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1
Content available Air bottoming combined cycle performance analyses by the combined effect of variable parameters
Khan Mohammad N, Alzafiri Dhare
Archive of Mechanical Engineering
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2022
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LXIX, nr 3
497--517
EN
To meet the continuous demand for energy of industrial as well as commercial sectors, researchers focus on increasing the power generating capacity of gas turbine power plants. In this regard, the combined cycle is a better solution in terms of environmental aspects and power generation as compared to a simple gas turbine power plant. The present study is the thermodynamic investigation of five possible air bottoming combined cycles in which the topping cycle is a simple gas turbine cycle, regenerative gas turbine cycle, inter-cool gas turbine cycle, reheat gas turbine cycle, and intercool-reheat gas turbine cycle. The effect of pressure ratio of the topping cycle, the turbine inlet temperature of topping cycle, and ambient temperature on net power output, thermal efficiency, total exergy destruction, and exergetic efficiency of the combined cycle have been analyzed. The ratio of the net power output of the combined cycle to that of the topping cycle is maximal in the case when the topping cycle is a simple gas turbine cycle. The ratio of net power output and the total exergy destruction of the combined cycle to those of the topping cycle decrease with pressure ratio for all the combinations under study except for the case when the topping cycle is the regenerative gas turbine cycle.
2
Sprawność przeponowych wymienników ciepła
Rubik Marian
Ciepłownictwo, Ogrzewnictwo, Wentylacja
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2020
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T. 54, nr 10
9--14
PL
W artykule omówiono różne pojęcia sprawności przeponowych wymienników ciepła: sprawność cieplną, entropową i egzergetyczną. Opisano specyficzne cechy każdej ze sprawności oraz ich zastosowania w praktyce, a szczególnie do oceny efektywności energetycznej procesów intensyfikacji wymiany ciepła w wymiennikach.
EN
The article discusses various concepts of efficiency of diaphragm heat exchangers; thermal, entropic, and exegetic efficiency. The specific features of each efficiency are described, as well as their application in practice, especially for the assessment of energy efficiency regarding the processes of intensifying heat exchange in the exchangers.
3
Content available Exergy based analysis of solar air heater duct with W-shaped rib roughness on the absorber plate
Patel Sumer Singh, Lanjewar Atul
Archives of Thermodynamics
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2019
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Vol. 40, no 4
21--48
EN
Exergy analysis is a powerful thermodynamic tool and it helps in computing the actual output of a system. It helps the researchers to optimize the roughened solar air heater design to compensate the present and also the future needs. In this study, investigation on exergetic performance evaluation of a solar air heater with W-shaped roughened absorber surface analytically by employing mathematical model and the results obtained are compared with smooth plate solar air heater under same operating conditions. The exergetic efficiency curves has been plotted as a function of different values of Reynolds number and temperature rise parameter for different roughness parameters. The maximum augmentation in the exergetic efficiency of the solar air heater with W-shaped roughened surface as compared to solar air heater with smooth surface has been obtained as 51% corresponding to the relative roughness height of 0.03375 and the rib angle of attack about 60°. Based on the exergetic efficiency the suitable design parameters of solar air heater with W-shaped roughened are determined.
4
Content available remote Eksergetichna efektivnihst' central'nikh kondicihonerihv
Labajj V., Ihvanukh T.
Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska
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2000
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z. 32[180], cz.2
229-235
PL
Przedstawiono metodykę analizy egzergetycznej centrali klimatyzacyjnych. Zamieszczono jej wyniki i wnioski z niej wypływające.
EN
Methodics of exergetic analysis of the air conditioning systems is considered. It was defined that the system with I and II recirculations has highest exergetic efficiency rate in comparison with the system without recirculations and the system having I recirculation.
5
Content available remote Eksergetichna efektivnihst' avtonomnikh mihscebikh kondicihonerihv "Sanyo"
Labajj V., Dubihzhans'kijj D., Labajj O.
Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska
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2000
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z. 32[180], cz.2
221-227
PL
W referacie podano metodykę analizy egzergetycznej agregatów chłodniczych autonomicznych klimatyzatorów miejscowych. Otrzymany współczynnik egzergetyczny dla split-klimatyzatora "Sanyo" ze standardową wydajnością chłodniczą Q=2020 W. Przedstawiono egzergetyczny diagram strumieni agregatu chłodniczego tego klimatyzatora.
EN
It was described the method of the exergetic analysis of one-step freon cooling engines, that are used in the local autonomous air conditioners. It was defined the exergetic output-input ratio of the "split" air conditioner of firm "SANYO" with cooling capacity Q=2020 W for standard conditions and shown diagram of exergetic streams of this cooling engine.
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