太阳能被动悬垂设计在技能/神职人员屋顶上？
Melaniebethscott| Posted inEnergy Efficiency and Durabilityon
Hi,
我和我的丈夫正处于宾夕法尼亚州华盛顿的一位建筑师（匹兹堡以南。我们正在尝试用SIPS建造一个太阳能被动房屋。我们的建筑师很棒。他很早就承认没有做过许多太阳被动房屋，这是可以预料的，匹兹堡不一定是有效家庭设计的枢纽。因此，我一直在做很多计算（我很好，让我感到有用）。
该设计是相当基本的：矩形，南部有4/12的音高，北部的窗户和6/12的音高。IVE附加了一个部分，以获得更好的方向。显然，我们可以在4/12的南部进行2'悬垂。我们正在质疑6/12的2'悬垂/扩展对clerestory的有效性。向上的音高会影响计算以及窗户的阴影方式吗？还是夏天的阳光在窗户上闪耀，无论延伸范围如何？
I had the architect place the windows up higher in an attempt to shade them in winter, but I’d prefer them lower if an overhang/extension will work. I’ve been trying to use some of the online overhang design tools, but again, they don’t factor in the possibility of an upward pitch.
PS。这种屋顶设计的技术名称是什么？？？技巧？棚？腰？单个音高？屋顶？
谢谢！
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答复
The overhang on the upward sloping roof will have about zero shading effect on the loft windows. Supplementary external shading is pretty hard to incorporate in that roof format also - about the only workable option is an exterior venetian style blind. Otherwise you'll need low SHGC glazing in those windows or you'll cook.
I'm pretty amazed that your architect couldn't advise you on this. Fundamental solar control issues have been pretty basic stuff in the curricula of most architecture schools for generations.
关于阴影的工作原理的重要性就是相对于窗口相对于窗口的边缘的位置。因此，倾斜的悬垂性可以正常工作，但是就像安装到更高的悬架一样，您需要进一步走出来。计算计算时，请使用端点的高度 - 悬垂的边缘及其水平伸展，而不是其对角线长度或窗口上方的起始高度。
就我个人而言，我喜欢那里悬垂的外观，平行于下屋顶，而不是抬起它，继续延长较高屋顶的线路。这为您提供了给定的悬垂距离的更多阴影，但是随着向上的音高获得更长的高度，更长的距离为您提供了更好的夏季/冬季差异。
At first he said we're not able to do the overhang, then when I pressed why, he mentioned that he didn't think we could get any shade from it. (so he probably knows, just trying to appease me). I was just doing my own research. This type of roof seems to be popular with solar passive design,I find it hard to believe there are no shading benefits to the upper windows.
I'm not too worried about cooking. We spend alot of time outdoors in the summer. Its the winters that tick me off.
That looks like it'd require some pretty fancy math, Charlie. So, basically, that overhang needs to be much "longer" in order to do the shading. It'd be nice to put a south slope overhang on that roof, but I'm watching the dollars and the windows are sucking them all up.
Melanie,
Do'n forget overhangs have several functions. Keeping your walls dry is always a good idea.
Melanie:
A wonderful source for solar calculations, including in this case roof overhangs:http://www.susdesign.com/overhang/
房主面临的挑战在于，我们必须从良好的老式偏见中构建科学（通常不同意），有时甚至是错误的信息。通过以某种方式，我们已经得出了为我们特别情况有效的结论。
例如,作者写道“ov之一erhang on the upward sloping roof will have about zero shading effect on the loft windows" ... and that "you'll need low SHGC glazing in those windows or you'll cook."
另一位贡献者写道：“关于阴影的工作方式重要的是悬垂的边缘相对于窗户的边缘。因此，倾斜的悬垂可以正常工作，但是就像安装在更高上方的窗口一样，您需要它才能进一步出去。”
与此类相互矛盾的信息有什么关系？我收到的最好的答案是“不再摇滚！”研究，研究，研究。像研究生课程一样接近该主题，每晚和周末都需要阅读。
Only then, in my case, after about one year's study, did I know enough to at least question the builder or architect when I saw design decisions that looked off base for what we are seeking to achieve with our passive solar cabin. It still seems like an impossible task..
I'll conclude, Melanie, by noting that the passive solar consultant that we hired for our project, which is a similar design as you have illustrated, noted that our clerestory roof overhang, based upon our site's latitude and building orientation, will provide shade during summer solstice. Moreover, we will have high SHGC in our clerestory windows, based upon the ratio of all southern windows to floor area and thermal mass for storing the sun's wonderful and free heat.
Did we make the right decision? Time will tell.
为我早些时候匆忙的回应表示歉意。我对您的建筑部分的看法还不够近距离，并且假设窗户比实际显示的要高得多。靠近屋顶坡的2'高窗非常容易阴影。在您的纬度中，中午仲夏太阳高度与水平相距约72度。从窗户底部到上屋顶线的投影斜率的痕迹，您可能会发现一个约18英寸左右的悬垂（在水平上测量）。太阳高度，您将在一天中的大部分时间里和一年中更长的时间内获得良好的阴影。请记住，一年中最热的日子在6月22日之后出现。最终，所需的阴影和所需的太阳能之间的平衡收益是根据您的个人喜好和房间的使用以及内部可用的热量来吸收过多的收益的判断电话。
Melanie,
Charlie gave the correct answer: "What matters on how the shading works is just where the edge of the overhang is relative to the window. So an overhang that slopes up can work, but just like one that is mounted higher up, you need it to go out further."
I would also like to second Randy's suggestion to use the online tools atSustainable Design.
最后，注意：如果您的设计师不熟悉被动太阳能设计，请谨慎。关于被动太阳能设计重复规则的大多数教科书在1970年代制定了，并且随后的研究发现了许多这些想法。通常，您可以通过安装超大朝南的窗户加热房屋的想法在您的气候中存在缺陷。在大多数情况下，投资良好的空气密封细节，额外的绝缘材料和高性能的窗户更有意义，而不是添加更多朝南的玻璃。
South-facing glazing can lead to overheating in some seasons, and always results in heat loss at night. It's usually best to size windows according to your need for natural light and the view, not passive solar principles.