Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Meade Dillon via Mercedes]

Mitch, I'm in North Charleston, not far from Park Circle (the station I
use).

Thanks for that DP calculator link, looks to be a pretty useful site!

-
Max
Charleston SC
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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Mitch Haley via Mercedes]

> On August 10, 2016 at 11:45 AM Meade Dillon via Mercedes
>  wrote:
> 
> 
> Well the cheapo meter is poorly placed, sitting in the sun on the passenger
> seat, so these readings are suspect:  23% humidity, 120 deg F.

73° dew point, that's pretty wet if accurate. 
http://www.dpcalc.org/

Accuweather says DP is 76° in Charleston. I forget, where are you?

Mitch.

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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Meade Dillon via Mercedes]

Dew point outside the car?  Now at 79.2 deg F, with humidity at 84%.

"When moisture content stays constant and temperature goes up, relative
humidity
goes down but dew point stays the same."

That would explain what I'm observing, but I don't have the dew point for
the interior of the car.

-
Max
Charleston SC

On Wed, Aug 10, 2016 at 3:50 PM, Mitch Haley via Mercedes <
mercedes@okiebenz.com> wrote:

>
> I'd be more interested in dew point than relative humidity. It sounds like
> dew
> point of ambient air is a couple of degrees below ambient temp, but how
> much
> drier is it inside the car?
> When moisture content stays constant and temperature goes up, relative
> humidity
> goes down but dew point stays the same.
>
> Mitch.
>
>
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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Mitch Haley via Mercedes]

> On August 10, 2016 at 11:37 AM Meade Dillon via Mercedes
>  wrote:
> 
> 
> This a.m. the humidity in the car measured 45% when I parked at work.
> According to the weather underground website, ambient humidity is now at
> 96%.  I'm going to check the car interior humidity (reading the meter from
> outside the car) in a little bit.

I'd be more interested in dew point than relative humidity. It sounds like dew
point of ambient air is a couple of degrees below ambient temp, but how much
drier is it inside the car?
When moisture content stays constant and temperature goes up, relative humidity
goes down but dew point stays the same. 

Mitch.

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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Meade Dillon via Mercedes]

Well the cheapo meter is poorly placed, sitting in the sun on the passenger
seat, so these readings are suspect:  23% humidity, 120 deg F.

-
Max
Charleston SC

On Wed, Aug 10, 2016 at 11:37 AM, Meade Dillon  wrote:

> This a.m. the humidity in the car measured 45% when I parked at work.
> According to the weather underground website, ambient humidity is now at
> 96%.  I'm going to check the car interior humidity (reading the meter from
> outside the car) in a little bit.
>
> -
> Max
> Charleston SC
>
>
>
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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Meade Dillon via Mercedes]

This a.m. the humidity in the car measured 45% when I parked at work.
According to the weather underground website, ambient humidity is now at
96%.  I'm going to check the car interior humidity (reading the meter from
outside the car) in a little bit.

-
Max
Charleston SC
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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Floyd Thursby via Mercedes]

I'll get the parts list later.  Basically a little Arduino, a temp/humid 
sensor, and a small 2-line LCD display.  You have to write some code and 
program the Arduino but that is pretty easy using code on Adafruit you 
can pretty much cut/paste with some minor jiggering.  Put the 
programming environment on your PC, plug in the Arduino to a USB port, 
then shoot the program to it, it runs.


Or look here for the stuff (bit more expensive than your chinee 
supplier, but probably decent quality). https://www.adafruit.com/categories


--FT


On 8/9/16 1:33 PM, Curley McLain via Mercedes wrote:

Is there a link to  the parts list and how to?   Sounds useful!

on another front:  I came across the basic stamp and breadboard I used 
to make an ultrasonic rangefinder 20 years ago



Floyd Thursby via Mercedes 
August 9, 2016 at 11:01 AM
I have a little temp/humidity sensor on an Arduino and a display to 
show both.  Easy enough to make one, you can leave it in the car and 
run off 12V.  Probably $12 in parts from chinee sources, you could 
embed the display in your dash somewhere, make it look "factory."


--FT



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--
--FT


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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Craig via Mercedes]

On Tue, 9 Aug 2016 11:21:46 -0500 OK Don via Mercedes
 wrote:

> I like the cool air between 7500 and 10,500 feet better -

We had that at home in Los Alamos. :-)


Craig

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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Curley McLain via Mercedes]

Is there a link to  the parts list and how to?   Sounds useful!

on another front:  I came across the basic stamp and breadboard I used 
to make an ultrasonic rangefinder 20 years ago



Floyd Thursby via Mercedes 
August 9, 2016 at 11:01 AM
I have a little temp/humidity sensor on an Arduino and a display to 
show both.  Easy enough to make one, you can leave it in the car and 
run off 12V.  Probably $12 in parts from chinee sources, you could 
embed the display in your dash somewhere, make it look "factory."


--FT



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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[OK Don via Mercedes]

I have several of these around the place - they record min - max as well as
current temp and humidity. They vary by up to 2 degrees sitting side by
side, but are good for deltas. At least they are consistent in their errors.

On Tue, Aug 9, 2016 at 11:01 AM, Floyd Thursby via Mercedes <
mercedes@okiebenz.com> wrote:

> I have a little temp/humidity sensor on an Arduino and a display to show
> both.  Easy enough to make one, you can leave it in the car and run off
> 12V.  Probably $12 in parts from chinee sources, you could embed the
> display in your dash somewhere, make it look "factory."
>
> --FT
>
>
>
> On 8/9/16 11:58 AM, Mountain Man via Mercedes wrote:
>
>> Max wrote:
>>
>>> The result was that once I started driving the car, the
>>> AC was able to bring the temperature and comfort level down to tolerable
>>> much more quickly.
>>>
>> Dehumidifier lowers the need for a/c.  Remove humidity and the a/c
>> systems run better.  i.e. keep the windows closed and in-car humidity
>> does not get to ambient.  I like it.
>> mao
>>
>> ___
>> http://www.okiebenz.com
>>
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>>
>> To Unsubscribe or change delivery options go to:
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>>
>>
> --
> --FT
>
>
>
> ___
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>
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>
> To Unsubscribe or change delivery options go to:
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>
>


-- 
OK Don

*“Travel is fatal to prejudice, bigotry and narrow-mindedness, and many of
our people need it sorely on these accounts.”* – Mark Twain

"There are three kinds of men: The ones that learns by reading. The few who
learn by observation. The rest of them have to pee on the electric fence
for themselves."

WILL ROGERS, *The Manly Wisdom of Will Rogers*
2013 F150, 18 mpg
2012 Passat TDI DSG, 44 mpg
1957 C182A, 12 mpg - but at 150 mph!
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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[OK Don via Mercedes]

I like the cool air between 7500 and 10,500 feet better -

On Tue, Aug 9, 2016 at 11:02 AM, Curt Raymond via Mercedes <
mercedes@okiebenz.com> wrote:

> AC is a dehumidifier or vice-versa no?
> I'm interested in seeing actual data, I'd also be interested in seeing if
> you start the car, get the AC going (not on recirculate) and open a window
> a little if the incoming air makes positive pressure inside the car to the
> point that the hot air exhausting is better than using recirculate to just
> cool the drier air inside the car.
> Lots of variables in cooling the car.
> -Curt
>
>   From: Mountain Man via Mercedes <mercedes@okiebenz.com>
>  To: Mercedes Discussion List <mercedes@okiebenz.com>
> Cc: Mountain Man <maontin@gmail.com>
>  Sent: Tuesday, August 9, 2016 11:58 AM
>  Subject: Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot
> humid climates
>
> Max wrote:
> > The result was that once I started driving the car, the
> > AC was able to bring the temperature and comfort level down to tolerable
> > much more quickly.
>
> Dehumidifier lowers the need for a/c.  Remove humidity and the a/c
> systems run better.  i.e. keep the windows closed and in-car humidity
> does not get to ambient.  I like it.
> mao
>
>

-- 
OK Don

*“Travel is fatal to prejudice, bigotry and narrow-mindedness, and many of
our people need it sorely on these accounts.”* – Mark Twain

"There are three kinds of men: The ones that learns by reading. The few who
learn by observation. The rest of them have to pee on the electric fence
for themselves."

WILL ROGERS, *The Manly Wisdom of Will Rogers*
2013 F150, 18 mpg
2012 Passat TDI DSG, 44 mpg
1957 C182A, 12 mpg - but at 150 mph!
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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Curt Raymond via Mercedes]

AC is a dehumidifier or vice-versa no?
I'm interested in seeing actual data, I'd also be interested in seeing if you 
start the car, get the AC going (not on recirculate) and open a window a little 
if the incoming air makes positive pressure inside the car to the point that 
the hot air exhausting is better than using recirculate to just cool the drier 
air inside the car.
Lots of variables in cooling the car.
-Curt

  From: Mountain Man via Mercedes <mercedes@okiebenz.com>
 To: Mercedes Discussion List <mercedes@okiebenz.com> 
Cc: Mountain Man <maontin@gmail.com>
 Sent: Tuesday, August 9, 2016 11:58 AM
 Subject: Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid 
climates
   
Max wrote:
> The result was that once I started driving the car, the
> AC was able to bring the temperature and comfort level down to tolerable
> much more quickly.

Dehumidifier lowers the need for a/c.  Remove humidity and the a/c
systems run better.  i.e. keep the windows closed and in-car humidity
does not get to ambient.  I like it.
mao

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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Floyd Thursby via Mercedes]

I have a little temp/humidity sensor on an Arduino and a display to show 
both.  Easy enough to make one, you can leave it in the car and run off 
12V.  Probably $12 in parts from chinee sources, you could embed the 
display in your dash somewhere, make it look "factory."


--FT


On 8/9/16 11:58 AM, Mountain Man via Mercedes wrote:

Max wrote:

The result was that once I started driving the car, the
AC was able to bring the temperature and comfort level down to tolerable
much more quickly.

Dehumidifier lowers the need for a/c.  Remove humidity and the a/c
systems run better.  i.e. keep the windows closed and in-car humidity
does not get to ambient.  I like it.
mao

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--
--FT


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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Mountain Man via Mercedes]

Max wrote:
> The result was that once I started driving the car, the
> AC was able to bring the temperature and comfort level down to tolerable
> much more quickly.

Dehumidifier lowers the need for a/c.  Remove humidity and the a/c
systems run better.  i.e. keep the windows closed and in-car humidity
does not get to ambient.  I like it.
mao

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Re: [MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Craig via Mercedes]

On Tue, 9 Aug 2016 08:42:06 -0400 Meade Dillon via Mercedes
 wrote:

> The major difference was that humidity levels in the car were not
> ambient (80% and higher) but seemed to stay much lower.  The result was
> that once I started driving the car, the AC was able to bring the
> temperature and comfort level down to tolerable much more quickly.
> 
> I just purchased a cheapo hygrometer on Amazon that I'm going to use to
> get some data, see if my theory is confirmed.

Interesting! Let us know how it turns out.


Craig

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[MBZ] OT more Car / Mercedes talk - keeping cool in hot humid climates

[Meade Dillon via Mercedes]

A few weeks ago after my thread about window tint and keeping kühl, I
decided to try a little experiment.  I stopped cracking the windows and
sunroof while parked, but continued to put the sunshade in the windshield.
When I did drive the car, I kept the AC on recirculation and blasting full
fan and set at minimum temperature.

In-car temperatures would get up to about 110 deg F or so, by the end of
the work day, parked in an asphalt lot.  The major difference was that
humidity levels in the car were not ambient (80% and higher) but seemed to
stay much lower.  The result was that once I started driving the car, the
AC was able to bring the temperature and comfort level down to tolerable
much more quickly.

I just purchased a cheapo hygrometer on Amazon that I'm going to use to get
some data, see if my theory is confirmed.
-
Max
Charleston SC
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