Studies on Ventilation and Sensible Heat Utilization in Dairy and Beef Cattle Barns. (I):Measurements of Water Vapor and Sensible Heat Productions in a Dairy Barn
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The amounts of water vapor and sensible heat productions were estimated from the analyses of heat and water vapor balances in an insulated and mechanical ventilated daily barn. The results were summarized as follows;(1) The amounts of water vapor production were stable values of approximately 30kg/h at the time of low ventilation rate when the only two fans moved but they were showed two patterns of values, higher and lower than 30kg/h, at the time of high ventilation rate when the five fans moved simultaneously. While, the amounts of sensible heat production were from 40, 000kcal/h to 50, 000kcal/h at the time of low ventilation rate, but at the instant when the ventilation rate changed from low rate to high rate it showed a pattern of high values reaching 70, 000kcal/h-100, 000kcal/h.(2) It was considered that the changes of the amounts of water vapor production at the time of high ventilation rate were apparent changes due to incomplete air mixing but the changes of the amounts of sensible heat production contained actual changes caused by the decrease of air temperature in addition to these apparent changes.(3) Both the amounts of water vapor and sensible heat productions were fluctuating in short time but their daily mean values were in agreement with the data of Yeck et al. (1959).(4) The mean convection heat transfer coefficient of the inner surface was 2.62kcal/m h°C and the mean overall coefficient of heat transmission of the structure was 0.273kcal/m h°C. The value of the mean overall coeficient were in agreement with the value obtained from R-value data of building materials.
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