使用差分压力计来测量堆栈效果
andris spulte.| Posted inEnergy Efficiency and Durabilityon
差分压力计可以用来测量堆栈效果吗？我认为一个软管将留在一楼（或地下室），另一个软管将在第二张故事中留在第2层。
Will the elevation difference of the open ends affect the reading? Or does that net out, since it’s an open system on both hoses?
Any suggestions on a budget model to buy? Or would an inclined water manometer do the trick?
要么even the iPhone’s built in barometer? (100 Pa is about 27′, and I’ve heard it measures stair climbing, so it might work)
我正在考虑使用它在平衡HRV时看到压力差异，以及通过使用我们的厨房通风口的虚拟“鼓风机门”，然后测量打开/关闭/密封东西的效果......
Thoughts?
GBA详细资料库
A collection of one thousand construction details organized by climate and house part
搜索和下载施工细节
Replies
这种设置将测量两个位置之间的压差，但不能直接转换为没有大量其他信息的空气运动（如立方英尺）的速率。我不认为单独的压差特别有用。
账单
嗨比尔，
Thanks for chiming in. Sure, it won't be as accurate as a proper blower door test, but should give some actionable data.
尽管它会开始变得压力!和5月be a smoke stick... Looks like some iPhone barometer apps read down to .01 hPa (10 Pa), so at least it's something... Any suggestions on a real gauge that won't break the bank? None of the $40-$100 ones on Amazon get down to single Pa unit resolution. I'd prefer digital, but maybe a magnehelic with a ±.25"H2O range will be it...
这是我的推理 - 我在十年前做了一个鼓风机门测试（1610 CFM @ 50Pa，大约90平方英尺的漏洞区域）。如果我催化了600 CFM厨房的排气扇和浴缸，我希望在房子里获得一个明显的压力。我可以打开一个窗户打开（已知尺寸，添加泄漏面积），看看压力差异是什么，并在泄漏时获得粗略的数量级，因为我打开或密封东西......
https://www.greenbuildingadadadisor.com/article/donaluture-diagnostics-part-iii.
By doing zonal pressure diagnostics, it should show (grossly) where the leakage is worst. If I take an attic crawlspace (gable vents on our dormered cape) vs 2nd floor differential pressure reading, it'll show proportionally what the leakage area is (what comes in, must go out) compared to the inside. Same with the basement vs 1st floor. Is most of my leakage open sill plate to the basement? Or top plate / walls to the crawlspace attic? I figured it'll help steer what I need to improve next.
I was also curious where my neutral pressure plane is, as well as if it makes sense to run the HRV unbalanced against stack effect (I'm thinking exhaust intakes on the first floor and fresh air delivery to the 2nd floor bedrooms).
或者也许这只是磨刀铅笔的练习，因为我应该密封搭扣板，带托梁，顶板无论如何......
I would look at the Magnehelic gauges, which are commonly available on Ebay with inches of water scale (which you can easily convert to other units if needed).
我同意，如果您有一个特别泄漏的房间，与其他区域相比，它会略微较低，但差异将受到任何连接空间的反对的影响。我想你会发现它很难在这里实际获得可用的数据。鼓风机门测试没有根据压力寻找泄漏，您可以使用烟囱寻找泄漏。压力读数只是在特定压力下为您提供一种整体建筑泄漏数，以允许与其他地方进行比较。
虽然由于泄漏而泄漏的房间将略低的理论是真的，但我认为这落入了“理论就像眼镜上的薄雾的理论：晦涩的事实”:-)
账单
Larry Janesky does it in this video:https://youtu.be/a3rKGMIqWis
删除了
我认为这不会工作，至少在仍然空气中。堆叠效应是由升温空气上升和冷空气落的浮力引起的。但这都是空气。当您为压力计运行管道时，它暴露在与房间内的空气相同的条件，并且管内的空气将迅速接近局部室温。因此，管中的空气将具有与房间内的空气相同的浮力。压力计没有净压差，无论你在房子里放在哪里。
You could do this measurement by using outdoor air as a reference though, because it will generally have better mixing and little or no temperature stratification. Measure the basement compared to outside and the upstairs compared to outside. Best would be to use two manometers and take the measurements at the same time.
当您描述上面时，您当然可以使用厨房粉丝作为穷人的鼓风机门。凭借恒定的强制压力差，您可以使用压力计来检查房间到房间或相对于室外的任何或所有房间的差分压力。凭借一些勤奋，您当然可以找到最大泄漏的区域，并旨在首先密封这些区域。当您这样做时，烟雾会非常方便，因为它可以帮助确定许多泄漏的确切位置。
I agree - there had to be some airflow from basement to upstairs in the video in #3. This airflow restricted by the closed basement door created the pressure difference.
In a perfectly still/sealed house (no flow) with the basement open to upstairs, it wouldn't measure any upstairs/basement pressure difference - so measure interior to exterior.
>它将帮助引导我接下来需要改进的东西。
I suspect that it's easier and more effective to fill the house with smoke, pressurize it and then look where the most smoke is coming out.
有些人会说“但是在中性压力平面上泄漏并不重要”。但考虑风，他们做了。