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Wyświetlanie 1-15 z 465
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:
The coefficient of head loss at the pipe bend 90° with the sliced bend
Autorzy:
Abduh, Moh
Suhardjono, Suhardjono
Sumiadi, Sumiadi
Dermawan, Very
Powiązania:
https://bibliotekanauki.pl/articles/293330.pdf
Data publikacji:
2020
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
direction change
head loss
loss coefficient
pipeline network
sliced bend
slice numbers
Opis:
The head loss is a decrease in compressive height caused by friction and direction changes of flow at the sliced bend. This method expected to provide is easy, fast, and economical. The elements of influence are the velocity of flow, the number of slices, average length of sliced walls, angle changes of the sliced, coefficient of friction, acceleration of gravity, and slope of the pipe. Equation for coefficient of head loss (Kb) is an analysis method for the head loss (hL) calculation. The analysis results that have obtained are the larger diameter of the pipe, and the more slices with a fixed discharge, the coefficient of hL becomes small. Conversely, if the diameter of the pipe is getting smaller, and the slice is getting less, then the coefficient of hL becomes bigger. This method, expected to give new knowledge in pipeline network applications, especially for the large diameter of pipelines.
Źródło:
Journal of Water and Land Development; 2020, 46; 1-9
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern concrete pipes: a review of reinforcement and new technologies
Autorzy:
Abel, Tomasz
Pelczar, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/2037701.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
concrete pipe
underground structure
fibre
reinforcement
Opis:
The paper discusses existing reinforcement, future reinforcement and new technologies for concrete pipes used in the sewage systems. Concrete pipes currently in use and under investigation are reviewed. Structural fibres, as the main reinforcement of concrete pipes, are known as an attractive alternative to the traditional steel bars. Steel, synthetic and basalt fibres have been considered. The latest research and mechanical properties of individual fibres are presented. Advances in fibre-reinforced concrete provide a new basis for the design of more efficient concrete pipes, especially those resistant to biological corrosion and with a longer service life. In the article, future non-corrosive reinforcement due to the reduction of steel reinforcement and corrosion protection linings has been proposed.
Źródło:
Studia Geotechnica et Mechanica; 2021, 43, s1; 548-557
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Budownictwo organowe na Słowacji po roku 2000
Organ-building in Slovakia after 2000
Autorzy:
Adamko, Rastislav
Powiązania:
https://bibliotekanauki.pl/articles/24020104.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Opolski. Diecezjalny Instytut Muzyki Kościelnej. Katedra Muzykologii Uniwersytetu Opolskiego
Tematy:
Słowacja
organy piszczałkowe
organmistrz
traktura
wiatrownica
Slovakia
Pipe Organ
Organ-builde
Windchest
Action
Opis:
A total of 60 organs were built in Slovakia after 2000, including 10 positives, 13 smaller one-manual instruments, 30 two-manual instruments, 6 three-manual instruments and one four-manual instrument. In addition to Slovak and Czech organ-builders, other foreign companies became contractors for these installations, and brought a new level of quality, as they followed the most modern trends in organ-building to a much greater extent. Some Slovak companies have also moved in this direction. However, anachronistic approaches can also be noted, especially among the older generation of Slovak organ builders. The tonal concept of many new instruments is aimed at creating versatility. In recent years, however, there has been an emerging trend to create stylistically distinct dispositions.
Źródło:
Folia Organologica. International yearbook of organ and organ music; 2023, 1; 7-21
2657-6082
2719-3284
Pojawia się w:
Folia Organologica. International yearbook of organ and organ music
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of leakage influence within capillary heat pipe recuperative heat exchanger
Autorzy:
Adamovsky, D.
Neuberger, P.
Adamovsky, R.
Powiązania:
https://bibliotekanauki.pl/articles/62628.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Opis:
The paper analyses the leakage of air-to-air recovery heat exchanger consisting of 100 capillary thermal tubes 1.5 m long and aligned in ten rows. The operation of the recovery exchanger prototype was tested in a pigsty. The analysis focuses on how the exchanger leakage affects the heat utilisation efficiency of the air ducted from the pigsty, changes in supply/exhaust air flow rate ratio, supply air temperature, thermal output obtained, and exchanger’s total thermal and mass balances. The results obtained in in-process measurements and the mass and thermal balances show that the exchange leakage causes the outside supply air to contain 12.1–37.3% of the pigsty exhaust air. The percentage of the pigsty air increases with the increase of mass flow rates of supply and exhaust air. This leakage resulted particularly in a major change in supply and exhaust air mass flow rates, higher moisture content, temperature and thermal flow of the air conducted in the pigsty. The change in air flow rates resulted in ventilation change so that the overpressure ventilation took place instead of balanced ventilation. This change led to increased thermal losses by air penetrating through leaks in the peripheral building structures. Increased supply air moisture content made it necessary to increase ventilation intensity in order to meet the required pigsty air parameters with respect of animal wellbeing and protection of peripheral building structures against dampness deterioration. The thermal flow increase of the air conducted in the pigsty due to the high enthalpy of the pigsty air mixed resulted in the higher secondary heat utilisation efficiency. The actual efficiency, however, was considerably lower. The differences of 2.7 – 14.5% between the exchanger’s measured and actual thermal efficiency according to relation (16) and those of 18.7 – 55.8% between the exchanger’s measured and actual running efficiency (13) increase as the ratio of supply and exhaust air mass flow rates increase.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2007, 3
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of the effects of the secondary heat recovery from ventilation air in an animal house for the fattening of broiler chickens
Autorzy:
Adamovsky, R.
Adamovsky, D.
Kara, J.
Neuberger, P.
Powiązania:
https://bibliotekanauki.pl/articles/61735.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
verification
secondary heat recovery
ventilation
air
animal house
fattening
broiler chicken
heat exchanger
gravitation thermal pipe
exchanger efficiency
thermal balance
specific energy consumption
energy consumption
heat recovery system
Opis:
This paper presents results of the verification of a heat exchanger composed of gravitation thermal pipes installed in a broiler chicken feeding facility. The objective of the study was to verify the possibility of the application of a power management system including a heat recovery system in a heavy-duty environment of a broiler chicken fattening facility and to specify effects of the system upon the specific consumption of energy for space heating and ventilation of the animal house. The calculation of the thermal balance of the animal house documents that the power management system that includes a heat recovery exchanger unit may reduce the thermal capacity of external sources of heat in the animal house by 26.5% even when subject to extreme conditions and at the atmospheric temperature of -12°C and the age of chickens being 1 day. The results of the metering and calculations of the efficiency have proven that the heat exchanger reaches the operational efficiency of 10–47% and thermal efficiency of 20–80% even during the most demanding operational first twenty days of the breeding cycle of broiler chickens. The specific consumption of energy for space heating and ventilation related to 1 kg of the live weight of chicken in the animal house facility A provided with a heat recovery exchanger unit at the average atmospheric temperature during the cycle being 4.3°C amounted to 278.5 Wh. In the animal house B as not provided with the heat recovery exchanger units hosting the same number of chickens and provided with the same process and thermal loss due heat transmission through peripheral structures being one half compared to the animal house A, the specific consumption of energy per 1 kg of the live weight of chicken was 420.5 Wh.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2008, 06
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Choice of rational diameters of pipelines for hydraulic system of city quarter water
Vybor racionalnykh diametrov truboprovodov gidravlicheskojj sistemy vodosnabzhenija gorodskogo kvartala
Autorzy:
Akimov, P.
Powiązania:
https://bibliotekanauki.pl/articles/793305.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
mathematical model
hydraulic characteristics
water supply system
rational parameter
pipeline
pipe diameter
integration
economic effect
water consumption
city area
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2013, 13, 4
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Novel Simple Technique for Measuring the Volumetric Flow Rate and Direction of Flow Inside a Pipe – The Single and Double Coils Sensors
Autorzy:
Al Jarrah, Asem Mohammad
Powiązania:
https://bibliotekanauki.pl/articles/2204044.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
volumetric flow rate sensor
flow sensor
flow direction detection
velocity measurement
high speed velocity measurement
single coil sensor
double coils sensor
Opis:
This work shows how a single coil wrapped on a pipe can be used to measure the volumetric flow rate inside the pipe and how by wrapping a second coil the flow direction can be detected. The developed method is very simple, accurate, and cover all the range of flow from low speed to high speed with more accuracy expected at high speed. Few turns are sufficient for the coils, no calibration is needed, and the method can be used for all kinds of nonmagnetic fluids even, with less accuracy, without the need to know the type of fluid inside the pipe. The principle of the developed method is theoretically explained and proved and then experimentally validated.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 5; 290--298
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
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:
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 investigations on concrete beams reinforced with equivalent service steel pipe
Autorzy:
Al-Yassri, Labeeb S.
Al-Ramahee, Munaf A.
Al-Khekani, Alaa M.
Powiązania:
https://bibliotekanauki.pl/articles/35525019.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
duct
flexural
opening
steel pipe
reinforced concrete beam
Opis:
Different techniques were employed for the passage of different utilities through structural elements. The reduction of the overall building weight was the main concern that needs to be achieved, especially for a multistory building. It can be done with the eliminating of a suspended ceiling with a portion of the beam’s weight by taking the advantages of the hollow sections. In this study, an equivalent reinforcement to the traditional ribbed reinforcement was employed to fabricate a reinforced concrete (RC) beam with a hollow section along the length of the beam. A steel pipe was used based on the equivalent moment from section analysis. Two diameters were selected of steel pipes as an equivalent to the commercial reinforcement. A total of four RC beams were cast and tested, two of them with traditional reinforcement and the other with steel pipe reinforcement. The comparison showed a promising result in terms of ductility, cracking pattern, ultimate strength, and mode of failure compared to the reference beam. The peak loads for the specimens with steel pipe were 160.6 kN and 184 kN, while they were 192 kN and 203.5 kN for the beams with traditional reinforcement.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 1; 16-28
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solid particle erosion in the sudden contraction of raw water pipeline
Autorzy:
Amori, Karima E.
Al-Salmany, Zaid
Powiązania:
https://bibliotekanauki.pl/articles/2096180.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
erosion
solid particle
CFD
model calculations
pipe contraction
erozja
cząstki stałe
model obliczeniowy
Opis:
The steady 3-D raw water turbulent flow is numerically investigated. This flow is formed of solid silica sand (quartz) carried by water in stainless steel pipe. The flow in a straight pipe and flow in a pipe with a sudden contraction are analyzed using a two-way coupled Eulerian-Lagrangian approach. Erosion rate is estimated by Oka erosion model combined with the constant coefficient of restitution. The effect of solid particles mass flow rate, inlet velocity, particle diameter, internal pipe diameter, orientation, contraction coefficient, and wall pipe contraction angle on erosion rate are examined. The predicted erosion is distributed homogenously for straight pipe, while the step wall area of the contraction is the most eroded part. The erosion rate increases with the increase of solid particles diameter, flow rate, inlet velocity, and decreasing pipe diameter. Iit is found that the erosion is limited till the particle diameter reaches 500 µm then it starts to increase. The erosion rate increases with decreasing contraction coefficient and step wall angle. When the step wall angle decreased to 300, the erosion rate is reduced by 30 times that for 900. So, decreasing step wall angle can be considered as a geometrical solution to reduce erosion rate.
Źródło:
Diagnostyka; 2022, 23, 1; 1--13
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The performance of H2O, R134a, SES36, ethanol, and HFE7100 two-phase closed thermosyphons for varying operating parameters and geometry
Autorzy:
Andrzejczyk, R.
Muszyński, T.
Powiązania:
https://bibliotekanauki.pl/articles/240401.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
two-phase closed thermosiphon
heat pipe
energy efficiency
NTU
number of heat transfer units
heat recovery
zamknięty termosyfon dwufazowy
rura cieplna
efektywność energetyczna
liczba jednostek przepływu ciepła
odzysk ciepła
Opis:
In this study, the influences of different parameters at performance two-phase closed thermosiphon (TPCT) was presented. It has been confirmed that the working fluid, as well as operating parameters and fill ratio, are very important factors in the performance of TPCT. The article shows characteristics of gravitational tube geometries, as well as the technical characteristic of the most important system components, i.e., the evaporator/condenser. The experiment’s plan and the results of it for the two-phase thermosiphon for both evaluated geometries with varying thermal and fluid flow parameters are presented. Experiments were performed for the most perspective working fluids, namely: water, R134a, SES36, ethanol and HFE7100. Obtained research proves the possibility to use TPCT for heat recovery from the industrial waste water.
Źródło:
Archives of Thermodynamics; 2017, 38, 3; 3-21
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of Baffle Factor for Straight Pipe Flow
Autorzy:
Artichowicz, W.
Łuczkiewicz, A.
Sawicki, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/240988.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
disinfection chamber
baffle factor
pipe flow
Opis:
The baffle factor is a parameter widely used to describe flow system characteristics. This indicator is very important in designing disinfection devices. For example, it is used to convert the plug flowtime to the actual fluid residence time in the flowsystem of interest. Its accurate determination is a complex problem requiring tracer experiments or computational fluid dynamics simulations. Therefore, in practice, it is often taken from tables provided in the literature. The literature sources, however, state that the baffle factor for a flow in a straight pipe is equal to unity, which implies the identity between the pipe flow model and the plug flow model. This assumption is doubtful. The aim of the present work is to verify the baffle factor values assumed for the pipe flow. The merit of this study is the analytical derivation of the expression describing the baffle factor value with respect to flow characteristics. To this purpose, the analytical solution of a one-dimensional advection-diffusion equation with a Heaviside initial condition was used. It was demonstrated that the aforementioned assumption is wrong, as the baffle factor for a straight pipe is significantly less than unity.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2018, 65, 1; 31-39
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza konstrukcyjna stref zgrzania rur płuczkowych
Design analysis of welding zones of casing pipes
Autorzy:
Artymiuk, J.
Bednarz, S.
Kiełbik, W.
Powiązania:
https://bibliotekanauki.pl/articles/300011.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
wiercenie
rury płuczkowe
strefa zgrzania rur
awarie urwania przewodu wiertniczego
drilling
mud pipes
zone of pipe welding
torn string
Opis:
Przy prowadzeniu wiercenia otworu Odrowążek 1 znajdującego się w północnej części Gór Świętokrzyskich wystąpiło dziewięć urwań przewodu wiertniczego. Były to powtarzające się i podobne urwania tak ze względu na ich charakter jak i strefę występowania. Elementy urwanego przewodu poddano analizie konstrukcyjnej, badaniom nieniszczącym, badaniom materiałowym oraz analizie wytrzymałościowej. W artykule przedstawiono wyniki analizy konstrukcyjnej.
During drilling operations in the well Odrowążek 1 in the north part of the Świętokrzyskie Mountains nine instances of string breaking took place. They were recurrent, similar in character and place of occurrence. The elements of the broken string were analyzed for their construction, non-invasive analyses, material tests and strength analysis. The results of the construction analysis are presented in the paper.
Źródło:
Wiertnictwo, Nafta, Gaz; 2008, 25, 2; 177-183
1507-0042
Pojawia się w:
Wiertnictwo, Nafta, Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 465

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