Leszek Romański

Modelling of the effect of outside air temperature on exploitation of heat from geothermal water using the example of the geothermal heating plant PEC “Geotermia Podhalańska” S.A.

This paper reports the results of measurements and calculations of heat production from geothermal waters in a Polish geothermal plant in Banska in the years 2010–2013. Statistical analysis was used to create a regression model and an artificial neural network model. The models allow us to predict the volume of heat produced, depending on outside air temperature. In addition, the study indicates that geothermal energy is one of the most predictable sources of renewable energy, which is important from the point of view of reliability of exploitation. Production of energy from renewable sources, which include geothermal energy, fits the current trends in the energy policy of the Polish state.This paper reports the results of measurements and calculations of heat production from geothermal waters in a Polish geothermal plant in Banska in the years 2010–2013. Statistical analysis was used to create a regression model and an artificial neural network model. The models allow us to predict the volume of heat produced, depending on outside air temperature. In addition, the study indicates that geothermal energy is one of the most predictable sources of renewable energy, which is important from the point of view of reliability of exploitation. Production of energy from renewable sources, which include geothermal energy, fits the current trends in the energy policy of the Polish state.

The relation between CRI, CSR indexes, chemical composition and physical parameters of commercial metallurgical cokes

ABSTRACT The paper deals with comprehensive quality and physical parameters of commercial cokes. It aims to present comparative analysis of acquired values with standards found in other literature sources. There were analysed 15 samples of coke from current industrial operation. There were carried out chemical analysis, CSR and CRI characterization. Density, porosity, compressive strength, friction coefficient, volume of particles were determined. There was performed one-way analysis of variance (ANOVA) by Statistica v.12.0 (StatSoft, Inc., Tulsa, USA) to determine significant correlation between the measured parameters. The highest correlation coefficents were noted between the pycnometer density of cokes and CSR index (r = 0.925) and CRI index (r = −0.828). The comparative analysis of quality and physical parameters with values mentioned in literature revealed the significant differences in the values of apparent density, bulk density and true density of pulverized samples.

Impact of the irrigation dose amount on the wheat yield

Abstract The paper presents analysis of the impact of irrigation dose on the winter wheat Bystra yield, which is recommended for cultivation in Poland. It is a low-growing high-yield wheat cultivar. A reel sprinkler equipped with a computer for control of parameters of its operation, which was supplied with pond water was used for irrigation. Test were carried out on five fields, where four irrigation doses were used: 15, 20, 25, 30 mm. A change of weather during research in May and June caused the need to irrigate a field four times. During research, the size of the irrigation dose was measured with rain gauges on each of the investigated fields in five measurement points. One of the fields was a control field, which was not irrigated. The investigated wheat was characterized during harvesting. Research proved that the size of the irrigation dose influences the wheat yield. The grain yield between a control field and a field with the highest irrigation dose increased by twofold. Moreover, analysis of costs incurred during sprinkling were analysed.

Evaluation of New Holland CR9080 Operation

Abstract The paper evaluates operation of the separation unit of NH CR9080 combine harvester. A considerable technical and technological progress has taken place in presently used harvesters. Among others, efficiency increased and equipment has been enhanced with elements which improve the operation quality. The objective of the paper was to determine the quality of the separating unit of a combine harvester New Holland CR9080. During the research, losses on screens and rotor, cutting height of rapeseed, mowing speed, rotation of fans, rotors and engine were determined. Relation of losses on screens to combine operation parameters was determined with a model of multiple regressions. The rotational speed of rotors, mowing speed and rotational speed of the combine engine have a significant effect on losses on screens at the rapeseed harvesting with the investigated combine.

The impact of infrasounds generated by wind power stations on a human being

Abstract In some opinion-forming environments the problem of noise emitted by wind power stations is very controversial. It is even suggested that they negatively affect the quality and length of human life. Based on the review of domestic and foreign publications an analysis of the impact of the low-frequency noise on a human being was carried out. Wind power stations operating in groups (farms) constituted the source of noise. It was proved that the level of acoustic pressure with G weighting does not exceed the value of 85 dB. The value of the admissible burdensome noise (102 dB) was exceeded in the bus cabins which were driving with the speed exceeding 30 km·h−1. The opinion of the Ministry of Health confirms the findings. It proves that the present knowledge does not allow a clear indication of the relation between the wind farms and their negative impact on the human health.

Comparison of Applications Supporting Selection and Design of Household Solar Collector Systems

Abstract In order to support the designing process and selection of subassemblies of an installation, specialist application programs are created. Selected applications were compared in the paper through their use for designing hypothetical solar collector systems for a single family house with a varied number of household members. With the use of particular applications, calculations for the same input assumptions were made. Results obtained with the use of a traditional calculation method were a reference point. Applications were compared on account of the type and amount of input parameters which may be introduced, type and number of determined values and their value. Based on the obtained results usefulness and scope of use of an application were assessed.