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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Wind-caused air transport through greenhouse screens: a physical modelling approach

100%
Miguel A. F.
International Agrophysics
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1999
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tom 13
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nr 2
2

Porous ceiling air inlet as a potential source of uncontrolled air exchange at nurseries with exhaust mechanical ventilation

100%
Kuczynski T., Przybyla K.
Electronic Journal of Polish Agricultural Universities. Series Agricultural Engineering
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2002
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tom 05
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nr 1
The purpose of the research was to compare uncontrolled air exchange at nurseries with different air inlet solution. Four identical 400 m2 nursery departments were investigated. Three of them used porous ceiling as an air inlet, with different area of ceiling designed to be permeable. The areas of porous ceiling tested were 300, 150 and 75 m2 respectively. In fourth department ventilation air entered the room through, also located in the ceiling, high speed inlet systems. Actual air exchange in the departments was evaluated from H2O balance. The data required for calculation, i.e. inside and outside temperatures and humidities were being continuously monitored and registered from mid of December, 2000 to early February, 2001 to include first 5 weeks after moving piglets to each departments. Propane consumption was checked every day. U – value for the outside walls was calculated and additionally checked by means of thermovision.
3

Effect of environment control on inside environment, health and welfare of early weaned piglets

100%
Kuczynski T., Houszka H., Jasiewicz M.
Annals of Animal Science. Supplement
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2002
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nr 1
4

Ocena mikroklimatu inkubatora w zależności od intensywności jego wentylowania

80%
Niedziolka J., Malec H.
Acta Agraria et Silvestria. Series Zootechnica
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1988
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tom 27
5
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Feasibility of using heat-recovery exchangers in livestock buildings at a site at a specific altitude with a specific average outdoor air temperature

80%
Sleger V., Neuberger P., Polak M.
Infrastruktura i Ekologia Terenów Wiejskich
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2009
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nr 07
The installation of an energy-saving facility must be preceded by analysis of its financial effectiveness. Among methods enabling such evaluation is the basic net profit calculation method. For this, the annual consumption of electricity for ventilation or of thermal energy for heating must be determined. The calculation formula uses the sum of energies for temperatures within the range from the calculation temperature for the area in question to the long-term average of the maximum temperature at the site, or to the temperature at which the heating power is zero. It is necessary to know the summary time of occurrence of a given temperature during a year. The site data can only be assessed based on long-term meteorological information. In fact, data used by current national standards to describe climatic conditions in the Czech Republic are from the years 1901 to 1950. The dependence of the average yearly temperature on altitude is shown in Fig. 1 for the 1961 1990 and 1991 2000 periods. It is evident that the average temperatures for the latter period are nearly 0.6 K higher than those for the former period, irrespective of the altitude. In this paper the climatic conditions are assessed based on daily data measured throughout the period from 1 January 1991 to 31 December 2000. Weather stations were selected so as to achieve a uniform coverage and continuity of measurement at each site (as far as possible). All the stations lie in the Czech Republic between 48.8° and 50.8° north latitude at altitudes from 158 m to 1324 m. It was the objective of this examination, based on the meteorological data collected to calculate the average number of days and hours during which the temperature during the year is lower than a specific limiting level, in dependence on the average yearly temperature of the site. Fig. 3 shows the average number of days in a year during which a temperature lower than a selected limiting level occurs, as calculated for the 1991 2000 period. The results are presented for 4 areas with average yearly temperatures of 6 °C 7 °C, 7 °C 8 °C, 8 °C 9 °C, and 9 °C 10 °C, respectively. The graphs enables us to ascertain the number of days during which a heating facility is in operation if the facility is activated by outdoor air temperature decrease to below a specific limiting level. If a typical daily temperature wave is considered, the method makes it possible to estimate the number of hours during which the air temperature is lower than the limiting level chosen. The difference between the data for various limiting levels allows us, for an area with a specific average yearly temperature to ascertain the time of occurrence of outdoor temperature within various ranges. The results of calculations are shown in Fig. 4 and Table 1. The method applied enables underlying data to be prepared for the assessment of energy demands for air heating at a given site and for estimation of the energy savings that could be achieved by installing economical air heating facilities in livestock buildings.
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