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Wyszukujesz frazę "temperatury" wg kryterium: Temat

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Thermovision determination of the furnace chamber environment temperature using the technical black-body model
    Autorzy:
    Musiał, D.
    Wyczółkowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/239977.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ciało czarne
    pomiar temperatury
    termowizja
    black body
    temperature measurements
    thermovision
    Opis:
    The article describes the methodology for the determination of ambient temperature for thermovision measurements. The adopted methodology consists in the use of the technical blackbody model. Determining the value of the ambient temperature parameter makes it possible to enhance the accuracy of temperature measurement of objects exposed to strong irradiation using a thermovision camera.
    Źródło:
    Archives of Thermodynamics; 2010, 31, 4; 25-35
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of transient fluid temperature using the inverse method
    Autorzy:
    Jaremkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240590.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    temperature measurement
    transient conditions
    uncertainty analysis
    pomiar temperatury
    warunki przejściowe
    analiza niepewności
    Opis:
    This paper proposes an inverse method to obtain accurate measurements of the transient temperature of fluid. A method for unit step and linear rise of temperature is presented. For this purpose, the thermometer housing is modelled as a full cylindrical element (with no inner hole), divided into four control volumes. Using the control volume method, the heat balance equations can be written for each of the nodes for each of the control volumes. Thus, for a known temperature in the middle of the cylindrical element, the distribution of temperature in three nodes and heat flux at the outer surface were obtained. For a known value of the heat transfer coefficient the temperature of the fluid can be calculated using the boundary condition. Additionally, results of experimental research are presented. The research was carried out during the start-up of an experimental installation, which comprises: a steam generator unit, an installation for boiler feed water treatment, a tray-type deaerator, a blow down flashvessel for heat recovery, a steam pressure reduction station, a boiler control system and a steam header made of martensitic high alloy P91 steel. Based on temperature measurements made in the steam header using the inverse method, accurate measurements of the transient temperature of the steam were obtained. The results of the calculations are compared with the real temperature of the steam, which can be determined for a known pressure and enthalpy.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 1; 61-76
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydraulic resistance analyses of selected elements of the prototype Stirling engine
    Autorzy:
    Furmanek, Mariusz
    Kropiwnicki, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/240642.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Stirling engines
    temperature distribution
    hydraulic resistance
    silniki Sterlinga
    rozkład temperatury
    oporność hydrauliczna
    Opis:
    The paper presents the results of simulation tests of hydraulic resistance and temperature distribution of the prototype Stirling alpha engine supplied with waste heat. The following elements were analyzed: heater, regenerator and cooler. The engine uses compressed air as a working gas. Analyses were carried out for three working pressure values and different engine speeds. The work was carried out in order to optimize the configuration of the engine due to the minimization of hydraulic resistance, while maintaining the required thermal capacity of the device. Preliminary tests carried out on the real object allowed to determine boundary and initial conditions for simulation purposes. The simulation assumes that there is no heat exchange between the regenerator and the environment. The solid model used in simulation tests includes the following elements: supply channel, heater, regenerator, cooler, discharge channel. Due to the symmetrical structure of the analyzed elements, simulation tests were carried out using 1/6 of the volume of the system.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 3; 123-136
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilisation of bleed steam heat to increase the upper heat source temperature in low-temperature ORC
    Autorzy:
    Mikielewicz, D.
    Mikielewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240701.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    utylizacja
    zwiększenie górnej temperatury
    bleed steam utilisation
    increase of upper source temperature
    ORC
    Opis:
    In the paper presented is a novel concept to utilize the heat from the turbine bleed to improve the quality of working fluid vapour in the bottoming organic Rankine cycle (ORC). That is a completely novel solution in the literature, which contributes to the increase of ORC efficiency and the overall efficiency of the combined system of the power plant and ORC plant. Calculations have been accomplished for the case when available is a flow rate of low enthalpy hot water at a temperature of 90 [degrees]C, which is used for preliminary heating of the working fluid. That hot water is obtained as a result of conversion of exhaust gases in the power plant to the energy of hot water. Then the working fluid is further heated by the bleed steam to reach 120 [degrees]C. Such vapour is subsequently directed to the turbine. In the paper 5 possible working fluids were examined, namely R134a, MM, MDM, toluene and ethanol. Only under conditions of 120 [degrees]C/40 [degrees]C the silicone oil MM showed the best performance, in all other cases the ethanol proved to be best performing fluid of all. Results are compared with the "stand alone" ORC module showing its superiority.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 3; 57-70
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on transport packages used for food freshness preservation based on thermal analysis
    Autorzy:
    Yu, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/240937.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer theory
    logistics transportation
    Ansys Flotran
    temperature distribution
    teoria przenikania ciepła
    logistyka transportowa
    ANSYS Flotran
    rozkład temperatury
    Opis:
    In recent time, as the Chinese consumption level increases, the consumption quantity of high-value fruits, vegetables and seafood products have been increasing year by year. As a consequence, the traffic volume of refrigerated products also increases yearly and the popularization degree of the cold-chain transportation enhances. A low-temperature environment should be guaranteed during transportation, thus there is about 40% of diesel oil should be consumed by the refrigerating system and the cold-chain transportation becomes very costly. This study aimed to explore methods that could reduce the cost of transport packages of refrigerated products. On the basis of the heat transfer theory and the fluid mechanics theory, the heat exchanging process of corrugated cases during the operation of refrigerating system was analyzed, the heat transfer process of corrugated cases and refrigerator van was theoretically analyzed and the heat balance equation of corrugated cases was constructed.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 4; 121-135
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of heat flux density and heat transfer coefficient
    Autorzy:
    Taler, D.
    Taler, J.
    Grądziel, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/240288.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pomiar temperatury
    strumień ciepła
    współczynnik przenikania ciepła
    zagadnienie odwrotne
    heat flux
    heat transfer coefficient
    inverse problem
    temperature measurement
    Opis:
    The paper presents the solution to a problem of determining the heat flux density and the heat transfer coefficient, on the basis of temperature measurement at three locations in the flat sensor, with the assumption that the heat conductivity of the sensor material is temperature dependent. Three different methods for determining the heat flux and heat transfer coefficient, with their practical applications, are presented. The uncertainties in the determined values are also estimated.
    Źródło:
    Archives of Thermodynamics; 2010, 31, 3; 3-18
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On line diagnostics and self-tuning method for the fluidized bed temperature controller
    Autorzy:
    Porzuczek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240482.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fluidized bed boiler
    bed temperature
    temperature control
    statistical process control
    kocioł fluidalny
    temperatura złoża
    regulacja temperatury
    statystyczne sterowanie procesem
    Opis:
    The paper presents the method of on-line diagnostics of the bed temperature controller for the fluidized bed boiler. Proposed solution is based on the methods of statistical process control. Detected decrease of the bed temperature control quality is used to activate the controller self-tuning procedure. The algorithm that provides optimal tuning of the bed temperature controller is also proposed. The results of experimental verification of the presented method is attached. Experimental studies were carried out using the 2 MW bubbling fluidized bed boiler.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 1; 31-46
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic study on complex parts of the sphere and ellipsoid of a nuclear explosive device
    Autorzy:
    Zhenzhi, G.
    Bin, H.
    Guilin, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/240319.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plutonium component
    thermodynamic analysis
    numerical simulation
    temperature field
    stress field
    składnik plutonu
    analiza termodynamiczna
    symulacja numeryczna
    pole temperatury
    pole naprężeń
    Opis:
    Because the heat release of plutonium material, the composite structure is heated and the stress and strain of the composite structure will increase, which will affect the thermodynamic properties of the structure. The thermodynamic analysis of complex structures, which are composed of concentric structures of plutonium, beryllium, tungsten, explosives, and steel, was carried out. The results showed that when the structure is spherical, the temperature is higher than that of the ellipsoid structure. Stress of the elliptical structure is greater than the spherical structure. This study showed that the more flat the shell is, the greater the stress concentration point occurs at the long axis, and the maximum stress occurs at the beryllium layer. These conclusions provide theoretical support for the plutonium composite component testing.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 4; 89-103
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inverse heat transfer problem in digital temperature control in plate fin and tube heat exchangers
    Autorzy:
    Taler, D.
    Sury, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240927.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    odwrotny przepływ ciepła
    regulacja temperatury
    wymiennik ciepła
    digital PID control
    heat exchanger
    inverse heat transfer problem
    model-based control
    temperature control
    Opis:
    The aim of the paper is a steady-state inverse heat transfer problem for plate-fin and tube heat exchangers. The objective of the process control is to adjust the number of fan revolutions per minute so that the water temperature at the heat exchanger outlet is equal to a preset value. Two control techniques were developed. The first is based on the presented mathematical model of the heat exchanger while the second is a digital proportional-integral-derivative (PID) control. The first procedure is very stable. The digital PID controller becomes unstable if the water volumetric flow rate changes significantly. The developed techniques were implemented in digital control system of the water exit temperature in a plate fin and tube heat exchanger. The measured exit temperature of the water was very close to the set value of the temperature if the first method was used. The experiments showed that the PID controller works also well but becomes frequently unstable.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 4; 17-32
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduction of dynamic error in measurements of transient fluid temperature
    Autorzy:
    Jaremkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240052.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analiza niepewności
    model pierwszego obiektu
    pomiar temperatury
    stała czasowa
    warunki przejściowe
    first-order model
    temperature measurement
    time constant
    transient conditions
    uncertainty analysis
    Opis:
    Under steady-state conditions when fluid temperature is constant, temperature measurement can be accomplished with high degree of accuracy owing to the absence of damping and time lag. However, when fluid temperature varies rapidly, for example, during start-up, appreciable differences occur between the actual and measured fluid temperature. These differences occur because it takes time for heat to transfer through the heavy thermometer pocket to the thermocouple. In this paper, a method for determinig transient fluid temperature based on the first-order thermometer model is presented. Fluid temperature is determined using a thermometer, which is suddenly immersed into boiling water. Next, the time constant is defined as a function of fluid velocity for four sheated thermocouples with different diameters. To demonstrate the applicability of the presented method to actual data where air velocity varies, the temperature of air is estimated based on measurements carried out by three thermocouples with different outer diameters. Lastly, the time constant is presented as a function of fluid velocity and outer diameter of thermocouple.
    Źródło:
    Archives of Thermodynamics; 2011, 32, 4; 55-66
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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