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VELOCITY FIELDS AND CO2 DISTRIBUTION IN THE NEAR FLOOR REGIONS OF A ROOM WITH PIG-SIMULATORS AND PARTITION WALL
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: Pp. 048-055 in Swine Housings II Proceedings of the 12-15 October 2003 Conference (Research Triangle Park, North Carolina USA), Publication Date 12 October 2003. 701P1303.(doi:10.13031/2013.15468)
Authors: G. Zhang; S. Morsing; J.S. Strøm; B. Bjerg; K. Svidt
Keywords: airflow pattern, floor air velocity, CO2 distribution, non-isothermal ventilation
Air velocity fields and their effect on CO2 distribution in the near floor region were investigated in a full-scale ventilated room with pig simulators and a partition wall. The room was 10 m wide, 3 m high and 8.5 m long. The solid partition wall was 0.8 m high and 10 m wide spanning across the room 5 m from the ventilation inlet wall. Two rows each with 8 standing pig simulators and a row with 8 lying pig simulators were placed along the partition wall.
Four rectangular inlets with an elliptic profile in the contraction section were symmetrically installed in the inlet wall 0.5 m beneath the ceiling. The elliptic profile followed the ISO standard for a long-radius nozzle. The geometric opening of each inlet was 0.525 m wide by 0.05 m high pointing upwards 20° above horizontal towards the ceiling in order to provide an initial inclination of the jet.
During the experiments, a pressure difference of 10 Pa between the test room and the surrounding laboratory was maintained. This resulted in an inlet flow rate of 1480 m3/h equivalent to 5.8 air changes per hour. CO2 was injected into the room through a point source on the floor in the symmetric position 5.5 m from the inlet wall. The investigation covered both isothermal conditions with no heat for the pig simulators and non-isothermal conditions with heated pig simulators. In the isothermal conditions the pig simulators were maintained in the room with power off. In the non-isothermal experiments, the surface temperature of the pig simulators were kept at 39±1.5 °C with a power consumption of 5.8 kW. The room temperature was kept at 20±0.5 °C and the supply air temperature was about 10 °C lower than the room air temperature.
Measurements showed that the airflow patterns under isothermal and non-isothermal conditions were different due to the buoyancy created by the heated pig simulators. CO2 distribution was strongly related to the air motion and highly correlated to the airflow
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