Replies

1. 
   Mike AbiEzzi|2019年7月21日下午10:21|#1

   I think I answered my own question

   “The myth that HRVs are preferred in northern areas is based on a freezing problem that ERVs experienced twenty years ago. This problem has long since been corrected, with current models featuring updated technology. However, some still use this outdated claim as a misleading justification. The HRV industry survives on this misinformation.”

   https://www.ultimateair.com/blog/bid/85515/energy-recovery-ventilation-or-heat-recovery-ventilation

2. GBA Editor
   马丁·霍拉迪（Martin Holladay）|2019年7月22日07:52 AM|#2

   麦克风，
   For more information, see this article:“防止HRV和ERV中的霜冻堆积。”

3. 
   Trevor Lambert|2019年7月22日08:35 AM|#3

   An ERV passes some of the moisture from the the more humid stream to the less humid stream. So in winter, some of the moisture in the outgoing air will be returned back to the house. This is contrast to an HRV, where the moisture in the house goes directly outside and is replaced by whatever is in the incoming air.

   我发现Ultimateair的评论令人困惑。人力资源管理行业和ERV行业本质上是同一行业。几乎所有制造商都生产两种类型。Ultimateair是仅产生ERV的罕见例外。ERV和HRV核心都可以在寒冷的天气下可能冻结，并且两种类型都包括各种霜冻预防策略。

4. 
   乔恩·R|Jul 22, 2019 08:57am|#4

   > Do ERVs help retain moisture

   Quite possibly too much, leading to Winter moisture problems.

   如果您可以准确估计水分负荷和室外状况，那么您可以从湿度的角度来计算哪个更好。在寒冷的气候中，人力资源管理可能会更好。

   If it's close, I'd use an HRV. There aren't good alternatives for reducing Winter indoor humidity below ~45%.

1. 
   Mike AbiEzzi|2019年7月22日上午10:21|#5

   Do ERVs allow you to set the desired humidity level? In winter, 40% would be ideal compared to 20%.

1. 
   Trevor Lambert|2019年7月22日上午10:41|#6

   They do not. The Q600 is a new model, but if it's like previous Zehnder units you can swap out the core, changing it from an ERV to an HRV and vice versa.

2. 
   Charlie Sullivan|Jul 22, 2019 12:43pm|#7

   With either ERV or HRV, you can control the amount of run time or the speed to have an influence on humidity. I've heard of systems that are cycled on and off by a humidistat, but it's more efficient to run it continuously at low speed.

   The problem might be that with an HRV in the dead of winter, the run time might be too low to get enough ventilation, if you target a fairly high humidity. On the flip side, in shoulder seasons in some climates, it can be hard to get enough moisture removal using an ERV, when the outdoor dew point isn't all that low. You end up running the ERV on high all the time and not getting the humidity down as you'd want to, while wasting energy and making it noisy.

   在您的气候下，后一个问题可能永远不会发生，因此您可能想要ERV。这确实取决于您产生的水分：人数，烹饪风格，淋浴设置和用法等。因此，很难预测。

   A nice thing about Zehnder is the swappable core, which means you can change it out if you guessed wrong about which will work best for you. We own both cores, and use the HRV in the fall and early winter, when the house has a little more moisture in it than we want coming out of summer, and then switch to ERV for the late winter when it's getting a little dryer than we'd like. Summer is definitely ERV to keep the spikes in outdoor humidity from coming inside, so I usually leave the ERV in through spring.

1. 
   乔恩·R|2019年7月22日下午12:57|#8

   查理有一个很好的方法。现在，如果它可以自动化，以便可以更频繁地切换。以创造合理的回报的价格。