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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Investigations on the calorific value of forest chips

100%
Gendek A., Zychowicz W.
Annals of Warsaw University of Life Sciences - SGGW. Agriculture
|
2014
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nr 63 Agric.Forest Eng.
2
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The determination of heating and cooling day values using degree-day method: tomato plant example

86%
Yucel A., Atilgan A., Oz H., Saltuk B.
Infrastruktura i Ekologia Terenów Wiejskich
|
2014
|
nr IV/1
Based on the amount and duration of external temperature, degree day values are determined according to whether the selected equilibrium temperature is lower or higher than the air temperature. Degree day values are calculated according to the fluctuations in ambient temperature. It can be understood whether heating or cooling systems are necessary within the calculated periods. In this study, the meteorological data of Antalya region dating back many years and the temperature values suggested according to the cultivation periods of tomato in greenhouse environment have been used as material. The daily average temperature values recorded for many years have been compared with the equilibrium temperature values selected for the tomato plant thereby calculating the heating and cooling day values for each cultivation period. Tomato cultivation in greenhouses is carried out in 2 periods in the region in spring and autumn. At the end of these two periods, it was determined that the heating degree days in autumn were determined to be higher than that in spring. Whereas cooling degree days were determined to be greater for autumn cultivation in comparison with that of spring cultivation. Information regarding the energy consumption of an agricultural structure can be obtained beforehand via the heating and cooling degree day values. It has been surmised that such studies will help in making estimations regarding the energy need of various agricultural structures as well as gaining insight in the planning of the design stages that are directly related to the energy consumption of the building such as heating, cooling and ventilation.
3
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Higher and lower heating values of selected lignocellulose materials

86%
Dukiewicz H., Waliszewska B., Zborowska M.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2014
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tom 87
4

Energetic evaluation of postharvest corn mass for heating purposes

72%
Niedziolka I., Szymanek M., Zuchniarz A.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
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2006
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tom 06A
5
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Heating value of seeds of leguminous plants and their mixes with seeds of tussock-grass subfamily cereals

72%
Wcislo G., Zabinski A., Sadowska U.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
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2013
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tom 13
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nr 2
6
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The influence of the kind and the moisture content of straw on its heating value

72%
Kowalczuk J., Zarajczyk J., Leszczynski N., Niedziolka I., Szymanek M., Sobczak P., Zawislak K., Wieczorkowska A.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
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2014
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tom 14
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nr 3
7
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Thermophysical and chemical properties of perennial energy crops depending on harvest period

72%
Stolarski M. J., Krzyzaniak M., Snieg M., Slominska E., Piorkowski M., Filipkowski R.
International Agrophysics
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2014
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tom 28
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nr 2
This paper presents analyses of the thermophysical and chemical properties of eleven perennial crop species harvested in one-year rotation cycles. The crops included four species grown for biomass in the form of straw, five species producing semi-wood biomass, and two species yielding wood biomass. The research comprised three consecutive crop harvests. In each harvesting season, biomass samples for analyses were taken on six dates at one-month intervals. Thermophysical and chemical properties of the biomass were significantly differentiated within the main experimental factors and their interactions. The biomass produced by Virginia mallow had the best quality parameters as solid fuel. In fact, it achieved the lowest water content and the highest lower heating value during all of the analyzed seasons and harvest dates. The biomass of the species yielding straw or semi-wood products attained better quality as solid fuel on later harvest dates. In turn, the quality of willow biomass remained practically unchanged between the harvest dates.
8
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Properties of pellets made of agglomerated pine and spruce sawdust with the addition of wheat bran

72%
Dobrowolska E.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2023
|
nr 124
9

Dynamics of energy accumulation by Festuca arundinacea Schr. and festulolium Felina

72%
Kocourkova D., Mrkvicka J., Fuksa P.
Acta Agraria et Silvestria. Series Agraria
|
2003
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tom 40
|
nr Sek.roln.
The usefulness of Festuca arundinacea Schr. (variety Kora) and festulolium F. arundinacea x Lolium multiflorum Lam. (variety Felina) as biofuel was observed in the year 2002. The energy accumulation and N content in the biomass during vegetation were studied in cca 14 days intervals. There were no significant differences in heating value neither by variety nor by samplings and they ranged from 16.97 to 18.30 MJ kg-1. The yield of dry mass in the second cut was significantly higher (a = 0,01) for festulolium and reached 4.4 t ha-1 on the contrary to 4.0 t ha-1 for F. arundinacea. Dependence (a = 0.05) between the N content and sequence of samplings was proved.
10
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Jerusalem artichoke (Helianthus tuberosus L.) as renewable energy raw material

58%
Kowalczyk-Jusko A., Jozwiakowski K., Gizinska M., Zarajczyk J.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
|
2012
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tom 12
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nr 2
11
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Energetic properties of green chips made of branches of wood species Populus x euroamericana clone Pannonia grown on plantations

58%
Dzurenda L.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2013
|
tom 82
12

Energetic characteristics of green chips made of branches of wood species Populus deltoides clone Cifra grown on plantations

58%
Dzurenda L., Hecl V., Dzurenda M.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2012
|
tom 77
In this contribution, there are presented the results of determination of energetic characteristics of green chips of wood species Populus Deltoides clone Cifra such as: share of bark in chips, elementary chemical composition of chip combustible, volume of ashes in dry mass of bio-fuel and lower heating value of bio-fuel in dry state. Green chips made of branches of wood species grown on plantations: Populus Deltoides clone Cifra consists of juvenile wood and juvenile bark. The share of juvenile bark in analysed green chips XB = 43,41 ± 3,76 %. The chemical composition of the combustible of green chips consists of: Cdaf = 49,69 %, Hdaf = 5,82 %, Odaf = 43,96 % and Ndaf = 0,53 %. The combustible of green chips does not differ from the chemical composition of combustible of fuel wood except for nitrogen, whose value is 3 times higher, than the amount of nitrogen in fuel wood. The share of ashes from green chips produced from branches of trees of fast growing wood species: Populus Deltoides clone Cifra, determined by form of weighted mean of the content of ash in juvenile wood, juvenile bark and the share of bark in chips is Ad = 2,49 %, which is 3,5 to 5,0 times higher value, than the value of share of ash from broad-leaved wood species. The lower heating value of subjected chips in dry state is Qn = 17 507 kJ.kg-1. This value is, in comparison with the lower heating value of wood of broad-leaved wood species shown in EN 14 961 Solid bio-fuels – Specification and classes of fuels, lower by 4,5 % .
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