A refined protocol for calculating air flow rate of naturallyventilated broiler barns based on co2 mass balance Report as inadecuate




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This study was conducted to evaluate relatively simple protocols for monitoring ventilation rate VR in naturally-ventilated barns NVB. The test protocols were first applied to a mechanically-ventilated broiler barn MVB, where VR was estimated more accurately and then were used to calculate VR in the NVB. CO2 concentrations were measured with two different sampling schemes: S1 the average of indoor measurements along the length of the building at two heights of 0.5 m and 1.5 m from the litter floor; and S2 same as previous but with concentration measurements taken only at 0.5 m from litter. The dynamic metabolic CO2 production rate of the birds was predicted with two different algorithms: A1 remaining constant throughout the dark and light periods, and A2 varying with animal activity on an hourly basis. The results demonstrated that the combination of S2 with A1 or A2 yielded the best estimate of building VR in the NVB.

Tipo de documento: Artículo - Article

Información adicional: Derechos de autor reservados

Palabras clave: building ventilation rate, aerial emissions from broiler barns, CO2 mass balance, bland-altman chart





Source: http://www.bdigital.unal.edu.co


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http:--dyna.medellin.unal.edu.co- A refined protocol for calculating air flow rate of naturallyventilated broiler barns based on CO2 mass balance Un protocolo refinado basado en balance de masa de CO2 para el cálculo de la tasa de flujo de aire en instalaciones avicolas naturalmente ventiladas Luciano Barreto-Mendes a, Ilda de Fatima Ferreira-Tinoco b, Nico Ogink c, Robinson Osorio-Hernandez d and Jairo Alexander Osorio-Saraz e a c Facultad de Ciencias Agrarias, Universidad Federal Vicosa, Brasil.
luciano.mendes@ufv.br b Facultad de Ciencias Agrarias, Universidad Federal Vicosa, Brasil.
iftinoco@ufv.br Livestock Research Institute, Wageningen University and Research Center, The Netherlands.
nico.ogink@wur.nl d Facultad de Ingeniería Agrícola, Universidad Federal Vicosa, Brasil.
robinson0413@ufv.br e Facultad de Ciencias Agrarias, Universidad Nacional de Colombia, Colombia.
jdvelasq@unal.edu.co Received: May 9th, 2013.
Received in revised form: May 2th, 2014.
Accepted: May 22th, 2014. Abstract This study was conducted to evaluate relatively simple protocols for monitoring ventilation rate (VR) in naturally-ventilated barns (NVB).
The test protocols were first applied to a mechanically-ventilated broiler barn (MVB), where VR was estimated more accurately and then were used to calculate VR in the NVB.
CO2 concentrations were measured with two different sampling schemes: (S1) the average of indoor measurements along the length of the building at two heights of 0.5 m and 1.5 m from the litter floor; and (S2) same as previous but with concentration measurements taken only at 0.5 m from litter.
The dynamic metabolic CO2 production rate of the birds was predicted with two different algorithms: (A1) remaining constant throughout the dark and light periods, and (A2) varying with animal activity on an hourly basis. The results demonstrated that the combination of S2 with A1 or A2 yielded the best estimate of building VR in the NVB. Keywords: building ventilation rate; aer...





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