Measurement of Thermal Environment Uniformity within High Density Stacked-Cage Layer House
High density laying hen production system using eight stacked cages and manure belt is becoming popular in China.Although the system is widespread in USA and some other western countries, it is relatively new in China.The distributions of ventilation and thermal environment within the production facilities are still of big concerns due to the extensive barn size and high bird density.In this study, a field test was carried out to measure the temperature, wind speed,carbon dioxide concentration and their distributions within a newly built barn with cross ventilation system in Shanxi Province in January 2015.The thermal environment was evaluated based on these measurements.The results showed that for horizontal direction, the average temperature variations were 5.67±0.46℃, 2.76±0.29℃, and 3.11±0.49℃ at the first, fifth, and seventh cage heights, respectively.For vertical direction, the temperature variations between first and 8th cage heights were 3.63±0.72℃, 1.30±0.46℃, and 4.09±1.44℃ at the cooling pad,middle of the house, and exhaust fan sections, respectively.The highest diurnal temperature difference was as high as 9℃.The average wind speed at the exhaust fan and first cage height areas were too high: 0.36±0.07 m/s and 0.32±0.07 rn/s respectively, which were both higher than the recommended threshold of 0.25 m/s.This paper provides an evaluation of environmental control technology and management in a high density stacked-cage-raising layer house.
Temperature variation air velocity carbon dioxide comfort
Qiongyi Cheng Baoming Li
Key Laboratory of Structure and Environment in Agricultural Engineering, Ministry of Agriculture,China Agricultural University, Beijing 100083, China
国际会议
The 2015 International Symposium on Animal Environment and Welfare(动物环境和福利国际研讨会)
重庆
英文
80-87
2015-10-23（万方平台首次上网日期，不代表论文的发表时间）