加热和冷却负荷计算
嗨
因此，我家的计划是完整的，现在我需要在安大略省南部（多伦多地区）的任何好公司都知道任何良好公司的装载计算。
Would like to use Mini splits, the house is going to be tight and well insulated. So hopefully I can find someone that can understand my needs and not just try to sell over-sized unit.
With determining R-value of a wall that will have 6″ of Polyiso on the outside of a 2×4 stud wall filled with R14 Roxul, what rating would I use on the Polyiso knowing the outer will de-rate some.?
And will it matter much in the load calculations?
As the Polyiso seems to given a rating between R5-R6 per inch/ depending on temp and age.
谢谢Again…. In helping me get my dream green home built.
Dave
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Replies
When most of the R-value is polyiso, assume R5.5/inch at your 99% outside design condition, higher than that on average. The outer inch will perform less than R5.5, but the middle inches will outperform higher.
A 2x4/R14 wall with gyprock interior and typical siding options will run about R10, so with 6" of polyiso (R33-ish) you're looking at about R43 or U0.023, give or take. If you worst-cased it and assumed R5/inch it would be about U0.020, but that's unrealistically conservative.
除非您承担大量漏气或高通风率，否则您的窗户损失可能会主导热量负荷数。
谢谢达娜，我希望你能说明，因为我觉得你是谈到这一点的专家之一！
Of course you could be a crazy guy in the basement making S*** up... but I'll take it either way.
谢谢
现在要尝试在这里找到专家，进行计算。
I like math and problems but I assume these calculations. are over the average guys head.?
Dave,
The person who performs your load calculations doesn't necessarily need to live close to your home. For more information on this topic, see谁可以执行我的负载计算？
I guess that is true, they just need design/drawings and details. Thanks Martin.
好吧，现在我只是在寻找可以做好计算的人。
Any idea on what the going rates are? I assume the US is always cheaper than up here.
谢谢，
Dave,
Once again, I urge you to read the article that I linked to. The article discusses rates.
Will do, Thanks
“当然，你可以成为地下室的一个疯狂的家伙，因为我会带来的......但我会以任何一种方式服用它。”
I usually just make it up as I go along. So? :-)
At +20C indoors, -17C outdoors (the 99% outside design temp for Torontohttps://articles.extension.org/sites/default/files/7.%20Outdoor_Design_Conditions_508.pdf), with R14 in the cavities and R30+ on the exterior, the warm side of the polyiso will be at about +5C, and the mean temp through the foam no colder than -6C, which is a tiny bit below the cold end of the curves in this graph:
//m.etiketa4.com/sites/default/files/Polyiso%20penalty%20-%20BSC%201.jpg
So perhaps R5/inch would be a more realistic estimate to be using for a heat load calculation (not that it'll move the whole-house loss numbers much), even though at the average winter outdoor temperatures in Toronto performance would be more like R5.5/inch.
即使是1月份，多伦多的平均户外温度也为约-5C，这将在泡沫的热侧移动到约+ 10℃的温度，并且通过泡沫的平均温度为约+ 3C / + 37F。
https://weatherspark.com/m/19863/1/Average-Weather-in-January-in-Toronto-Canada#Sections-Temperature
因此，大多数多种多变样品测试的大多数样本将平均接近您的堆栈中的R5.5 /英寸，并且在冬季的位置，在肩部季节期间更高。但只有99％的设计温度的R5-ISH。