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In the summer you could have the white side of the slat
reflect more solar energy, and in the winter you could use
the black side to absorb more.
However, the heat gained in the winter might not be worth
the reduced light reflected into the space.
Absorbing light: Dark vs bright.
https://sealevel.jp...vities/ts1enac1.pdf
Kid's experiment from NASA website. [doctorremulac3, Feb 28 2021]
US20110155331
https://patents.goo.../US20110155331A1/en
A dual purpose Venetian blind for assisting in cooling and/or heating an adjacent room by providing slats with one side having a heat absorbing surface and the opposite side having a heat reflecting surface. [xaviergisz, Mar 01 2021]
[link]
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It's good. If you search for "blinds black on one side white on the other" there are newspaper articles dating back to 1978 touting this as an energy saving idea but you need to subscribe to see them. |
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[kdf] - The sun rises and sets. The sun only comes into my
house for about 45 minutes, while the sun angle allows it
to come through the slats. I don't raise and lower the
shades every morning and night. And so a good portion of
the light gets reflected outside of the hose, because we
want privacy. |
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And so no. We don't own it once it comes inside the glass.
A good portion gets bounced back outside the glass. More
gets bounced outside the glass in the winter than we
want, because out blinds are white. The fact that people
outside the glass see white, means that the solar energy
and light is getting bounced outside the glass to them. If
we had two color slots, we could have the black facing
the sun in the winter, and the white facing the sun in the
summer. |
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[2 fries] You are right. I couldn't find any products on
Amazon or other sites with black white slats. |
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//Once the sunlight gets through the glass - any mix of wavelengths - you own it.// |
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Or anywhere else, for that matter : you should really bone up on the "greenhouse effect" : it's not the visible-range radiation that "bounces around" inside : if that comes in the window and hits something reflective it can bounce right back out, again. |
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You are right. We could test it very easily. |
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However, "if it doesn't exist now, then it is not a viable
product" argument is wrong, pointless, and boring. |
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Almost every product could have come out earlier than it
did. |
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This argument was proven wrong by every new invention. |
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re: "You’re not the first person to think of it, yet you can't
find developed products. Why not?" Many "inventors" were
able to get previously unsuccessful products to market.
The demand for high performing buildings is greatly
increasing, and will only continue in the future. Small
improvements are more important as we try to deal with
climate change, and energy efficiency. The USGBC is
spreading best practices, and many people are sharing
them. This might not offer much benefit, but it seems
very easy to implement. Black paint seems just as readily
available as white. When you open or close blinds you
have two cords, but pulling either cord does essentially
the same thing. If we have two cords to pull, why not
have them do different things? One cord could be black,
and the other could be white. |
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Suppose instead you made white window sash inserts -- one
for the upper and another for the lower sash -- and stuck
the lower one in that nether region outside the window but
inside the screen, for the summer. Perhaps half of the
sunlight gets reflected away. |
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In the winter you remove them and let the light in. |
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[whatrock] That is a good idea too, and probably isn't
mutually exclusive. In order to get green building points,
there is a whole category for innovation within the USGBC
rating system. It seems like someone should try it out and
report if it is worth it or not... |
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The USGBC says one of it's guiding principals is to
Promote revolutionary and evolutionary models that
produce robust triple bottom line prosperity (planet,
people, and profit). |
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The "revolution" and "evolution" is talking about both big
and small changes. |
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I understand that this is not a big sexy change, but
perhaps a bunch of small improvements equal one large
change. In Denver the sun is there almost all the time. It
would be nice to harvest or reflect more of it, depending
on my needs. |
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Also, I understand that not very many people use black
window blind slats. |
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//Once the sunlight gets through the glass - any mix of
wavelengths - you own it. You can use shades to keep it
dark in the room, keep the carpets and upholstery from
fading, maybe - but it’s not going to make a difference in
your heating and cooling costs.// |
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No. Interior window treatments are common energy
conservation measures and are the simplest and most cost
effective way to reduce energy consumption. I know, I
used to do building envelope heat flow calculations for
architects with my little consulting business when I was a
teenager. Hundreds of houses and
buildings in the Bay Area are very energy efficient
because of me. I don't like to use the word hero but,
well... |
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//Then riddle me this, Batman: You’re not the first
person to think of it, yet you can't find developed
products. Why not?// |
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Black on one side slats facing the sun would get hotter by
maybe 20 degrees radiating more heat into the house
than the white side, but as Batman might tell you, black
blinds
wouldn't be esthetically pleasing to most folks. Black isn’t
a popular color to paint or accessorize houses. |
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Good thinking though myclob. [+] |
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Words and facts have meaning to some people. |
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Here's an experiment designed for elementary school kids.
(link)
Maybe you can have a juice box after. |
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But don't bother reporting the results. I know how this one
turns out. |
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There's a lot of factors that affect the temperature
of a
structure's interior. Climate zone, micro-climate,
slab on
grade or raised floor, R value of the insulation,
infiltration base,
(gaps in
the envelope like around wall penetrations like
doors and
windows) shading like your overhang, orientation
to the
sun etc but probably the biggest is glazing. |
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I used to specify low emissivity coatings as one of
my
tools to get a building to comply with Title-24
energy
compliance regulations. Emissivity is the abilty of
materials to radiate heat. Reflective stuff has low
E, dark
stuff has high E. |
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The U-value of the glass is also another big factor
which is
why double glazing is pretty standard now. |
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God how boring. No wonder I gave the business
away to a relative and
got into music to make a living. |
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Metal colored would be more effective. |
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//got into music to make a living// Yes I can see it now! |
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Scene: on stage in a stadium, Dr. and the Remulacs strike into their best-loved hit while the crowd of 50,000 marketing analysts and building fitters go wild:
<electric guitar riffs> chugga chugga chugga pop!
The U-value of glass
hup! hup! hup! hup!
is another big factor
<crowd screams so loud they drown out the music>
which is why double glay-ay-ay-ay-zing
tsh-tsh-tsh-tsh
is pretty a maaaaaaaaaaaaaaaaaaaaaaaay
<pause>
Zing!
<wild guitar solo>
<screaming into mic>it's pretty standard now
danna doo ee ooo boo wappa eeeeeee... |
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[Doc]'s right. Blinds are terrible at controlling convection currents out a single pane uncoated hole in the wall. The recommendations are for well fitting (seal around window edges), full length double lined curtains. Overheating is a different story, planting and seasonal shade cloths. |
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Of course, the option of increasing power usage is always an option, if it is a green enough source. Go SMRs. |
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Then again, does the human body need a cold cycle at night. The weather certainly does. |
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Poc, I remember that! Good show. At the meet-n-
greet backstage with the radio stations, record store
reps and magazine reporters we all talked about
HVAC efficiency
and ductwork static pressure. The groupies all
brought their ductulators to be autographed. Ahh
memories. |
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Well, my two cents, it was a great idea, just maybe slightly
baked. Certainly NWKTE. |
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