Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

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Neuberger P. , Šleger V. , Polák M. 2008. DESIGNING AND OPERATION OF THE EVAPORATIVE SYSTEM FOR AIR COOLING IN STABLES, EJPAU 11(2), #14.
Available Online: http://www.ejpau.media.pl/volume11/issue2/abs-14.html

ABSTRACT

Contribution describes procedures during designing of evaporative cooling system for inner air cooling in stables under different climatic condition. There are described an effect of different device types and recommendation for its operation.

Two types of equipment are used in agriculture for evaporative cooling: pressure nozzles and evaporative panels. The sufficient 80 % adiabatic efficiency can be expected in the equipment with spray nozzles at the 5 MPa water pressure before the nozzle and with the properly installed standard wetted surface 100 mm thick, over which air flows at a rate of 1 m·sec^-1.

When deciding the installation of the cooling equipment, it is important to take into account local climatic conditions. The future evolution of climate is estimated by means of mathematical models. Should the limit be determined for the efficient use of the evaporative cooling for example in the stable for growing and finishing pigs at an annual temperature maximum above 33°C, it is suitable to install the equipment in the current period in places with the average summer temperature above 16.5°C. However, around 2050, this would already be in places where the average temperature is now above 15.5°C in the summer months. Thanks to knowledge of the future values, it is possible to find out what is called a space analogue, i.e. a place where a similar situation occurs at the present time and will be there in the future.

In the current and future period, it is sufficient to design equipment that is able to evaporate about 5-6 grams water into each cubic meter of the ventilation air. On the basis of this value and the given volume of the ventilation air in the stable, it is possible to determine the necessary number of nozzles or, as the case may be, the volume of the evaporative panel.

Simultaneously with the evaporative cooling, other important means should be used for increasing the comfort of animals, such as shading the buildings, increasing the airflow rate around animals and directing the flow of ventilation air directly to the zone of animals.

Key words: stables, cooling and ventilation, evaporative systems, climate modeling.

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Pavel Neuberger
Department of Mechanics and Engineering,
Czech University of Life Science, Prague, Czech Republic
165 21 Praha 6 – Suchdol, Czech Republic

Vladimír Šleger
Department of Mechanics and Engineering,
Czech University of Life Science, Prague, Czech Republic
165 21 Praha 6 – Suchdol, Czech Republic
email: sleger@tf.czu.cz

Martin Polák
Department of Mechanics and Engineering,
Czech University of Life Science, Prague, Czech Republic
165 21 Praha 6 – Suchdol, Czech Republic
email: karel@tf.czu.cz

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Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.

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