关于多层放舍的联合通风系统的CFD调查
Changzeng Hu1,2,3, Lihua Li1,2,3, Yuchen Jia1,2,3
1College of Mechanical and Electrical Engineering, Hebei Agricultural University, Baoding 071000, China.
Animals : an open access journal from MDPI
|September 14, 2024
概括
一个新的组合正压和负压通风系统 (PNCV) 改善了产卵中的环境控制. 与传统的负压通风 (NPV) 相比,该系统提高了空气速度,减少了温度差异和湿度.
科学领域:
- 农业工程 农业工程
- 环境控制系统环境控制系统
- 动物养殖 动物养殖
背景情况:
- 机械通风对于多层产卵子的环境控制至关重要.
- 目前的负压通风 (NPV) 系统表现出显著的温度差异和不均的空气分布.
- 这些限制会对产卵母的福利和生产力产生负面影响.
研究的目的:
- 设计和分析一种用于产卵的新型组合正压和负压通风系统 (PNCV).
- 解决现有的NPV系统的缺点,特别是温度分层和空气流统一性.
- 评估PNCV系统在改善籠區 (CZ) 內關鍵環境參數方面的有效性.
主要方法:
- 一个结合正压和负压通风 (PNCV) 系统是基于质量保存原理设计的.
- 使用计算流体动力学 (CFD) 模拟来分析环境参数.
- 模拟评估了气流分布和温度/湿度变化,不同正压风扇进气角度 (45°,90°,30°).
主要成果:
- PNCV系统增加了CZ的平均空气速度,其值从0.99 m/s到1.28 m/s不等,相比之下,NPV的0.94 m/s.
- 与NPV (4.46°C) 相比,CZ的最大温度差异在PNCV (1.80°C3.78°C) 减少.
- 使用PNCV,相对湿度保持在80%以下,而使用NPV,相对湿度保持在80%~85%.
结论:
- 拟议的PNCV系统有效地增强了垂直空气流,从而产生了显著的冷却和除湿效应.
- 在减少温度差异和保持最佳湿度水平方面,PNCV表现优于NPV.
- 这种创新的通风策略提供了一个有效的解决方案,用于精确的环境管理在密集的产母的住房.
相关概念视频
01:20Assessment of Ventilation I: Respiratory Rate
Assessment of Ventilation
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
01:26Masonry Cavity Walls
Cavity walls feature a hollow space between the outer and inner wythes, connected only by corrosion-resistant metal ties. When water seeps through the outer wythe, it descends within this cavity, intercepted by flashing and eventually exiting through weep holes. To enhance moisture resistance, the inner wythe's cavity side often receives damp-proofing, doubling as an air barrier. The cavity can also house insulation to mitigate heat transfer.
Maintaining a clean cavity during construction is...
Maintaining a clean cavity during construction is...