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陈昭辉,安捷,王金环,刘继军,杨食堂.南方夏季肉牛舍湿帘风机负压通风系统降温效果[J].农业工程学报,2018,34(21):208-214.DOI:10.11975/j.issn.1002-6819.2018.21.025
南方夏季肉牛舍湿帘风机负压通风系统降温效果
投稿时间:2018-07-22  修订日期:2018-09-23
中文关键词:  风机  降温  风速  湿帘  负压通风  肉牛舍
基金项目:国家重点研发计划项目(2016YFD0500508)
作者单位
陈昭辉 1. 中国农业大学动物科技学院北京 1001932. 动物营养学国家重点实验室北京 100193 
安捷 1. 中国农业大学动物科技学院北京 1001932. 动物营养学国家重点实验室北京 100193 
王金环 1. 中国农业大学动物科技学院北京 1001932. 动物营养学国家重点实验室北京 100193 
刘继军 1. 中国农业大学动物科技学院北京 1001932. 动物营养学国家重点实验室北京 100193 
杨食堂 3. 高安市裕丰农牧有限公司高安 330800 
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中文摘要:为改善南方夏季肉牛舍环境条件,该文对湿帘风机负压通风系统在肉牛舍的降温效果进行了探究。试验以栓系饲养西门塔尔公牛为试验对象,对环境、肉牛生理及增重情况进行测定。结果表明:降温后,试验舍平均温度降低3.2 ℃(P<0.01),相对湿度增加21.3%(P<0.01),肉牛附近风速增加0.30 m/s(P<0.01),肉牛体感温度降低1.8 ℃(P<0.01);试验牛呼吸频率平均降低13次/min(P<0.01),皮温降低0.92 ℃(P<0.01),平均日增质量提高0.13 kg/d(P>0.05)。由此可知,在肉牛舍中采用湿帘风机负压通风系统进行降温,能够有效改善舍内热环境,有助于缓解肉牛热应激,具有技术可行性。
Chen Zhaohui,An Jie,Wang Jinhuan,Liu Jijun,Yang Shitang.Cooling effects of fan-pad negative pressure ventilation system on summer environmental conditions in beef cattle barn in Southern China[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(21):208-214.DOI:10.11975/j.issn.1002-6819.2018.21.025
Cooling effects of fan-pad negative pressure ventilation system on summer environmental conditions in beef cattle barn in Southern China
Author NameAffiliation
Chen Zhaohui 1. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
2. State Key Laboratory of Animal Nutrition, Beijing 100193, China
 
An Jie 1. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
2. State Key Laboratory of Animal Nutrition, Beijing 100193, China
 
Wang Jinhuan 1. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
2. State Key Laboratory of Animal Nutrition, Beijing 100193, China
 
Liu Jijun 1. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
2. State Key Laboratory of Animal Nutrition, Beijing 100193, China
 
Yang Shitang 1. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
2. State Key Laboratory of Animal Nutrition, Beijing 100193, China
 
Key words:fans  cooling  wind speed  pad  negative pressure ventilation  beef cattle barn
Abstract: Although fan-pad evaporative cooling system is a kind of energy-saving and environment-friendly cooling method, its application in beef cattle barn is still very rare. A negative pressure ventilation system for wet curtain fan was tested in this study to improve the summer environmental conditions of beef cattle barn in Southern China and find out its suitability for hot and humid climates. The study was conducted in 2 cattle beef barns located at Gao'an, Jiangxi Province, where is hot and humid in summer. The system consists of a cellulosic cooling pad and 4 axial flow fans with an air volume of 38 048 m3/h and an electric power of 1.1 kW. According to the results of the preliminary experiment, the operation time of the cooling system was from 09:00 to 19:00. In this study, simmental beef cattle were randomly allotted in 2 confined barns where feed and water were freely available. The data of environmental factors and beef physiology were collected. Temperature-humidity-velocity index (THVI) and heat load index (HLI) value were calculated to estimate the effects of climatic variable and heat accumulation. The cooling effect of the system was affected by the ambient temperature and relative humidity. With the ambient temperature increased by 1 ℃, the cooling effect increased by 0.6 ℃; with the relative humidity increased by 10%, the cooling effect decreased by 1.6 ℃ There was a temperature gradient along the airflow direction, and the temperature increased 0.033 ℃ for every 1 meter increase in the distance from the cooling pad. The air velocity parallel to the direction of the air?ow was also inconsistent. The air velocity near the cooling pad was higher than that at the fan outlet and the middle area (P<0.01), and the air velocity of the outlet of the fan was higher than that at the middle area (P<0.01). During the measurement period, the average temperature in the experiment barn was (29.7±0.5) ℃, compared with the control barn, decreased by 3.2 ℃ (P<0.01); the average relative humidity was (89.9±1.9)%, increased by 21.3% (P<0.01); the average air velocity near the cow was (0.75±0.02) m/s, increased by 0.30 m/s (P<0.01); the average effective temperature was (29.1± 0.4) ℃, decreased by 1.8 ℃(P<0.01); the average concentration of CO2 was (498±14) (10(6, deceased by 44 (10(6 (P<0.01) ; and the average concentration of NH3 was (3.63±0.33) (10(6. However, because of the high relative humidity, HLI value of the experiment barn was slightly higher than that of the control barn(P>0.05). The average respiration rate in the experiment barn was (57±1)breaths/min, compared with the control barn, decreased by 13 breaths/min (P<0.01); the average skin temperature was (35.54±0.09) ℃, decreased by 0.92 ℃ (P<0.01); the average rectal temperature was (38.74±0.04) ℃, decreased by 0.11 ℃ (P>0.05); and the average daily weight gain was (0.65±0.52) kg/d, increased by 0.13 kg/d (P>0.05). The results indicated that fan-pad evaporative cooling system was able to improve the environmental conditions for beef cattle barns in Southern China, thus relieving heat stress of beef cattle. This provides a scienti?c basis for the extension and application of evaporative pad cooling systems in Southern China.
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