5-最小通风系统解析

Always seal from outside
一定要在舍 外进行密封
Cold Air Leakage at Catching Door 鸡舍末端大门漏入冷空气

Sealed vs. Unsealed Side Wall 密封良好对比没有密封的边墙


Sealed vs. Unsealed Side Wall 密封良好对比没有密封的边墙
应激，饲养密度，均匀度，鸡群健康，育雏开端不良
• Cold drafts onto the heater probe 贼风吹到供热器的感应探头 • Heat loss through the cracks and openings 缝隙损失热能 • No mixing of cold incoming air with warm inside air
鸡舍的密封与保温
• Regardless of the type of ventilation system, it is important to seal the house
无论哪种类型的通风系统，密封鸡舍至关重要。
• Gives better control over what is happening inside
Potential Solutions to Managing Curtain/Leaky Houses 管理卷帘/漏风鸡舍的方法
• SEAL THE HOUSE!! (minimal cost, huge impact)
把鸡舍密封起来！（最低成本，巨大影响）
– Make sure curtains seal 确保卷帘密封 – Seal around doors 密封门和框周边 – Seal eave of the roof 密封屋檐 – Seal all joints in the roof 密封屋顶所有联接处 • Roof insulation (summer and winter benefit) 屋顶保温（利于冬夏） • Review your heating system (type and capacity) 评估供暖系统 型
排风扇
Fan Jet System 鼓风机系统
Advantages: 优点： • “Positive pressure” system “正压”系统
• House does not have to be extremely well sealed 没必要完全密封 • Fan jet runs continuously → good mixing of air and heat 鼓风机连续 运转 – 可很好地混合舍内空气和热能 • Incoming air directed up away from birds 进入鸡舍的空气不会吹到鸡 只身上 • Heating system can be located at FJ for distribution 供热系统可以放 到鼓风机系统便于均匀分布 • Relatively cheap system 相比之下费用较低的系统


Chick Spread – Uninsulated, Poor Seal 鸡群分布状况 – 没有保温，密封差

Chick Spread – Insulated, Sealed 鸡群分布状况 – 保温密封良好

House Leakage, Cold Floors 鸡舍漏风，地面寒冷
Wasted Heat
When Do We Use Min Vent?
我们什么时间使用最小通风系统?
• It can be used summer and winter 冬夏均可使用 • It is used anytime the actual house temperature is below the required set point temperature for the birds 只要舍内温度低于鸡 舍所设定温度时就可使用。 • It is used when trying to maintain temperature, but still putting the least amount of fresh air possible to maintain good air quality 只有在又要保持舍内温度，又需要少量的新鲜空气保持舍内 良好空气质量时就可使用。 • When the house temperature goes above the required set point temperature, then it is no longer in minimum ventilation mode 鸡舍温度高于所设定的温度时，无需再使用最小通风系统。
进入的冷空气不能与舍内的热空气混合 不能达到顶棚高度存在的热空气
• Unable to access the heat in the peak of the roof High heating costs, can’t maintain temperature
供热能源成本高并无法保持舍内温度
Poor Sealing 密封差
处于热平衡局域时氧气的需求量最低。
• As environmental temperature decreases, oxygen demand increases 随着环境温度降低，氧气需求量上升。
– You cannot compromise ventilation for temperature 切不可为保全温度而牺牲通风
风系统 – 看下面例证。
• Circulation fans can help to distribute heat (but they are NOT a substitute for minimum ventilation) 循环风机有助于均匀分布舍内热能 （但绝不能取代最小通风系统）
Radiant Heating
热能浪费
Cold floors, wet litter, heater activated
地面寒冷，垫料潮湿，加热器满负荷运转
Curtain Leakage on a Windy Day 有风日卷帘漏风
Air Leakage Through a Poorly Sealed Curtain
卷帘密封差存在漏风现象
能
– Radiant heaters put the heat where the chicks need it 加热器位置 • Review your heat distribution 审核舍内供暖分布情况 • Preheat the house for at least 2-3 days 至少提前2-3天预热鸡舍 • Make sure floors are warm before chicks arrive 确保雏鸡入舍前地面温度暖和适宜。
可更好地掌控鸡舍内的情况。
• Reduces the effect of outside conditions
降低鸡舍外部条件的影响。
• Gives you more control over the incoming air
可更好地控制进入鸡舍的空气。
• Insulation keeps heat in during winter
冬季可保存鸡舍内的热量。
• Insulation keeps heat out during summer
夏季可隔绝外部的热量。
Problems With Poorly Sealed Houses
鸡舍密封差所带来的问题
• Cold floors due to drafts 贼风而造成的地面寒冷 • Cold drafts onto the chicks 贼风侵扰鸡只 • Can’t maintain temperature in winter 冬季无法保持舍内温度 • Can’t ventilate effectively in winter 冬季无法做到有效通风 Stress, stocking density, uniformity, health, poor start
MINIMUM VENTILATION
最小通风系统
September 2011
Bernard Green
Discussion Topics 讨论题
• • Why we ventilate 为什么要通风？ When do we use minimum ventilation? 什么时间使用最小通 风系统？ Bird requirements 鸡只需求 Effects of temperature on oxygen demand 温度对氧气需求 的影响 House sealing and insulation 鸡舍的密封与保温隔热 Problems with poorly sealed houses 鸡舍密封差的问题 Potential solutions to managing curtain/leaky houses 管理卷 帘/漏风鸡舍的建议方法 What is negative pressure 什么是负压？ Why it is important 为什么很重要？ Minimum ventilation system 最小通风系统 Minimum ventilation rate 最小通风量 Evaluating minimum ventilation 评估最小通风
Transition and Tunnel Ventilation 过渡通风或纵
向通风系统
Set Point Temperature温度设定点 Minimum Ventilation 最小通风系统
Bird Requirements 鸡只需求
• • • • • Warm floor during brooding 育雏期地面要暖和 Good air quality (oxygen) 空气质量良好（氧气） No temperature fluctuations 无温度高低起伏 No drafts 无贼风 No environmental stresses 无环境应激
• When environmental temperature increases and the bird begins to pant, oxygen demand increases 环境温度上升时，
鸡只开始张嘴喘气，氧气需求量上升。
House Sealing and Insulation
• It doesn’t matter what type of housing you have! 不管您有
什么类型的鸡舍都无所谓
• These are the bird requirements 这些就是鸡只的需求
Effects of Temperature on Oxygen Demand 温度对氧气需求的影响 • Oxygen demand is lowest when the environment allows the chick to be in its thermoneutral zone 环境条件允许鸡只
Potential Solutions to Managing Curtain/Leaky Houses 管理卷帘/漏风鸡舍的方法
• Fan Jet system – explained below 鼓风机系统-下面解释 • Install minimum ventilation – examples below 安装最小通
辐射热加热器
Hale Waihona Puke Baidu
Puts heat where needed, on the floor
安置在需要的地方，地面等
Fan Jet 鼓风机
Inlet Damper
进风口导流板
Fan Jet 鼓风机
Fan Jet System 鼓风机系统
Fan Jet
鼓风机
Plastic Tube
塑料通风管
Exhaust Fan
• •
• • • • • • • •
Why We Ventilate 我们为什么要通风？
We ventilate to: 我们通风的目的是： • Create an air exchange 创造空气交换 • Control moisture levels 控制湿度水平 • Control the heat load 控制热量水平 • Control the effective temperature (T + RH + air speed) 控制有效温度（温度+相对湿度+空气速度） • Supply oxygen 提供氧气 • Remove harmful gases 排除有害气体