Influence of sampling positions on accuracy of tracer gas measurements in ventilated spaces

Buggenhout, Sandy Van; Brecht, Andres Van; Özcan, Sezin Eren; Vranken, Erik; Malcot, W Van; Berckmans, Daniël

doi:10.1016/j.biosystemseng.2009.04.018

Cited by 100 publications

(49 citation statements)

References 33 publications

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“…The second source of uncertainty is the measurement of ventilation rates. In mechanically ventilated buildings this uncertainty has been reported to be at best 5-10% of the measured ventilation, but in naturally ventilated buildings measurement errors may be considerably higher (Van Buggenhout et al, 2009). Very open, naturally ventilated livestock houses are currently an interesting alternative against intensively controlled buildings, particularly in cattle and pig buildings.…”

Section: Research Needs and Future Prioritiesmentioning

confidence: 99%

Strategies to control odours in livestock facilities: a critical review

Ubeda

Jiménez

Nicolas

et al. 2013

Span. j. agric. res.

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Odours generated in livestock buildings constitute one of the most relevant air quality issues of intensive livestock production. Reducing nuisance episodes related to odour exposure is therefore essential for a sustainable livestock production. In this study, the state-of-the-art on odour mitigation techniques in livestock housing is critically reviewed. Scientific advances in the last decade are revised and research needs are also identified. The complex nature of livestock odours is firstly reviewed and examined. Then, the most relevant odour control strategies are analyzed in terms of present knowledge and future needs. The strategies considered are: nutritional strategies, manure additives, building design, air filtration, manure covers, manure treatment systems and windbreaks. Finally, future research needs and priorities when establishing mitigation techniques are identified. Despite important recent advances, there are still some challenges for scientists, producers and regulators, particularly related to field evaluation of odours. Therefore, to control livestock odours effectively, using standardized f ield assessment techniques will be required. Also, investigating measurement and model errors may be useful to better understand the limitations of the current methods, as well as to identify research priorities.

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Section: Research Needs and Future Prioritiesmentioning

confidence: 99%

Strategies to control odours in livestock facilities: a critical review

Ubeda

Jiménez

Nicolas

et al. 2013

Span. j. agric. res.

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“…However, applications of tracer gases in production facilities are often limited because the process requires uniform air -tracer mixing to ensure good results, which is difficult to achieve in commercial production settings. Van Buggenhout et al [16] demonstrated that in a mechanically ventilated test installation with accurate reference method, tracer gas experiments were performed to demonstrate the apparent difficulties. Certain tracer gases, such as SF6, also cause negative impacts to the environment.…”

Section: Introductionmentioning

confidence: 99%

Balance Model to Calculate the Ventilation Rate of a Mechanically Ventilated Finishing Pig House in East China

Zhou¹,

Zhu²,

Li³

et al. 2017

Proceedings of the 2017 International Conference on Material Science, Energy and Environmental Engineering (MSEEE 2017)

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“…Many of the studies on natural ventilation have employed the tracer gas method, which allows the ventilation rate to be quantified accurately, but provides no information on the airflow characteristics inside the greenhouse . Van Buggenhout et al (2009) established that the position of the sensors that detect the concentration of gas can lead to errors of upto 86% and this is particularly relevant if this method is used to validate CFD simulations. The first work to study the natural ventilation of greenhouses using CFD was by Okushima et al (1989).…”

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confidence: 99%

Determinación de los patrones de flujo de aire en un invernadero multitúnel mediante anemometría sónica

López¹,

Valera²,

Molina-Aiz³

et al. 2012

Span. j. agric. res.

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The present work describes a methodology for studying natural ventilation in Mediterranean greenhouses using sonic anemometry. The experimental work took place in the three-span greenhouse located at the agricultural research farm belonging to the University of Almería. This methodology has allowed us to obtain patterns of natural ventilation of the experimental greenhouse under the most common wind regimes for this region. It has also enabled us to describe how the wind and thermal effects interact in the natural ventilation of the greenhouse, as well as to detect deficiencies in the ventilation of the greenhouse, caused by the barrier effect of the adjacent greenhouse (imply a mean reduction in air velocity close to the greenhouse when facing windward of 98% for u, 63% for u y , and more importantly 88% for u x , the component of air velocity that is perpendicular to the side vent). Their knowledge allows us to improve the current control algorithms that manage the movement of the vents. In this work we make a series of proposals that could substantially improve the natural ventilation of the experimental greenhouse. For instance, install vents equipped with ailerons which guide the air inside, or with vents in which the screen is not placed directly over the side surface of the greenhouse. A different proposal is to prolong the opening of the side vents down to the soil, thus fomenting the entrance of air at crop level.Additional key words: buoyancy; insect-proof screens; natural ventilation; wind effect. ResumenDeterminación de los patrones de flujo de aire en un invernadero multitúnel mediante anemometría sónicaEn este trabajo se ha desarrollado una metodología para estudiar la ventilación natural en invernaderos mediterrá-neos mediante anemometría sónica. Los ensayos se han realizado en un invernadero multitúnel de tres módulos situado en el Campo de Prácticas de la Universidad de Almería. Esta metodología nos ha permitido obtener los patrones de ventilación natural del invernadero experimental para los vientos más comunes de la región. También nos ha permitido describir la interacción entre el efecto eólico y térmico, así como detectar deficiencias en la ventilación natural del invernadero debidas al efecto barrera de otro invernadero adyacente (provocando una reducción media en la velocidad del aire en el exterior de la ventana de barlovento de hasta el 98% para u, 63% para u y y, más importante, 88% para u x , la componente de la velocidad del aire que es perpendicular a la superficie de ventilación lateral). Los conocimientos adquiridos en este trabajo nos permitirán mejorar los algoritmos de control del sistema de ventilación. En este trabajo se realizan una serie de propuestas que podrían mejorar sustancialmente la ventilación natural del invernadero. Por ejemplo, se proponen algunas posibles modificaciones de la configuración de las ventanas laterales, buscando una mayor captación del aire exterior: se podría optar por ventanas dotadas de alerones exteriores que dirijan al aire hacia el inte...

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Influence of sampling positions on accuracy of tracer gas measurements in ventilated spaces

Cited by 100 publications

References 33 publications

Strategies to control odours in livestock facilities: a critical review

Strategies to control odours in livestock facilities: a critical review

Balance Model to Calculate the Ventilation Rate of a Mechanically Ventilated Finishing Pig House in East China

Determinación de los patrones de flujo de aire en un invernadero multitúnel mediante anemometría sónica

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