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Wyświetlanie 1-15 z 87
Tytuł:
Analyzing temperature changes in the ground massif with a horizontal heat exchanger in the course of the heating season
Autorzy:
Adamovsky, R.
Neuberger, P.
Sed'ova, M.
Powiązania:
https://bibliotekanauki.pl/articles/62442.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
temperature change
ground massif
horizontal heat exchanger
heating season
heat pump
ground source heat pump
heat transfer
energy potential
ground temperature
temperature distribution
Opis:
The article is devoted to temperature changes in the ground massif with the horizontal heat exchanger as an energy source for a heat pump. The article was aimed at analyzing temperature changes in the ground massif with the horizontal heat exchanger at the beginning, in the course of and at the end of the heating season. Another aim was to analyze temperature differences in the area of the horizontal exchanger and the reference lot. The heat flow utilized in the evaporator of heat pump was extracted from the ground exchanger (nominal output at the condenser was 10.5 kW). Temperatures of the ground massif with the horizontal heat exchanger were measured in its plane in depths of 0.75 m, 0.5 m and 0.25 m. The temperature inside the ground massif on the reference lot and ambient parameters were measured as well. It is obvious that the difference of energetic potentials inside the ground massif with the heat exchanger and on the reference lot is insignificant at the beginning of the heating season. During the heating season, the difference of ground massif energetic potentials increases; at the end it is constant. The difference of temperatures in horizontal planes was not significant at the beginning of the heating season; however, it gradually increased. Maximum differences were detected in the area of the heat exchanger. In higher strata, the difference between temperatures decreases. During a major part of the heating season, temperatures at pipes of the ground exchanger were negative. This fact affected amounts of heat extracted from the ground massif.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2010, 11
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature changes in heat pump horizontal ground source
Autorzy:
Adamovsky, R.
Neuberger, P.
Sed'ova, M.
Powiązania:
https://bibliotekanauki.pl/articles/60337.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
temperature change
heat pump
ground massif
horizontal heat exchanger
heat potential
soil
thermal potential
heating period
ground temperature
temperature distribution
heat transfer
energy conservation
Opis:
The paper deals with assessment of thermal fields and temperature changes in ground massif with horizontal heat exchanger used as a heat source for a heat pump. Temperatures in the zone of the horizontal ground exchanger are compared with temperatures in a reference land. Changes of heat potential of the soil during the heating period are also assessed. Possibilities of recovery of thermal potential of the ground massif when utilizing vertical and horizontal exchangers are analyzed in the opening part of the paper. The results of the first verification indicated that average temperatures in the horizontal planes of the ground massif did not differ considerably with distance from the exchanger tube. Differences in average temperatures in reference and experimental lands confirmed sufficient heat potential of the ground massif even at the peak of the heating period. The differences in average temperatures reached up to 6.51 K in the end of the heating period while at the beginning of the heating period, the differences in average temperatures dropped to 1.35 K. The differences between maximum and minimum temperatures in the zone of the ground exchanger reached up to 1.9 K at the peak of the heating period and rose to 3.9 K at the beginning and end of the heating period. The first results of our measurements indicate the necessity of accumulation of thermal energy in the soil massif in the summer period like in case of the vertical exchangers.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2009, 07
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element analysis of the 3D thermal stress state in a brake disk
Autorzy:
Adamowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/281459.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
frictional heating
temperature
thermal stresses
pad-disk brake system
finite element method
Opis:
The quasi-static thermal stress state within the linear uncoupled elasticity is studied. The calculations were performed using the finite element method (MSC.Patran/MSC.Nastran). In order to examine smooth stress changes in a brake disk during braking, based on the temperature fields at particular time steps, additionally the script using Python programming language was developed. The numerical three-dimensional FE model of the brake disk for calculation of the transient temperature field was adopted from the previous author’s study. A single braking process at linear deceleration and constant contact pressure was simulated. The evolutions and the contours of the components of the stress tensor as well as the equivalent Huber-Mises stress were examined. The most important aspects of the stress state during braking were discussed.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 1; 205-218
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The TRIZ method in determining individual heating costs
Autorzy:
Adamski, Mariusz
Kapalo, Peter
Zhelykh, Vasyl
Voznyak, Orest
Dovbush, Oleksandr
Klymenko, Hanna
Kozydra, Natalia Olcha
Powiązania:
https://bibliotekanauki.pl/articles/2065614.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska
Tematy:
heating costs
technical contradiction
reversed technical contradiction
physical contradiction
temperature
koszty ogrzewania
sprzeczność techniczna
odwrócona sprzeczność techniczna
sprzeczność fizyczna
temperatura
Opis:
The assumptions used in the calculation methods for housing heating costs are described in this paper. The results of calculations are influenced by the values of coefficients related to the location of flats in a building. A technical contradiction, a reversed technical contradiction and a physical contradiction were formulated. Based on the indicated inventive principles, the calculation methods for individual heating costs were analysed.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2020, 9, 1; 127--134
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena efektu samopodgrzewania układu PLD w niskich temperaturach
Evaluation of self-heating of PLD structure in low temperatures
Autorzy:
Arnold, K.
Pająkowski, J.
Michalak, S.
Powiązania:
https://bibliotekanauki.pl/articles/156501.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
czas propagacji
niskie temperatury
samopodgrzewanie
PLD
propagation delay
low temperature
self-heating
Opis:
W pracy opisano zachowanie programowalnego układu PLD po poddaniu go działaniu niskich temperatur, obniżanych do temperatury ciekłego azotu. Przedstawiono wyniki badań eksperymentalnych, zmierzających do określenia wpływu temperatury i poboru mocy przez wykonaną w technologii CMOS strukturę EE PLD na czasy propagacji zintegrowanych bramek logicznych. Zaprezentowano charakterystyki średniego czasu propagacji pojedynczej bramki w zakresie niskich temperatur i porównano uzyskane wyniki z prognozami, formułowanymi w oparciu o zjawisko samopodgrzewania struktury półprzewodnikowej.
In this paper behavior of a programmable logic device (PLD) in the low temperature range, including temperature of liquid nitrogen, is presented. There are given the results of experiments in which we tried to determine the influence of temperature and power consumption on the propagation delay of integrated logic gates implemented in an EE PLD CMOS structure. The thermal conditions of work resulting from the ambient temperature, clock signal frequency, value of voltage supply and current consumption connected with output loads and switching frequency are discussed. The PLD device properties in the nominal range of ambient temperatures and expected behavior after reducing the temperature are described. The main idea of the circuit for average propagation delay measuring (Fig. 1) and the voltage-current dependence for recommended test output loads (Figs. 2 and 3) are discussed. The test circuit with pull-up resistors for increasing self-heating effect is proposed (Fig. 4). The results for the propagation delay (Fig. 5) and current consumption (Fig. 6) at 1 kHz and 1 MHz switching fre-quency as a function of the temperature changing from -196°C to 20°C are shown. The propagation delay vs. temperature (Figs. 7 and 8) and the current consumption vs. temperature (Fig. 9) for the circuit with external pull-up resistors are presented. The influence of voltage supply value changes on the obtained results is taken into consideration. The results are discussed and compared with expectations.
Źródło:
Pomiary Automatyka Kontrola; 2012, R. 58, nr 7, 7; 641-643
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of heat treatment on microhardness of electroless Ni-YSZ cermet coating
Autorzy:
Bahiyah Baba, N.
Ghazali, A. S.
Abdul Rahman, A. H.
Sharif, S.
Powiązania:
https://bibliotekanauki.pl/articles/2201036.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
Ni-YSZ
cermet
coating
microhardness
heating temperature
heating time
electroless nickel
powłoka
mikrotwardość
temperatura nagrzewania
czas nagrzewania
bezprądowe powlekanie niklem
Opis:
Purpose: The paper discussed the effect of heat treatment on electroless nickel-yttria-stabilised zirconia (Ni-YSZ) cermet coating. Ni-YSZ cermet coating has potential applications such as cutting tools, thermal barriers, solid oxide fuel anode, and various others. The compatibility of ceramic YSZ and metallic nickel in terms of the mechanical properties such as hardness by varying the heating temperature, time and ceramic particle size is highlighted. Design/methodology/approach: Ni-YSZ cermet coating was deposited onto a highspeed steel substrate using the electroless nickel co-deposition method. The temperature and time were varied in a range of 300-400°C and 1-2 hours, respectively. The microhardness measurements were carried out using a Vickers microhardness tester (Shimadzu) according to ISO 6507-4. The surface characterisation of the cermet coating was carried out using JOEL Scanning Electron Microscope (SEM) coupled with Energy Dispersive X-ray (EDX) JSM 7800F. The crystallographic structure of materials was analysed by X-ray diffraction (XRD) Bruker D8 Advance instrument. Findings: It was found that the microhardness of Ni-YSZ cermet coating with the ratio of 70:30, respectively, is directly proportional to the heating temperature and time. Heating the Ni-YSZ cermet coating at 300°C from room temperature (rtp) to 1 hour shows a 12% microhardness increment, while from 1 to 2 hours gives a 19% increment. Compared to heating at 350°C and 400°C, the increment is more significant at 33% and 49% for rtp to 1 hour and 8% and 16% for 1 to 2 hours, respectively. In addition, the effect of varying YSZ particle size in the Ni-YSZ cermet gave response differently for heating temperature and heating time. Research limitations/implications: The paper is only limited to the discussion of the heat treatment effect on Ni-YSZ cermet coating hardness property. The tribological effect will be in future work. Practical implications: The microhardness data may vary due to the Vickers microhardness force applied and the amount of ceramic particle incorporation and phosphorus content in the nickel matrix. Originality/value: The value of this work is the compatibility of the ceramic YSZ and metallic nickel matrix in terms of mechanical properties, such as hardness, upon heat treatment.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 113, 1; 5--12
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The problem of control of rod heating process with nonseparated conditions at intermediate moments of time
Autorzy:
Barseghyan, Vanya R.
Powiązania:
https://bibliotekanauki.pl/articles/1845513.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heating control
temperature
intermediate moments of time
nonseparated multipoint conditions
complete controllability
Opis:
The problem of control of rod heating process by changing the temperature along the rod whose ends are thermally insulated is considered. It is assumed that, along with the classical boundary conditions, nonseparated multipoint intermediate conditions are also given. Using the method of separation of variables and methods of the theory of control of finite-dimensional systems with multipoint intermediate conditions, a constructive approach is proposed to build the sought function of temperature control action. A necessary and sufficient condition is obtained, which the function of the distribution of the rod temperature must satisfy, so that under any feasible initial, nonseparated intermediate, and final conditions, the problem is completely controllable. As an application of the proposed approach, control action with given nonseparated conditions on the values of the rod temperature distribution function at the two intermediate moments of time is constructed.
Źródło:
Archives of Control Sciences; 2021, 31, 3; 481-493
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The problem of control of rod heating process with nonseparated conditions at intermediate moments of time
Autorzy:
Barseghyan, Vanya R.
Powiązania:
https://bibliotekanauki.pl/articles/1845524.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heating control
temperature
intermediate moments of time
nonseparated multipoint conditions
complete controllability
Opis:
The problem of control of rod heating process by changing the temperature along the rod whose ends are thermally insulated is considered. It is assumed that, along with the classical boundary conditions, nonseparated multipoint intermediate conditions are also given. Using the method of separation of variables and methods of the theory of control of finite-dimensional systems with multipoint intermediate conditions, a constructive approach is proposed to build the sought function of temperature control action. A necessary and sufficient condition is obtained, which the function of the distribution of the rod temperature must satisfy, so that under any feasible initial, nonseparated intermediate, and final conditions, the problem is completely controllable. As an application of the proposed approach, control action with given nonseparated conditions on the values of the rod temperature distribution function at the two intermediate moments of time is constructed.
Źródło:
Archives of Control Sciences; 2021, 31, 3; 481-493
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the heat insulation layer on the thermally stressed condition of the facade wall
Autorzy:
Basok, Borys
Davydenko, Borys
Koshlak, Hanna
Lysenko, Oksana
Powiązania:
https://bibliotekanauki.pl/articles/26079345.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
stres temperaturowy
betonowa ściana elewacyjna
system grzewczy
modelowanie numeryczne
warstwa termoizolacyjna
temperature stress
concrete facade wall
heating system
numerical modelling
heat-insulating layer
Opis:
The temperature-stress state of the concrete facade wall with a window opening, which is the external enclosing structure of the room with a steel heating device, was investigated by the method of numerical modeling. Estimated studies were performed for winter period when the heating system of the building is functioning. According to the results of solving the system of equations of thermal stress and equation of thermal conductivity, the temperature distribution over the wall volume and distribution of normal and tangential stresses were determined. Areas of the wall where these stresses are maximum were identified. The research was performed for cases of both, absence and presence of a heat-insulating layer on the outer surface of the facade wall. From comparison of the results obtained for these two options, it follows that the external thermal insulation coating not only helps to reduce dissipative heat loss through the facade wall, but also reduces the absolute values of stresses in the concrete wall arising resulting from temperature deformations. In some cases, the sign of stresses changes from stretching (wall without external insulation) to compressive (wall with insulation).
Źródło:
Production Engineering Archives; 2022, 28, 2; 123--131
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza pracy płytowego fundamentu grzewczego
Work analysis of the plate heating foundation
Autorzy:
Belok, J
Wilk-Słomka, B
Powiązania:
https://bibliotekanauki.pl/articles/362697.pdf
Data publikacji:
2011
Wydawca:
Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:
płytowy fundament grzewczy
powietrzne ogrzewanie podłogowe
ESP-r
prąd dwutaryfowy
idealny rozkład temperatury w pomieszczeniu
plate heating foundation
air floor heating
current tariff level
ideal temperature distribution
Opis:
W artykule przeanalizowano możliwości zastosowania płytowego fundamentu grzewczego z powietrznym ogrzewaniem podłogowym [5] w budynku jednorodzinnym. Rozpatrywano warianty zapewniające uzyskanie komfortu cieplnego, projektowej temperatury powietrza w pomieszczeniu, obliczeniowego zapotrzebowania na ciepło dla budynku, przy zastosowaniu do ogrzewania pomieszczenia nagrzewnicy elektrycznej oraz zadanej grubości fundamentu.
In the article possibilities of using the plate heating foundation with the air floor heating [5] at the single-family building were analysed. Variants guaranteeing obtaining thermal comfort, design air temperature in the room, computational demand for the heating of building, at applying the electric and set stove for heating air up thicknesses of the foundation were being considered.
Źródło:
Fizyka Budowli w Teorii i Praktyce; 2011, T. 6, nr 4, 4; 9-14
1734-4891
Pojawia się w:
Fizyka Budowli w Teorii i Praktyce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Heat Engineering Parameters of Casting and Rolling Complexes Work
Autorzy:
Biryukov, A.
Ivanova, A.
Powiązania:
https://bibliotekanauki.pl/articles/381410.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous casting
casting-rolling machine
ingot heating device
temperature field
heat flux
odlewanie ciągłe
urządzenie grzewcze
pole temperatury
strumień ciepła
Opis:
The paper consists the problem of developing a scientific toolkit allowing to predict the thermal state of the ingot during its formation in all elements of the casting and rolling complex, between the crystallizer of the continuous casting machine and exit from the furnace. As the toolkit for the decision making task the predictive mathematical model of the ingot temperature field is proposed. Displacement between the various elements of the CRC is accounted for by changing the boundary conditions. Mass-average enthalpy is proposed as a characteristic of ingot cross-section temperature state. The next methods of solving a number of important problems with the use of medium mass enthalpy are developed: determination of the necessary heat capacity of ingots after the continuous casting machine for direct rolling without heating; determination of the rational time of alignment of the temperature field of ingots having sufficient heat capacity for rolling after casting; determination of the total amount of heat (heat capacity) required to supply the metal for heating ingots that have insufficient amount of internal heat.
Źródło:
Archives of Foundry Engineering; 2019, 3; 11-14
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Initial Charge Temperature and Furnace Exploitation on Steel Loss
Autorzy:
Boryca, Jarosław
Wyleciał, Tomasz
Urbaniak, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/2048863.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heating of steel charge
loss of steel
initial charge temperature
furnace exploitation
Opis:
Steel loss related to the formation of scale is a parameter that is of great importance in the charge heating process. The value of steel loss determined by the thickness of the scale layer affects the intensity of the heat transfer process in the heating furnace, but also constitutes a significant element in the heat-material balance. Reducing the loss of steel during charge heating has a positive effect on heat consumption and material losses, which is extremely important in the context of energy and resource savings, the main elements of sustainable development processes. The methodology of determining the loss of steel to scale in an industrial heating furnace is presented in the paper. The results of calculations for various charge temperatures at the entrance to the furnace are presented. The influence of furnace operating conditions on steel loss is discussed.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 289-291
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low temperature district heating using waste heat from biogas plant
Autorzy:
Cenian, A.
Noch, T.
Powiązania:
https://bibliotekanauki.pl/articles/1190191.pdf
Data publikacji:
2019
Wydawca:
Gdańska Szkoła Wyższa
Tematy:
low-temperature district-heating network
biogas installation
co-generation
energy efficiency
Opis:
A biogas plant can be a source of waste-heat flows with different thermal parameters. Application of such flows in local, low-temperature district-heating networks is a very attractive option for highly efficient, energetically and economically, co-generation systems applying biogas as the primary energy source.
Źródło:
Eco-Energetics: technologies, environment, law and economy; 2019, 2; 19--28
2657-5922
2657-7674
Pojawia się w:
Eco-Energetics: technologies, environment, law and economy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effektivnost' infrakrasnykh vodjanykh otopitel'nykh panelejj
Water efficiency infrared heating panels
Autorzy:
Cherednik, A.
Redko, A.
Powiązania:
https://bibliotekanauki.pl/articles/76786.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
water management
radiant heating
flux density
air temperature
heat flow
experimental study
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 6
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technika pomiarów temperatury procesów szybkozmiennych
Measuring technique of temperature of fast-changeable processes
Autorzy:
Chochowski, A.
Piotrowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/291612.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
termoelement
charakterystyka nagrzewania
temperatura
pomiar
thermocouple
heating characteristics
temperature
measurement
Opis:
Podczas prowadzonych badań wymiany ciepła, zwłaszcza w procesach szybkozmiennych, zwrócono uwagę na niejednoznaczność otrzymywanych wyników pomiaru temperatury. Przeprowadzono serię eksperymentów związaną z różnym sposobem mocowania czujników pomiarowych (termoelementów) mających na celu ustalenie prawidłowej techniki pomiaru. Rezultatem tych badan jest ustalenie prawidłowego sposobu mocowania końcówki termoelementu do obiektu, zapewniającego rzeczywisty pomiar temperatury i powtarzalność wynik d1a tych samych parametrów termicznych.
During investigation of temperature changes of in fast-changeable processes the obtainerd results were ambiguous. The temperature values depended on the way the thermocouple was fixed. The following experiments pointed out which technique should be applied in order to obtain the right results. The right way is to fasten the tip of the thermocouple flat in order to provide the contact of thermocouple with the measuring surface at its final end.
Źródło:
Inżynieria Rolnicza; 2005, R. 9, nr 10, 10; 41-47
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 87

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