水力与迷你平地加热
Hi all! I’m currently planning an hvac retrofit and was hopping you could let me know if I’m on the right track and/or offer suggestions and improvements I may not have thought about.
The home was built in 1977, brick with mansard style roof. Electric baseboard heat in every room, no air-conditioning, only 1 of 2 bathrooms is vented. No ducting and no good place to run it now. Climate: Ottawa Canada, I think that’s 6A? Hot and humid summers, cold winters [-13F , +86F].
Design loads: 40,500 BTUh heat, 16,500 BTUh cooling. A little leaky: ~5 ACH50. Insulating the external walls would be cost-prohibitive. Heating is my primary concern, any cooling and dehumidification would be bonus.
我已经100％的电动空间加热了，所以我想改用热泵。迷你切片是显而易见的选择，但房屋不是开放概念。除非我在每个房间里安装一个头，否则我不相信他们可以提供舒适的供暖。为此需要10个头。如果我提供一个平面图，是否有人愿意尝试说服我的迷你拼图会起作用？
为了分配，加热地板很有意义。我的地下室有开放的天花板，因此我可以轻松地在托梁之间的板上添加PEX。这促使我为第二层室的空气到水热泵和低温散热器。我正在寻找SpacePak和北欧系统。
为了在夏天不要浪费ATWHP，我正在寻找一个可以放入壁橱里的小型风扇型单元 - 只是为了使房屋中心冷却和除湿，而不必担心将其放到每个房间。奖励是冬季粉丝圈的额外热量，这意味着我可能会在上层房间中散发出稍小的散热器。
So, is it a good idea to go for hydronic system with heat-pump? or can mini-splits work in a leaky home with many rooms, but without super-insulated walls?
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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
Have you considered room size fan coils?
而不是加热地板？它绝对是一个选择。我看着Jaga Briza 12.我有点担心每个需要自己的冷凝水排水口 - 这可能是很多孔穿过我的外墙，并且很难运行绝缘线（它们可以通过2x4吗？托梁？）。
因此，我在想一个或两个易于到达风扇线圈，外墙上有散热器以更容易安装？
尝试通过此计算热量损失：//m.etiketa4.com/article/replacing-a-furnace-or-boileras a second method if you haven't already.
If you're considering running pex under the floor, why can't you run ductwork there? That'd cover at least the first floor.
如果你去multi-split路线,你会跑into problems with oversizing: there's no system that can handle ten heads with only a 40kBtu heat loss (nor any smaller multisplits that can handle an average heat loss of 4kbtu/head). A workaround might be: cover the highest heat loss spaces with appropriately sized system(s), potentially ducting clusters of rooms if you can (an example would be adjacent bedrooms), and leaving the baseboard for the smallest heat loss spaces.
带有ATW热泵的加热地板会很昂贵 - 在此之前，我会考虑在此之前添加全室管道，因为在这种情况下您会获得两个系统。
|If you're considering running pex under the floor, why can't you run ductwork there?
because pex can go through the joists. There's not a lot of head room, and the basement is split up into 3 areas separated by load-bearing cinder block walls.
That's a good reason! Ducts will make life easier, I'd try hard to incorporate them wherever you can, leaving the baseboard for the hardest locations. I think you'll find baseboard will be 3x as expensive to operate but if you're spending $5k/head or so, it remains an easy choice for many rooms.
The only place for ducts is in the unconditioned attic... I'm no expert, but I can't see any good place to run them.
Cost wise, I look at the savings potential and compare that to an investment in a dividend stock yielding 4%. Cutting my space heating in half, aiming for 4% tax free cash return per year... I can budget up to ~$30K. More if seasonal COP is better than 2.0
|尝试通过此计算热量损失：[...]
This was great! I think I did this a long time ago. I ended up with 30K BTU. That's right around my 'done-by-hand' conduction loss through all external walls.
我最终获得的40k BTU是从Hot2000软件中建模我的房屋：https://www.nrcan.gc.ca/energy-effipication/homes/professional-opportunities/tools-industry-professionals/20596
该10K差异是由软件估计的空调100％考虑的！很难相信我没有5 ACH50的空气裂口损失...我想这是一个没有炉子吹气的优势。
哈！泄漏是在线计算器的致命弱点，这就是为什么他们难以与现实相匹配的原因。
供暖约为7900 HDD65F和约22,000 kWh？我认为，如果您优化设备，它可以解决 - ATW似乎比多裂（S）更好，因为它适合负载要好得多。让我们知道您收到的报价！这些费用似乎很接近？
Current Heating Cost $4,415
COP 2
Annual Savings $2,207
Rate 4%
20年
现值$ 30,000
我们中的一个数学错误 - 您的成本和节省是我拥有的两倍。
demeedays.net使我大约为8130 HDD65F。
在过去的12个月中，总用途：21,790 kWh。通过平均夏季使用（无A/C），估计的基本负载 + DHW为370 kWh/月。
So 17,350 KWh for space heating x average cost $0.13/Kwh = $2,256 annual space heating via electric resistance. So savings of about $1,130 per year if I get COP 2. Divide by 4% = $28,250. I rounded up to 30K.
鉴于电力公司最近根据使用情况转换为分层定价，因此节省应该更好。
>让我们知道您收到的行情！
Will do! I just need to find someplace that's willing to do it...
Gotcha: it's dependent on the life expectancy of the heat pump - I used 20 years, but in perpetuity, you're right. That's a point in favor of ATW, most of that hydronic equipment lasts a long time even if the HP itself is more mortal.
That kwh and HDD puts your heat load even lower! 24kBtu or so: 80 HDD x 303btu/hdd/hr.
If you haven't read this, it's great://m.etiketa4.com/article/air-to-water-heat-pump-retrofit