such a change improves cooling capability...

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• Intensyfikacja wymiany ciepła przy pomocy mikrostrug = Heat transfer intensification using microjets.

  Publikacja

  • T. Muszyński

  - Rok 2010

  W pracy przedstawiono wyniki badań eksperymentalnych nad intensyfikacją strumienia ciepła przy pomocy pojedynczej mikrostrugi wody. W pracy przedstawiono wyniki badań dla dysz o średnicy 180 i 280 mikrometrów.

• Recent advances of selected passive heat transfer intensification methods for phase change material-based latent heat energy storage units: A review

  Publikacja

  • M. Rogowski
  • R. Andrzejczyk

  - INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER - Rok 2023

  The following article overviews recent studies regarding heat transfer enhancement methods, explicitly focusing on fins and coils utilization, in phase change material-based latent heat thermal energy storage systems. It discusses the influence of various geometrical and material parameters on the melting and solidification processes, as well as the orientation of the heat transfer surface within the storage tank. Additionally,...

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• Numerical solution analysis of fractional point kinetics and heat exchange in nuclear reactor

  Publikacja

  • T. Nowak
  • K. Duzinkiewicz
  • R. Piotrowski

  - NUCLEAR ENGINEERING AND DESIGN - Rok 2015

  The paper presents the neutron point kinetics and heat exchange models for the nuclear reactor. The models consist of a nonlinear system of fractional ordinary differential and algebraic equations. Two numerical algorithms are used to solve them. The first algorithm is application of discrete Grünwald-Letnikov definition of the fractional derivative in the model. The second involves building an analog scheme in the FOMCON Toolbox...

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• ORF Approximation in Numerical Analysis of Fractional Point Kinetics and Heat Exchange Model of Nuclear Reactor

  Publikacja

  • T. Nowak
  • K. Duzinkiewicz
  • R. Piotrowski

  - Rok 2014

  This paper presents results concerning numerical solutions of the fractional point kinetics (FPK) and heat exchange (HE) model for a nuclear reactor. The model consists of a nonlinear system of fractional and ordinary differential equations. Two methods to solve the model are compared. The first one applies Oustaloup Recursive Filter (ORF) and the second one applies Refined Oustaloup Recursive Filter (RORF). Simulation tests have...

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• ORF Approximation in Numerical Analysis of Fractional Point Kinetics and Heat Exchange Model of Nuclear Reactor

  Publikacja

  • T. Nowak
  • K. Duzinkiewicz
  • R. Piotrowski

  - Rok 2014

  This paper presents results concerning numerical solutions of the fractional point kinetics (FPK) and heat exchange (HE) model for a nuclear reactor. The model consists of a nonlinear system of fractional and ordinary differential equations. Two methods to solve the model are compared. The first one applies Oustaloup Recursive Filter (ORF) and the second one applies Refined Oustaloup Recursive Filter (RORF). Simulation tests have...

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• Towards enhanced heat and mass exchange in adsorption systems: The role of AutoML and fluidized bed innovations

  Publikacja

  • J. Krzywanski
  • D. Skrobek
  • M. Sosnowski
  • W. Ashraf
  • K. Grabowska
  • A. Zylka
  • A. Kulakowska
  • W. Nowak
  • K. Sztekler
  • M. Shahzad

  - INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER - Rok 2024

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• Organic Rankine cycle turbogenerator cooling – Optimization of the generator water jacket heat exchange surface

  Publikacja

  • D. Zaniewski
  • P. Klimaszewski
  • P. Klonowicz
  • Ł. Witanowski
  • P. Lampart
  • Ł. Jędrzejewski
  • T. Suchocki

  - Applied Thermal Engineering - Rok 2023

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• Comparative Study on Effects of Thermal Gradient Direction on Heat Exchange between a Pure Fluid and a Nanofluid: Employing Finite Volume Method

  Publikacja

  • A. Koulali

  - Coatings - Rok 2021

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• Dariusz Mikielewicz prof. dr hab. inż.

  Osoby

  Zakład Systemów i Urządzeń Energetyki Cieplnej, Politechnika Gdańska, Wydział Inżynierii Mechanicznej i Okrętownictwa, Instytut Energii

  Dariusz Mikielewicz – urodził się 6 lutego 1967 roku w Gdańsku, w 1985r. zdał pomyślnie egzaminy wstępne na Wydział Budowy Maszyn Politechniki Gdańskiej, który ukończył z wynikiem bardzo dobrym w 1990 roku na specjalności Maszyny i Urządzenia Energetyczne. Zainteresowania pracą naukową skłoniły go do podjęcia badań na University of Manchester na wydziale mechanicznym i energetyki jądrowej (Mechanical and Nuclear Engineering Department)...

• A new construction of shell-and-tube heat exchanger with impinging jets and minichannels technologies for heat recovery from gases – experimental analysis

  Publikacja

  • J. Wajs
  • R. Michałka
  • A. Gołąbek
  • T. Kura

  - Rok 2020

  A dynamic development of technologies allowing waste heat utilization is observed in a correspondence with a pro-ecological approach of the zero waste idea. Such approach becomes the most demanding in the area of low-temperature was heat sources, especially gaseous media. Till now, they were usually not utilized due to unfavorable thermal conditions and high costs. Therefore, the zero waste approach directs research on techniques...

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• Thermal-Hydraulic Studies on the Shell-and-Tube Heat Exchanger with Minijets

  Publikacja

  • J. Wajs
  • M. Bajor
  • D. Mikielewicz

  - ENERGIES - Rok 2019

  In this paper a patented design of a heat exchanger with minijets, with a cylindrical construction is presented. It is followed by the results of its systematic experimental investigations in the single-phase convection heat transfer mode. Based on these results, validation of selected correlations (coming from the literature) describing the Nusselt number was carried out. An assessment of the heat exchange intensification level...

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• Applicability of arrays of microjets heat transfer correlations to design compact heat exchangers

  Publikacja

  • T. Muszyński
  • R. Andrzejczyk

  - APPLIED THERMAL ENGINEERING - Rok 2016

  The article presents experimental studies on a compact heat exchanger with heat transfer intensification by means of impinging microjets. The pursuit to provide high performance of heat exchangers is a response to the demand both in economics and in the universal tendency to miniaturization of industrial equipment. This paper presents the design and tests of a prototype, microjet heat exchanger. The modular design of the heat exchanger...

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• Thermodynamic and geometrical characteristics of mixed convection heat transfer in the shell and coil tube heat exchanger with baffles

  Publikacja

  • R. Andrzejczyk
  • T. Muszyński

  - APPLIED THERMAL ENGINEERING - Rok 2017

  The article presents passive heat transfer enhancement method in the form of baffles to increase the energy efficiency of the shell coil heat exchanger. Conducted literature review shows that, despite numer- ous studies, there is little work on the intensification of heat transfer at the shell side. Most of the work focuses on the impact of geometrical parameters of the coil itself. This article successfully proves that it is possible...

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• Bartosz Dawidowicz dr inż.

  Osoby

  Instytut Energii

  Absolwent Wydziału Budowy Maszyn Politechniki Gdańskiej Mgr inż. - Wydział Budowy Maszyn Politechniki Gdańskiej: specjalizacja: Maszyny i Urządzenia Przemysłu Spożywczego (2000)Dr - Wydział Budowy Maszyn Politechniki Gdańskiej, dyscyplina: budowa i eksploatacja maszyn, specjalność: wymiana ciepła (2008) Zainteresowania naukowe dotyczą m.in. technik wodorowych – ogniwa paliwowe, wykorzystanie wodoru na cele energetyczne, odnawialnych...

• Flow distribution and heat transfer in minigap and minichannel heat exchangers during flow boiling

  Publikacja

  • M. Klugmann
  • P. Dąbrowski
  • D. Mikielewicz

  - APPLIED THERMAL ENGINEERING - Rok 2020

  The topic of boiling heat transfer in miniscale geometries has focused the ever increasing interest of researchers in recent years. However, most of the works are related to mini- and microchannels and much less to minigaps. Meanwhile, minigaps allow for more comprehensive experimental studies, i.e. flow visualisations due to the flat, two-dimensional configuration of the flow. The results of the experimental investigations of...

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• CHARAKTERYSTYKA WYMIANY CIEPŁA I OPORÓW PRZEPŁYWU OMYWANIA MIKROSTRUGAMI ROZWINIĘTEJ POWIERZCHNI

  Publikacja

  • T. Muszyński
  • R. Andrzejczyk

  - Rok 2017

  W artykule przedstawiono eksperymentalne badania kompaktowego wymiennika ciepła z intensyfikacją przejmowania ciepła przy użyciu mikrostrug. Niniejszy artykuł przedstawia projekt i testy prototypu, wymiennika ciepła typu mikrostrugowego. Modułowa konstrukcja wymiennika umożliwia zmianę wymiarów geometrycznych, a także zmianę materiału przegrody wymiennika ciepła. Metoda graficzna Wilsona została z zastosowana w celu określenia...

• INTENSYFIKACJA WYMIANY CIEPŁA W WYMIENNIKU WĘŻOWNICOWYM Z WYKORZYSTANIEM PRZEGRÓD O RÓŻNEJ GEOMETRII

  Publikacja

  • R. Andrzejczyk
  • T. Muszyński

  - Rok 2017

  W pracy zaprezentowano możliwości wykorzystania pasywnej intensyfikacji wymiany ciepła w postaci przegród dla podniesienia efektywności energetycznej wymiennika wężownicowego. Badania zostały przeprowadzone z wykorzystaniem modułowego wymiennika z wężownicą w postaci grzałki elektrycznej. Medium odbierającym ciepło była woda o stałych parametrach cieplnoprzepływowych na wlocie do modułu. Pomiary przeprowadzono dla szerokiego zakresu...

• Selected aspects of two-phase flow studies using different visualization techniques in minichannels

  Publikacja

  • M. Klugmann
  • D. Mikielewicz

  - Rok 2016

  The subject of the study is to present the possibility of the use of visualization techniques in the researches on two-phase flows, carried out by the authors for many years. These works included as follows: heat transfer during the flow boiling, boiling crises and condensation in flow. The issue of the heat transfer intensification during the flow boiling through the channels of small diameters was analyzed. All this work focused...

• Assessment of the impact of jet impingement technique on the energy efficiency of air-cooled BIPV/T roof tile

  Publikacja

  • J. Wajs
  • J. Łukasik

  - Archives of Thermodynamics - Rok 2024

  The paper concerns a numerical analysis of cooling of the hybrid photovoltaic (PV) modules dedicated to Building-Integrated Photovoltaic/Thermal (BIPV/T) systems. Attention was focused on the photovoltaic roof tiles, using a jet impingement technique, in which the intensification of heat transfer is ensured by streams of air hitting the heat exchange partition. A series of numerical simulations were carried out to assess an influence...

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• Ewa Klugmann-Radziemska prof. dr hab.

  Osoby

  Szkoła Doktorska Wdrożeniowa, Katedra Konwersji i Magazynowania Energii

  Ewa Klugmann-Radziemska ukończyła studia wyższe na kierunku fizyka na Uniwersytecie Gdańskim. Od roku 1996 związana jest z Politechniką Gdańską, kiedy to rozpoczęła studia doktoranckie. Obecnie jest profesorem na Wydziale Chemicznym Politechniki Gdańskiej, od roku 2006 kierownikiem Katedry Konwersji i Magazynowania Energii. W latach 2008–2016 pełniła funkcję Prodziekana ds. współpracy i rozwoju, w latach 2016-2019 była Pełnomocnikiem...

• Janusz Cieśliński prof. dr hab. inż.

  Osoby

  Instytut Energii

  Urodził się 15 kwietnia 1954 r. w Słupsku. Jest absolwentem Wydziału Budowy Maszyn Politechniki Gdańskiej (1978), z którą związał całe swoje życie zawodowe. W 1986 r. obronił doktorat, w 1997 r. – habilitację, w 2006 r. – uzyskał tytuł profesora. Pełnił funkcje prodziekana ds. nauki Wydziału Mechanicznego przez dwie kadencje (2002–2008) oraz kierownika: Katedry Maszyn Przemysłu Spożywczego (2002–2006), Katedry Ekoinżynierii i...

• Fundamentals of thermodynamics and heat transfer, W/C, GTM (WCh), sem.04, zimowy 23/24 (PG_00048767)

  Kursy Online

  • T. Muszyński

  Table of contents presented on the course: Basic terms.The first law of thermodynamics for closed and open systems.The properties of perfect, semi-perfect and real gases.Gas rights. Thermal and caloric state equation.Thermodynamic transformations of a perfect gas.Gaseous thermodynamic cycles. The second law of thermodynamics.Steam and steam cycles.Basics of heat exchange.

• Possible directions for development of C-ITS services in cities on the example of the TRISTAR System

  Publikacja

  • J. Oskarbski
  • M. Zawisza
  • K. Żarski
  • K. Jamroz

  - Archives of Transport System Telematics - Rok 2018

  During the previous EU financial perspective (2007 - 2013), we observed an intensification of the evelopment of transport management systems using ITS services in Polish cities. One of the biggest territorially and functionally system is Tri-city TRISTAR system, the implementation of which was completed in 2015. The concept of the TRISTAR system and its architecture was developed in the years 2002-2007. Currently, we can observe...

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• Visualization of the surface of the Nafion membrane

  Dane Badawcze

  open access

  • A. Zieliński
  • J. Ryl

  - seria: Scanning Probe Microscopies data

  Fuel cells use the chemical energy of hydrogen or other fuels to produce electricity. If the fuel is hydrogen, the only products are electricity, water and heat. Fuel cells are unique in the variety of their potential applications, they can use a wide variety of fuels. They are also highly scalable devices that can power both cars and mobile phones....

• Wieloobszarowa rozmyta regulacja PID mocy reaktora jądrowego

  Publikacja

  • B. Puchalski
  • T. A. Rutkowski
  • K. Duzinkiewicz

  - Measurement Automation Monitoring - Rok 2013

  W artykule przedstawiono wieloobszarowy regulator rozmyty z lokalnymi regulatorami PID dla sterowania mocą reaktora jądrowego typu PWR. Wykorzystano model matematyczny o parametrach skupionych reaktora PWR obejmujący procesy generacji i wymiany ciepła oraz efektów reaktywnościowych. Nastawy lokalnych regulatorów PID zostały dobrane w sposób optymalny, minimalizując całkowy wskaźnik jakości ISE. Na przykładzie pokazano że zastosowane...

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• Partition of friction heat between sliding semispaces due to adhesion-deformational heat generation

  Publikacja

  • O. Nosko

  - INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Rok 2013

  Analytical expressions of heat-partition coefficient and contact temperatures for two sliding semispaces with account for adhesion-deformational heat generation and contact heat exchange have been obtained. The rate of deformational heat generation is assumed to decay exponentially with increase of distance from the interface. It has been shown that heat-generation configuration and the intensity of contact heat exchange have impact...

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• Anthropopressure’s intensification with reference to Arctic ecosystems

  Publikacja

  • K. Kozak
  • M. Szopińska
  • A. Pacyna-Kuchta
  • K. Kozioł
  • S. Lehmann-Konera
  • Ż. Polkowska

  - Rok 2014

  This paper concerns issue of long range atmospheric transport of pollutants to polar areas and intensification of their toxic effect on biota in the face of climate change. Arctic which was for years seen as a pristine and not affected by antropopressure region became a sink of xenobiotics. Atmospheric circulation facilitates transport of chemicals from Eurasia to Arctic. Influence of climate change on crucial balance of polar...

• Flow boiling intensification in minichannels by means of mechanical flow turbulising inserts

  Publikacja

  • D. Mikielewicz
  • M. Klugmann
  • J. Wajs

  - INTERNATIONAL JOURNAL OF THERMAL SCIENCES - Rok 2013

  The work presents the results of experimental investigation on heat transfer in minichannels. Refrigerant R123 was used as a test fluid. Single vertical silver tubes of 380 mm length and 2.3 mm diameter were examined with two variants of turbulising inserts. A wide range of parameters was considered, namely mass flux G=534-3011 kg/(m2s), heat flux qw=28.5-68.4 kW/m2, saturation temperature Tsat=23-86 stC and the full range of vapour...

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• Concrete temperature measurements of cubic specimens cured under isothermal and semi-adiabatic conditions

  Dane Badawcze

  embargo

  • A. Kuryłowicz-Cudowska

  The DataSet contains temperature measurements of concrete cubes (150 x 150 x 150 mm) cured under isothermal and semi-adiabatic conditions. The specimens were moulded from six types of concrete mixtures produced in the laboratory conditions. Mix #1: Portland cement CEM I 42.5R and gravel aggregate, mix #2: CEM I 42.5R and  basalt aggregate, mix#3: Portland-composite...

• Exchange

  Czasopisma

  ISSN: 0166-2740 , eISSN: 1572-543X

• Exchange-traded products in Germany: development and substitution of exchange-traded funds, exchange-traded commodities and exchange-traded notes.

  Publikacja

  • A. Marszk

  - EQUILIBRIUM Quarterly Journal of Economics and Economic Policy - Rok 2018

  Research background: Exchange-traded products (ETPs) are one of the most rapidly growing categories of financial products. Their fast development has been boosted by innovative features. Three main categories of ETPs are exchange-traded funds (ETFs), exchange-traded commodities (ETCs) and exchange-traded notes (ETNs). ETCs and ETNs remain least known, even though their number on some stock exchanges is high. In Europe, Germany...

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• Heat transfer and pressure drop characteristics of the silicone-based plate heat exchanger

  Publikacja

  • T. Muszyński
  • R. Andrzejczyk
  • I. Wong Park
  • C. A. Dorao

  - Archives of Thermodynamics - Rok 2019

  The paper presents an experimental investigation of a silicone based heat exchanger, with passive heat transfer intensification by means of surface enhancement. The main objective of this paper was to experimentally investigate the performance of a heat exchanger module with the enhanced surface. Heat transfer in the test section has been examined and described with precise measurements of thermal and flow conditions. Reported...

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• High Performance Tubular Heat Exchanger with Minijet Heat Transfer Enhancement

  Publikacja

  • J. Wajs
  • D. Mikielewicz
  • E. Fornalik-Wajs
  • M. Bajor

  - HEAT TRANSFER ENGINEERING - Rok 2019

  In the paper, the original cylindrical heat exchanger with minijets (MJHE) was introduced. The systematic experimental analysis of the prototype heat exchanger was described with special attention paid to such parameters as the heat transfer effectiveness, heat transfer rates, overall heat transfer coefficients, and pressure drop. The heat transfer coefficients were determined based on Wilson plot method, the most suitable approach...

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• INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER

  Czasopisma

  ISSN: 0017-9310 , eISSN: 1879-2189

• HEAT TRANSFER ENGINEERING

  Czasopisma

  ISSN: 0145-7632 , eISSN: 1521-0537

• Influence of metallic porous microlayer on pressure drop and heat transfer of stainless steel plate heat exchanger

  Publikacja

  • J. Wajs
  • D. Mikielewicz

  - Rok 2014

  The experimental analysis of passive heat transfer intensification in the case of plate heat exchanger has been carried out. On the heat transfer surface of heat exchanger the metallic porous layer was created. The experiment was accomplished in two stages. In the first stage the commercial stainless steel gasketed plate heat exchanger was investigated, while in the second one – the identical heat exchanger but with the modified...

• Influence of metallic porous microlayer on pressure drop and heat transfer of stainless steel plate heat exchanger

  Publikacja

  • J. Wajs
  • D. Mikielewicz

  - APPLIED THERMAL ENGINEERING - Rok 2016

  The experimental analysis of passive heat transfer intensification in the case of plate heat exchanger has been carried out. The metallic porous layer was created on the heat transfer surface of analyzed unit. The experiment was accomplished in two stages. In the first stage the commercial stainless steel gasketed plate heat exchanger was investigated, while in the second one – the identical heat exchanger but with the modified...

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• Plate heat exchanger with porous structure for potential use in ORC system

  Publikacja

  • J. Wajs
  • D. Mikielewicz
  • E. Fornalik-Wajs

  - Rok 2014

  The experimental analysis of passive heat transfer intensification in the case of plate heat exchanger has been carried out. The passive intensification was obtained by a modification of the heat transfer surface, which was covered by a metallic porous microlayer. The experiment was accomplished in two stages. In the first stage the commercial stainless steel gasketed plate heat exchanger was investigated, while in the second one...

• Plate heat exchanger with porous structure for potential use in ORC system

  Publikacja

  • J. Wajs
  • D. Mikielewicz
  • E. Fornalik-Wajs

  - Mechines Technologies Materials - Rok 2014

  The experimental analysis of passive heat transfer intensification in the case of plate heat exchanger has been carried out. The passive intensification was obtained by a modification of the heat transfer surface, which was covered by a metallic porous microlayer. The experiment was accomplished in two stages. In the first stage the commercial stainless steel gasketed plate heat exchanger was investigated, while in the second one...

• Impact of the type of heat exchanger on the characteristics of low-temperature thermoacoustic heat engines

  Publikacja

  • V. Korobko
  • A. Shevtsov
  • S. Serbin
  • H. Wen
  • M. Dzida

  - International Journal of Thermofluids - Rok 2024

  Thermoacoustic technologies are considered an effective solution for harnessing low-temperature heat, whether from waste or renewable sources. However, in practice, developing and implementing high-performance ther- moacoustic systems is a complex challenge. In real waste heat recovery systems, heat exchange between ther- moacoustic engines (TAEs) and external heat sources is facilitated by auxiliary systems, such as circulation...

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• Intensification of thermal convection near electric devices using flat screens – computer modelling

  Publikacja

  • S. Czapp
  • M. Czapp

  - Elektronika Ir Elektrotechnika - Rok 2013

  Intensification of natural thermal convection near electric devices is possible by application of additional elements as screens creating convection canals close to the device. In the earlier authors paper the results of the analysis of thermal convection with the use of only one additional screen close to the electric device were presented. This paper presents computer modelling of thermal convection when two screens near the...

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• Performance analyses of helical coil heat exchangers. The effect of external coil surface modification on heat exchanger effectiveness

  Publikacja

  • R. Andrzejczyk
  • T. Muszyński

  - Archives of Thermodynamics - Rok 2016

  The shell and coil heat exchangers are commonly used in heating, ventilation, nuclear industry, process plant, heat recovery and air conditioning systems. This type of recuperators benefits from simple construction, the low value of pressure drops and high heat transfer. In helical coil,centrifugal force is acting on the moving fluid due to the curvature of thetube results in the development. It has been long recognized that the...

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• Effect of surface roughness on thermal-hydraulic characteristics of plate heat exchanger

  Publikacja

  • J. Wajs
  • D. Mikielewicz

  - Key Engineering Materials - Rok 2014

  In the paper the experimental analysis of passive heat transfer intensification in the case of modeled plate heat exchanger is conducted. The plate heat exchanger is chosen for the analysis because this kind of heat exchangers could be prospectively applied in the ORC systems, however other areas or application are equally possible. The experimental setup was assembled at the Department of Energy and Industrial Apparatus of Gdansk...

• Exchange-Traded Funds in Europe

  Publikacja

  • A. Marszk
  • E. Lechman

  - Rok 2019

  Exchange-Traded Funds in Europe provides a single point of reference on a diverse set of regional ETF markets, illuminating the roles ETFs can play in risk mitigation and speculation. Combining empirical data with models and case studies, the authors use diffusion models and panel/country-specific regressions—as well as graphical and descriptive analyses— to show how ETFs are more than conventional, passive investments. With new...

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