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Tytuł:
Impact of the manufacturing conditions and operating position on heat transport ability of the heat pipe filled with Fluorinert FC-72
Autorzy:
Čaja, A.
Nemec, P.
Mančikova, V.
Malcho, M.
Powiązania:
https://bibliotekanauki.pl/articles/402136.pdf
Data publikacji:
2014
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
heat pipe
heat transport
cooling
Opis:
Heat pipes are devices, which transfer heat at a minimum temperature difference between evaporating and condensing phase. Operating temperature of heat pipe is determined by the working fluid and vacuum achieved during its production. This paper is focused on the determining the effect of the initial temperature of the ambient air to the performance characteristics of produced heat pipes. In general, the decrease in pressure decreases the boiling liquid. Based on this it can be presumed that achieving a lower temperature during production of heat pipe, the lower vacuum, the boiling point of working fluid while increasing ability of heat transport in various positions.
Źródło:
Structure and Environment; 2014, 6, 2; 44-47
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of construction of a catalytic reactor for methane oxidising in ventilation air in coal mines and the research on integrated “heat pipe” recuperator
Autorzy:
Hys, L.
Powiązania:
https://bibliotekanauki.pl/articles/124448.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heat pipe
recuperator
catalytic reactor
Opis:
The article presents the analysis whose result is the selection of appropriate design and construction of a monolithic CMR reactor intended for oxidising methane from ventilation air in coal mines. The description of “heat-pipe” recuperator cooperating with the reactor was also presented. The research was mainly aimed at verifying the compliance with the work of autothermity premise obtained by the return of part of heat from catalytic reaction. The result of research was to define the range volumetric fume expense ensuring autothermity and the definition of maximum recuperator efficiency. The range of volumetric expense was 18–25 m3/h and maximum value of efficiency coefficient was η = 0.50 for the volumetric expense of 18 m3/h.
Źródło:
Journal of Ecological Engineering; 2013, 14, 2; 31-35
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Visualization of heat transport in heat pipes using thermocamera
Autorzy:
Nemec, P.
Caja, A.
Lenhard, R.
Powiązania:
https://bibliotekanauki.pl/articles/239979.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rura cieplna
termowizja
heat pipe
thermovision
Opis:
Heat pipes, as passive elements show a high level of reliability when taking heat away and they can take away heat flows having a significantly higher density than systems with forced convection. A heat pipe is a hermetically closed duct, filled with working fluid. Transport of heat in heat pipes is procured by the change of state of the working fluid from liquid state to steam and vice versa and depends on the hydrodynamic and heat processes in the pipe. This study have been focused on observing the impact these processes have on the heat process, the transport of heat within the heat pipe with the help of thermovision. The experiment is oriented at scanning the changes in the surface temperatures of the basic structural types of capillary heat pipes in vertical position.
Źródło:
Archives of Thermodynamics; 2010, 31, 4; 125-132
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation of gravity-assisted wickless heat pipes (thermosyphons) at low heat inputs for solar application
Autorzy:
Al-Joboory, Hassan Naji Salman
Powiązania:
https://bibliotekanauki.pl/articles/240582.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wickless heat pipe
adiabatic section
solar heat pipe
fill charge ratio
working fluid inventory
inclination angle
Opis:
The performance of ten wickless heat pipes without adiabatic sections is investigated experimentally at low heat inputs 120 to 2000 W/m2 for use in solar water heaters. Three heat pipe diameter groups were tested, namely 16, 22, and 28.5 mm. Each group had evaporator lengths of 1150, 1300, and 1550 mm, respectively, with an extra evaporator length of 1800 mm added to the second group. The condenser section length of all heat pipes was 200 mm. Ethanol, methanol, and acetone were utilized as working fluids, at inventory of 25%, 50%, 70%, and 90% by evaporator volume respectively. The 22 mm diameter pipes were tested at inclination angles 30°, 45°, and 60°. Other diameter groups were tested at 45° only. Experiments revealed increased surface temperatures and heat transfer coefficients with increased pipe diameter and evaporator length, and that increased working fluid inventory caused pronounced reduction in evaporator surface temperature accompanied by improved heat transfer coefficient to reach maximum values at 50% inventory for the selected fluids. Violent noisy shocks were observed with 70% and 90% inventories with the tested heat pipes and the selected working fluids with heat flux inputs from 320–1900 W/m2. These shocks significantly affected the heat pipes heat transfer capability and operation stability. Experiments revealed a 45° and 50% optimum inclination angle of fill charge ratio respectively, and that wickless heat pipes can be satisfactorily used in solar applications. The effect of evaporator length and heat pipe diameter on the performance was included in data correlations.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 257-276
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental determination of the working fluid volume for optimal function of the loop heat pipe
Autorzy:
Hrabovský, P.
Nemec, P.
Malcho, M.
Jandačka, J.
Powiązania:
https://bibliotekanauki.pl/articles/402058.pdf
Data publikacji:
2013
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
loop heat pipe
heat transfer
cooling
working fluid
Opis:
This experiment is concentrated on the working fluid of the heat pipe. The working fluid is an important part for the function of the heat pipe regarding the transfer of the heat. The measurements point out the appropriate quantity of the working fluid regarding the correct function of the loop heat pipe in the cooling of electronic components.
Źródło:
Structure and Environment; 2013, 5, 4; 29-31
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of working position for thermal performance of the capillary heat pipe
Autorzy:
Kosa, L.
Jobb, M.
Nemec, P.
Malcho, M.
Powiązania:
https://bibliotekanauki.pl/articles/402189.pdf
Data publikacji:
2014
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
capillary heat pipe
thermal performance
working position
Opis:
This experiment is concentrated on working position for optimization of capillary heat pipe. The main objective was to find optimal working position for capillary heat pipe. Working position is an important part for function of the heat pipe. A change in working position should change thermal performance of capillary heat pipe.
Źródło:
Structure and Environment; 2014, 6, 1; 46-48
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Challenges in operating and testing loop heat pipes in 500–700 K temperature ranges
Autorzy:
Szymański, Paweł
Mikielewicz, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/2091372.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
loop heat pipe
working fluid
material compatibility
Opis:
The potential applications of loop heat pipes (LHPs) are the nuclear power space systems, fuel cell thermal management systems, waste heat recovery systems, medium temperature electronic systems, medium temperature military systems, among others. Such applications usually operate in temperature ranges between 500–700 K, hence it is necessary to develop an LHP system that will meet this requirement. Such a thermal management device require to meet various technical problems and challenges currently existing in the development of LHP working in medium temperatures, including: (1) selection of appropriate working fluid; (2) selection of appropriate LHP construction material; (3) construction of suitable test rig capable of testing at elevated temperatures; (4) development of new testing methods. Currently, there are no proven working fluids that can be used in LHPs in medium temperature ranges. Water can be applicable only at temperatures up to 570 K. Caesium can be applicable at temperatures above 670 K. Organic fluids usually tend to generate non-condensable gasses and/or decompose at elevated temperatures and their viscosity dramatically increases. For halides, most of them are very reactive or toxic and their full property data are not available or the majority of the physical properties are predicted, also live tests and their environmental impact data are not adequate. As for casing/LHP construction material, there are no full chemical compatibility tables with most of the medium temperature working fluids and the reactivity of fluids significantly limits the potential materials. Also, testing such an LHP is an endeavour as the reactivity of medium temperature fluids and the use of obscure metals create new challenges. Altogether creates multiple challenges in the development, testing, handling and operating of LHP in the medium temperature range.
Źródło:
Archives of Thermodynamics; 2022, 43, 2; 61--73
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental measurements of gravity heat pipe with NH3 medium to obtain low-potential geothermal heat
Badania eksperymentalne rury cieplnej z czynnikiem NH3 do odzysku niskotemperaturowej energii geotermalnej
Autorzy:
Vantúch, M.
Kapjor, A.
Bánovčan, R.
Kadúchová, K.
Powiązania:
https://bibliotekanauki.pl/articles/402138.pdf
Data publikacji:
2018
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
heat pipe
geothermal energy
rura cieplna
energia geotermalna
Opis:
Earth / water heat pumps using vertical heat exchangers do not require large areas and do not depend on the intensity of the sun’s radiation that strikes the surface of the earth. Vertical heat exchangers work efficiently in virtually all geological environments, except for low thermal conductivity soils such as dry sand or dry gravel. As the forced circulation media is selected anti-freeze mixtures with water in proportion to the requirements of the operating conditions. Circulation of the working medium in the deep hole requires circulation pump. The paper presents a design of equipment for the usage of low- potential heat collected from rock in a deep borehole by means of heat pipes (HP). Part of the paper deals with the processing of measurement results gathered from the comparative experimental equipment requiring forced and unforced circulation (heat pipe) of the working substance on the primary side of the heat pump.
Gruntowe pompy ciepła współpracujące z wymiennikami pionowymi nie wymagają znacznej powierzchni terenu i nie są uzależnione od natężenia promieniowania słonecznego padającego na powierzchnię Ziemi. Gruntowe pionowe wymienniki ciepła działają wydajnie praktycznie w większości gruntów, oprócz tych o niskiej przewodności cieplnej takich jak suchy piasek czy suchy żwir. Czynnikiem roboczym jest niezamarzający roztwór wodny o składzie wynikającym z wymagań eksploatacyjnych. Przepływ czynnika w obiegu zapewnia pompa cyrkulacyjna. Artykuł prezentuje projekt układu do odzysku niskotemperaturowej energii geotermalnej przy użyciu pompy ciepła współpracującej z pionowym wymiennikiem gruntowym. Część artykułu dotyczy obróbki danych pomiarowych zebranych porównawczo dla obiegu wymuszonego i cyrkulacji naturalnej (jako rura cieplna) czynnika roboczego.
Źródło:
Structure and Environment; 2018, 10, 1; 82-86
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring thermal performance of gravitational heat pipes depending on the amount of working fluid
Autorzy:
Jobb, M.
Nemec, P.
Kosa, L.
Malcho, M.
Powiązania:
https://bibliotekanauki.pl/articles/402517.pdf
Data publikacji:
2014
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
gravity heat pipe
working substance ethanol
performance parameter
Opis:
This paper deals with an impact of working medium on the performance parameters of the heat pipe. The aim was to find the ideal amount of working fluid used in gravitational heat pipes. For the working medium 96% alcohol was selected.
Źródło:
Structure and Environment; 2014, 6, 1; 43-45
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal analysis of a gravity-assisted heat pipe working with zirconia-acetone nanofluids: An experimental assessment
Autorzy:
Abdolhossein Zadeh, Amin
Nakhjavani, Shima
Powiązania:
https://bibliotekanauki.pl/articles/240484.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat pipe
zirconia-acetone nanofluid
tilt angle
filling ratio
Opis:
An experimental investigation was performed on the thermal performance and heat transfer characteristics of acetone/zirconia nanofluid in a straight (rod) gravity-assisted heat pipe. The heat pipe was fabricated from copper with a diameter of 15 mm, evaporator-condenser length of 100 mm and adiabatic length of 50 mm. The zirconia-acetone nanofluid was prepared at 0.05–0.15% wt. Influence of heat flux applied to the evaporator, filling ratio, tilt angle and mass concentration of nanofluid on the heat transfer coefficient of heat pipe was investigated. Results showed that the use of nanofluid increases the heat transfer coefficient while decreasing the thermal resistance of the heat pipe. However, for the filling ratio and tilt angle values, the heat transfer coefficient initially increases with an increase in both. However, from a specific value, which was 0.65 for filling ratio and 60–65 deg for tilt angle, the heat transfer coefficient was suppressed. This was attributed to the limitation in the internal space of the heat pipe and also the accumulation of working fluid inside the bottom of the heat pipe due to the large tilt angle. Overall, zirconia-acetone showed a great potential to increase the thermal performance of the heat pipe.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 65-83
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Capillary Pumped Loop as a tool for collecting large heat fluxes from electronic devices on warships
Autorzy:
Mikielewicz, D.
Szymański, P.
Powiązania:
https://bibliotekanauki.pl/articles/260217.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Loop Heat Pipe
Capillary Pumped Loop
Porous Media
Multiphase Flow
Heat Transfer
Opis:
The combat potential of future warships will be directly related to the use of modern electronic devices being parts of advanced systems, such as, for instance, radar systems, fire aiming systems, fire detection systems, electric drive systems, and even electronic and radio-electronic weaponry, railguns and lasers, installed on these warships. The capacity and functionality of these devices is continually increasing, at decreasing mass and dimensions, which results in higher power consumption. Heat collection becomes a growing problem in operation of these devices. The paper presents a concept of the use of the CPL (Capillary Pumped Loop) cycle for passive heat collection from precise electronic devices used on warships. It also includes the description of the experimental rig and discussion of the results of laboratory tests performed on this rig and confirmed using the mathematical model developed by the authors.
Źródło:
Polish Maritime Research; 2017, 1; 72-80
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The ecological impact of using photothermal and photovoltaic installations for DHW preparation
Ekologiczny wpływ zastosowania instalacji footermicznej i fotowoltaicznej do przygotowania ciepłej wody użytkowej
Autorzy:
Olczak, Piotr
Olek, Małgorzata
Kryzia, Dominik
Powiązania:
https://bibliotekanauki.pl/articles/282886.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
photovoltaic panel
reduction of CO2 emission
evacuated tube collector with heat pipe
panel fotowoltaiczny
redukcja emisji CO2
próżniowy kolektor rurowy typu heat pipe
Opis:
A domestic hot water (DHW) system has been modernized in a multi-family house, located in the southeastern part of Poland, inhabited by 105 people. The existing heating system (2 gas boilers) was extended by a solar system consisting of 32 evacuated tube collectors with a heat pipe (the absorber area: 38.72 m2). On the basis of the system performance data, the ecological effect of the modernization, expressed in avoided CO2 emission, was estimated. The use of the solar thermal system allows CO2 emissions to be reduced up to 4.4 Mg annually. When analyzing the environmental effects of the application of the solar system, the production cycle of the most material-consuming components, namely: DHW storage tank and solar collectors, was taken into account. To further reduce CO2 emission, a photovoltaic installation (PV), supplying electric power to the pump-control system of the solar thermal system has been proposed. In the Matlab computing environment, based on the solar installation measurement data and the data of the total radiation intensity measurement, the area of photovoltaic panels and battery capacity has been optimized. It has been shown that the photovoltaic panel of approx. 1.8 m2 and 12 V battery capacity of approx. 21 Ah gives the greatest ecological effects in the form of the lowest CO2 emission. If a photovoltaic system was added it could reduce emissions by up to an additional 160 kg per year. The above calculations take also emissions resulting from the production of PV panels and batteries into account.
W budynku wielorodzinnym położonym w południowo-wschodniej części Polski, zamieszkałym przez 105 osób, zmodernizowano system przygotowania ciepłej wody użytkowej. Istniejący system grzewczy (2 kotły gazowe) został rozbudowany o układ kolektorów słonecznych składający się z 32 próżniowych kolektorów rurowych (powierzchnia absorbera wynosi 38,72 m2). Na podstawie danych o wydajności systemu oszacowano ekologiczny efekt modernizacji, wyrażony jako uniknięta emisja CO2. Zastosowanie systemu kolektorów słonecznych pozwala zmniejszyć emisję CO2 do 4,4 Mg rocznie. Analizując skutki środowiskowe zastosowania instalacji kolektorów słonecznych, wzięto pod uwagę cykl produkcyjny najbardziej materiałochłonnych komponentów instalacji, a mianowicie zasobnika ciepłej wody użytkowej i kolektorów słonecznych. Aby jeszcze bardziej ograniczyć emisję CO2, zaproponowano instalację fotowoltaiczną, dostarczającą energię elektryczną do napędu pompy obiegowej instalacji kolektorów słonecznych. W środowisku obliczeniowym Matlab, na podstawie danych pomiarowych z instalacji kolektorów słonecznych i danych pomiarowych całkowitego natężenia promieniowania, zoptymalizowano powierzchnię paneli fotowoltaicznych i pojemność akumulatorów. Wykazano, że układ paneli fotowoltaicznych o powierzchni ok. 1,8 m2 oraz akumulatorów 12 V o pojemności ok. 21 Ah zapewnia największy efekt ekologiczny w postaci najniższej emisji CO2. Dodanie paneli fotowoltaicznych może zmniejszyć roczną emisję CO2 nawet o dodatkowe 160 kg. Powyższe obliczenia uwzględniają również emisje wynikające z tytułu produkcji paneli fotowoltaicznych i akumulatorów.
Źródło:
Polityka Energetyczna; 2020, 23, 1; 65-74
1429-6675
Pojawia się w:
Polityka Energetyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of filling ratio on thermal performance and thermal parameters of closed loop pulsating heat pipes
Autorzy:
Kolková, Z.
Malcho, M.
Powiązania:
https://bibliotekanauki.pl/articles/402056.pdf
Data publikacji:
2013
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
closed loop pulsating heat pipe
thermal performance
evaporation
condensation
filling ratio
thermal resistance
temperature
Opis:
Improving the performance of electrical components needs higher heat removal from these systems. One of the solutions available is to use a sealed heat pipe with a throbbing filling, where development meets the current requirements for intensification of heat removal and elimination of moving parts cooling systems. Heat pipes operate using phase change working fluid, and it is evaporation and condensation. They have a meandering shape and are characterized by high intensity of heat transfer, high durability and reliability. Advantage of these tubes is that it is not necessary to create the internal capillary structure for transporting liquid and they need no pump to the working fluid circulation. They have a simple structure, low cost, high performance, and they can be used for various structural applications. The choice of working fluid volume and performance affects thermal performance. Distilled water, ethanol and acetone were used in the performance ranges of 0-80%.
Źródło:
Structure and Environment; 2013, 5, 4; 37-40
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and theoretical investigation of an evacuated tube solar water heater incorporating wickless heat pipes
Autorzy:
Al-Joboory, Hassan Naji Salman
Powiązania:
https://bibliotekanauki.pl/articles/240588.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wickless heat pipe
fill charge
electrical analogy
evacuated tube solar collector
water heater
performance
Opis:
The present work involved an extensive outdoor performance testing program of a solar water heating system that consists of four evacuated tube solar collectors incorporating four wickless heat pipes integrated to a storage tank. Tests were conducted under the weather conditions of Baghdad, Iraq. The heat pipes were of 22 mm diameter, 1800 mm evaporator length and 200 mm condenser length. Three heat pipe working fluids were employed, ethanol, methanol, and acetone at an inventory of 50% by volume of the heat pipe evaporator sections. The system was tested outdoors with various load conditions. Results showed that the system performance was not sensitive to the type of heat pipe working fluid employed here. Improved overall efficiency of the solar system was obtained with hot water withdrawal (load conditions) by 14%. A theoretical analysis was formulated for the solar system performance using an energy balance based iterative electrical analogy formulation to compare the experimental temperature behavior and energy output with theoretical predictions. Good agreement of 8% was obtained between theoretical and experimental values.
Źródło:
Archives of Thermodynamics; 2020, 41, 3; 3-31
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the influence of capillary effect on operation of the loop heat pipe
Autorzy:
Mikielewicz, D.
Błauciak, K.
Powiązania:
https://bibliotekanauki.pl/articles/240739.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
loop heat pipe
capillary forces
waste heat recovery
rurka ciepła z pętlą obiegową
siły kapilarne
wykorzystanie energii odpadowej
Opis:
In the paper presented are studies on the investigation of the capillary forces effect induced in the porous structure of a loop heat pipe using water and ethanol ad test fluids. The potential application of such effect is for example in the evaporator of the domestic micro-CHP unit, where the reduction of pumping power could be obtained. Preliminary analysis of the results indicates water as having the best potential for developing the capillary effect.
Źródło:
Archives of Thermodynamics; 2014, 35, 3; 59-80
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
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