major problem in Mediterranean areas during hot season is the dairy cows exposition to solar radiation and high ambient temperatures. A micro-environment evaporative cooling system was built up by foggers which disperse a very fine droplet of water which quickly evaporates, cooling the surrounding air and raising the relative humidity in the process. Coolers are positioned every 15 meters or so in the roof of the barn, above zones frequented during the daylight, to minimize heat stress on animals. The aim of this work was to evaluate the effectiveness of the high pressure fogger system in an open-sided barn, and to set up a simulation model. The open-sided barn is located in Viterbo District and, during summer season in 2004, temperature and humidity measures were taken under the roof, between coolers at feeding zone, and outdoor. Solar radiation was measured as well. The analysis of data pointed out that the cooling system design was able to consistently reduce peak air temperatures by 6 °C or more. In comparison with the plain provision of shade it is a remarkable result. Applying a simulation software called TRANSINUS, previously set up by authors, temperatures inside the barn were predicted with good reliability. Evaporative cooling effects on ambient temperature were predicted by a linear regression calculated across the monitored period.
LA PROTEZIONE DAGLI ECCESSI TERMICI DELLE BOVINE DA LATTE IN STABULAZIONE LIBERA
BIBBIANI, CARLO
2005-01-01
Abstract
major problem in Mediterranean areas during hot season is the dairy cows exposition to solar radiation and high ambient temperatures. A micro-environment evaporative cooling system was built up by foggers which disperse a very fine droplet of water which quickly evaporates, cooling the surrounding air and raising the relative humidity in the process. Coolers are positioned every 15 meters or so in the roof of the barn, above zones frequented during the daylight, to minimize heat stress on animals. The aim of this work was to evaluate the effectiveness of the high pressure fogger system in an open-sided barn, and to set up a simulation model. The open-sided barn is located in Viterbo District and, during summer season in 2004, temperature and humidity measures were taken under the roof, between coolers at feeding zone, and outdoor. Solar radiation was measured as well. The analysis of data pointed out that the cooling system design was able to consistently reduce peak air temperatures by 6 °C or more. In comparison with the plain provision of shade it is a remarkable result. Applying a simulation software called TRANSINUS, previously set up by authors, temperatures inside the barn were predicted with good reliability. Evaporative cooling effects on ambient temperature were predicted by a linear regression calculated across the monitored period.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
