超级绝缘热水器 - 数学验证
我拥有电动40加仑双元素热水器。根据制造商收到的信息，这里是规格：
47.25英寸高度
20 inches diameter
24.98平方英尺的总表面积
2 inches of foam valued at R-16
My water temp is set for 120, ambient temps in the basement are 54F, though the floor can be cooler than this (48-52F). I used the conductive heat loss equations shown here (http://leaningpinesoftware.com/hwpipes/hot_water_heater_tank_insul.shtml.) to calculate a loss of 264 kwh/year in standby losses (~$29/year at local electric rates).
The heater blankets (2 foil faces with a thin layer of fiberglass) typically found at the box stores retails for about $25. For $22 I purchased 49sqft of R-19 which was enough to wrap the tank and then some. I re-ran the numbers and came up with a loss of ~$13.3/year which seemed low (since I wasn’t able to cover the bottom of the tank. The adjusted math factoring in the uncovered bottom of the tank adjusts the losses to $14.7.
我的问题是：
1）数学是通过坦克看起来初始计算被动损耗的声音吗？
2）计算ROI时，我是否必须要考虑到牛皮纸的外表面？(e.g. The original tank un-modified is 20 inches in diameter, adding 6 inches of fiberglass adds an additional 12 inches to the diameter, doing so would mean the surface area goes from 24.98 sqft to 44.15 sqft which would make the modification a bust).
3）将击球板的外部与各种辐射屏障包装有任何好处（假设屏障成本为0，因为我从另一个项目中过量并且我可以保持足够的气隙）
4）如果是3，你知道我可以用来计算从这个增加的步骤计算潜在节省的任何等式吗？
Side Note:
坦克坐在价值5英寸的普通砌体砖和金属垫片上。我有手段将坦克抬起到位，而不会使水耗尽以更换5英寸的脊布泡沫的砖块。根据原始的4个问题的答案，我可以使用从我需要购买的纸张中的碎片继续向这条道路继续下去，以重做我的阁楼舱口。
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Replies
Fun with math... another way to play with your math. If you worked for pay the amount of time you have put into postulating...
If you started to wash your hands always in cold water, rinse dishes in cold. laundry in cold... the savings would eclipse your blanket wraps...
And as to your insulation... just get at it and start saving... more time spent say widdling wooden art sculptors to sell for a source of green just like insulating the tank...
克里斯托弗，我认为数学是超薄的，但也许它让你在球场。实际上，坦克中的水与顶部最热的水分层。房间里的空气也是如此。坦克顶部和侧面的管道虹吸出来。高度准确的计算将更复杂，可能涉及时间模拟。
在我看来，额外的玻璃纤维将产生一些差异，辐射屏障也是如此。闪亮的一面应该出去，所以不确定你的气隙是什么意思。设置泡沫绝缘装置是一个重大改进。
有趣的琐事：现在在华盛顿州要求泡沫保温垫。
I made a stand from PT wood that puts 7 inches of Roxul under most of the water heater. I'm surrounding the water heater with another 7 inches of roxul but I need to get around to seismic bracing before I complete that. One particular benefit is that the roxul is so thick and relatively rigid that I can carve out a niche around the TPR valve (normally an uninsulated thermal leak) to safely operate, while still insulating over it.
Heat trap loops on the pipes, and generous pipe insulation close to the heater will also help reduce standby losses. I used big pieces of roxul on the pipes near the WH as well, although I reverted to regular pipe insulation past the heat trap loops.
I can't really help with the math, although I can say I did it at one point and decided it was probably worthwhile in the long run (the roxul cost more than fiberglass, too). It's definitely getting into diminishing returns territory, but it's also a cheap and easy task you can do while saving up for bigger improvements.
Proof is in the pudding. I wrapped my three tanks (domestic 50gal and two 70s for floor heating) in use R30 fiberglass with one side foil and put 4" of EPS underneath. The tanks stay MUCH warmer all day and night now. They certainly did NOT beforehand.
AJ：I was on my lunch break at work while I posted that question so technically I was being paid to postulate =). That aside we already do all of the other things you mentioned, but theres always more to be done to maximize savings.
大卫：我害怕那个。我知道储蓄只是好奇，直到项目为自己支付了多长时间。空气差距评论是因为没有一个辐射就不会工作。
尼克：我们有一堆3/8“壁厚聚乙烯管道绝缘，所以我继续前进并绝缘所有铜，让坦克和几英尺的冷线感到温暖。我很确定坦克已经建成了反虹吸乳头，但它们仍然感到温暖;我猜他们也不完美地工作，所以它们也有一些绝缘。我留下了足够的玻璃纤维，以覆盖18英寸的玻璃纤维的坦克顶部，用18英寸的玻璃纤维切割孔锯适合管道。
保罗：我想我最终会坦克，然后用碎片擦拭砖块并用垃圾擦拭。
谢谢每个人都花时间去回应。
Chris, have you started to wash hands and laundry with cold? Have you a no water toilet? There is quite a bit you can do along with insulating your water system. Try out some habit changes that can really cut down on water and energy and time and materials and maintenance.
Doing less and you will be doing more...
AJ：
是的，是的。事实上，我们的垫圈明确地设定了“龙头冷”，而不是冷，因为寒冷实际上是用温水的温水，用于在一些机器上洗涤性能。我没有一个“没有水厕所”，但我并不真正关注任何水节食/填海工程（使用灰水恢复用于厕所使用，雨水等），因为水在北部纽约中如此便宜。