• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Annual International Meeting of the American Society of Agricultural and Biological Engineers >Quantification of Air Exchange Rates and Gaseous Emissions throughout Naturally Ventilated Dairy Barns
【24h】

Quantification of Air Exchange Rates and Gaseous Emissions throughout Naturally Ventilated Dairy Barns

机译：空气汇率的量化和整个天然通风的乳制品谷仓的气态排放

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Animal husbandry is a major source of atmospheric emissions, e.g., ammonia, and methane. The quantification of emission flow has gained special attention in the recent years. But, in naturally-ventilated barns this quantification is still a difficulttask. A main issue is to estimate the air exchange rate (AER) of the barn, and then to quantify the emission flow. This study consisted of several trials conducted during mild and cold periods of the year in two naturally-ventilated dairy cattle barns located in northeast Germany. During the experiments, the concentrations of (NH_3, CH_4 and C02) as well as the temperature were measured outside and inside the barns. The wind speed and the wind direction outside the barns were recorded as well as the airspeed through the openings of the barns. The AERs were estimated according to three methods: concentration decay of radioactive isotope tracer-gas Krypton85 (~(85)Kr-M), the airspeed through the inlet openings (AS-M), and the CO_2 mass balance model (CO_2-M). The comparison was done by performing the Pearson correlation analysis and by developing a linear regression model. The AS-M showed a good correlation with CO_2-M in both barns as well as in the mild and the cold season (p<.0001). The AS-M overestimated the AER compared to CO_2-M with a gradient ranged between 1.02 and 1.55 (R2>0.80). A good correlation of the ~(85)Kr-M with the other both methods could not be found in all investigated cases due to the limited number of observations. Compared toCO_2-M, the ~(85)Kr-M overestimated the AER with a gradient ranged between 1.14 and 2.22 (R2>0.83). In barn A, the emission fluxes on the basis of the CO_2-M during the mild season were 14.6 ±13.2, 164 ±77 and 7,000 ± 2,900 g d~(-1)AU~(-1) forNH3, CH4, and C02, respectively. During the cold season, they amounted to 22.9 ± 14.7, 320 ±115 and 8,600 ± 2,000 g d~(-1)AU~(-1). In barn B, during the mild season they were 25.0 ± 13.5, 324 ± 147 and 8,800 ± 3,600 g d~(-1)AU~(-1) for NH_3, CH_4, and CO_2, respectively. During the cold season, they amounted to 34.5 ± 13.2, 466 ± 79 and 12,600 ± 0,800 g d~(-1)AU~(-1).
机译：畜牧业是大气排放的主要来源，例如氨和甲烷。近年来，排放流量的量化已经受到特别关注。但是，在自然通风的栏杆中，这种量化仍然是一个困难的摊位。主要问题是估计谷仓的空气汇率（AEN），然后量化排放流程。本研究由在位于德国东北部的两个天然通风的奶牛谷仓中进行了几项试验。在实验期间，在谷条外部和内部测量（NH_3，CH_4和CO 2）以及温度的浓度。记录谷仓外部的风速和风向，以及通过谷仓的开口的空速。根据三种方法估计AERs：放射性同位素的浓度衰减示踪剂 - 气体Krypton85（〜（85）KR-M），通过入口开口（AS-M）和CO_2质量平衡模型的空速（CO_2-M） ）。通过执行Pearson相关分析并通过开发线性回归模型来完成比较。 AS-M表现出与两条谷仓中的CO_2-M以及温和和寒冷季节（P <.0001）中的良好相关性。与CO_2-M相比，AS-M高估了，梯度范围为1.02和1.55（R2> 0.80）。由于观察数有限，〜（85）KR-M与其他两种方法的良好相关性在所有调查的病例中都找不到。比较TOCO_2-M，〜（85）KR-M高估，梯度范围为1.14和2.22（R2> 0.83）。在谷仓A中，在轻度季节的CO_2-M基于CO_2-M的排放通量为14.6±13.2,164±77和7,000±2,900 gd〜（-1）Au〜（-1）FornH3，CH4和C02，分别。在寒冷的季节期间，它们达到22.9±14.7,320±115和8,600±2,000g d〜（-1）Au〜（-1）。在谷仓B中，在轻度季节，它们分别为25.0±13.5,324±147和8,800±3,600g d〜（-1）Au〜（-1），用于NH_3，CH_4和CO_2。在寒冷的季节期间，它们达34.5±13.2,466±79和12,600±0,800g d〜（-1）au〜（-1）。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号