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Wyszukujesz frazę "cooling technologies" wg kryterium: Temat


Wyświetlanie 1-10 z 10
Tytuł:
Flat polymer loop thermosyphons
Autorzy:
Vasiliev, L.
Grakovich, L.
Rabetsky, M.
Zhuravlyov, A.
Vassiliev Jr., L.
Powiązania:
https://bibliotekanauki.pl/articles/240396.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermosyphon
heat pipe
heat transfer
cooling technologies
air conditioning
refrigeration
LED cooling systems
termosyfon
rura cieplna
wymiana ciepła
technologie chłodnicze
klimatyzacja
chłodnictwo
Opis:
The flat horizontal polymer loop thermosyphon with flexible transport lines is suggested and tested. The thermosyphon envelope consists of a polyamide composite with carbon based high thermal conductive micro-, nanofilaments and nanoparticles to increase its effective thermal conductivity up to 11 W/(m°C). Rectangular capillary mini grooves inside the evaporator and condenser of thermosyphon are used as a mean of heat transfer enhancement. The tested working fluid is R600. Thermosyphon evaporator and condenser are similar in design, have a long service life. In this paper three different methods (transient, quasi-stationary, and stationary) have been used to determine the thermophysical properties of polymer composites used as an envelope of thermosyphon, which make it possible to design a wide range of new heat transfer equipment. The results obtained contribute to establish the viability of using polymer thermosyphons for ground heat sinks (solar energy storage), gas-liquid heat exchanger applications involving seawater and other corrosive fluids, efficient cooling of superconductive magnets impregnated with epoxy/carbon composites to prevent wire movement, enhance stability, and diminish heat generation.
Źródło:
Archives of Thermodynamics; 2018, 39, 1; 75-90
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Review of Desiccant Dehumidification Technology
Autorzy:
Al-Ahmedi, Karrar
Powiązania:
https://bibliotekanauki.pl/articles/132065.pdf
Data publikacji:
2020
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
dehumidification technologies
solar cooling
Opis:
This study focuses on dehumidification technologies. It identifies the different types of dehumidification technologies and seeks to understand each technology’s competitive advantages. On the various technologies, the study concentrates on three standard systems. The systems are the solid desiccant-wheel, solid desiccant air conditioner, and the liquid desiccant dehumidification system. The study establishes the characteristics of each of them and how they can be preferred. The study also looks at the applicability of the technologies to different uses and discusses in details application in hotels, supermarkets, and office blocks. In these application areas, the study focuses on benefits and possible consequences for the non-adoption of such systems. The study establishes reasons to support the relevance of this technology to those essential industries. This study concludes by looking at current developments in dehumidification technology. A focus is made on the drivers for the advancement and a discussion of some of the recent improvements. The study adopts this discussion to help advise on the future of dehumidification technology.
Źródło:
Modern Engineering; 2020, 1; 38-42
2450-5501
Pojawia się w:
Modern Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Passive energy reduction technologies in environmental engineering
Technologie pasywnego ograniczania zużycia energii w inżynierii środowiska
Autorzy:
Lesiak, P.
Powiązania:
https://bibliotekanauki.pl/articles/402128.pdf
Data publikacji:
2018
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
passive technologies
cooling
cooling coatings
green facades
technologie pasywne
chłodzenie
powłoki chłodzące
zielone fasady
Opis:
The paper presents a review of passive techniques used in environmental engineering and construction, aimed at reducing energy consumption for heating or cooling purposes. These are: green facades, cooling coatings, thermopaints, heater screens, shutters and other solutions. Their disadvantages, advantages and working methods were discussed. The heat gain calculations for the exemplary building whose baffles were painted with pigmented pigment with varying degrees of dilution resulted in a facade of varying color intensity. It has been found that by applying bright colors, nearly 30 percent of energy consumption for cooling purposes for heat gains through opaque seams compared to dark colors has been reduced.
W pracy przedstawiono przegląd technik pasywnych stosowanych w inżynierii środowiska i budownictwie, których zadaniem jest ograniczenie zużycia energii na cele grzewcze lub chłodnicze. Są to: zielone fasady, powłoki chłodzące, termofarby, ekrany zagrzejnikowe, żaluzje oraz inne rozwiązania. Przedyskutowano ich wady, zalety oraz sposób pracy. Przedstawiono również obliczenia zysków ciepła dla przykładowego budynku, którego przegrody zostały pomalowane farbą zabarwioną pigmentem o różnym stopniu rozcieńczenia, czego wynikiem jest fasada o różnej intensywności koloru. Stwierdzono, że przez zastosowanie jasnego koloru doszło do obniżenia o blisko 30 procent zużycia energii na cele chłodnicze dla zysków ciepła przez przegrody nieprzezroczyste w porównaniu z ciemną barwą.
Źródło:
Structure and Environment; 2018, 10, 2; 161-169
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer control the cooling process in permanent mold casting of Al-Si alloy
Sterowanie komputerowe procesem chłodzenia formy w odlewaniu kokilowym siluminów
Autorzy:
Władysiak, R.
Powiązania:
https://bibliotekanauki.pl/articles/353901.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative materials & casting technologies
cooling
water mist
Al-Si alloy
innowacyjne materiały i technologie odlewnicze
chłodzenie
mgła wodna
stop Al-Si
Opis:
The paper presents the test results of a computerized control system the sequential cooling process of permanent mold with use of water mist in the gravity die casting process. It describes the process for preparing high-quality casts made of AlSi7Mg alloy that achieves enhanced mechanical properties. A scheme of developed device and drivers for selected methods of sequence cooling for manufacturing of castings made in permanent steel mold was presented here. Also the microstructure and mechanical properties of received aluminium casts were described. It was shown that the use of a computer system to control the water mist cooling point of the mold not only accelerates the cooling of the cast and the gravity die casting cycle shortens, but also it has a positive effect on the microstructure and mechanical properties of castings made of unmodified AlSi7Mg alloy in a raw state.
W pracy przedstawiono wyniki badań komputerowego systemu sterowania sekwencyjnym chłodzeniem kokili mgła wodna w odlewaniu grawitacyjnym. Opisano proces otrzymywania wysokojakościowych odlewów z siluminu AlSi7Mg o podwyższonych właściwościach mechanicznych. Przedstawiono opracowane urządzenie, programy sterujące dla zadanych metod wytwarzania odlewów kokilowych i sekwencji chłodzenia. Przedstawiono mikrostrukturę i własności mechaniczne otrzymanych odlewów siluminowych. W pracy wykazano, że zastosowanie systemu komputerowego do sterowania chłodzeniem punktowego mgła wodna nie tylko przyspiesza stygnięcie odlewu i skraca cykl odlewania kokilowego, ale również korzystnie wpływa na mikrostrukturę i własności mechaniczne odlewów z niemodyfikowanego siluminu AlSi7Mg w stanie surowym.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 3; 977-980
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Crystallization Process of Intensive Cooled AlSi20CuNiCoMg Alloy
Autorzy:
Władysiak, R.
Kozuń, A.
Dębowska, K.
Pacyniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/379541.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technologies
innovative foundry materials
casting die cooling
water mist
silumin
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
odlewanie kokilowe
mgła wodna
Opis:
The work is a continuation of research concerning the influence of intensive cooling of permanent mold in order to increase the casting efficiency of aluminium alloys using the multipoint water mist cooling system. The paper presents results of investigation of crystallization process and microstructure of multicomponent synthetic hypereutectic alloy AlSi20CuNiCoMg. The study was conducted for unmodified silumin on the research station allowing the cooling of the special permanent sampler using a program of computer control. Furthermore the study used a thermal imaging camera to analyze the solidification process of multicomponent alloy. The study demonstrated that the use of mold cooled with water mist stream allows in wide range to form the microstructure of hypereutectic multicomponent silumin. It leads to higher homogeneity of microstructure and refinement of crystallizing phases of casting.
Źródło:
Archives of Foundry Engineering; 2017, 17, 2; 137-144
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Water Mist Cooling on Microstructure of Hypereutectic Al-Si Alloy
Autorzy:
Władysiak, R.
Kozuń, A.
Powiązania:
https://bibliotekanauki.pl/articles/382973.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technologies
innovative foundry materials
casting die cooling
water mist
hypereutectic silumin
microstructure
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
chłodzenie
silumin nadeutektyczny
mikrostruktura
Opis:
The work is a continuation of research on the use water mist cooling in order to increase efficiency of die-casting aluminum alloys using multipoint water mist cooling system. The paper presents results of investigation of crystallization process and microstructure of synthetic hypereutectic AlSi20 alloy. Casts were made in permanent mold cooled with water mist stream. The study was conducted for unmodified AlSi20 alloy and modified with phosphorus, titanium and boron on the research station allowing sequential multipoint cooling using a dedicated program of computer control. The study demonstrated that the use of mold cooled with water mist stream allows the formation of the microstructure of hypereutectic silumins. A wide range of solidification temperature of hypereutectic silumins increases the potential impact of changes in the cooling rate on a size, a number and a morphology of preeutectic silicon and eutectic α+β (Al+Si).
Źródło:
Archives of Foundry Engineering; 2014, 14, 3; 117-122
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Cooling Rate on Microstructure of Thin-Walled Vermicular Graphite Iron Castings
Autorzy:
Górny, M.
Kawalec, M.
Sikora, G.
Powiązania:
https://bibliotekanauki.pl/articles/380738.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technologies
innovative materials
vermicular graphite cast iron
cooling rate
thermal analysis
microstructure
innowacyjne technologie odlewnicze
materiały innowacyjne
żeliwo grafitowe wermikularne
chłodzenie
analiza termiczna
mikrostruktura
Opis:
This article addresses the effect of cooling rate and of titanium additions on the microstructure of thin-walled vermicular graphite iron (TWCI) castings as determined by changing molding media, section size and Ferro Titanium. The research work was carried out on TWCI castings and reference castings of 2-5 mm and 13-mm wall thickness, respectively. Various molding materials were employed (silica sand and insulating sand ‘‘LDASC’’) to achieve different cooling rates. Thermal analysis was implemented for determinations of the actual cooling rates at the onset of solidification. This study shows that the cooling rates exhibited in the TWCI castings varies widely (70- 14oC/s) when the wall thickness is changed from 2 to 5 mm. In turn, this is accompanied by a significant variation in the vermicular graphite fraction. The resultant cooling rates were effectively reduced by applying an insulating sand in order to obtain the desired vermicular graphite shape. In addition, good agreement was found between the theoretical predictions of the solidification process and the experimental outcome. Ti additions in combination with LDASC sand molds were highly effective in promoting the development of over 80 % vermicular graphite in castings with wall thicknesses of 2 and 3 mm as evidenced by quantitative metallographic analyses.
Źródło:
Archives of Foundry Engineering; 2014, 14, 1 spec.; 139-142
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of water mist stream and its impact on cooling efficiency of casting die
Autorzy:
Władysiak, R.
Budzyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/382910.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
odlewanie kokilowe
mgła wodna
mikrostruktura
strumień ciepła
innovative foundry technologies
innovative foundry material
casting die cooling
water mist
microstructure
heat flux
Opis:
The work is a continuation of research on the use water mist cooling in order to increase efficiency of die-casting aluminum alloys. The paper presents results of research and analysis process, spraying water and generated a stream of water mist, the effect of the type of nozzle, the nozzle size and shape of the emitting of the water mist on the wall surface of casting die on the microstructure and geometry of water mist stream and cooling efficiency. Tests were used to perform high-speed camera to record video in the visible and infrared camera. Results were used to develop a computerized image analysis and statistical analysis. The study showed that there are statistical relationships between water and air flow and geometry of the nozzle and nozzle emitting a stream of microstructure parameters of water mist and heat the incoming stream. These relationships are described mathematical models that allow you to control the generating of adequate stream of water mist and a further consequence, the cooling efficiency of casting die.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2; 251-260
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of multipoint sequential water mist cooling of casting die on microstructure and mechanical properties of AlSi11 alloy
Autorzy:
Władysiak, R.
Powiązania:
https://bibliotekanauki.pl/articles/380430.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
odlewanie kokilowe
mgła wodna
AlSi11
mikrostruktura
właściwości mechaniczne
innovative foundry technologies
innovative foundry materials
casting die cooling
water mist
microstructure
mechanical properties
Opis:
The work is a continuation of research on the use of water mist cooling in order to increase efficiency of the die-casting process for aluminum alloys. The paper describes the multipoint sequential cooling system of the casting die and its computer control and monitoring. It also includes results of the tests and analysis of cooling methods during making of the casting. These methods differ from each other in the sequence of casting die cooling and cause effective changes in microstructure and mechanical properties of castings made of AlSi11 alloy. The study demonstrated that the use of multipoint sequential cooling with water mist affects the microstructure refinement and reduces the segregation in the cast as well as more than by 20% increases the mechanical properties of castings in the rough state. The study also demonstrates that the sequential cooling of casting die accelerates the cooling of the casting and shortens die-casting cycle.
Źródło:
Archives of Foundry Engineering; 2012, 12, 4; 145-150
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality Index of the AlSi7Mg0.3 Aluminium Casting Alloy Depending on the Heat Treatment Parameters
Autorzy:
Czekaj, E.
Zych, J.
Kwak, Z.
Garbacz-Klempka, A.
Powiązania:
https://bibliotekanauki.pl/articles/380520.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technologies
innovative foundry materials
Al-Si alloy
quality index
heat treatment
jet cooling
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
stop Al-Si
wskaźnik jakości
obróbka cieplna
chłodzenie
Opis:
Issues connected with high quality casting alloys are important for responsible construction elements working in hard conditions. Traditionally, the quality of aluminium casting alloy refers to such microstructure properties as the presence of inclusions and intermetallic phases or porosity. At present, in most cases, Quality index refers to the level of mechanical properties – especially strength parameters, e.g.: UTS, YS, HB, E (Young’s Modulus), K1c (stress intensity factor). Quality indexes are often presented as a function of density. However, generally it is known, that operating durability of construction elements depends both on the strength and plastic of the material. Therefore, for several years now, in specialist literature, the concept of quality index (QI) was present, combines these two important qualities of construction material. The work presents the results of QI research for casting hypoeutectic silumin type EN AC-42100 (EN AC-AlSi7Mg0.3), depending on different variants of heat treatment, including jet cooling during solution treatment.
Źródło:
Archives of Foundry Engineering; 2016, 16, 3; 25-28
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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