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Prechiller for ice machine amdx 02-29-2008
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Posted by amdx on February 29, 2008, 3:17 pm
I have an ice machine that produces about 450 lbs per 24 hrs.
In the winter!
I live in Florida, in the summer the inlet water temperature can be close
to 90*.
I want to prechill the water to maybe 40*. The machine will need about 1
gallon every 15 minutes.
I'd like to use a small refrigerator to chill the water.
I have a few details to work out, such as it takes 252 ft of 5/16"
tubing to hold 1 gallon of water. (not practical)
The refrigerator I'm looking at says 256 btu/hr.
My question, how many btu does it take to reduce the temperature
of 1 gallon of water from 90* to 40* in 15 minutes.
Thanks, Mike



Posted by on February 29, 2008, 4:03 pm

> I have an ice machine that produces about 450 lbs per 24 hrs.
> In the winter!
> I live in Florida, in the summer the inlet water temperature can be close
>to 90*.
> I want to prechill the water to maybe 40*. The machine will need about 1
>gallon every 15 minutes.
> I'd like to use a small refrigerator to chill the water.
> I have a few details to work out, such as it takes 252 ft of 5/16"
>tubing to hold 1 gallon of water. (not practical)
> The refrigerator I'm looking at says 256 btu/hr.
>My question, how many btu does it take to reduce the temperature
>of 1 gallon of water from 90* to 40* in 15 minutes.
> Thanks, Mike
>

1 degree per pound.

90 - 40 = 50

50 * 8.8 = 440 BTU

440 BTU in 15 minutes = 1760 BTUH

IOW - ~ 7 of your refrigerators :-)


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Posted by amdx on February 29, 2008, 6:33 pm

>
>> I have an ice machine that produces about 450 lbs per 24 hrs.
>> In the winter!
>> I live in Florida, in the summer the inlet water temperature can be close
>>to 90*.
>> I want to prechill the water to maybe 40*. The machine will need about 1
>>gallon every 15 minutes.
>> I'd like to use a small refrigerator to chill the water.
>> I have a few details to work out, such as it takes 252 ft of 5/16"
>>tubing to hold 1 gallon of water. (not practical)
>> The refrigerator I'm looking at says 256 btu/hr.
>>My question, how many btu does it take to reduce the temperature
>>of 1 gallon of water from 90* to 40* in 15 minutes.
>> Thanks, Mike
>>
>
> 1 degree per pound.
>
> 90 - 40 = 50
>
> 50 * 8.8 = 440 BTU
>
> 440 BTU in 15 minutes = 1760 BTUH
>
> IOW - ~ 7 of your refrigerators :-)
>
It's always something!

Ok, please explain it to me,
You said "1 degree per pound"
Is that 1 BTU = 1 degree change in 1 pound of water?
Also water weighs 8 lbs per gallon
50degrees * 8 lbs of water = 400 BTU
400 in 15 minutes = 1600 BTUH
That's only 6 1/4 refrigerators. :-)
Alright, just trying to be funny, did I understand
the proccess?
I've been thinking about doing this for a couple of years,
now I see why I've just been thinking!

Thank You, Mike


> --
> Click here every day to feed an animal that needs you today !!!
> http://www.theanimalrescuesite.com/
>
> Paul ( pjm @ pobox . com ) - remove spaces to email me
> 'Some days, it's just not worth chewing through the restraints.'
> 'With sufficient thrust, pigs fly just fine.'
> HVAC/R program for Palm PDA's
> Free demo now available online http://pmilligan.net/palm/



Posted by on February 29, 2008, 6:51 pm

>
>>
>>> I have an ice machine that produces about 450 lbs per 24 hrs.
>>> In the winter!
>>> I live in Florida, in the summer the inlet water temperature can be close
>>>to 90*.
>>> I want to prechill the water to maybe 40*. The machine will need about 1
>>>gallon every 15 minutes.
>>> I'd like to use a small refrigerator to chill the water.
>>> I have a few details to work out, such as it takes 252 ft of 5/16"
>>>tubing to hold 1 gallon of water. (not practical)
>>> The refrigerator I'm looking at says 256 btu/hr.
>>>My question, how many btu does it take to reduce the temperature
>>>of 1 gallon of water from 90* to 40* in 15 minutes.
>>> Thanks, Mike
>>>
>>
>> 1 degree per pound.
>>
>> 90 - 40 = 50
>>
>> 50 * 8.8 = 440 BTU
>>
>> 440 BTU in 15 minutes = 1760 BTUH
>>
>> IOW - ~ 7 of your refrigerators :-)
>>
> It's always something!
>
>Ok, please explain it to me,
> You said "1 degree per pound"
> Is that 1 BTU = 1 degree change in 1 pound of water?

        Yes. Do it in one hour, that's 1 BTUH. To do it in 15
minutes, that's 4 BTUH ( for less than an hour )

> Also water weighs 8 lbs per gallon

        My bad. 8.34

"A US gallon of fresh water at 4 degrees C weighs 8.34 pounds. An
imperial gallon at 62deg F (old UK system) weighs 10 pounds. "


>50degrees * 8 lbs of water = 400 BTU
>400 in 15 minutes = 1600 BTUH
>That's only 6 1/4 refrigerators. :-)

        See, you're making progress already !

>Alright, just trying to be funny, did I understand
>the proccess?

        Yep.

> I've been thinking about doing this for a couple of years,
>now I see why I've just been thinking!

        I tried it once - didn't care for it.


--
Click here every day to feed an animal that needs you today !!!
http://www.theanimalrescuesite.com/

Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
'With sufficient thrust, pigs fly just fine.'
HVAC/R program for Palm PDA's
Free demo now available online http://pmilligan.net/palm/

Posted by amdx on March 1, 2008, 7:00 am

>
>>
>>>
>>>> I have an ice machine that produces about 450 lbs per 24 hrs.
>>>> In the winter!
>>>> I live in Florida, in the summer the inlet water temperature can be
>>>> close
>>>>to 90*.
>>>> I want to prechill the water to maybe 40*. The machine will need about
>>>> 1
>>>>gallon every 15 minutes.
>>>> I'd like to use a small refrigerator to chill the water.
>>>> I have a few details to work out, such as it takes 252 ft of 5/16"
>>>>tubing to hold 1 gallon of water. (not practical)
>>>> The refrigerator I'm looking at says 256 btu/hr.
>>>>My question, how many btu does it take to reduce the temperature
>>>>of 1 gallon of water from 90* to 40* in 15 minutes.
>>>> Thanks, Mike
>>>>
>>>
>>> 1 degree per pound.
>>>
>>> 90 - 40 = 50
>>>
>>> 50 * 8.8 = 440 BTU
>>>
>>> 440 BTU in 15 minutes = 1760 BTUH
>>>
>>> IOW - ~ 7 of your refrigerators :-)
>>>
>> It's always something!
>>
>>Ok, please explain it to me,
>> You said "1 degree per pound"
>> Is that 1 BTU = 1 degree change in 1 pound of water?
>
> Yes. Do it in one hour, that's 1 BTUH. To do it in 15
> minutes, that's 4 BTUH ( for less than an hour )
>
>> Also water weighs 8 lbs per gallon
>
> My bad. 8.34
>
> "A US gallon of fresh water at 4 degrees C weighs 8.34 pounds. An
> imperial gallon at 62deg F (old UK system) weighs 10 pounds. "
>
>
>>50degrees * 8 lbs of water = 400 BTU
>>400 in 15 minutes = 1600 BTUH
>>That's only 6 1/4 refrigerators. :-)
>
> See, you're making progress already !
>
>>Alright, just trying to be funny, did I understand
>>the proccess?
>
> Yep.
>
>> I've been thinking about doing this for a couple of years,
>>now I see why I've just been thinking!
>
> I tried it once - didn't care for it.
>
Our ice machine produces what we need 48 or 49 weeks per year.
If I could just get a little more out of it when its so hot I would not have
to concern myself with purchasing, transporting and storing ice
those few weeks a year.
Still hopeful,
Mike



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