How Much Heat Does It Take

Here's a good one. I have an idea This idea has been tossed around by me for a couple years now. It's a water storage thing. My problem is I can't figure out how many BTU"s it takes to raise the water temp of a gallon of water by ten degrees per hour. Anyone got info?

one calorie per ml to raise 1 deg c ; time will be a function of how efficient your generation and delivery system. you need Larry........ Numbers where are you?

One BTU will raise a pint one degree.
Ten BTU will raise a pint ten degrees.
There are 8 pints to a gallon so 8 times 10 =80 BTU

Larry will correct if wrong.

834 BTU's applied over a one hour period will raise 1 gallon of water by 10 degrees in one hour.

The definition of a BTU is the amount of energy required to raise 1 pound of water 1 degree F. in temperature.

8.34 lbs/gallon x 10 gallons = 83.4 lbs. of water

83.4 lbs x 10 degrees/hour = 834 BTU's/Hr.

Roughly one tenth of a pound of coal burned per hour should do it.

Scottscoaled wrote:Here's a good one. I have an idea This idea has been tossed around by me for a couple years now. It's a water storage thing. My problem is I can't figure out how many BTU"s it takes to raise the water temp of a gallon of water by ten degrees per hour. Anyone got info?

Take out the element of time -- its irrelevant - if insulated 100% the heat entered into the system would be trapped in the system .. and assume an isobaric environment and assume that 1 gr water = 1 ml

1 gal of water =/about 4 liters (actually 3.8 but lets use 4 for simplicity) ... takes 1000 cal/L degree 4 L then requires 4000 cal per degree = 40000 cal for 1 gal to be raised 10 degrees (Celsius) .

40000 cal = about 160 BTU
for 1 gal to be raised 10 C

lsayre wrote:8.34 lbs/gallon x 10 gallons = 83.4 lbs. of water

He asked for one gallon not ten. So 83 BTU.

franco b wrote:

lsayre wrote:8.34 lbs/gallon x 10 gallons = 83.4 lbs. of water

He asked for one gallon not ten. So 83 BTU.

Yes, my mistake! You are correct. I need to read my word problems more carefully. 83 to 84 BTU's it is.

Scottscoaled wrote:Here's a good one. I have an idea This idea has been tossed around by me for a couple years now. It's a water storage thing. My problem is I can't figure out how many BTU"s it takes to raise the water temp of a gallon of water by ten degrees per hour. Anyone got info?

Whatchya building?

lsayre wrote: Yes, my mistake! You are correct. I need to read my word problems more carefully. 83 to 84 BTU's it is.

Too late, he already blew his house up. All for science of course.

davidmcbeth3 wrote:

lsayre wrote: Yes, my mistake! You are correct. I need to read my word problems more carefully. 83 to 84 BTU's it is.

Too late, he already blew his house up. All for science of course.

Rats! I lose more students that way...

davidmcbeth3 wrote:40000 cal = about 160 BTU
for 1 gal to be raised 10 C

Since the question was asked in BTU which is a Fahrenheit measurement why convert to Celsius?

Small coal boiler. 20 gallon capacity. Wanted to use a small flat bed stoker. The problem is keeping the fire going. Timers are iffy. Was wondering what kind of heat would have to be dumped if I used a flat bed on it's slowest speed for idle then kicked it to it's highest for heat calls. 5 K BTU's per hour to dump. Three times per hour to keep boiler from over heating. 12 lbs coal per day to keep fire going. Not bad. Gotta revisit Stoker don's thread to see his results with a timer.

franco b wrote:

davidmcbeth3 wrote:40000 cal = about 160 BTU
for 1 gal to be raised 10 C

Since the question was asked in BTU which is a Fahrenheit measurement why convert to Celsius?

All temperature is in Celsius unless specified otherwise in my mind .... of course, I'm scientist .. so its kinda automatic .. I blame the French

C'est la vie

And my favorite,"La vie est trop courte pour boire du mauvais vin". Hahaha, That's so true!