Wyniki wyszukiwania - BazTech

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Elements of supercritical CO2 cycle - mathematical modeling and validation on available experimental data

Milewski Jarosław, Szczęśniak Arkadiusz, Szablowski Łukasz, Futyma Kamil, Lis Piotr, Dybiński Olaf, Wołowicz Marcin

Journal of Power Technologies

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2022

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Vol. 102, nr 1

1--13

EN

This paper presents models of three elements: heat exchanger, compressor and expander dedicated to supercritical CO2 cycles (Brayton). The models are built using Ebsilon software and validated against experimental data from available literature. Radial turbomachinery and thin plate heat exchangers were used to meet the demands of the relatively compact design of the S-CO2 cycle elements. It seems that there are no general relationships for the turbomachinery and real characteristics need to be used for constructing the models.

2

Comparative analysis of effeciency of waste heat conversion in low-temperature Brayton cycle

Borsukiewicz A., Stawicki P.

Chemical and Process Engineering

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2018

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Vol. 39, nr 1

103–-112

EN

The paper discusses the feasibility, effectiveness and validity of a gas turbine power plant, operated according to the Brayton comparative cycle in order to develop low-potential waste heat (160◦C) and convert it into electricity. Fourteen working fluids, mainly with organic origin have been examined. It can be concluded that low molecular weight working fluids allow to obtain higher power efficiency of Brayton cycle only if conversions without taking into account internal losses are considered. For the cycle that takes into account the compression conversion efficiency in the compressor and expansion in the gas turbine, the highest efficiency was obtained for the perfluoropentane working medium and other substances with relatively high molecular weight values. However, even for the cycle using internal heat recovery, the thermal efficiency of the Brayton cycle did not exceed 7%.

3

Dual ORC-Brayton power system for waste heat recovery in heavy-duty vehicles

Cholewiński M., Pospolita W., Błoński D.

Archives of Transport

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2016

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Vol. 39, iss. 3

7--19

EN

Reducing the amount of energy required in industrial activities is one of the proven ways to achieve major cost savings, especially in the face of soaring energy prices. In the transport sector, besides the financial benefits, low energy consumption leads to the significant reduction of emissions of many pollutants. In this paper the new concept of dual power technology, dedicated to heavy road transport, was modelled and analysed by computer simulations. The combination of organic Rankine cycle and Brayton cycle was proposed, where the waste heat of fumes was recognized as a upper heat source, whereas the surrounding was adopted to be the lower one. Improvement of total energy conversion efficiency of the truck was the key success factor. Environmental friendly fluids (air and R123) were utilised. The operating parameters, power characteristics and energy streams (i.e. dispersion) of the system were evaluated, calculated and commented from the perspective of its theoretical profitability. The calculated net power capacity of analysed dual system was around 50 hp for 100% load. However, when the engine load is below 50% of nominal capacity, the power generation of combined system might be lower than in the case of single ORC system.

4

Model of an ANSALDO V94.2 gas turbine from Lublin Wrotków Combined Heat and Power Plant using GateCycle™ software

Kowalczyk B., Kowalczyk C., Badyda K., Rolf R. M.

Journal of Power Technologies

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2014

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Vol. 94, nr 3

190--195

EN

This paper concerns the model of the ANSALDO V94.2 gas turbine for variable operating conditions from CHP Lublin Wrotków. General Electric GateCycle™ software was used to build the model. The gas turbine modeling methods used in the software were described. To assess the model, computations were performed for 40% and 70% load for 0.9, 14 and 30 ºC ambient temperature and 100% load for -20, 0.9, 14, 15 and 30 ºC ambient temperature. The results were compared with available heat balances of the object. The paper also discusses the theory of gas turbines, considering the sensitivity of the thermodynamic cycle.

5

Performance analysis of a gas turbine air heat recovery unit using GateCycle® software

Kowalski M., Badyda K.

Journal of Power Technologies

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2012

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Vol. 92, nr 1

48-54

EN

The following article concerns the results of an analysis of a gas turbine (GT) with an air heat recovery turbine unit (AHRTU) using General Electric GateCycle® software. The analysis was conducted for five different variants of air heat recovery turbine units: (i) simple AHRTU, (ii) with air cooling by one intercooler, (iii) with air cooling by two intercoolers, (iv) with variable humidity before the compressor, and (v) with water injection into the compressor. Each variant was tested for four different air temperatures before air turbine (ATBAT): 573 K, 673 K, 773 K, and 873 K. For each air temperature before air turbine, computations were run for increasing compression ratios (CR): from 3 to 6.5 for variants 1 and 4 and from 3 to 12 for variants 2,3 and 5. The results were shown as graphs of specific power (SP) of the AHRTU versus compression ratio in the AHRTU.