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I hate imperial units

P

Phil Hobbs

Joerg said:
Our neighbor is a civil engineer.

Wow, never met one of those. But I do know some mechanical engineers
who seem surprisingly lifelike.*

Cheers,

Phil Hobbs

(*) and some software engineers who are usually paged out to disc.
 
J

John Larkin

What about the aluminum? Doesn't the heat flow lag the temperature input?

Thanks,
Rich

That's a capacitor, at least if temperature is voltage and heat flow
is current. Anyhow, there are no dual reactances, so thermal systems
don't oscillate, ring, or overshoot.

John
 
A

Arlet

Spehro said:
Units of thermal conductivity: BTU*in/(ft^2*h*°F)

ugh

http://www.gordonengland.co.uk/conversion/thermcon.htm

Steel alloy (4140 like) is around 200, or around 30 in the more
sensible metric system units: W/(m*K)

There's a GNU 'units' program that can do all kinds of units
conversions very easily. Just type the expression of what you have, and
another expression of what you want, and it provides the scaling
factor.

For example, translating the speed of light into furlongs/fortnight is
just a matter of:

% units
2438 units, 71 prefixes, 32 nonlinear units

You have: 1 c
You want: furlongs/fortnight
* 1.8026175e+12
/ 5.5474886e-13

See http://www.gnu.org/software/units/
 
P

przemek klosowski

Units of thermal conductivity: BTU*in/(ft^2*h*°F)

ugh

http://www.gordonengland.co.uk/conversion/thermcon.htm

Steel alloy (4140 like) is around 200, or around 30 in the more sensible
metric system units: W/(m*K)

Me three, but help is on the way. My favorite 'units' program (comes
with Linux, and you can get a Windows version from e.g. Marv Klotz's site
http://www.myvirtualnetwork.com/mklotz/

You have: 200 btu*in/(ft^2*hr*degF)
You want: W/m K
* 28.845578
/ 0.034667359

Interestingly, Google has a built-in calculator with units conversion
(try searching for '160 pounds * 4000 feet in Calories') but I couldn't
get it to parse the above.
 
R

redbelly

confused said:
To be honest, that is one (more) thing about the U.S. of A. that surprises me.
While you have over the centuries appeared more than eager to throw off the
vestiges of your anglo antecedents, you cling to their antiquated weights and
measures system (incorporating some aberrations like gallons).

I grew up in the imperial system, faced conversion to metric-cgs in the early
60's and subsequently to metric-mks. In many areas I am now fluently
dimensionally tri-lingual - but I stll see people's height in imperial units.


If the US is determined (has determined?) not to change to SI units "any time
soon", then certainly exposure to both systems is a must.

Exposure to metric units happens in science classes. Exposure to
imperial units happens outside of science class (with the exception of
a few "units conversion examples" given near the beginning of the
term).

Mark
 
K

krw

Wow, never met one of those. But I do know some mechanical engineers
who seem surprisingly lifelike.*

Cheers,

Phil Hobbs

(*) and some software engineers who are usually paged out to disc.

;-))

Anyone remember the NYNEX yellow-pages commercial with the guys
running a toy train in their striped uniforms, sipping tea with
pinkies extended; Civil Engineer.
 
R

redbelly

krw said:
Anyone remember the NYNEX yellow-pages commercial with the guys
running a toy train in their striped uniforms, sipping tea with
pinkies extended; Civil Engineer.

Sure do. "There's no substitute for a well-oiled caboose!" LOL.

Mark
 
J

Joerg

krw wrote:


[ ... ]
Amazingly my house is perfectly square (just had it measured for
carpeting and was surprised how close he had to measure). THere is
one wall that is embarrassingly out of plumb though.

Our house is a designer house, Jetson's style from the early 70's. These
were the days when they deliberatly made rooms non-square. Hallways
turning off 55 degrees, meaning 27.5 degree cuts and the portions have
to line up there. But they also have to line up at the other end where
it also turns .... IOW a tile setter's nightmare.

The good thing is a 2" concrete bed over the raised foundation floor.
Very solid and you don't really have to worry where the beams are. That
must have been an expensive feature.

Sharpies or wax pencils work. They do tend to wash off the glazed
surfaces though. I'm normally done cutting by then.

Exactly. One minute dry time and then you can still see the outer
borders of that Sharpie line by the end of the cut.

Fortunately I'm done tiling in this house. I just finished the
mantle (really a 3" thick concrete and marble tile slab) over the
wood stove. Gotta pack away the wet saw and the tools...

I am going to have to do two more bathrooms. Some day. Not looking
forward to it.
 
J

Joerg

Phil said:
Wow, never met one of those. But I do know some mechanical engineers
who seem surprisingly lifelike.*

At the university I hung out mostly with MEs. They were less "nerdy" and
they could pack in quite a few brewskys. They didn't understand us EE
guys but that didn't matter. I raised the stock for EEs big time when
the stereo went during a party. Other than lots of beer all they had was
a few inbus wrenches. So I heated one up on the stove, grabbed it with
pliers and mended a broken solder joint. All while heavily under the
influence of Guinness.
 
Joerg said:
krw wrote:


[ ... ]
Amazingly my house is perfectly square (just had it measured for
carpeting and was surprised how close he had to measure). THere is
one wall that is embarrassingly out of plumb though.

Our house is a designer house, Jetson's style from the early 70's. These
were the days when they deliberatly made rooms non-square. Hallways
turning off 55 degrees, meaning 27.5 degree cuts and the portions have
to line up there. But they also have to line up at the other end where
it also turns .... IOW a tile setter's nightmare.

The good thing is a 2" concrete bed over the raised foundation floor.
Very solid and you don't really have to worry where the beams are. That
must have been an expensive feature.

Sharpies or wax pencils work. They do tend to wash off the glazed
surfaces though. I'm normally done cutting by then.

Exactly. One minute dry time and then you can still see the outer
borders of that Sharpie line by the end of the cut.

Fortunately I'm done tiling in this house. I just finished the
mantle (really a 3" thick concrete and marble tile slab) over the
wood stove. Gotta pack away the wet saw and the tools...

I am going to have to do two more bathrooms. Some day. Not looking
forward to it.



How many bathrooms do you *have*? If it's much more than two, maybe
you really should consider subbing it out...?

Michael
 
J

Joerg

krw said:
Hmm, I simply cut the molding back and don't sweat the silly
millimeters. That's what molding is for!

If you have a jamb saw. I didn't and the molding was glued in place. Arrgh!

My boiler is 125K BTU/hr, so I can easily scale from there. ;-)

Wow! That's more powerful than our wood stove. The propane furnace has
125k but with today's inflationary propane prices that can slurp up
money faster than anything. So we don't use it much.

Except for the coldest winter days we can run the wood stove at a lean
15k and it keeps it nice and cozy.
 
J

Joerg

Joerg said:
krw wrote:


[ ... ]

If it's any consolation I also had to fudge the hallway. Did the kitchen
first and calculated it all so the 1/2-tile symmetries came out nicely.
I had no choice but to either compromise the kitchen or fudge the (long)
hallway because its end is almost 1/2" off track. Opted for making the
kitchen perfect because that's where everybody always hangs out.


Amazingly my house is perfectly square (just had it measured for
carpeting and was surprised how close he had to measure). THere is
one wall that is embarrassingly out of plumb though.

Our house is a designer house, Jetson's style from the early 70's. These
were the days when they deliberatly made rooms non-square. Hallways
turning off 55 degrees, meaning 27.5 degree cuts and the portions have
to line up there. But they also have to line up at the other end where
it also turns .... IOW a tile setter's nightmare.

The good thing is a 2" concrete bed over the raised foundation floor.
Very solid and you don't really have to worry where the beams are. That
must have been an expensive feature.


I generally transfer the pin gauge info to full page label paper, cut
out and stick to the tile, where it stays while I wet saw ;-)


I did it the Sharpie way :)


Sharpies or wax pencils work. They do tend to wash off the glazed
surfaces though. I'm normally done cutting by then.

Exactly. One minute dry time and then you can still see the outer
borders of that Sharpie line by the end of the cut.


Fortunately I'm done tiling in this house. I just finished the
mantle (really a 3" thick concrete and marble tile slab) over the
wood stove. Gotta pack away the wet saw and the tools...

I am going to have to do two more bathrooms. Some day. Not looking
forward to it.


How many bathrooms do you *have*? If it's much more than two, maybe
you really should consider subbing it out...?

3-1/2. I never understood why a house needs this many but they were
there when we bought it. Subbing out bath remodels gets really
expensive. And you have to pay all that labor with after-tax money.

I got pretty good at laying tile. That certainly does not mean I enjoy
it. It's hard on your back but a bathroom isn't such a large project.
Unless the missus wants all the vanity cabinets re-tiled which was the
case for one of them.
 
R

Rich Grise

Mantel? ;-)

How many bathrooms do you *have*? If it's much more than two, maybe
you really should consider subbing it out...?

Many moons ago, I nailed an incredibly sweet contract, and I went nuts -
I bought a 4-bedroom condo that had had a wall ripped out so it had
2 regular bedrooms and one double-sized, and two bathrooms, upstairs.
Downstairs, there was a little half-bath right off the entryway. I was
bragging about my new purchase, and I said, "I got three toilets!" Some
guy said, "Now all you need is three assholes!"

I laughed. :)

Cheers!
Rich
 
J

John B

There's a GNU 'units' program that can do all kinds of units
conversions very easily. Just type the expression of what you have,
and another expression of what you want, and it provides the scaling
factor.

For example, translating the speed of light into furlongs/fortnight is
just a matter of:

% units
2438 units, 71 prefixes, 32 nonlinear units

You have: 1 c
You want: furlongs/fortnight
* 1.8026175e+12
/ 5.5474886e-13

See http://www.gnu.org/software/units/

This little tool is very useful if you have to use Mickey$oft Windoze.

http://joshmadison.net/software/convert/
 
I

Ian

How many bathrooms do you *have*? If it's much more than two, maybe
you really should consider subbing it out...?

Michael

Rule of thumb: number of bathrooms = number of women in the house,
plus 1/2 or a discreetly located bit of shrubbery.

;-)

Regards
Ian
 
K

krw

If you have a jamb saw. I didn't and the molding was glued in place. Arrgh!

Ouch! Mine is nailed in place. I simply pulled it all down,
filled the holes, stained and polyurethaned it, cut the bottoms to
size and put it all back up (pneumatic nailers are fantastic
things). I had to do the base molding anyway.
Wow! That's more powerful than our wood stove. The propane furnace has
125k but with today's inflationary propane prices that can slurp up
money faster than anything. So we don't use it much.

Our wood stove will drive us out of the house if it's above 0F, so
we only use it in Jan/Feb. On the coldest days the boiler, if run
without the wood stove, will run about a 50% duty cycle. I'd go
broke on propane here. I switched from oil to natural gas about
ten years ago.
Except for the coldest winter days we can run the wood stove at a lean
15k and it keeps it nice and cozy.

The coldest days here are -20F (nights have gotten down to -40).
:-(
 
K

krw

Mantel? ;-)

You'll have that (damn speel chequers and homophones).
Many moons ago, I nailed an incredibly sweet contract, and I went nuts -
I bought a 4-bedroom condo that had had a wall ripped out so it had
2 regular bedrooms and one double-sized, and two bathrooms, upstairs.
Downstairs, there was a little half-bath right off the entryway. I was
bragging about my new purchase, and I said, "I got three toilets!" Some
guy said, "Now all you need is three assholes!"

I have 2-1/2 baths in a 3 bedroom house. Well, the town thinks it's
only a two bedroom and it's going to cost me $4K to pay off the
town.
I laughed. :)

I didn't.
 
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