| Autor: |
Andrade RR; Federal University of Viçosa, Agricultural Engineering Department, Av. Peter Henry Rolfs, s/n, Campus Universitário, 36570-900 Viçosa, MG, Brazil., Tinôco IFF; Federal University of Viçosa, Agricultural Engineering Department, Av. Peter Henry Rolfs, s/n, Campus Universitário, 36570-900 Viçosa, MG, Brazil., Damasceno FA; Federal University of Lavras, Engineering Department, Av. Doutor Sylvio Menicucci, 1001, Aquenta Sol, 37200-000 Lavras, MG, Brazil., Ferraz GAS; Federal University of Lavras, Engineering Department, Av. Doutor Sylvio Menicucci, 1001, Aquenta Sol, 37200-000 Lavras, MG, Brazil., Freitas LCSR; State University of Maringá, Department of Agricultural Engineering, Campus do Arenito, 87820-000 Cidade Gaúcha, PR, Brazil., Ferreira CFS; Federal University of Viçosa, Agricultural Engineering Department, Av. Peter Henry Rolfs, s/n, Campus Universitário, 36570-900 Viçosa, MG, Brazil., Barbari M; University of Florence, Department of Agriculture, Food, Environment and Forestry, Via San Bonaventura, 13, 50145 Firenze, Italy., Teles Junior CGS; Federal Rural University of the Amazon, Institute of Agricultural Sciences, Av. Perimetral, Terra Firme, 19702-054 Belém, PA, Brazil. |
| Abstrakt: |
In this study, we aimed to assess the spatial variability of microclimate inside a closed compost-bedded pack barn (CBP) with a negative ventilation system during summer and winter. The research was carried out in a CBP located in the Zona da Mata region, Minas Gerais, Brazil. For each of the stations analyzed, the following environmental mean variables observed inside a CBP were measured: air dry-bulb temperature (tdb), air relative humidity (RH), and windspeed, Temperature-Humidity index, and specific enthalpy. The kriging maps showed that the most critical housing conditions in the thermal environment were found, mainly, from the central part of the CBP, close to the exhaust fans. The analyses also pointed out that the system presented temperature gradients along the length, up to 3°C. During the summer afternoon, the entire region of the CBP was in a discomfort situation (tdb>26°C; RH>75%). During the winter, the measured environmental data remained within the comfort zone throughout the facility. However, probably due to the lack of thermal insulation of the material used to close the sides of the CBP, it did not allow spatial thermal uniformity for both seasons. It was also inefficient to keep the animals within the comfort zone for lactating cattle during the critical summer period. |
