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1
Content available Analiza termodynamiczna i ekonomiczna hierarchicznej, dwuobiegowej elektrowni jądrowej z regeneracją ciepła
Bartnik Ryszard
Nowa Energia
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2022
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nr 2
86--97
PL
W pracach [1-3] przedstawiono termodynamiczną i ekonomiczną analizę hierarchicznej elektrowni jądrowej z jednym, chłodzonym helem wysokotemperaturowym reaktorem HTGR. W pracy [4] zaprezentowano natomiast analizę elektrowni z dwoma takimi reaktorami. W niniejszej pracy ponownie przeanalizowano elektrownię z dwoma reaktorami HTGR, jednak w porównaniu z [4] z tą istotną różnicą, że w wysokotemperaturowym obiegu Joule’a zastosowano regenerację ciepła (rys. 1, 2), która znacząco zwiększa jego sprawność.
2
Content available Simulation of the efficiency of improved regenerative decentralised ventilators Vents Twin Fresh
Mileikovskyi Viktor, Vakulenko Daria
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
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2020
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Vol. 9 Nr 1
61--67
EN
The work is devoted to modelling Twin Fresh ventilator efficiency. The main aim is to simulate heat exchanged in a heat regenerator in variable conditions. The mathematical model is based on Navier-Stokes equations for laminar flow. The model is designed to achieve an adequate time for calculation and sufficient precision. The results show high efficiency of heat recovery in the order of 97.4%.
3
Content available Accuracy problem of modeling in a gas turbine cycle with heat regeneration according to Szewalski’s idea
Ziółkowski P., Piotrowski R., Badur J.
Transactions of the Institute of Fluid-Flow Machinery
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2015
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nr 129
77--109
EN
In this paper, authors undertook a problem of accuracy and exactness verification of some assumptions and calculation methods that are important in the 0D modeling. The computational flow mechanics (CFM) tools and basic calculations of gas turbine cycle with heat regeneration according to Szewalski’s idea have been done. Results and conclusions for this specific problem have been presented. Gas turbine cycle with heat regeneration according to Szewalski’s idea includes regeneration as same as it is now commonly employed in steam turbine cycles. Mentioned regeneration is enabled by adding to the simple cycle devices configuration of two regenerative heat exchangers and auxiliary compressor. That modification allows to obtain working medium circulation in closed cycle inside a basic cycle. Efficiency gain is dependent on extraction pressure and extraction mass flow rate.
4
Content available A study of transcritical carbon dioxide cycles with heat regeneration
Trela M., Kwidziński R., Butrymowicz D.
Archives of Thermodynamics
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2013
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Vol. 34, no. 3
197--217
EN
The paper presents an efficiency analysis of two transcritical CO2 power cycles with regenerative heaters. For the proposed cycles, calculations of thermal efficiency are given for selected values of operating parameters. It was assumed that the highest working temperature and pressure are in the range from 600 to 700°C and 40 to 50 MPa, respectively. The purpose of the calculations was optimization of the pressure and mass flows in the regenerative heaters to achieve maximum cycle efficiency. It follows that for the assumed upper CO2 parameters, efficiency of 51-54% can be reached, which is comparable to the efficiency of a supercritical advanced power cycle considered by Dostal.
5
Content available The influence of vapor superheating on the level of heat regeneration in a subcritical ORC coupled with gas power plant
Wiśniewski S., Borsukiewicz-Gozdur A.
Archives of Thermodynamics
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2010
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Vol. 31, no. 3
185-199
EN
The authors presented problems related to utilization of exhaust gases of the gas turbine unit for production of electricity in an Organic Rankine Cycle (ORC) power plant. The study shows that the thermal coupling of ORC cycle with a gas turbine unit improves the efficiency of the system. The undertaken analysis concerned four the so called "dry" organic fluids: benzene, cyclohexane, decane and toluene. The paper also presents the way how to improve thermal efficiency of Clausius-Rankine cycle in ORC power plant. This method depends on applying heat regeneration in ORC cycle, which involves pre-heating the organic fluid via vapour leaving the ORC turbine. As calculations showed this solution allows to considerably raise the thermal efficiency of Clausius-Rankine cycle.
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