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| Alaa Kiwan Kiwan; Leibniz Institute for Agricultural Engineering Potsdam-Bornim (ATB), Germany.; Werner Berg; Leibniz Institute for Agricultural Engineering Potsdam-Bornim (ATB), Germany.; Reiner Brunsch; Leibniz Institute for Agricultural Engineering Potsdam-Bornim (ATB), Germany.; Sezin Özcan; K.U. Leuven, Faculty of Bioscience Engineering, Leuven, Belgium.; Hans-Joachim Müller; Leibniz Institute for Agricultural Engineering Potsdam-Bornim (ATB), Germany.; Manfred Gläser; Leibniz Institute for Agricultural Engineering Potsdam-Bornim (ATB), Germany.; Merike Fiedler; Leibniz Institute for Agricultural Engineering Potsdam-Bornim (ATB), Germany.; Christian Ammon; Leibniz Institute for Agricultural Engineering Potsdam-Bornim (ATB), Germany.; Daniel Berckmans; K.U. Leuven, Faculty of Bioscience Engineering, Leuven, Belgium.. |
| Naturally ventilated barns have the advantage of providing an energy-efficient and low-noise micro-environment for animals. Such barns are very common, especially for cattle, which are a major source of ammonia and methane emissions as well as other airborne pollutants. Emission fluxes are calculated as the product of the ventilation rate (VR) and the gas concentration. The VR of naturally ventilated barns are directly influenced by atmospheric conditions. Therefore, the estimation of VR involves high uncertainties; furthermore, there is no reference method for VR estimation. For these reasons, three different methods were investigated to estimate VR through naturally ventilated dairy barns: (1) the tracer gas... |
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Palavras-chave: Natural ventilation; Tracer gas technique; Radioactive isotope 85Kr; Air velocity; Air exchange rate; Dairy barn. |
| Ano: 2012 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/1981 |
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| Abdelbary, Khaled M.. |
| Several dairy farms still have old multi-span barns which are encountering several problems in summer and they are: low ventilation rates, non-uniformed air distribution, heat stress and high indoor concentrations of harmful gases. A solution has been suggested, in this study, which is refurbishing the roofs of old multi-span dairy barns by modifying the roof design, increasing the cowshed height and the roof slope angle. In order to implement this new roof design, rigorous experimental measurements and theoretical calculations were carried out to evaluate the indoor environment before and after refurbishment which was determined by measuring and estimating the following parameters: air exchange rate, indoor temperature, gaseous concentrations (NH3, CH4,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultural Engineering Farm Buildings dairy buildings; Roof refurbishment; Natural ventilation; Indoor environment; Air quality; Gaseous emissions. |
| Ano: 2017 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4228 |
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| Moreira,André Luís; Silva,Adriano Bortolotti da; Santos,Aline; Reis,Caroline Oliveira dos; Landgraf,Paulo Roberto Correa. |
| The aim of the present research was to verify the in vitro growth of orchids in different systems of micropropagation, being cultivated in a bioreactor, with natural ventilation and conventional systems. Cattleya walkeriana plants were obtained from the germination of seeds in culture medium. After 8 months, seedlings with 1 cm of length were placed in a culture vessel according to the treatments, which counted with two micropropagation systems (conventional and natural ventilation) in three media of culture (liquid, solid with 5 or 6g L-1 of agar). Two additional treatments in bioreactor of temporary and continuous immersion were performed. The design was entirely randomized (ERD), consisting of a 2x3 factorial with two additional treatments, totaling 8... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioreactor; Temporary immersion; Liquid medium; Natural ventilation; In vitro culture. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013001000012 |
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