Development of a reference method for airflow rate measurements through rectangular vents towards application in naturally ventilated animal houses: Part 1: Manual 2D approach

Overbeke, Philippe Van; Pieters, Jan; Vogeleer, Gerlinde De; Demeyer, Peter

doi:10.1016/j.compag.2014.05.005

Cited by 13 publications

(6 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ventilation rate is commonly controlled by the fan operation rate; however, in most situations, fans provide less airflow compared to the prescribed rate by the manufacturer or theoretical values due to aging, the presence of shutters, and nonuniform indoor static pressure [4,5]. To measure the actual ventilation rates, various experimental methods can be employed, such as the use of anemometers or air velocity sensors to directly measure the airflow at specific inlet and outlet points [6]. These instruments can provide real-time airflow velocity data, which can be combined with the cross-sectional area of openings to calculate the volumetric airflow rate.…”

Section: Introductionmentioning

confidence: 99%

“…These instruments can provide real-time airflow velocity data, which can be combined with the cross-sectional area of openings to calculate the volumetric airflow rate. However, determining the best measurement points that represent the total airflow rate is challenging due to the non-uniformity of the velocity profile within the opening [6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Actual Ventilation Rates and Efficiency in Research-Scale Pig Houses Based on Ventilation Configurations

Lee,

Choi,

Park

et al. 2023

Animals

View full text Add to dashboard Cite

Accurate ventilation control is crucial for maintaining a healthy and productive environment in research-specialized pig facilities. This study aimed to evaluate actual ventilation rates and ventilation efficiency by investigating different inlet and exhaust configurations. The research was conducted in two pig rooms, namely pig room A and pig room B, in the absence of animals and workers to focus solely on evaluating the ventilation system’s performance. Actual ventilation rates were measured using hood-type anemometers, and the local air change per hour was analyzed at various measurement points via tracer gas decay experiments. The results demonstrated that specific inlet and exhaust combinations, such as side inlet/chimney outlet and ceiling inlet/side outlet, exhibited higher ventilation rates. However, the measured ventilation rates were much lower than the manufacturer’s specifications. The side exhaust fan closer to the pig activity space demonstrated better ventilation effectiveness for the animals than the chimney exhaust fan. Additionally, the ceiling inlet exhibited superior air distribution and uniformity. Lower ventilation rates and higher infiltration ratios resulted in reduced ventilation efficiency, with the difference between pig and worker activity spaces being pronounced. This study emphasizes the importance of selecting optimal inlet and exhaust configurations to achieve efficient ventilation and create a healthy environment for both pigs and workers.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Actual Ventilation Rates and Efficiency in Research-Scale Pig Houses Based on Ventilation Configurations

Lee,

Choi,

Park

et al. 2023

Animals

View full text Add to dashboard Cite

show abstract

“…Detailed airflow rate calculations were executed using the method of Van Overbeke et al [1,30,31]. Data was collected for different experimental setups during periods of variable outside weather conditions.…”

Section: General Approachmentioning

confidence: 99%

“…Artificial Neural Networks (ANN) were applied to evaluate the input variables before applying linear algorithms in order to find existing correlations. The algorithms were validated by comparing to detailed airflow rates obtained by the measuring method of Van Overbeke et al [1,30,31] as a reference.…”

Section: Introductionmentioning

confidence: 99%

Assessing airflow rates of a naturally ventilated test facility using a fast and simple algorithm supported by local air velocity measurements

Vogeleer

Overbeke

Brusselman³

et al. 2016

Building and Environment

Self Cite

View full text Add to dashboard Cite

a b s t r a c tThe high spatial and temporal variations of airflow patterns in ventilation openings of naturally ventilated animal houses make it difficult to accurately measure the airflow rate. This paper focusses on the development of a fast assessment technique for the airflow rate of a naturally ventilated test facility through the combination of a linear algorithm and local air velocity measurements. This assessment technique was validated against detailed measurement results obtained by the measuring method of Van Overbeke et al. (2015) as a reference.The total air velocity U , the normal Y and tangential velocity component X and the velocity vector For bi-directional flows a multiple linear model was suggested where input variable U gave the best results to assess the airflow rate.

show abstract

“…More recently, new approaches based on direct measurements of velocity profiles (using ultrasonic anemometers) have been developed. However, these methods either have not yet been validated by comparison against existing methods (Joo et al, 2014) or were developed in laboratory/prototype conditions and are not yet readily transferable to conditions in commercial animal houses (Van Overbeke, De Vogeleer, Brusselman, Pieters, & Demeyer, 2015;Van Overbeke, De Vogeleer, Pieters, & Demeyer, 2014;Van Overbeke, Pieters, De Vogeleer, & Demeyer, 2014). More research is therefore needed to validate their applicability and improve measurement accuracy in naturally ventilated barns.…”

Section: Introductionmentioning

confidence: 99%

Comparison of CO2- and SF6- based tracer gas methods for the estimation of ventilation rates in a naturally ventilated dairy barn

Edouard

Mosquera

Dooren

et al. 2016

Biosystems Engineering

View full text Add to dashboard Cite

Air flow rate CO 2 mass balance Tracer gasLivestock production is a source of numerous environmental problems caused by pollutant gas emissions. In naturally ventilated buildings, estimating air flow rate is complicated due to changing climatic conditions and the difficulties in identifying inlets and outlets. To date no undisputed reference measurement method has been identified. The objective of this paper was to compare CO 2 -and SF 6 -based tracer gas methods for the estimation of ventilation rates (VR CO2 vs. VR SF6 ) in naturally ventilated dairy barns both under conventional and very open ventilation situations with different spatial sampling strategies.Measurements were carried out in a commercial dairy barn, equipped with an injection system for the controlled release of SF 6 , and measurement points for the monitoring of SF 6 and CO 2 concentrations to consider both horizontal and vertical variability. Methods were compared by analysing daily mean VR CO2 =VR SF6 ratios. Using the average gas concentration over the barn length led to more accurate ventilation rates than using one single point in the middle of the barn. For conventional ventilation situations, measurements in the ridge seem to be more representative of the barn average than in the middle axis. For more open situations, both VR CO2 and VR SF6 were increased, VR CO2 =VR SF6 ratios being also more variable. Generally, both methods for the estimation of ventilation rates gave similar results, being 10e12% lower with the CO 2 mass balance method compared to SF 6 based measurements. The difference might be attributed to potential bias in both methods.

show abstract

Development of a reference method for airflow rate measurements through rectangular vents towards application in naturally ventilated animal houses: Part 1: Manual 2D approach

Cited by 13 publications

References 30 publications

Evaluation of Actual Ventilation Rates and Efficiency in Research-Scale Pig Houses Based on Ventilation Configurations

Evaluation of Actual Ventilation Rates and Efficiency in Research-Scale Pig Houses Based on Ventilation Configurations

Assessing airflow rates of a naturally ventilated test facility using a fast and simple algorithm supported by local air velocity measurements

Comparison of CO2- and SF6- based tracer gas methods for the estimation of ventilation rates in a naturally ventilated dairy barn

Contact Info

Product

Resources

About