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    Wyświetlanie 1-4 z 4
    Tytuł:
    Thermodynamic analysis of combined ORC-VCR system with recuperator and reheater
    Autorzy:
    Rawat, Kamal Singh
    Bhandari, Prabhakar
    Bisht, Vijay Singh
    Powiązania:
    https://bibliotekanauki.pl/articles/2142837.pdf
    Data publikacji:
    2022
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    low grade energy
    organic Rankine cycle
    refrigeration
    hydrocarbons
    recuperator
    reheaters
    energia
    ORC
    organiczny obieg Rankine'a
    chłodzenie
    węglowodory
    rekuperator
    nagrzewnica
    Opis:
    The trend of utilization of low-grade thermal energy gain huge attention due to increase in energy demand and depletion of conventional resources of energy. Low grade energy can be used in ORC-VCR cycle for refrigeration purpose. In the present work, to improve the performance a modified ORC-VCR cycle, recuperator and reheater are integrated in the cycle. The thermodynamic analysis of the modified system has been conducted with R600a, R600, R290 and R1270 as working fluids under various operating conditions viz. evaporator temperature, condenser temperature, boiler exit temperature. Different parameters evaluated to assess the performance are overall COP, mass flow rate per kW cooling capacity, expansion ratio and compression ratio. From the analysis, butane is found as a best choice for the modified ORC–VCR cycle. It was found that for the modified ORC-VCR cycle at boiler exit temperature of 90°C and condenser temperature 40°C has system COP of 0.5542 with butane, which is 7.1% and 18% higher than that of ORC-VCR cycle with recuperator and simple ORC-VCR cycle, respectively.
    Źródło:
    Acta Innovations; 2022, 44; 34-44
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of D-shaped, reverse D-shaped and U-shaped turbulators in solar air heater on thermo-hydraulic performance
    Autorzy:
    Ghildyal, Abhishek
    Bisht, Vijay Singh
    Bhandari, Prabhakar
    Rawat, Kamal Singh
    Powiązania:
    https://bibliotekanauki.pl/articles/27312225.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    CFD
    renewable energy
    solar air heater
    turbulence kinetic energy
    thermo-hydraulic performance
    Opis:
    As the cost of fuel rises, designing efficient solar air heaters (SAH) becomes increasingly important. By artificially roughening the absorber plate, solar air heaters’ performance can be augmented. Turbulators in different forms like ribs, delta winglets, vortex generators, etc. have been introduced to create local wall turbulence or for vortex generation. In the present work, a numerical investigation on a solar air heater has been conducted to examine the effect of three distinct turbulators (namely D-shaped, reverse D- and U-shaped) on the SAH thermo-hydraulic performance. The simulation has been carried out using the computational fluid dynamics, an advanced and modern simulation technique for Reynolds numbers ranging from 4000 to 18000 (turbulent airflow). For the purpose of comparison, constant ratios of turbulator height/hydraulic diameter and pitch/turbulator height, of 0.021 and 14.28, respectively, were adopted for all SAH configurations. Furthermore, the fluid flow has also been analyzed using turbulence kinetic energy and velocity contours. It was observed that the U-shaped turbulator has the highest value of Nusselt number followed by D-shaped and reverse D-shaped turbulators. However, in terms of friction factor, the D-shaped configuration has the highest value followed by reverse D-shaped and U-shaped geometries. It can be concluded that among all SAH configurations considered, the U-shaped has outperformed in terms of thermohydraulic performance factor.
    Źródło:
    Archives of Thermodynamics; 2023, 44, 2; 3--20
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of car radiator using dimple roughness and nanofluid
    Autorzy:
    Thapa, Robin Kumar
    Bisht, Vijay Singh
    Bhandari, Prabhakar
    Rawat, Kamal Singh
    Powiązania:
    https://bibliotekanauki.pl/articles/2134933.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer
    augmentation
    nanofluid
    pumping power
    car radiator
    artificial roughness
    Opis:
    Thermal augmentation in flat tube of car radiator using different nanofluids has been performed more often, but use of artificial roughness has been seldom done. Artificial roughness in the form of dimple is used in the present research work. Present study shows the impact of dimple shaped roughness and nanofluid (Al2O3/pure water) on the performance of car radiator. The pitch of dimples is kept at 15 mm (constant) for all the studies performed. The Reynolds number of the flow is selected in the turbulent regime ranging from 9350 to 23 000 and the concentration of the nanofluid is taken in the range of 0.1–1%. It has been found that the heat transfer rate has improved significantly in dimpled radiator tube on the expense of pumping power. Furthermore, the heat transfer rate also increases with increase in nanoparticle concentration from 0.1% to 1.0%. The highest heat transfer enhancement of 79% is observed at Reynolds number 9350, while least enhancement of 18% is observed for Reynolds number of 23 000.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 3; 125--140
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Economic analysis of artificially roughened solar air heater with v-shaped ribs
    Autorzy:
    Bahuguna, Rahul
    Chamoli, Sunil
    Barthwal, Yogesh
    Rana, Sumit
    Gupta, Ashutosh
    Bisht, Vijay Singh
    Powiązania:
    https://bibliotekanauki.pl/articles/2142836.pdf
    Data publikacji:
    2022
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    solar air heater
    heat transfer
    artificial roughness
    economic analysis
    life cycle savings
    powietrzny kolektor słoneczny
    wymiana ciepła
    sztuczna chropowatość
    analiza ekonomiczna
    oszczędności w cyklu życia
    Opis:
    Due to the minimal transfer of heat from absorber plate to moving air in the duct, solar air heaters have low performance. One of the procedures to augment the heat transfer by substantial amount is by utilizing artificial roughness, by which the performance can be improved considerably. In this study, an economic investigation of solar air heater embedded with artificial roughness is accomplished numerically employing v-shaped roughness, with the objective of optimising life cycle solar savings. The non-dimensional parameters of roughness, namely, angle of attack (α), roughness pitch (p/e) and roughness height (e/Dh) are examined by varying temperature rise over the solar air heater (∆T) and solar radiations (I) for different economic parameters values i.e., cost of collector, cost of roughness elements, and cost of conventional fuel.
    Źródło:
    Acta Innovations; 2022, 44; 18-33
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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