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Improvement of the ventilation system of a naturally ventilated broiler house in the cold season using computational simulations

Cited 45 time in Web of Science Cited 59 time in Scopus
Issue Date
2009
Publisher
Elsevier
Citation
Biosystems Engineering, 104, 106-117
Keywords
CFDbroiler houseventilation efficiencycomputational simulation
Abstract
Limited measurement points and unpredictable airflows, as well as uncontrollable weather
conditions, make conducting field experiments to study ventilation in broiler houses very
difficult. Simulations using computational fluid dynamics (CFD) are often used to overcome
the above mentioned limitation. In this study, airflow, internal air temperature distribution
and ventilation efficiency of a conventional ventilation system and several modified ventilation
systemswere analysed bothquantitativelyand qualitatively using a previously developed
CFD model. These analyses were conducted in order to enhance the rearing condition of the
conventional, natural ventilated broiler houses. A tracer gas decaymethod was adapted to the
CFD main solver utilising a user-defined function to calculate the ventilation efficiency and
building energy simulation (BES) method was used to compute the heating load. In order to
replicate the ventilation problems encountered during the field experiment, the various
ventilation systemswere studied in the cold season with four different types of vent openings:
a chimney, a side vent, a pipe under the roof and a side-up vent at the eaves. From the CFD
results, the optimum results were obtained with a model that used a diffuser beneath the
chimney inlet which mixed the incoming cold air with the warm air that had accumulated in
the upper portion of the broiler house.An additional curtain installed close to the internal side
wall effectively guided exhaust gas to the outlet vents and introduced the incoming fresh air to
the broiler zone. The curtain also enhanced the thermal insulation at the side wall. Because of
its high ventilation efficiency in the broiler zone, compared with a conventional broiler house
there was a 32% increase in the thermal uniformity and a 14% increase in the thermal suitability.
The BES results indicated that the model could save 47% of the energy input at the
broiler zone compared to the conventional ventilation system. An additional field experiment
demonstrated that an upgraded broiler house adapted to themodel saved 30%of energy costs.
ISSN
1537-5110
Language
English
URI
https://hdl.handle.net/10371/37327
DOI
https://doi.org/10.1016/j.biosystemseng.2009.05.007
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