1987 Volume 18 Issue 1 Pages 15-27
The ventilation rates and the heat utility ratios based on the heat and moisture balances were compared in three types of livestock barns: the insulated and mechanical ventilated dairy barn and the naturally ventilated livestock barns of the ridge-vent beef barn and the monitor-roof dairy barn. The results were summarized as follows;
(1) In the insulated and mechanical ventilated dairy barn, the sensible heat utility ratios for ventilation and inside storage were higher than that of the other in winter observation. The phenomenon of that the heat which was stored into the building materials discharged to the inside air was observed at the time of high ventilation rate and low inside air temperature. In summer observation, the ventilation rates were relatively less than the other.
(2) In the naturally ventilated beef and dairy barns, it was observed in summer that the differences of inside and outside air temperatures were less than that of the insulated and mechanical ventilated dairy barn in spite of getting a large amount of heat through the structur. It was became clear that these barns had the characteristic of excellent ventilation.
(3) It was proved from these results that the insulated livestock barns with mechanical ventilation system were fit for cold climate regions, and the ridge-vent and monitor-roof livestock barns with naturally ventilation system were fit for warm climate regions or for species of animal which did not need warming in winter season.
