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Technological Properties of Thermo-insulating Moulding Sands with Organic Binder

K. Stec Marian Cholewa Ł. Kozakiewicz
Archives of Foundry Engineering | 2020 | vol. 20 | No 2 | 105-110 | DOI: 10.24425/afe.2020.131311
Keywords Skeleton castings Moulding sand Organic binder Technological properties CRS
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Abstract

A thermo-insulating moulding sand with a binder made of aluminosilicate microspheres with organic binder was subjected to testing. The aim of the analysis was to determine selected technological properties of the developed compounds. Compressive strength, friability and gas permeability were determined. The binder content was changed within a range of 5÷20 wt% with a 5% step. The applied matrix is characterized by good thermo-insulating properties and a small size of grains, while synthetic organic binder has favourable functional properties, among which the most noteworthy are the extended life and setting time, good rheological properties as well as high resistance to chemical agents. The intended use of the compound is the casting of 3D CRS (Composite Reinforced Skeletons), which are characterized by a well-developed heat transfer surface area, good absorption of impact energy, low mass and a target thickness of connectors within a range of 1.5÷3 mm. The construction of 3D CRS castings is an original concept developed by the employees of the Department of Foundry Engineering at the Silesian University of Technology.

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Authors and Affiliations

K. Stec
Marian Cholewa
Ł. Kozakiewicz

An analysis of the electricity supply at a public building utilizing photovoltaic systems and a microturbine

Paulina Sawicka-Chudy Elżbieta Rybak-Wilusz Maciej Sibiński Marian Cholewa Ryszard Pawełek
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi Polskiej Akademii Nauk | 2018 | Nr 107 | 47-62 | DOI: 10.24425/123721
Keywords photovoltaic installations tracking system fixed-tilt panels gas microturbine energy efficiency
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Abstract

Recently, the search for new effective energy production solutions has been focused on the production of electricity using renewable and environmentally friendly carriers. This resulted in an increased interest in PV cells and cogeneration systems. The article looks at the main factors affecting their operational parameters against the background of the development history of subsequent generations of PV cells. Average daily solar radiation and wind velocity in Lodz were characterized. The research was done on a static and tracking system with a total peak power of 15 kWp and a 30 kW microturbine. PV panels are installed on the building of the Institute of Electrical Power Engineering of the Lodz University of Technology and they work as part of DERLab. A microturbine is inside the building. Energy measurements were carried out in 2016 giving grounds for the analysis of energy efficiency and financial analysis of the energy supply in buildings. Energy yields in the static and tracking system as well as percentage coverage of electricity from PV cells and microturbines were assessed. The distribution of monthly savings, annual savings of energy costs and the payback time of the investment costs of the systems subject to the test were determined. The research we have done allows us to say that the energy produced by follow-up modules is about 3 times greater than that generated in stationary modules. On the other hand, the annual savings of energy costs using gas micro-turbines are about 10 times higher than those of lagging panels. The analysis shows that it is possible to determine the profitability of the microturbine and photovoltaic panels use despite large financial outlays. The payback period of investment outlays is about 12 years when using the installation throughout the year.

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Authors and Affiliations

Paulina Sawicka-Chudy
Elżbieta Rybak-Wilusz
Maciej Sibiński
Marian Cholewa
Ryszard Pawełek

Solar cells based on copper oxide and titanium dioxide prepared by reactive direct-current magnetron sputtering

Grzegorz Wisz Paulina Sawicka-Chudy Maciej Sibiński Zbigniew Starowicz Dariusz Płoch Anna Góral Mariusz Bester Marian Cholewa Janusz Woźny Aleksandra Sosna-Głębska
Opto-Electronics Review | 2021 | 29 | 3 | 97-105 | DOI: 10.24425/opelre.2021.139039
Keywords solar cells copper oxides titanium dioxide reactive magnetron sputtering
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Abstract

In this study, solar cells based on copper oxide and titanium dioxide were successfully manufactured using the reactive direct-current magnetron sputtering (DC-MS) technique with similar process parameters. TiO2/CuO, TiO2/Cu2O/CuO/Cu2O, and TiO2/Cu2O solar cells were manufactured via this process. Values of efficiencies, short-circuit current, short-circuit current density, open-circuit voltage, and maximum power of PV devices were investigated in the range of 0.02÷0.9%, 75÷350 µA, 75÷350 µA/cm2, 16÷550 mV, and 0.6÷27 µW, respectively. The authors compare solar cells reaching the best and the worst conversion efficiency results. Thus, only the two selected solar cells were fully characterized using I-V characteristics, scanning electron microscopy, X-ray diffraction, ellipsometry, Hall effect measurements, and quantum efficiency. The best conversion efficiency of a solar cell presented in this work is about three times higher in comparison with the authors’ previous PV devices.
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Authors and Affiliations

Grzegorz Wisz
1
ORCID: ORCID
Paulina Sawicka-Chudy
1
ORCID: ORCID
Maciej Sibiński
2
ORCID: ORCID
Zbigniew Starowicz
3
ORCID: ORCID
Dariusz Płoch
1
ORCID: ORCID
Anna Góral
3
Mariusz Bester
1
ORCID: ORCID
Marian Cholewa
1
Janusz Woźny
4
ORCID: ORCID
Aleksandra Sosna-Głębska
2
  1. Institute of Physics, College of Natural Science, University of Rzeszów, 1 Pigonia St., 35-317 Rzeszów, Poland
  2. Department of Semiconductor and Optoelectronic Devices, Łódź University of Technology, 211/215 Wólczańska St., 90-924 Łódź, Poland
  3. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta St., 30-059 Kraków, Poland
  4. Department of Semiconductor and Optoelectronic Devices, Łódź University of Technology, 211/215Wólczańska St., 90-924 Łódź, Poland

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