Re: [bolger] Re: paint -- was Bolger 5
They still are.
The difference between their reflectivity and perfection is the heat put
into the paint/seat/boat. The conduction determines the rate at which it
will come back out to raise the temperature of your swim trunks despite the
efforts of your sweat. Poor conduction is good insulation is more
comfortable to sit on.
Like I say, they claim to do both well, but they probably don't do as well
at reflection as 3M's "Scotchbrite" paint does in the visible range.
NASA needs ceramic because they get into some wholly excessive temperatures.
Since we don't, I wonder if glass or phenolic microballoons would work.
Roger
derbyrm@...
http://home.earthlink.net/~derbyrm
The difference between their reflectivity and perfection is the heat put
into the paint/seat/boat. The conduction determines the rate at which it
will come back out to raise the temperature of your swim trunks despite the
efforts of your sweat. Poor conduction is good insulation is more
comfortable to sit on.
Like I say, they claim to do both well, but they probably don't do as well
at reflection as 3M's "Scotchbrite" paint does in the visible range.
NASA needs ceramic because they get into some wholly excessive temperatures.
Since we don't, I wonder if glass or phenolic microballoons would work.
Roger
derbyrm@...
http://home.earthlink.net/~derbyrm
----- Original Message -----
From: "Howard Stephenson" <stephensonhw@...>
> Reflection and conduction were two different things when I was at
> school, but that was a long time ago...
>
> Howard
>
> --- Inbolger@yahoogroups.com, "Roger Derby" <derbyrm@e...> wrote:
>> Isn't that two views of the same thing. They stress both
> reflectivity and
>> "insulation" on their web site. Both are good for the cockpit
> seats -- less
>> energy absorbed, and less heat released to the sitter.
>>
>> ----- Original Message -----
>> From: "Howard Stephenson" <stephensonhw@a...>
>>
>>
>> > Maybe, but my understanding was that it reflects heat rather than
>> > reducing conductivity at the surface.
>> >
>> > --- Inbolger@yahoogroups.com, "Roger Derby" <derbyrm@e...>
> wrote:
>> >> That looks like neat stuff! Sort of like the "Cool Deck"
> people put
>> >> around swimming pools in Phoenix. That stuff gets hot in the
> sun,
>> >> just like concrete, but the thermal conductivity is so low that
> it
>> >> doesn't burn your feet.
>
>
>
>
>
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Reflection and conduction were two different things when I was at
school, but that was a long time ago...
Howard
school, but that was a long time ago...
Howard
--- Inbolger@yahoogroups.com, "Roger Derby" <derbyrm@e...> wrote:
> Isn't that two views of the same thing. They stress both
reflectivity and
> "insulation" on their web site. Both are good for the cockpit
seats -- less
> energy absorbed, and less heat released to the sitter.
>
> ----- Original Message -----
> From: "Howard Stephenson" <stephensonhw@a...>
>
>
> > Maybe, but my understanding was that it reflects heat rather than
> > reducing conductivity at the surface.
> >
> > --- Inbolger@yahoogroups.com, "Roger Derby" <derbyrm@e...>
wrote:
> >> That looks like neat stuff! Sort of like the "Cool Deck"
people put
> >> around swimming pools in Phoenix. That stuff gets hot in the
sun,
> >> just like concrete, but the thermal conductivity is so low that
it
> >> doesn't burn your feet.
Peter,
Enjoy the cool weather, because it is hot a jell (Spanish) here in
Texas.
Bryan Swinney
Enjoy the cool weather, because it is hot a jell (Spanish) here in
Texas.
Bryan Swinney
It won't radiate unless it's warmer than the ambient. Wouldn't that be some
improvement?
Roger
derbyrm@...
http://home.earthlink.net/~derbyrm
improvement?
Roger
derbyrm@...
http://home.earthlink.net/~derbyrm
----- Original Message -----
From: "Will Samson" <willsamson@...>
> Reading with bemusement all this stuff about paint colours that suck in
> solar heat, and how to avoid it.
>
> Sheesh! If only I could suck in some heat from our cold, damp grey skies
> here in Bonnie Scotland! D'you think if I painted my boat black it'd be
> toasty warm inside?
>
> [Don't bother answering - I think I already know the answer to that one;
> good heat absorber = good heat radiator]
Isn't that two views of the same thing. They stress both reflectivity and
"insulation" on their web site. Both are good for the cockpit seats -- less
energy absorbed, and less heat released to the sitter.
Roger
derbyrm@...
http://home.earthlink.net/~derbyrm
"insulation" on their web site. Both are good for the cockpit seats -- less
energy absorbed, and less heat released to the sitter.
Roger
derbyrm@...
http://home.earthlink.net/~derbyrm
----- Original Message -----
From: "Howard Stephenson" <stephensonhw@...>
> Maybe, but my understanding was that it reflects heat rather than
> reducing conductivity at the surface.
>
> --- Inbolger@yahoogroups.com, "Roger Derby" <derbyrm@e...> wrote:
>> That looks like neat stuff! Sort of like the "Cool Deck" people put
>> around swimming pools in Phoenix. That stuff gets hot in the sun,
>> just like concrete, but the thermal conductivity is so low that it
>> doesn't burn your feet.
>> I figure the best solution might be a nice bright tartan paint jobtogether with some red woolies under the kilt:-) >>
As any true Scotsman will tell you - "There's nothing worn under the kilt; it's all in good working order!"
;-]
Bill
[Non-text portions of this message have been removed]
--- Inbolger@yahoogroups.com, "Will Samson" <willsamson@y...> wrote:
it'd be toasty warm inside?
I figure the best solution might be a nice bright tartan paint job
together with some red woolies under the kilt:-)
http://www.tartans.scotland.net/find_tartan.cfm
Nels
> Sheesh! If only I could suck in some heat from our cold, damp greyskies here in Bonnie Scotland! D'you think if I painted my boat black
it'd be toasty warm inside?
>Well Bill,
I figure the best solution might be a nice bright tartan paint job
together with some red woolies under the kilt:-)
http://www.tartans.scotland.net/find_tartan.cfm
Nels
--- Inbolger@yahoogroups.com, "Will Samson" <willsamson@y...> wrote:
You tell 'em Willa :-)
Sincerely,
Peter Lenihan,no stranger to cold damp and grey but especially
cold....and it but a few months away,yikes!
> Sheesh! If only I could suck in some heat from our cold, damp greyskies here in Bonnie Scotland!
You tell 'em Willa :-)
Sincerely,
Peter Lenihan,no stranger to cold damp and grey but especially
cold....and it but a few months away,yikes!
Reading with bemusement all this stuff about paint colours that suck in solar heat, and how to avoid it.
Sheesh! If only I could suck in some heat from our cold, damp grey skies here in Bonnie Scotland! D'you think if I painted my boat black it'd be toasty warm inside?
[Don't bother answering - I think I already know the answer to that one;
good heat absorber = good heat radiator]
Sigh!
Bill
[Non-text portions of this message have been removed]
Sheesh! If only I could suck in some heat from our cold, damp grey skies here in Bonnie Scotland! D'you think if I painted my boat black it'd be toasty warm inside?
[Don't bother answering - I think I already know the answer to that one;
good heat absorber = good heat radiator]
Sigh!
Bill
[Non-text portions of this message have been removed]
Roger,
Many years ago, the petroleum industry ran some test to reduce the
absorption of solar heat, so that hydrocarbon evaporation would be
reduced. The best reflector of solar radiation was gloss white, with
flat white and gloss aluminum being approximately 10% less efficient.
All darker colors such as black, dark blue, dark green and such are the
worst at absorbing solar radiation. I did a bit of research on the
internet, but was unable to find any thing that was exhaustive in
establishing the degree of color efficiency in reflecting solar energy.
Bryan Swinney
Many years ago, the petroleum industry ran some test to reduce the
absorption of solar heat, so that hydrocarbon evaporation would be
reduced. The best reflector of solar radiation was gloss white, with
flat white and gloss aluminum being approximately 10% less efficient.
All darker colors such as black, dark blue, dark green and such are the
worst at absorbing solar radiation. I did a bit of research on the
internet, but was unable to find any thing that was exhaustive in
establishing the degree of color efficiency in reflecting solar energy.
Bryan Swinney
Maybe, but my understanding was that it reflects heat rather than
reducing conductivity at the surface.
Howard
reducing conductivity at the surface.
Howard
--- Inbolger@yahoogroups.com, "Roger Derby" <derbyrm@e...> wrote:
> That looks like neat stuff! Sort of like the "Cool Deck" people put
around
> swimming pools in Phoenix. That stuff gets hot in the sun, just
like
> concrete, but the thermal conductivity is so low that it doesn't
burn your
> feet.
That looks like neat stuff! Sort of like the "Cool Deck" people put around
swimming pools in Phoenix. That stuff gets hot in the sun, just like
concrete, but the thermal conductivity is so low that it doesn't burn your
feet.
Roger
derbyrm@...
http://home.earthlink.net/~derbyrm
swimming pools in Phoenix. That stuff gets hot in the sun, just like
concrete, but the thermal conductivity is so low that it doesn't burn your
feet.
Roger
derbyrm@...
http://home.earthlink.net/~derbyrm
----- Original Message -----
From: "Howard Stephenson" <stephensonhw@...>
To: <bolger@yahoogroups.com>
Sent: Friday, August 12, 2005 4:37 PM
Subject: [bolger] Re: paint -- was Bolger 5
> At these two sites you'll see a product that should increase heat
> reflection. Apparently it can be added to "any" paint:
>
>http://alsnetbiz.com/insulate/additive.html
>
>http://www.hytechadditive.com/
>
> As I've mentioned here before, PCB recommended using aluminum paint on
> the topsides but this was, I think, more for economy and durability
> rather than heat reflectivity -- or looks.
>
> Howard
>
> --- Inbolger@yahoogroups.com, "Roger Derby" <derbyrm@e...> wrote:
>> Does anyone have any idea where "spectral reflectivity" could be
>> found for various paints?
At these two sites you'll see a product that should increase heat
reflection. Apparently it can be added to "any" paint:
http://alsnetbiz.com/insulate/additive.html
http://www.hytechadditive.com/
As I've mentioned here before, PCB recommended using aluminum paint on
the topsides but this was, I think, more for economy and durability
rather than heat reflectivity -- or looks.
Howard
reflection. Apparently it can be added to "any" paint:
http://alsnetbiz.com/insulate/additive.html
http://www.hytechadditive.com/
As I've mentioned here before, PCB recommended using aluminum paint on
the topsides but this was, I think, more for economy and durability
rather than heat reflectivity -- or looks.
Howard
--- Inbolger@yahoogroups.com, "Roger Derby" <derbyrm@e...> wrote:
> Does anyone have any idea where "spectral reflectivity" could be
found for
> various paints?
Does anyone have any idea where "spectral reflectivity" could be found for
various paints?
A few years (oops, decades) ago, I had a project that generated and focused
intense heat. The reflectors were silver plated, which worked, but was
costly. People kept suggesting chrome plating to save money. (The heat
guns went bad regularly.) This did not work (reflector melted).
So, the color and the thermal reflectivity connection isn't as obvious as I
expected. Sure, flat black absorbs, and gloss white reflects, blindingly,
but in between? Maybe bluish off-white is hotter than reddish?
Roger
derbyrm@...
http://home.earthlink.net/~derbyrm
various paints?
A few years (oops, decades) ago, I had a project that generated and focused
intense heat. The reflectors were silver plated, which worked, but was
costly. People kept suggesting chrome plating to save money. (The heat
guns went bad regularly.) This did not work (reflector melted).
So, the color and the thermal reflectivity connection isn't as obvious as I
expected. Sure, flat black absorbs, and gloss white reflects, blindingly,
but in between? Maybe bluish off-white is hotter than reddish?
Roger
derbyrm@...
http://home.earthlink.net/~derbyrm
----- Original Message -----
From: "willers32" <mwagner@...>
To: <bolger@yahoogroups.com>
Sent: Friday, August 12, 2005 2:16 PM
Subject: [bolger] Re: Bolger5
> --- Inbolger@yahoogroups.com, Bruce Hallman <bruce@h...> wrote:
>
>> Choosing a color (scheme) is one of the toughest parts
>> of building boats for several reasons IMO.
<snip>
>> Looking around the marinas where I live, essentially all
>> the boats are white, and is it a coincidence that they
>> all also appear to be stamped out of plastic using
>> the same factory mold? Conformists?
>>
> Absolutely. A Bolger box need not conform to anybody's preconceived
> notion of what a boat should look like. My AS-29 is painted a color
> called "Lush Grass." I picked it 'cause I'm partial to green, and this
> is a particularly rich green. It does have one major drawback. It
> soaks up heat from the sun like crazy, to the point I'm considering
> adding some insulation inside.
>
> This may very well be the reason so many boats are white...