Ventilation Effects on the Ridge-Vent Beef Housing
1980 Volume 11 Issue 1 Pages 8-14
Details
1980 Volume 11 Issue 1 Pages 8-14
The ventilation effects on the ridge vent beef housing were studied by measuring outlet air speeds and other parameters in winter (Feb., 24-25 1979) and in summer (Aug., 8-9 1979).
The results obtained from this study were summarized as follows:
1) The correlation between the air discharge through open ridge and the wind speed was observed for winter observation. But it was not clear in summer observation.
2) The air discharges through open ridge under the condition of only temperature difference were approximately 230m3/min. (7.1 air changes/h) for winter observation and 200m3/min. (6.3 air changes/h) for summer obsevation. The pressure differences between inside and outside of the open ridge for winter and summer observations were estimated at 8.05×10-2kg/m2 and 3.98×10-2kg/m2, respectively.
3) The measured discharge coefficient of the open ridge was ranging from 0.57 to 0.97, the mean value of it was 0.77.
4) The calculation of vapor balance has revealed that the total ventilation rates were approximately 15 air changes/h for winter observation and 39 air changes/h for summer observation.
5) The ratios of ventilation rate through the open ridge to total ventilation rate were 0.48 for winter observation and 0.16 for summer observation.
