答复

1. 
   Paul Wiedefeld|11月14日，2021 08:05 PM|#1

   Hi Shaun,

   你打算用它作为车库吗？多常？

   如果它被用作车库，我认为辐射的地板可能有一个地方。然而，一个尺寸和厚度需要很多时间的地板待热，所以希望您能够从空间中获得大量使用。我知道丙烷昂贵，但你的电力运行了多少钱？您可以在强制空气中获得更多响应性，如果您的电力是全国平均水平的，那么更经济的系统。在新的构建中可以轻松规划太阳能，您将能够与这些尺寸符合巨大的阵列。

1. 
   肖恩A.|Nov 14, 2021 08:31pm|#2

   Thanks for the reply! It will be used quite a bit. Would like to keep the min temp at around 55 most likely. My woodworking shop will be in it on one side and then I will have a lift and other car stuff on the other side! Our electric is $0.0504 per kWh and our LP is $2.79/gal.

1. 
   Paul Wiedefeld|11月14日，2021 08:46 PM|#3

   很高兴看到！有一块电动账单方便吗？公用事业以如此不同和复杂的方式分解其成本，我怀疑您的电价可能更高（但希望没有）。它是商业汇率时间表吗？

   价格为2.79美元/加仑（当然是通货膨胀警告），如果您的锅炉效率为98％，您将以每百万美元31美元。

   At $.054/kwh, a heat pump would run you about $5.25/MMBtu with a COP of 3 (easily exceeded if you’re keeping lower indoor temps). Even if your total electric rate is $.15/kWh, still half propane.

   I think some attention should be paid to the ductless splits - their filters aren’t designed for dusty environments. A ducted system could fit some large and deep air filters to keep the equipment clean.

1. 
   肖恩A.|Nov 14, 2021 09:23pm|#4

   I have an older bill That is where I got that $.050. Something else I should look for? I could do a ducted unit with exposed ductwork. Should I have a professional Man J done so I can pick the correct equipment? Thanks for the help

1. 
   Paul Wiedefeld|11月14日，2021 09:57 PM|#5

   If that rate includes generation, transmission and distribution, that should be pretty comprehensive. Basically, every cost that’s per kWh should be summed. The manual J is a good plan, the garage doors are a wildcard.

2. 
   W Ramsay.|11月15日，2021年08:44 AM|#6

   I faced a similar issue. Mine is garage+foyer+bathroom on ground level and woodshop/photo studio + office on the second level. DC is in a closet on the 1st level. This is Minnesnowta.

   Heat Part I: In-floor radiant was only realistic heat choice as running any kind of forced air when dust is being made just doesn't work unless you like to stop every 10 minutes to clean/change filters. I have 4 zones; Garage (which is fully insulated separate from the rest of the zones), Foyer+bathroom+DC (t-stat is in bathroom and this zone is mostly to keep the bathroom warm, the foyer is just along for the ride), Office (which is fully insulated separate from everything else) and shop/studio space. The plan is to keep the garage @ 42°f unless working in there and the shop/studio @ 50°f unless working in there. The bathroom (+ foyer) will be kept @ 60° and turned up when others are there for a photo shoot. It also has a Toto heated seat. Office likely 68-70°f.

   COOL A PART I：我在办公室上方的夹层中安装了一个大型变速风扇（7400 CFM IIRC）。在很多天时，我应该能够打开一些窗户，以低速打开这扇粉丝，并有足够的冷却（以及一些空中木粉尘的排气）。当我从木工切换到照片拍摄时，通过清洁，尽可能高兴地将风扇转换为高，然后用叶子鼓风机穿过空间来获得最终微小的比特。

   Heat/Cool Part II: 3 head heat-pump ductless mini-split. Two ductless heads in gables of shop/studio space and a ceiling cassette in the office. These work quite well for cooling the spaces in summer and even get enough cool air sinking down to the bathroom. They are not a primary heat source but can help to warm things up faster than waiting on the slabs to warm up. I hope to avoid running these very much when making dust.

   循环：我还有一个用于空气循环的管道+ 650 CFM鼓风机。一端在东端的山墙中，另一端在西端门厅的地板上。

   Ventilation: The DC closet can vary the amount of return air to the shop vs outside so in some cases I'll crack a window and let the DC and/or big exhaust fan do some exhaust side ventilation. I do not have an ERV or HRV ($$$'s). I'll monitor CO2 levels to see how things go and if necessary install one but I'm already over budget on this project. My hope is that there's enough space that with windows/doors opening/closing and maybe running the circ fan a bit that I'll get enough ventilation.

1. 
   肖恩A.|Nov 15, 2021 02:18pm|#7

   Awesome!! Thanks for the info!