Tag Archives: energy consumption

952–963 D. Berjoza and I. Jurgena
Effects of change in the weight of electric vehicles on their performance characteristics
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Effects of change in the weight of electric vehicles on their performance characteristics

D. Berjoza¹* and I. Jurgena²*

¹Latvia University of Agriculture, Technical Faculty, Institute of Motor Vehicles, 5 J. Cakstes boulevard, LV-3001 Jelgava, Latvia
²Latvia University of Agriculture, Faculty of Economics and Social Development, Institute of Business and Management Science, 18 Svetes str., LV-3001 Jelgava, Latvia
*Correspondence: dainis.berjoza@llu.lv; inara.jurgena@llu.lv

Abstract:

One of the parameters of electric vehicles that can affect their dynamic and range characteristics is their weight. Converting a vehicle with an internal combustion engine into an electric one, it is possible to vary its batteries and their placement. It is also possible to choose batteries of various capacities for serial electric vehicles, for example, Tesla Model S. Not only the costs of electric vehicles but also such performance characteristics as dynamics and travel range per charge depend on the number of batteries and the total weight of the electric vehicles. The research developed and approbated an algorithm for calculating comparative parameters for electric automobiles. The algorithm was approbated on 30 electric automobiles of various makes. Energy consumption per km distance travelled shows the exploitation cost of an electric automobile. According to this indicator, the most economical electric automobiles were as follows: Renault Twizy (67.8 Wh km-1), Tazzari Zero (87.9 Wh km-1) un Renault Zoe ZE22 (93.6 Wh km-1).

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46-52 J. Čedík,, M. Pexa, R. Pražan, K. Kubín and J. Vondřička
Mulcher energy intensity measurement in dependence on performance
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Mulcher energy intensity measurement in dependence on performance

J. Čedík¹,*, M. Pexa¹, R. Pražan², K. Kubín² and J. Vondřička¹

¹Czech University of Life Sciences, Faculty of Engineering, Department for Quality and Dependability of Machines, Kamycka 129, 16521, Prague 6, Czech Republic
²Research Institute of Agricultural Engineering, p.r.i., Drnovská 507, 16101, Prague 6, Czech Republic *Correspondence: cedikj@tf.czu.cz

Abstract:

Conventional impact grass cutting and chopping is energy intensive and therefore it is important to reduce energy demands of such a device. In the paper the energy demands of three-rotor mulcher with vertical axis of rotation was measured and analyzed in dependence on the mass performance of the mulcher. Different mass performance was achieved by different ground speed and yield of the grass cover. The measurement was performed on clover-grass meadow hay, from which the samples were taken and analyzed in order to determine the yield and moisture content of the vegetation. The results showed relatively high energy demands of the mulcher. In dependence on the mass performance of the mulcher it is necessary to deliver in average 10.4–22.6 kW m-1 of the width of the machine. Specific energy consumption varied in average from 3.35 to 6.34 kWh t-1 of the processed material and unit fuel consumption varied in average from 2.56 to 0.94 kg t-1.

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81-94 T. Jokiniemi, S. Jaakkola, M. Turunen and J. Ahokas
Energy consumption in different grain preservation methods
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Energy consumption in different grain preservation methods

T. Jokiniemi*, S. Jaakkola, M. Turunen and J. Ahokas

University of Helsinki, Department of Agricultural Sciences, P.O. Box 28, 00014, University of Helsinki, Finland;
*Correspondence: tapani.jokiniemi@helsinki.fi

Abstract:

The energy consumption of hot air drying and alternative feed grain preservation methods was examined. Alternative methods were airtight preservation, acid preservation and grain crimping. The results indicate that significant energy savings can be achieved by using any of these methods instead of hot air dying for preservation of home-grown grain used for animal feeding. Remarkable differences in the energy consumption between the alternative methods were also found. Grain crimping showed the lowest energy consumption, but the effect of the used additive and especially the storage system was large. A suitable option for different farm animal species can be found among these methods, and the limitations, when they exist, are set rather by the feeding technology than the nutritive value of the preserved grain.

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195-204 M. Rajaniemi and J. Ahokas
A case study of energy consumption measurement system in broiler production
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A case study of energy consumption measurement system in broiler production

M. Rajaniemi and J. Ahokas

Department of Agrotechnology, University of Helsinki, P.O. Box 28, 00014 Helsinki,
Finland

Abstract:

Energy savings in animal production have become increasingly important due to climate change and rising energy prices. In order to find potential savings, the energy consumption and its allocation inside the production systems must be known. The biggest energy input in broiler production is feed. To reduce this energy input the savings must be done in crop and feed production chain. This study focused on the direct energy consumption inside the broiler house. Ventilation, lighting, feeding and heating systems consume also a considerable large amount of energy. However, information of this energy consumption is incomplete, and variation between different locations, farms and broiler batches is large. In this study, the energy consumption of broiler production was measured in one insulated broiler house in Southern Finland. Energy consumption was measured from ventilation, lighting, feeding and heating during broiler batches. Also environmental factors, such as indoorand outdoor temperatures, carbon dioxide level and relative humidity were measured continuously, because they have an effect on energy consumption and the microclimate inside the building must be kept good. This data can also be used in calculations of ventilation heating demand. Energy consumption of ventilation, feeding and lighting were measured with current clamps. Clamps were located in the electrical center, and energy consumption was calculated from the measured current and voltage. Data was saved on a data logger. Heating energy was measured from the heating pipes. Energy consumption was calculated from the temperature difference of incoming and outgoing water and water flow rate. Measured data was uploaded from the data loggers after every broiler batch. Energy consumption was calculated for each broiler batch and per kg of slaughter weight.

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