Sizing a Heat-Recovery Ventilator (HRV)
GBA Editor| Posted inGeneral Questionson
> My new house with in-floor radiant and basement is approximately 28,000 cubic feet. I calculated a 200 cfm HRV unit:
立方英尺的房子= 28,000
28,000 x .85 (to account for interior walls and furniture) = 23,800
23,800 x .5 (air change rate) = 11,900
11900/60 (cfm将每小时换气次数)= 198.33
> My HVAC guy recommends a 300 cfm unit and is not concerned with oversizing the unit as much as undersizing it (he’s used to installing 2,000 CFM heat pump systems in a house my size).
超大了HRV是否有问题？
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80至100 CFM连续将足够足以这所房子。如果需要，源点和冬季湿度控制的200 CFM峰值将是充足的。
嗨丹莫里森，
我意识到在提出问题时使气候和或位置是一种简单的事情。
至少暗示人们提供气候/地点怎么样？
In humid climates during shoulder seasons and cooling season Overventilation can indeed be a problem.
约翰
I'm building my house in Seattle, WA. (http://en.wikipedia.org/wiki/Seattle#Climate)
谢谢
坦率，
老实说，我对HRV来说不够了解你的问题。
I assume that the ventilation rate can still be adjusted lower?
从我所读到的是，我不会推荐使用比Ashrae 62.2高的流量设置
described in this article
//m.etiketa4.com/blogs/dept/musings/designing-good-ventilation-system
坦率，
We need to know two items of information you didn't provide in order to answer your question:
1. Square feet of occupiable floor area.
2.占用者的数量。
根据Ashrae 62.2中提供的公式，您的房屋需要50碳酸连续通风（假设面积3,500 s.f.和两个乘员）。如果您有高高的天花板，您的地区可能较少。
假设面积为3,500 s.f.和三名乘客，您的房子需要58厘米。
You don't need 200 cfm of ventilation. Overventilation incurs a serious energy penalty.
Martin
1.起居区是1975年平方英尺的高高的天花板。未完成的地下室是1000平方英尺。
2. 2 adults, 2 active kids and a greying dog
随着能源惩罚以及超大的HRV还有其他考虑因素吗？
谢谢
坦率，
Start with ventilation at the ASHRAE 62.2 level — 50 cfm in your case. If you notice any IAQ problems, you can increase the ventilation rate. But I'd be cautious about overventilating.
坦率，
我的意思是添加：只要通风率可调节，HRV额定有200CFM就没有真正的问题。例如，收缩仪200DX是ERV，其额定为50至200 CFM;它在50 CFM下表现良好。
You need to know the minimum as well as the maximum cfm rating of the equipment you are considering.
I think that besides the "energy penalty" there may be a durability issue associated with overventilating in a humid climate......during cooling season
overventilation makes home more humid,
homeowner feels uncomfortable , cranks thermostat down more
较冷的表面，湿度更多...不好
我意识到这可能与HRV的大小无关......而是操作。
Yeah I know, the air condtioner is reducing the humidity... but still .. not good
I agree with Martin that an ERV would work better with your humid climate and I've specified the RecoupAerator 200DX w/ great results in a moderately humid climate. If you have separate AC/dehumidifier, for more humid climate, then an HRV would work and 62.2 calculations are correct.
I'd like to resurrect this old thread because I am also struggling to size a ventilator for my house. I'm in Western NY zone 6.
I have 2400 sf house with 1600 sf finished basement (4000 sf total). 3 bedrooms, 4 occupants. And 46,800 cubic feet of airspace (which includes basement)
似乎有3种方法来计算大小。Ashrae 62.2，国际建筑规范，以及立方英尺的房子。
问题是我非常不同的数字....这是对的？
ASHRAE = 70 cfm
IBC = 150 cfm
体积= 232 cfm。
And lastly a contractor who told me 130cfm. Not sure how he calculated that.
您当地的建筑码最终将决定最低利率。在我有限的个人经验中，一旦乘员的数量开始上升，Ashrae率不足。只要它是可调的占用者正在推动最常见的污染物，CO2，所以我认为这是比占地面积更关键的数字。您计划的占用号码应包括临时占用者，例如，如果您有客人留在甚至访问超过几个小时。二氧化碳水平可以在这一点的时间内失控失控。
My main issue with my indoor air at the moment is VOCs. My house has tested off the charts, literally, for VOCs.
I don't have any building code where I am to provide any type of "follow this rule" guidance.
随着鼓风机的关注，“ECM”代表是什么？
The only downside to oversizing is cost, as long as it can be adjusted to what you need. If your house is pretty airtight and you don't currently have active ventilation, it actually might not take as much airflow as you might expect to bring the VOCs down. Still, I would lean toward a bigger unit. You can turn it down if you need to.
ECM = electronically commutated motor. These are more efficient and quieter in general, but especially when running at lower than full speed. An ECM is infinitely adjustable, so usually you can program the motor in increments of 1%.
我是第二个特雷弗。尽可能大。由于更高的HX表面积，低流量效率改善。但只有ECM粉丝，所以你不支付它的风扇能量。我的个人顶级选择是Vanee Gold系列（HRV或ERV），而Renewaire EV Premium L.这两者都与ECM粉丝电动平衡器，以至于它们可以超过200CFM的事实并不意味着您在60CFM中支付更多费用。
Some units like the Vanee AI Series/Panasonic Intellibalance self adjust to the targeted airflow, so you can play with the settings without having to get out a manometer. You could set it high in the shoulder season to flush your home, and turn it down summer and winter for energy efficiency.
I'm getting really frustrated. For the life of me I have no idea how these units are controlled. The only one that seems to have controls is the panasonic intellibalence, with dials right on it to pick your fan speed and adjusting how often it runs.
How do you control the other ones? Other than just min airspeed or max airspeed?? Like if the unit says 40-250 cfm. How do you set it at 90 cfm? Or 130 cfm? Or 180 cfm?
Typically there's a wall controller with some kid of programmable controller. We'd need to know exact models in order to comment any more specifically.
The life breath 170ercd
只要我可以调整CFM即可到达我的房子的良好环境，任何事情就会没问题。我喜欢松下Intellibalence，因为它有简单的拨号，可以选择CFM和自我平衡。但是，它可能太小了。生命呼吸170ervd具有一个控制单元，即我认为*使其可调节。
I've been reading install manuals for life breath, broan, honeywell, renewaire, vahee. Very few say anything about what their cfm range is, or how adjustable it might be.
The ones John recommended above aren't in production yet from what I can see.
________
这是一个智慧智慧，正是我需要的，功能明智。
https://www.supplyhouse.com/Panasonic-FV-10VEC2-Intelli-Balance-100-Energy-Recovery-Ventilator-Cold-Climate
我不知道它是否足够大。我回过头看了我的笔记，我有两家公司给我“引用”，一个建议130 CFM单位和另一个218 CFM单位
So I've had 5 different sizing suggestions...... 70, 130, 150, 218 and 232 cfm.
承包商哈迪。打击门测试结果也可以随意使用。
有人可以告诉我40-100 CFM Panasonic是否足够大？
The panasonic will work ok at the ASHRAE levels, but won't have a lot of flow headroom or as much effectiveness during boost (the newer Panasonic's support boost now). I would lean towards something that can boost a little higher but keep your baseline flow rate close to ASHRAE's calculated value.
These offer decent efficiency and ECM fans will direct CFM setting.
https://www.vanee.ca/AI-series.html(VanEE, Venmar, Broan all have the same units will slightly different names).
Personally I'm going to be installing a Renewaire EV Premium M(or L), it has good efficiency flow headroom and ECM fans, but it doesn't auto balance.