High efficiency furnaces
knsawqbe9s|发布一般的问题on
除了正确的程序er argument I can give my sister in Missoula, MT to spend twice as much to go from an 85% efficient furnace to 95%? Unfortunately she should have replaced the furnace over the summer when it was probably cheaper.
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It is easy: With an 85% efficient furnace, with every $1 she spends on heat she is getting $0.85 in heat and throwing $0.15 out the chimney. With a 95% furnace she will be getting $0.95 worth of heat with only $0.05 going up the chimney. Any good HVAC guy will demonstrate her payback.
Not so Easy
Money might be better spent on Envelope improvements
Er .. Excuse me Dr Joe
外壳改进
巴巴，
这取决于。
如果她现在每年花费900美元的高效炉子上的热量，那么效率95％的炉子将意味着她花费804美元的热量 - 每年节省96美元。
How much do these two furnaces cost? If the cheap furnace is $5,000, and the expensive furnace is $10,000, then it will take her 52 years to justify the investment, assuming that energy prices don't change.
你的旅费可能会改变。您燃烧的燃料越多，燃料越昂贵，回报越快。
正如约翰指出的那样，在阁楼上进行空气密封并加深纤维素可能更有意义。
没有说我们在谈论什么样的加热。它是热空气系统还是底板加热？还有什么燃料？现有锅炉的年龄是多少？我刚刚修改了一个水力加热系统，并安装了Weil - 麦克兰Ultra Series 3高效锅炉。为了提高效率，锅炉必须以冷凝模式运行，以从废气中的水蒸气中回收潜热。这需要锅炉热量和散热器散热能力之间的良好匹配才能在相对较低的水温下运行。幸运的是，现代锅炉可以调节大约20-100％的热量输出，从而使分区更加灵活。我建议这不仅仅是用另一个代替旧锅炉的问题。从工程的角度开始评估整个系统，从建筑物的热量损失计算开始，为热量总负载以及单个区域的容量选择正确的尺寸锅炉。 In conclusion: A “leaky” building should be fixed as a first step and then the heating system should be upgraded after a thorough evaluation. Even if the payback may not be very attractive today, the energy prices will go up for sure in the future. The questions is only how soon and how much.
Assuming the OP understands the meaning of "furnace", then we know it's a hot air system.
To Robert Riversong
感谢您的讽刺言论。我认为这是一个提供帮助的论坛。
效率为95％的速度循环风扇的炉子将减少燃料的使用，并以多种方式更加舒适。一方面...他们大部分时间都非常慢……这使他们非常安静。可变速度的成本更高，但价值不仅仅是我的花岗岩台面。
I would suggest she get supplier prices for each furnace and let the installer know she is willing to pay that difference only. They should bite in this economy.
我认为如果今年完成工作，我也有很好的纳税折扣吗？
There was nothing sarcastic about it. It is a straightforward statement of fact.
但是回答一个没有问的问题没有任何帮助。
Robert: "Assuming the OP understands the meaning of "furnace", then we know it's a hot air system."
FWIW, I don't think we know any such thing. "Furnace: an appliance fired by gas, oil, or wood in which air or water is heated to be circulated throughout a building in a heating system." Industry-specific usage aside, I believe this is a generally understood definition.
我不同意，炉子和锅炉之间的区别是我们正在讨论的“行业”：住宅住房。
US DOE:
"Most U.S. homes are heated with either furnaces or boilers. Furnaces heat air and distribute the
用管道加热空气穿过房屋；锅炉加热水，提供热水或用于加热的蒸汽。”
Bubba，您需要获取适用于房屋的特定数字，并确定还需要多长时间来偿还更昂贵的单位的额外费用。然后，您需要考虑（如果有的话）回扣/激励/税收抵免方案适用于工作，联邦和州政府，当地公用事业公司等。那么，您需要添加到任何制造商折扣可用的。可以进行一些研究才能降低更换设备的实际成本。
您可能需要让能源审核员检查房屋。他们应该熟悉上述细节，可以为您测试漏气和导管泄漏等。我敢打赌，MT中有很多好人可用，大多数房屋都有可以相当便宜改进的区域。
Robert, the DOE's industry-standard definition is not the issue: my point was that we can make no assumption that this particular question is posted by someone who is aware of it, as there is also a general usage with a broader definition. That said I imagine that there is a very good chance that this is a warmed air system if only because these are more common than not, especially where a/c is also used. But how these guesses contribute to answering Bubba's question I have no idea.
BTW I have always thought 'boiler' was a misnomer for those systems which employ hot water rather than steam.
Of course, the term came into common parlance when heaters and engines ran on steam. After we turned down the aquastats to less than 212°, we kept the common name. Now, rather than using the heat of vaporization in the radiators, we capture it in at the heat exchanger in condensing boilers.
The lower temperature radiators might have been the result of "boilerplate" legal warnings about the danger of burns. ;-)
哈！
我与HVAC承包商进行了ROI讨论。以马丁的榜样，还需要52年的时间才能偿还。就我的情况而言，我每年只使用100美元进行太空供暖，并且使用高效率炉并不经济。
但是，我的HVAC承包商表示2级高效率炉可以具有以下其他好处：
1.更舒适和安静。它可以使用恒定的低速鼓风机来维持所需的温度，而不是频繁的开关循环，而不是高速鼓风机，这也使系统更加磨损。
2. During the allergy season, he uses the low speed blower and high efficient filter to get rid of the pollens and dusts. He is basically using the furnace as a whole house air filtering device without heat.
I don't know if his points are true or not - just want to share what I heard.
您每年只使用100美元的空间供暖？这是3000英尺的房子，有一个5个月的暖气季节？请提供更多详细信息。