g*****9
发帖数: 4125 | 1 Since granite is porus, stains and bacterial contamination are the two major
concern.
Plus if you spill acidic stuff on top of it and not wiped it off soon, it
will dull the surface (you can polish it back) |
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g*****9
发帖数: 4125 | 2
It is ok, but could be very slippery when wet or oil is on it.
好像便宜的$2的大理石
I you can not afford $5 per sq ft, I am not sure what to advise you.
True and false, marble is softer and porus, but it is just as easy to take
of, marble will look nice in 100 years and still be in style. I have not
seen porcelain tiles that old to comment. But I know once the top glaze is
worn, they will become ugly and much harder to keep clean.
This is good question, marble or procelain will be same temperature as yo |
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b******d
发帖数: 9694 | 3 You are right, not very likely Lions will make it to SB this season.But
there were many teams who won Superbowl in this fashion, like Tom Brady in
his first playoff year. However I won't compare them to Patriots dynasty yet
. That is why I will only put tiny money on this. If they could just make it
to the playoff, I will be quite happy.
And I believe Chiefs have better chance to make it to SB, as I compare
Chiefs to many other AFC teams: Patriots，have to say they are the biggest
threat, somehow... 阅读全帖 |
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d*a
发帖数: 1863 | 4 HVAC里
比如说加一个low efficiency filter让气流更均匀一些
这样pressure drop必定增加，因此增加的能耗能不能用 delta P直接计算呢
还需要考虑什么参数？ |
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N***r
发帖数: 2539 | 5 You can check it from any fundamental thermal dynamics book. In your HVAC
case, assuming steady state, incompressible flow, no heat add/removal, no
shaft work in this porous media, the negative work done by the porous media
to your working fluid is,
delta_P * V
in which, delta_P is the pressure loss through the porous media [Pa], and V
is the volumetric flow rate [m^3/s], note 'delta_P * V' is actually power [W
].
You may double check it with a book to confirm that. |
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