Temat: economic balance - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Economic analysis of stationary and spatially optimized photovoltaic systems for Polish climatic conditions
Autorzy:: Bugała, A.
Frydrychowicz-Jastrzębska, G.
Powiązania:: https://bibliotekanauki.pl/articles/97238.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:: tracking system
economic balance
photovoltaics
payback time
Opis:: The paper presents the economic aspect of use two - axis Sun tracking systems compared with stationary units in photovoltaics on the basis of own annual measurements of electrical energy for local urban conditions. The results were scaled to maximum power of 10 kW_p. Electricity consumption by positioning system and maintenance costs were included and estimated payback period of investment for different variants of settlement of produced energy, taking into account own financing, banking and preferential subsidies under the Prosumer program from the National Fund for Environmental Protection and Water Management, was calculated.
Źródło:: Computer Applications in Electrical Engineering; 2014, 12; 452-461
1508-4248
Pojawia się w:: Computer Applications in Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Impact of Extrusion on the Biogas and Biomethane Yield of Plant Substrates
Autorzy:: Pilarski, K.
Pilarska, A. A.
Witaszek, K.
Dworecki, Z.
Żelaziński, T.
Ekielski, A.
Makowska, A.
Michniewicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/952409.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: extrusion
lignocellulosic biomass
anaerobic digestion
biomethane yield
economic balance
Opis:: The objective of the present work was to determine the effect of pretreatment by extrusion on the biogas and biomethane yield of lignocellulosic substrates such as maize silage and maize straw silage. The biogas yields of the substrates before and after treatment were compared. Moreover, energy efficiency of pretreatment by extrusion was analyzed in order to assess the applicability of the process in an agricultural biogas plant. Extrusion tests were carried out in a short single-screw extruder KZM-2 in which the length-to-diameter ratio of the screw was 6:1 and rotational speed was 200 rpm. The biogas yield tests of the plant substrates after extrusion were carried out in a laboratory scale, using 15 biofermenters operated in a periodic manner, at a constant temperature of 39°C (mesophilic digestion) and controlled pH conditions. The gas-emission analysis was performed using a certified gas analyzer from Geotech GA5000. Pretreatment by extrusion was observed to improve the quantity of methane generated: in terms of fresh matter for maize silage subjected to extrusion, the methane yield was 16.48% higher than that of the non-extruded silage. On the other hand, maize straw silage after extrusion gave 35.30% more methane than did the same, non-extruded, material. Differences in yields relative to dry organic matter are also described in this paper. Taking into account the amount of energy that is spent on pretreatment and the generated amount of methane, the energy balance for the process gives an idea of the economics of the operation. For maize silage, energy efficiency was lower by 13.21% (-553.2 kWh/Mg), in contrast to maize straw silage, where the increase in energy was 33.49% (678.4 kWh/Mg). The obtained results indicate that more studies on the pretreatment and digestion of maize silage are required in order to improve the efficiency of its use for making biogas. To fully utilize its potential, it is necessary to know thoroughly the effect of the extrusion process and of biogas production on energy efficiency at different conditions.
Źródło:: Journal of Ecological Engineering; 2016, 17, 4; 264-272
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Wybrane sposoby wzmacniania skorodowanej stalowej obudowy odrzwiowej
Selected ways of reinforcing the corroded steel arch support
Autorzy:: Prusek, St.
Rotkegel, M.
Małecki, Ł.
Powiązania:: https://bibliotekanauki.pl/articles/164781.pdf
Data publikacji:: 2015
Wydawca:: Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:: obudowa wyrobisk korytarzowych
górnictwo
korozja
wzmacnianie obudowy wyrobisk korytarzowych
rachunek ekonomiczny
roadway supports
mining
corrosion
reinforcing roadway supports
economic balance
Opis:: W artykule porównano wybrane, najczęściej stosowane metody wzmacniania skorodowanej stalowej obudowy wyrobisk korytarzowych. Zestawiono cechy charakterystyczne poszczególnych metod oraz koszty stosowania niektórych z nich. Spośród analizowanych sposobów najbardziej efektywnym wydaje się być torkretowanie. Przemawia za tym rachunek ekonomiczny oraz poziom bezpieczeństwa prowadzonych prac. Jednak skuteczność obudowy powłokowej z betonu natryskowego wymaga zapewnienia odpowiednich parametrów zgodnych z przyjętymi na etapie projektowania.
This paper compares the most commonly used methods of reinforcing corroded steel arch roadway supports. The characteristics the costs of use of the presented methods are summarized. Among the analyzed, the most effective way of reinforcing appears to be shotcreting. This is influenced by the economic balance and the level of work safety. However, to ensure the effectiveness of the shotcrete lining it is necessary to obtain shotcrete parameters corresponding to those used at the design stage.
Źródło:: Przegląd Górniczy; 2015, 71, 5; 71-77
0033-216X
Pojawia się w:: Przegląd Górniczy
Dostawca treści:: Biblioteka Nauki

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