热水气候的ERV通风系统
My old 3500 sf house is slowly getting renovated and retrofitted with spray foam to make it air tight. I need a complete new AC system and the hvac contractor talked me into a ductless mini split system since I have limited space for ductwork (the remodel will take away all attic and crawl spaces and turn them into usable living space). I’m on board with that.
另外,我最初的强度rested in installing an ERV for ventilation. The contractor says that’s a bad idea since I’m in Houston (very hot and humid). He thinks a 95 pint dehumidifier with mechanical damper and fresh air intake is a better option.
Does that sound correct? Will that give me enough air exchange to keep the house from depressurizing? Would other ways of ventilation, like bathroom exhaust fans for instance, still be necessary with that set up?
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由气候和房屋部分组织的一千个建筑细节的集合
答复
而且，ERV并没有像活跃的除湿机那样给您的空气充分化，但是它给您带来了什么，它可以免费提供。因此，我认为在潮湿的气候中比在更温和的气候中更重要。您可能还需要一个除湿机，但是它不需要运行太多，尤其是考虑到您可以在除湿模式下运行Minisplits。
如果您尚未这样做，请考虑指定HFO吹出的泡沫，而不是HFC吹出的泡沫，以避免HFC气体的重大气候影响（> 1000x CO2的效果）。
那么，一个拥有额外独立的除湿机的ERV将是一个更好的选择？他认为，具有新鲜进气口和正确尺寸的浴室排气风扇的除湿机将给我带来相同的好处，而安装成本的一小部分。
This is a guess and deserves a proper analysis, but to give you an idea: an ERV might drop the cost of running the dehumidifier by $150/year.
IMO, you should also have bathroom exhaust fans.
通过使用ERV的节省不仅在除湿中，还可以在加热和冷却中节省。
你是说开放式细胞泡沫吗？如果是这样，管理室内湿度在您的气候下变得更加重要。阅读本文以获取有关原因的更多信息：//m.etiketa4.com/article/open-cell-spray-foam-and-damp-roof-sheathing.
是打开单元。我的屋顶外面有3英寸的Polyiso板。我认为在屋顶的内部有另一个蒸气屏障，如果有泄漏，会很糟糕吗？
With that much rigid foam on the exterior, I would consider high-density fiberglass batt. You have about R-17 (maybe even R-24) now and could probably get another R-20 on the cheap. I'm assuming 2x6 rafters, but yours might be deeper. Just a thought...
See here for more info://m.etiketa4.com/article/combining-exterior-rigid-foam-with-fluffy-gusnation.
On the ERV vs. dehumidifier costs, dedicated ventilating dehumidifiers aren't cheap. And something like the Panasonic Intelli-Balance ERV isn't super expensive. The systems are probably pretty close cost-wise. Your HVAC person may be thinking of the Zender system, which can get pricey.
First I am skeptical that a renovated home can be made tight enough to truly need a ventilation system. I say forget a ventilator unless you have a blower door test under 0.6 ACH50 seems very unlikely.
如果您住在一个狭窄的房屋中，每位居民不到500平方英尺，我将加入呼吸机。在拥挤的房屋中内部和外部之间的差异为90°，他们需要通过带干空气来消除水分。您没有干燥的空气可带来。
The way I see it your climate has a very different set of challenges than a northern house and the solutions they need are not your going to work for you. If you home gets a little stuffy crack a window the temp is not all that different.
请花点时间观看Matt Risinger的YouTube视频，他的房屋处于您的气候状态，他似乎赞成中央的除湿功能，因为在大部分时间里，如果只有合理的湿度，您需要很少的加热或冷却。
Walta
I disagree. Standard thinking is that anything under 3-5 ACH 50 deserves an ERV/HRV. That is easy to get to even in a renovation. CO2 will quickly go to undesirable levels without one. I have personal experience with that after I renovated my house and got to a 2.25 ACH 50. Before an ERV was installed CO2 rose to undesirable levels.
Eric brings up a good point, Quantumgirl. Have you had a blower door test done? How tight is the house current, and have you been tracking your indoor humidity levels? So far, I think we have been offering advice without really know if there is a problem.
由于整个房子尚未绝缘的简单原因，还没有进行鼓风机门测试。我有屋顶和2个主要房间/添加开支。我有点乘房间进行翻新。有3个孩子并做大多数DIY的事情，一次不可行，一次撕开整个房子。
The only reason I even want to tackle the whole hvac issue now is because my current unit is fixing to give out. Would I be better off installing the new mini split AC system (based on calculations of how tight I think the house will be one day), then tackling the ventilation/ dehumidification issue after everything is build and insulated and I’ve had a blower door test to see where I actually stand?
您可以聘请工程师执行Aggression Manual J. GBA通常建议的。阅读本文以获取更多信息：//m.etiketa4.com/article/who-can-perform-my-load-calculations