Exhaust-Only vs. ERV System Ventilation in Bathroom
I am looking at adding bathroom ventilation to a house that was built in the 1970s.
The house has a pretty standard envelope for a house of that time with fiberglass batts in the walls and blown-in insulation in an unconditioned attic.
My question is given what I assume is a fairly leaky envelope, does it make sense to go with an ERV style of ventilation system or just use something like Fantech’sPBW 110浴缸W /格栅 - 浴室风扇 - Fantech?
The house is 2300sqft w/ 2.5 bathrooms
浴1 - 850立方英尺
浴2 - 560立方英尺
Bath 3 (half bath) – 185 cubic ft
显然，我们正在谈论两点不同的价格。我很难确定ERV系统是否是给予信封的价值投资，但是110cf的排气似乎是一个公平的数量，可以通过房子里的随机泄漏。
Any thoughts?
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As I understand it, an ERV system is only needed in a tightly insulated house, so that you can supply fresh outside air, and exhaust stale inside air, all while minimizing the effect of introducing cold/hot/humid/dry outside into your house.
1970年代的房子不需要任何额外的通风，因为它应该通过空气泄漏到它的建筑信封周围。如果您正在重塑，以及喷涂起泡或以其他方式紧密绝缘，才能使用ERV的唯一一次。
除非上述是真的，否则只是放入正常的浴室粉丝，因为他们没有整天运行，只有30分钟一次到一个小时。绝对为他们的计时器提供所有，因此他们没有跑步。这就是我们为1960年的ERA砖房所做的。在我们跑浴室风扇时没有注意到房子里的任何问题，无论是冷还是温暖的外面。我确实把计时器打开了，因为如果你不这样做，你的孩子或配偶或客人都会整天留下风扇。
I would say it depends. Disclaimer: I'm not an HVAC engineer, just some asshole on the internet.
没有HRV / ERV不仅适用于紧的房屋。考虑到“通风”虽然假定的泄漏组件的墙壁将通过灰尘，模具，垃圾等，并且可以是气流限制的（即：不推出其全容量）
vs.
A mechanical ventilation system that brings in as much air as its sucking out, being net neutral in pressure. Consider even making it slightly positive to bring in better controlled ventilation air and it'll push out the leaks in the walls. Also, now you're bringing in filtered air (although the standard filters in many ERV's aren't much, but you can upgrade them or put in a filter box) which I consider a much better system for indoor air quality.
If its only for the bathrooms, consider an HRV so you can better exhaust high moisture air, as opposed to keeping most of that moisture with an ERV. This highly depends on where you are in the world and what the exterior air moisture content is throughout the year. Moisture is a big issue, track it and make sure its good.
此外，绩效价格差异很大，大多数人只会从家庭仓库中占用300美元的浴室粉丝，并每天称之为。如果您想要更好的室内空气质量，并且HRV将成本更高。如果是值得的话，这取决于你。
杰米
I am just north of Dallas, so climate zone 3A W/H.
I was looking at the Aldes IAQ system for 2.5 bath and you pretty quickly hit the $1100 mark, so some rational starts to be required when you jump from the $60 Home Depot fans to that price bracket.
我不是在尝试光顾或一个**洞......但是HRV / EVR存在的原因是解决今天建造的极其紧的房屋内的糟糕空气问题。由于问题完全不同，我毫不犹豫地应用绝对必要的解决方案，这是一个泄漏的房子。
泄漏的房屋足够或超过足够的通风。将HRV / ERV放入等式只是对我有意义，除非您也要紧张。
如果你去了积极的压力路线，那么如果你的房子位于北方国家，那么在冬天，温暖的潮湿空气将渗入你的墙壁腔内。如果发生这种情况，您可能会看到木材腐烂和模具。在夏季，您将把凉爽的空气推入墙壁上，并减少效率。HVAC安装人员应该支持其炉/交流安装，以没有积极或负压。
I think the best you can hope to accomplish with a HRV in a leaky house (which you don't make tight) is to not draw more air than is already coming in, and keep your balance neutral. And allow the leaky air to continue coming in as before. It's not an unreasonable goal, but the cost seems high for the benefits. And you would need to have the HRV in on-demand mode, only turning on when the bathroom vents (or kitchen vent) is on, and then shutting off.
Personally, I would not bother with an HRV/ERV, but instead would go the bathroom vent route, and properly vent it outside, it will work perfectly fine. If the 1970's house and occupants survived just fine until now with leaky walls, I don't think an occasional fan will cause any issue when it draws a bit more air through for temporary periods of time. That's how they were designed to work. And in reality, the air coming in IS cleaner than what's in your house, especially in the bathroom or when cooking.
There is also the matter of climate. Are you in a cold climate? I ask because, as Martin points out in本文，ERV或HRV系统的高成本可以在非常寒冷的气候下合理，但在更平缓的气候中，在更简单的通风设备产生的能量惩罚低于寒冷的气候，它可能最好安装更便宜仅排气（在您的情况下）通风设备。