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    Wyświetlanie 1-7 z 7
    Tytuł:
    Method of research for solar cookers performance characteristics- analysis and comparison
    Autorzy:
    Raghav, Geetanjali
    Sharma, Pankaj Kumar
    Kumar, Suresh
    Maithani, Rajesh
    Powiązania:
    https://bibliotekanauki.pl/articles/1833748.pdf
    Data publikacji:
    2021
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    solar cookers
    cooking
    plate temperature
    thermal performance
    kuchenka słoneczna
    gotowanie
    wydajność cieplna
    Opis:
    Cooking is one of the most common activity in day-to-day life of every woman. In rural areas the transportation of fuel is major problem and the increasing demand of energy for cooking applications is gaining importance and various investigations are being carried out for performance enhancement of the solar cooker. The box-type solar cooker has a complex thermal analysis due to the transient heat transfer phenomenon involved in three dimensions. A comparison of the standard correlation available are analysed for accuracy of predicted results with experimental data. The investigation involves the experimental determination of the parameters viz. wind heat transfer coefficient, side and bottom loss coefficient, inner and outer glass temperature. The extensive data is analysed with that of standard correlations and the significance of the experimental data is checked. Analysis found to have deviation of 3%-20% in experimental and correlation data, which indicates that for accuracy of performance analysis the studied parameters should be determined experimentally.
    Źródło:
    Acta Innovations; 2021, 39; 54--66
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of solar cooker with thermal storage for remote hilly areas: determination of heating and cooling characteristic time
    Autorzy:
    Raghav, Geetanjali
    Sharma, Pankaj Kumar
    Kumar, Suresh
    Maithani, Rajesh
    Iung, Alexis
    Quentin, Mercier
    Powiązania:
    https://bibliotekanauki.pl/articles/2142896.pdf
    Data publikacji:
    2021
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    solar energy
    solar cookers
    thermal storage
    thermal performance
    energia słoneczna
    kuchenka słoneczna
    magazynowanie ciepła
    wydajność cieplna
    Opis:
    Solar cooking finds a major application in rural areas of Uttarakhand, India, yet its utilization is still limited due to certain limitation such as intermittent nature of solar radiations. This drawback limits solar cooker in becoming a viable alternate solution of LPG and other pollution causing resources such as wood. In order to cater this problem a numerical analysis of box type solar cooker with storage is carried out. The energy stored in the storage material will keep the cooker warm up to the time when food is consumed. Charging and discharging time analysis is performed in with an aim to understand the effect of storage on solar cooker. Heating and cooling characteristic time are being evaluated and analysed with storage. Thermal performance of box type solar cooker is measured in terms of figures of merit according to BIS standards. The effect of storage has also been analysed in terms of charging and discharging time and first figure of merit of box type solar cooker.it has been observed that during discharging the heat is stored for more duration as compared to the charging time as discharge time is approx. 4-5 hours while charging time for the same amount of insolation is around 3-4 hours.
    Źródło:
    Acta Innovations; 2021, 40; 5-18
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparative study for double pass solar air collector utilizing medial glass panel
    Autorzy:
    Salih, Hussein M.
    Powiązania:
    https://bibliotekanauki.pl/articles/27309858.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    solar air collector
    double-pass
    CFD
    finite volume
    thermal performance
    kolektor powietrza słonecznego
    skończona objętość
    wydajność cieplna
    Opis:
    A numerical investigation of thermal prediction of double-pass solar air heater of-counter flow is developed in the present study. The main idea of the current study is that the collector consists of two layers of glass so that the middle layer is glass instead of the usual metal plate. The performance of double-pass solar air heater is studied for a wide range of solar radiation intensities (600, 750 and 900 W/m 2). A FORTRAN-90 program is built to simulate the mathematical model of double-pass solar air heater based on solving steady state two-dimensional Navier-Stokes equations and energy equation based on finite volume method. Turbulence effect is simulated by two equations k-ε module. The results are compared with the results of a previous experimental study and a good agreement was found. From compression calculating efficiency of the present and traditional collector for each solar intensity, it was found that the efficiency of the current collector is higher than that of the traditional one, where the efficiency of the current collector at the solar intensity of (600, 750 and 900) W/m 2 are (0.529, 0.514 and 0.503), respectively, while those of the traditional collector (0.508, 0.492 and 0.481), respectively. In addition to this, the effect of the mass flow rate on the temperature difference of the current proposed collector was studied. Three values of the mass flow rate were studied (0.009,0.018, and 0.027) kg/s at solar intensity of 750 W/m 2. From this it was found that the temperature difference decreases with increasing mass flow rate. Accordingly, the efficiency decreases
    Źródło:
    Archive of Mechanical Engineering; 2022, LXIX, 4; 729--747
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural convection and radiation in a radial porous fin with variable thermal conductivity
    Autorzy:
    Darvishi, M. T.
    Kani, F.
    Gorla, R. S. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/955178.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    konwekcja naturalna
    promieniowanie
    wydajność cieplna
    metoda kolokacji
    porous radial fin
    natural convection
    radiation
    thermal performance
    spectral collocation method
    Opis:
    In this study, the effects of radiation and convection heat transfer in a radial porous fin are considered. The geometry considered is that of a rectangular profile fin. The porous fin allows the flow to infiltrate through it and solid-fluid interaction takes place. This study is performed using Darcy’s model to formulate the heat transfer equation. The thermal conductivity is assumed to be a function of temperature. The effects of the natural convection parameter Nc , radiation parameter Nr and thermal conductivity parameter m on the dimensionless temperature distribution and heat transfer rate are discussed. The results suggest that the radiation transfers more heat than a similar model without radiation.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 1; 27-37
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal performance analysis of manned airships in a thermally variable environment
    Autorzy:
    Shi, Hong
    Liu, Meinan
    Chen, Jiamin
    Zou, Yitao
    Powiązania:
    https://bibliotekanauki.pl/articles/2173708.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    manned airship
    thermal performance
    nacelle
    temperature difference
    flight position
    sterowiec załogowy
    wydajność cieplna
    gondola
    różnica temperatur
    pozycja lotu
    Opis:
    The safety and reliability of the manned airship depend to a considerable extent on its thermal performance. In this paper, heat balance equations are developed and solved in the C++ programming language. The temperature variation of the enclosure, gasbag, and nacelles of the manned airship is investigated. In addition, the effects of season, latitude, and orientation on the thermal performance of the manned airship and the airship nacelle are investigated. The results show that: (1) The average temperature difference of the nacelle surface at the same time is 25 K, while the maximum temperature difference in the nacelle is 29 K during the day, (2) the temperature distribution in the nacelle is similar in spring and autumn, with maximum temperature between 306 K and 309 K. The maximum temperature in the nacelle is between 300 K and 303 K in winter while the maximum temperature in the nacelles is between 309 K and 315 K in summer, (3) as the flight position of the manned airship changes from 20°N to 60°N, the average nacelle temperature varies slightly by about 1 K. However, as the latitude increases, the high- temperature region shifts from the bottom of the nacelle to the side of the nacelle, and (4) the temperature distribution of the upper envelope of the airship varies considerably with orientation. However, the average temperature of the nacelle is less impacted by orientation. These results are useful for understanding the thermal performance of manned airships.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 5; art. no. e143105
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy-related conditions and envelope properties for sustainable buildings
    Autorzy:
    Geryło, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/201891.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sustainability of construction works
    requirements development
    primary energy
    embodied energy
    thermal performance
    thermal stability
    trwałość obiektów budowlanych
    rozwój wymagań
    energia pierwotna
    wydajność cieplna
    stabilność termiczna
    Opis:
    The assessment methodology for the sustainability of buildings is based on the analysis of environmental, social and economic performance. The main purpose of the paper is the presentation of energy-related conditions and envelope properties as well as methodology aspects. The first part of the paper presents the literature review on sustainability and zero-energy buildings. The second part is devoted to describe different energy indicators for the evaluation of primary energy requirements and energy characteristic. The last section describes the general methodology for characterization of energetic properties of the building envelope and gives examples from literature of the effect of applications in a building’s envelope an aerogel based thermal insulation for higher thermal transmittance and a PCM for higher latent heat capacity with general description of results obtained by other authors. The crucial measure is the use of high thermal performance components for the building’s envelopes combined with the heat storage potential. In the context of sustainability, energy related conditions constitute a new set of indicators for identifying the usefulness and the efficiency of new technologies.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 697-707
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method of calculation of air temperature in the open air layer
    Metoda obliczania temperatury powietrza w otwartej warstwie powietrznej
    Autorzy:
    Piotrowski, J.Z.
    Olenets, M.
    Starzomska, M.
    Zaborek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/402493.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    open air layer
    thermal performance
    mathematical model
    convective heat flux
    radiant heat flux
    heat transfer
    otwarta warstwa powietrzna
    wydajność cieplna
    model matematyczny
    konwekcyjny strumień ciepła
    radiacyjny strumień cieplny
    wymiana ciepła
    Opis:
    The building envelopes with the open air layer are common in building energy-efficient houses. In such buildings, air gap is used for moisture elimination from a surface of external wall, which improves its thermal properties. To improve the thermal quality of building envelopes with open air layer and reduce the heat transfer rate during the cold period, it is necessary to conduct more in-depth study of heat exchange in the ventilated layer of air. The article presents a mathematical model of heat transfer through building envelopes with an open air layer for the cold season. In the proposed mathematical model connective and radiant heat fluxes were considered separately.
    Źródło:
    Structure and Environment; 2012, 4, 4; 43-48
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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