Date: Wed Feb 20 16:31:24 2008 Back to Contents

Author: Bill Norwood

Subject: Re: Wanted: Source for Ice Water Dispenser

Post:
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Interesting option and calculations, Bernard -

for now I will file it with the rest,

until we can put something together.

Many thanks, Bill



_____

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Bernard Cleyet
Sent: Tuesday, February 19, 2008 12:40 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Wanted: Source for Ice Water Dispenser



Perhaps "dry ice" would be better? Its "cooling capacity" is ~ 571 kJ/kg +
v.~ 80 K times 0.85 kJ/(kg K) While ice is 334 kJ/kg. The necessary
"cooling" is ~84 kJ/kg [20 C => 0]



The factors are cost, convenience, and availability?



bc



On 2008, Feb 19, , at 05:58, Bill Norwood wrote:






Thanks, Beth for your response - we are considering it



Thanks Dan, but we do have 3 hours between the starts of these labs,

and we would just have to make sure that we would have

a full 24 liters of water fully cooled by lab time.



Bill



_____

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Beth Stoeckly
Sent: Monday, February 18, 2008 6:47 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Wanted: Source for Ice Water Dispenser



How often do you do this lab? How about a large car-camping size ice chest.
Fill it with bags of ice from the grocery store and run water over it. Get
the ice water out through the drain hole. And you could still use it for
camping the rest of the year.





_____

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Dan Bernoulli
Sent: Saturday, February 16, 2008 3:15 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Wanted: Source for Ice Water Dispenser





You might want ot consider the energy/power it takes to cool the water.
Assuming you start at room temperature 6 or 7 gallons of water will require
something around 3kw at 100% efficencey to cool in fifteen minutes. This is
way beyond the capabiiites of a standard refrigerator. Hope I got the math
right or abuse is sure to follow : )

Dan Beeker

>
> -----Original Message-----
> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
> Behalf Of Perry R Godwin
> Sent: Thursday, February 14, 2008 9:06 AM
> To: tap-l@lists.ncsu.edu
> Subject: Re: [tap-l] Wanted: Source for Ice Water Dispenser
>
> What about using a modified beer keg refrigerator/dispenser?
>
> Perry Godwin, Head Physics Lab Technician
> Lansing Community College
> Email: godwip@lcc.edu
> Work: (517) 483-9653
> Cell: (517) 927-2155
> Pgr: (517) 232-0278
> Fax: (517) 483-1003
>
> -----Original Message-----
> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
> Behalf Of Bill Norwood
> Sent: Thursday, February 14, 2008 8:52 AM
> To: tap-l@lists.ncsu.edu
> Cc: teg@physics.umd.edu; 'Allen Monroe'
> Subject: Re: [tap-l] Wanted: Source for Ice Water Dispenser
>
> Thanks, Machele, we are considering that. Apparently refrigerators set on
> "high" will bring water down to freezing or near freezing in the main
> compartment. So we place a 30-50 gallon tank in the fridge, then cut a
hole
> through the door for a from-the-tank hose and a dispenser mounting, Or, we
> could take a fridge which already dispenses cold water and rig it up for
> dispensing a much larger volume. Then, if we want to do a really good job,
> we do a hook-up to the water supply. My hope had been that some company
> already manufactures such an item. We'll see.
> Thanks. Bill Norwood
>
> -----Original Message-----
> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
> Behalf Of Machele Kindle
> Sent: Wednesday, February 13, 2008 8:01 PM
> To: tap-l@lists.ncsu.edu
> Subject: Re: [tap-l] Wanted: Source for Ice Water Dispenser
>
> An obvious question: can you put a refrigerator or freezer in the lab?
>
> Chele
>
> Bill Norwood wrote:
> > Hi Taplers,
> >
> > For our revised Charles' Law Expt, where students will fill deep fryers
> with
> > ice water, then bring it to a gentle boil, it would hugely save on labor
> if
> > we could identify a unit which handily puts out 6 or 7 gallons of ice
> water
> > (1-4 deg C) within 15 minutes, and will do the same thing again after 3
> > hours when the next lab starts. I just learned from the "ice and cold
> water
> > people" that that might be an unusual object.
> >
> > Got any ideas?
> >
> > Many thanks,
> >
> > Bill Norwood
> > Technician, Physics Elementary Labs
> > U of MD at College Park
> > 301-405-6006
> >
> >
> >
>
> --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> For in the end, we will conserve only what we love.
> We will love only what we understand.
> We will understand only what we are taught. - Baba Dioum
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Machele Kindle
> Graduate Student
> Ira A. Fulton School of Engineering
> Arizona State University
> (336) 408-8382
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
>
>
>

_____

Climb to the top of the charts! Play the word scramble challenge with star
power. Play now!






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Interesting option and =
calculations,
Bernard

for now I will file it with the =
rest,

until we can put something =
together.

Many thanks, =
Bill

=










From:
tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of Bernard Cleyet
Sent: Tuesday, February =
19, 2008
12:40 PM
To: =
tap-l@lists.ncsu.edu
Subject: Re: [tap-l] =
Wanted:
Source for Ice Water Dispenser





Perhaps "dry ice" would be better? Its =
"cooling
capacity" is ~ 571 kJ/kg + v.~ 80 K times 0.85 kJ/(kg K) =

While ice is 334 kJ/kg. =
The necessary "cooling" is
~84 kJ/kg [20 C =3D> 0]









The factors are cost, convenience, and =
availability?











bc











On 2008, Feb 19, , at 05:58, Bill Norwood =
wrote:












Thanks,
Beth for your response we are considering =
it











Thanks Dan, but we do have 3 hours
between the starts of these labs,





and we would just have to make =
sure that
we would have





a full 24 liters of water fully =
cooled by
lab time.











Bill



















tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.=
edu] On
Behalf Of Beth
Stoeckly
Sent: Monday, February 18, 2008 =
6:47 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Wanted: Source =
for Ice
Water Dispenser













How often do you do this lab? =
How
about a large car-camping size ice chest. Fill it with bags of ice =
from
the grocery store and run water over it. Get the ice water out through =
the
drain hole. And you could still use it for camping the rest of the =
year.

























tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.=
edu] On
Behalf Of Dan Bernoulli=

Sent: Saturday, February 16, 2008 =
3:15 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Wanted: Source =
for Ice
Water Dispenser















You might want ot consider the energy/power it takes to cool the water.
Assuming you start at room temperature 6 or 7 gallons of water will =
require
something around 3kw at 100% efficencey to cool in fifteen minutes. This =
is way
beyond the capabiiites of a standard refrigerator. Hope I got the math =
right or
abuse is sure to follow : )

Dan Beeker

>
> -----Original Message-----
> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.=
edu]
On
> Behalf Of Perry R Godwin
> Sent: Thursday, February 14, 2008 9:06 AM
> To: tap-l@lists.ncsu.edu
> Subject: Re: [tap-l] Wanted: Source for Ice Water Dispenser
>
> What about using a modified beer keg refrigerator/dispenser?
>
> Perry Godwin, Head Physics Lab Technician
> Lansing Community =
College
> Email: godwip@lcc.edu
> Work: (517) 483-9653
> Cell: (517) 927-2155
> Pgr: (517) 232-0278
> Fax: (517) 483-1003
>
> -----Original Message-----
> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.=
edu]
On
> Behalf Of Bill Norwood
> Sent: Thursday, February 14, 2008 8:52 AM
> To: tap-l@lists.ncsu.edu
> Cc: teg@physics.umd.edu; =
'Allen
Monroe'
> Subject: Re: [tap-l] Wanted: Source for Ice Water Dispenser
>
> Thanks, Machele, we are considering that. Apparently refrigerators =
set on
> "high" will bring water down to freezing or near freezing =
in the
main
> compartment. So we place a 30-50 gallon tank in the fridge, then =
cut a
hole
> through the door for a from-the-tank hose and a dispenser mounting, =
Or, we
> could take a fridge which already dispenses cold water and rig it =
up for
> dispensing a much larger volume. Then, if we want to do a really =
good job,
> we do a hook-up to the water supply. My hope had been that some =
company
> already manufactures such an item. We'll see.
> Thanks. Bill Norwood
>
> -----Original Message-----
> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.=
edu]
On
> Behalf Of Machele Kindle
> Sent: Wednesday, February 13, 2008 8:01 PM
> To: tap-l@lists.ncsu.edu
> Subject: Re: [tap-l] Wanted: Source for Ice Water Dispenser
>
> An obvious question: can you put a refrigerator or freezer in the =
lab?
>
> Chele
>
> Bill Norwood wrote:
> > Hi Taplers,
> >
> > For our revised Charles' Law Expt, where students will fill =
deep
fryers
> with
> > ice water, then bring it to a gentle boil, it would hugely =
save on
labor
> if
> > we could identify a unit which handily puts out 6 or 7 gallons =
of ice
> water
> > (1-4 deg C) within 15 minutes, and will do the same thing =
again after
3
> > hours when the next lab starts. I just learned from the =
"ice and
cold
> water
> > people" that that might be an unusual object.
> >
> > Got any ideas?
> >
> > Many thanks,
> >
> > Bill Norwood
> > Technician, Physics Elementary Labs
> > U of MD at College =
Park
> > 301-405-6006
> >
> >
> >
>
> --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> For in the end, we will conserve only what we love.
> We will love only what we understand.
> We will understand only what we are taught. - Baba Dioum
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Machele Kindle
> Graduate Student
> Ira A. Fulton School of Engineering
> Arizona State University
> (336) 408-8382
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
>
>
>











Climb to the top of the
charts! Play the word scramble challenge with star power. Play now!







<=
/u1:smarttagtype>











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