...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Biosystems Engineering >Air exchange rate measurements in naturally ventilated dairy buildings using the tracer gas decay method with 85Kr, compared to CO2 mass balance and discharge coefficient methods. (Special Issue: Emissions from naturally ventilated livestock buildings.)
【24h】

Air exchange rate measurements in naturally ventilated dairy buildings using the tracer gas decay method with 85Kr, compared to CO2 mass balance and discharge coefficient methods. (Special Issue: Emissions from naturally ventilated livestock buildings.)

机译：与CO 2 质量平衡和排放系数方法相比，使用 85 Kr示踪气体衰减法测量自然通风的奶牛场中的空气交换率。 （特刊：自然通风的牲畜建筑物的排放。）

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

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

摘要

Emission fluxes from naturally ventilated cattle buildings are usually calculated as the product of gas concentrations and the air exchange rate (AER). One key issue is the measurement of the AER throughout such buildings. The aim of this study was to investigate three different methods for AER estimation in naturally ventilated dairy buildings: (1) the concentration decay of the tracer gas Krypton85 using two different evaluation procedures, (1a) sum85Kr, in which the impulses from all the single 85Kr sensors are combined into one cumulative curve and (1b) ave85Kr, which averages the AERs obtained from single 85Kr sensors; (2) the carbon dioxide mass balance model (CO2M); and (3) the discharge coefficient method (DCM). These three methods were compared with each other using both our own measurements and results from the literature. The comparison was statistically evaluated using analysis of variance (ANOVA). The effects of the external conditions of wind velocity and temperature and the effect of nearby buildings on the differences between the methods were predicted. The concentration decay of 85Kr and the DCM generally produced higher AER values than the CO2M (mean+or-standard error (SE), 22.8+or-7.2 h-1). These differences were determined to be 8.5+or-3.1 h-1 (P=0.007) for the sum85Kr method and 12.9+or-3.1 h-1 (P<0.0001) for the DCM. The concentration decay of 85Kr can also be used to estimate higher AER ranges when the difference between the CO2 concentrations inside and outside the building is below 200 ppmv. The sum85Kr method is the recommended procedure for tracer decay analysis for AER estimation.
机译：通常将自然通风的牛舍的排放通量计算为气体浓度和空气交换率（AER）的乘积。一个关键问题是整个此类建筑物中AER的测量。这项研究的目的是研究在自然通风的奶牛场中三种不同的AER估算方法：（1）使用两种不同的评估程序对示踪气体K 85 的浓度衰减，（1a）sum < sup> 85 Kr，其中来自所有单个 85 Kr传感器的脉冲合并为一条累积曲线，而（1b）ave 85 Kr取平均值从单个 85 Kr传感器获得的AER; （2）二氧化碳质量平衡模型（CO 2 M）; （3）放电系数法（DCM）。使用我们自己的测量结果和文献结果，将这三种方法相互比较。使用方差分析（ANOVA）对比较进行统计评估。预测了风速和温度的外部条件的影响以及附近建筑物对方法之间差异的影响。 85 Kr和DCM的浓度衰减通常比CO 2 M产生更高的AER值（均值或标准误差（SE），22.8 +或-7.2 h -1 ）。对于sum 85 Kr方法，这些差异被确定为8.5+或-3.1 h -1 （P = 0.007）和12.9+或-3.1 h - DCM为1 （P <0.0001）。当建筑物内外的CO 2 浓度之差低于200 ppmv时， 85 Kr的浓度衰减也可用于估计较高的AER范围。 sum 85 Kr方法是用于AER估计的示踪衰减分析的推荐程序。

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