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Wyszukujesz frazę "low grade energy" wg kryterium: Temat


Wyświetlanie 1-5 z 5
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:
Experience in modelling of a single-stage silica gel-water adsorption chiller
Autorzy:
Krzywański, J.
Szyc, M.
Nowak, W.
Kolenda, Z.
Powiązania:
https://bibliotekanauki.pl/articles/298154.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
low grade thermal energy
waste heat recovery
adsorption chillers
silica gel
coefficient of performance
cooling capacity
Opis:
Heat utilization for cooling capacity production is nowadays a desirable challenge in several industrial applications. There are lots of industrial processes with low parameters of heat generated as by-product, which utilization is very important to improve theirs total energy efficiency. Waste heat driven chillers seem to be great competitors for mechanical chillers. Among them special attention should be paid to adsorption chillers, since they can be powered with low – temperature heat sources. The paper presents a model of a single-stage adsorption chiller with silica gel as adsorbent and water, acting as a refrigerant. The performed model allows to predict the behaviour of the adsorption chiller, among others the main energy efficiency factors, such as coefficient of performance (COP) and cooling capacity (CC) for different working conditions.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(4); 367-386
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption chiller in a combined heating and cooling system: simulation and optimization by neural networks
Autorzy:
Krzywanski, Jarosław
Sztekler, Karol
Bugaj, Marcin
Kalawa, Wojciech
Grabowska, Karolina
Chaja, Patryk Robert
Sosnowski, Marcin
Nowak, Wojciech
Mika, Łukasz
Bykuć, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/2173577.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
adsorption heat pump
polygeneration
cooling capacity
low grade thermal energy
artificial neural networks
soft computing
absorpcyjna pompa ciepła
poligeneracja
wydajność chłodnicza
energia cieplna niskiej jakości
sztuczne sieci neuronowe
przetwarzanie miękkie
Opis:
Adsorption cooling and desalination technologies have recently received more attention. Adsorption chillers, using eco-friendly refrigerants, provide promising abilities for low-grade waste heat recovery and utilization, especially renewable and waste heat of the near ambient temperature. However, due to the low coefficient of performance (COP) and cooling capacity (CC) of the chillers, they have not been widely commercialized. Although operating in combined heating and cooling (HC) systems, adsorption chillers allow more efficient conversion and management of low-grade sources of thermal energy, their operation is still not sufficiently recognized, and the improvement of their performance is still a challenging task. The paper introduces an artificial intelligence (AI) approach for the optimization study of a two-bed adsorption chiller operating in an existing combined HC system, driven by low-temperature heat from cogeneration. Artificial neural networks are employed to develop a model that allows estimating the behavior of the chiller. Two crucial energy efficiency and performance indicators of the adsorption chiller, i.e., CC and the COP, are examined during the study for different operating sceneries and a wide range of operating conditions. Thus this work provides useful guidance for the operating conditions of the adsorption chiller integrated into the HC system. For the considered range of input parameters, the highest CC and COP are equal to 12.7 and 0.65 kW, respectively. The developed model, based on the neurocomputing approach, constitutes an easy-to-use and powerful optimization tool for the adsorption chiller operating in the complex HC system.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e137054
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption chiller in a combined heating and cooling system: simulation and optimization by neural networks
Autorzy:
Krzywanski, Jarosław
Sztekler, Karol
Bugaj, Marcin
Kalawa, Wojciech
Grabowska, Karolina
Chaja, Patryk Robert
Sosnowski, Marcin
Nowak, Wojciech
Mika, Łukasz
Bykuć, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/2128167.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
adsorption heat pump
polygeneration
cooling capacity
low grade thermal energy
artificial neural networks
soft computing
absorpcyjna pompa ciepła
poligeneracja
wydajność chłodnicza
energia cieplna niskiej jakości
sztuczne sieci neuronowe
przetwarzanie miękkie
Opis:
Adsorption cooling and desalination technologies have recently received more attention. Adsorption chillers, using eco-friendly refrigerants, provide promising abilities for low-grade waste heat recovery and utilization, especially renewable and waste heat of the near ambient temperature. However, due to the low coefficient of performance (COP) and cooling capacity (CC) of the chillers, they have not been widely commercialized. Although operating in combined heating and cooling (HC) systems, adsorption chillers allow more efficient conversion and management of low-grade sources of thermal energy, their operation is still not sufficiently recognized, and the improvement of their performance is still a challenging task. The paper introduces an artificial intelligence (AI) approach for the optimization study of a two-bed adsorption chiller operating in an existing combined HC system, driven by low-temperature heat from cogeneration. Artificial neural networks are employed to develop a model that allows estimating the behavior of the chiller. Two crucial energy efficiency and performance indicators of the adsorption chiller, i.e., CC and the COP, are examined during the study for different operating sceneries and a wide range of operating conditions. Thus this work provides useful guidance for the operating conditions of the adsorption chiller integrated into the HC system. For the considered range of input parameters, the highest CC and COP are equal to 12.7 and 0.65 kW, respectively. The developed model, based on the neurocomputing approach, constitutes an easy-to-use and powerful optimization tool for the adsorption chiller operating in the complex HC system.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e137054, 1--11
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Program rozwoju energetyki jądrowej w Polsce a zaopatrzenie w paliwa rozszczepialne z zasobów krajowych
Nuclear power development plans for Poland and uranium resources
Autorzy:
Strupczewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/282772.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
wydobycie uranu
ubogie rudy uranowe
bilans energetyczny wydobycia rudy ubogiej
błędy Storm van Leeuvena
zasoby uranu w Polsce
uranium mining
low grade uranium ore
energy balance for low grade uranium ore
errors of Storm van Leeuven
uranium resources in Poland
Opis:
W październiku 2007 r. Parlament Europejski przyjął uchwałę stwierdzającą, że energetyka jądrowa jest niezbędna dla Unii. Wiele krajów wznowiło swe programy energetyki jądrowej i przystępuje do budowy nowch elektrowni. Jednakże przeciwnicy energetyki jądrowej twierdzą, że w miarę wyczerpywania zasobów uranu energia potrzebna na uzyskanie uranu będzie szybko rosła, przekraczając energię, którą można uzyskać z rozszczepienia tego uranu w elektrowni jądrowej. W artykule rozpatrzono pełny bilans energetyczny dla górnictwa uranowego, obejmujący nie tylko energię potrzebną na wydobycie rudy i separację uranu, na odsalanie wody morskiej i jej dostarczenie do kopalni i okolicznych osiedli, ale także paliwo potrzebne do przewozu i kruszenia rudy, materiały wybuchowe, chemikalia na ługowanie uranu i energię na rekultywację kopalni po jej zamknięciu. Okazało się, że twierdzenia przeciwników są mylne. Nawet dla kopalni o najniższej zawartości uranu w rudzie, poniżej wskazanego przez przeciwników progu opłacalności energtycznej, energia uzyskiwana z rozszczepienia jest około 70 razy większa od całej energii na cały cykl paliwowy, od wydobycia uranu poprzez budowę elektrowni do jej zamknięcia i unieszkodliwiania odpadów radioaktywnych. Rudy o niskiej zawartości uranu można wykorzystywać. Jest to wniosek ważny dla Polski - nasze rudy ubogie i uran uzyskiwany jako produkt uboczny np. przy produkcji miedzi mogą zapewnić paliwo dla dużego programu rozwoju energetyki jądrowej w Polsce.
In October 2007 the European Parliament declared, that nuclear power is indispensable for the European Union. Many countries revive their nuclear power programs or start building new nuclear power plants. However, the opponents of nuclear power claim that as uranium resources get exhausted the energy needed to mine low grade uranium ore will be larger than the energy that can be obtained from fission in a nuclear power plant. The paper considers the total energy needs for uranium mining, including not only electricity needed for mining and milling, for water treatment and delivery to the mine and to the neighboring settlements, but also fuel for transportation and ore crushing, explosives for rock blasting, chemicals for uranium leaching and the energy needed for mine reclamation after completed ore exploitation. In contrast to the estimates of nuclear opponents based on mining experience with rich ores mined some 30 years ago, the study of IAE has used the most up to date data, reflecting the actual state-of-art mining practices. Since the opponents state clearly that the ore containing less than 0,013% U3O8 cannot yield positive energy balance, the paper considers mines of decreasing ore grade: Ranger 0.234% U, Rossing 0.028% U and Trekkopje 0.00126% U, that is with ore grade below the cut-off value postulated by opponents. The energy needed for very low grade uranium ore mining and milling increases but the overall energy balance of the nuclear fuel cycle remains strongly positive. Even for the mine using the poorest uranium ore the energy obtained at the NPP is about 70 times larger than that needed for the whole nuclear fuel cycle, including the energy needed for radioactive waste storage, the NPP construction and decommissioning to the green field status. The claims of nuclear opponents are shown to be wrong. Low grade uranium can be used. This also means that Polish uranium resources those in low grade ores and those obtained as a by-product of copper production, can provide fuel for a large program of nuclear power development in Poland.
Źródło:
Polityka Energetyczna; 2009, T. 12, z. 2/2; 565-576
1429-6675
Pojawia się w:
Polityka Energetyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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