Date: Tue Feb 26 13:29:49 2008 Back to Contents

Author: Dan Bernoulli

Subject: Re: Wanted: Source for Ice Water Dispenser

Post:
--_c95dce71-a5cb-4f91-ac52-de24c45b0cb1_
Content-Type: text/plain; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

Bill,

To revisit an old topic, why not have students mix the concoction?=20

5 kg ice at 0 C + 25 kg water at 14 C. Pour into 14 gal roughneck storage b=
ox. Gently stir 5 minutes. gives ~~29.7 kg water, ~~0.3 kg ice at very clos=
e to 0 C. Adjust amounts to suit. Because of the huge heat of fusion of wat=
er, the process is somewhat independent of initial water temperature.

UGLabs rule #1: "Don't make it hard."

Dan Beeker

From: bnorwood@umd.edu
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Wanted: Source for Ice Water Dispenser
Date: Tue, 19 Feb 2008 08:58:31 -0500

Thanks, Beth for your response =96 we are considering it

=20

Thanks Dan, but we do have 3 hours
between the starts of these labs,=20

and we would just have to make sure that
we would have=20

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

=20

Bill

=20

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

=20

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.

=20

=20

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

=20

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 righ=
t or
abuse is sure to follow : )

Dan Beeker

>=20

> -----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

>=20

> What about using a modified beer keg refrigerator/dispenser?

>=20

> 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

>=20

> -----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

>=20

> 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, w=
e

> 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

>=20

> -----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

>=20

> An obvious question: can you put a refrigerator or freezer in the lab?

>=20

> Chele

>=20

> 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

> >

> >

> >

>=20

> --

> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

> 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

> Ira A. Fulton School
of Engineering

> Arizona State University

> (336) 408-8382

> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

>=20

>=20

>=20

>=20

>=20

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

_________________________________________________________________
Climb to the top of the charts!=A0Play the word scramble challenge with sta=
r power.
n=

--_c95dce71-a5cb-4f91-ac52-de24c45b0cb1_
Content-Type: text/html; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

Bill,To revisit an old topic, why not have students mix the concoct=
ion? 5 kg ice at 0 C + 25 kg water at 14 C. Pour into 14 gal roughn=
eck storage box. Gently stir 5 minutes. gives ~~29.7 kg water, ~~0.3 kg ice=
at very close to 0 C. Adjust amounts to suit. Because of the huge heat of =
fusion of water, the process is somewhat independent of initial water tempe=
rature.UGLabs rule #1: "Don't make it hard."Dan Beeker<=
br>From: bnorwood@umd.eduTo: tap-l@lists.ncsu.eduSu=
bject: Re: [tap-l] Wanted: Source for Ice Water DispenserDate: Tue, 19 =
Feb 2008 08:58:31 -0500

<=
span style=3D"font-size: 14pt; font-family: Arial; color: black;">
Thanks, Beth for your response =96 we are considering it

<=
span style=3D"font-size: 14pt; font-family: Arial; color: black;">

<=
span style=3D"font-size: 14pt; font-family: Arial; color: black;">Thanks Da=
n, but we do have 3 hours
between the starts of these labs,

<=
span style=3D"font-size: 14pt; font-family: Arial; color: black;">and we wo=
uld just have to make sure that
we would have

<=
span style=3D"font-size: 14pt; font-family: Arial; color: black;">a full 24=
liters of water fully cooled by
lab time.

<=
span style=3D"font-size: 14pt; font-family: Arial; color: black;">

<=
span style=3D"font-size: 14pt; font-family: Arial; color: black;">Bill

<=
span style=3D"font-size: 14pt; font-family: Arial; color: black;">

=

From:<=
/font>
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] Wante=
d:
Source for Ice Water Dispenser

How often d=
o you do this lab? How
about a large car-camping size ice chest. Fill it with bags of ice fr=
om
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 ye=
ar.

=

From:<=
/font>
tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of Dan Bernoulli
Sent: Saturday, February 1=
6, 2008
3:15 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Wante=
d:
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 righ=
t or
abuse is sure to follow : )

Dan Beeker

>
> -----Original Message-----
> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] O=
n
> 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] O=
n
> 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 f=
or
> 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 compan=
y
> 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] O=
n
> 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 o=
n
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 a=
fter
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
> 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!

Climb to the top of the charts!=A0Play the word sc=
ramble challenge with star power. Play now!
=

--_c95dce71-a5cb-4f91-ac52-de24c45b0cb1_--

From tap-l-owner@lists.ncsu.edu Tue Feb 26 13:29:49 2008

Back