- Here's how I do it for an actual run.

I have 2 digital thermometers mounted in compression Tees. One on the

water inlet to the condenser and one on the outlet. I then measure

water flowrate thru the condenser ( at the outlet drain) with a 2

liter pitcher and a stopwatch, measuring how much water I fill up in

30 or 60 seconds. Then apply the following formula

kW= (T2-T1)/1.8 * (V /t) * 4.18677

where T1 and T2 are in degF

V is liters

t is seconds

T2 and T1 need to calibrated against each other at the same temp, so a

correction factor can be applied to one or the other thermometer to

eliminate bias due to instrument innaccuracies.

This is the actual power, disregarding all losses. I can then use

this kW number to estimate the zero reflux rate, and then measure the

actual distillate collection rate to calculate my reflux ratio. The

theoretical numbers of this reflux ratio calculation match very

closely to real world, I have found.

Todd K.

--- In Distillers@yahoogroups.com, BOKAKOB <bokakob@y...> wrote:

> I would like to ask if someone could post a sequence of measurements

and calculation formulas for computing power in a boiler placed on a

burner. I am sure there is a formula to calculate the wattage required

to heat the given volume of water (say water) from one temperature to

another with and without losses. I would like somehow to calibrate or

at least to know the magnitude of my burner. For example, fully open

it produces 4000 watt and half closed it is 2300 watts. Are there any

mechanical or chemical engineers? Thank you in advance, Alex...

>

>

>

> Whatever I wrote above is my subjective opinion

> There are no warranties of any kind

> Act on your own risk and finally...

> I can be wrong I must say

> Cheers, Alex...

> ®

>

>

>

>

>

> ---------------------------------

> Do you Yahoo!?

> Win 1 of 4,000 free domain names from Yahoo! Enter now.

>

> [Non-text portions of this message have been removed] > I have 2 digital thermometers mounted in compression Tees. One on

the

> water inlet to the condenser and one on the outlet. I then measure

This sounds like it will give you a close approximation of the

> water flowrate thru the condenser

energy removed from the vapor and received by the condesor. There

should be all kind of losses to the condensor jacket and any other

part of the setup that you can place your hand on that feels hot.- It just occured to me that your original post was really a two part

question. One to determine the boilup parameters and the other

question being the magnitude of the burner itself.

The boilup can be calculated with and without losses from my first

post, but you can pretty accurately determine the magnitude of your

burner on your next run. Weigh the propane cylinder as acurately as

possible before and after the run and record the time spent with the

burner on a particular setting.

[Change in weight of cylinder in kg) times 12.9 KWh/kg divided by

time in hours on a particular setting.

This should give you the KW of that particular setting of your

particular burner. Would be more acurate with good scales and

averaged over a couple of runs. - I am using a regular kitchen stove. I dont use propane cylinders.

Whatever I wrote above is my subjective opinion

There are no warranties of any kind

Act on your own risk and finally...

I can be wrong I must say

Cheers, Alex...

�

---------------------------------

Do you Yahoo!?

Win 1 of 4,000 free domain names from Yahoo! Enter now.

[Non-text portions of this message have been removed] - --- In Distillers@yahoogroups.com, BOKAKOB <bokakob@y...> wrote:
> I am using a regular kitchen stove. I dont use propane cylinders.

Then you should be able to use the information from the first post

alone. Only difference between yours and mine is I use internal

elements. The losses as you know are what is going to prevent you

from arriving at say 3800 W for a 3800 W element.

If you wanted to get really close, you could also well insulate

everything and then follow through with the earlier diescription,

but also calculate the energy to heat the amount of copper and

stainless in the setup.

*****************************************************************

specific heat of stainless steel=0.5 J/g C

specific heat of copper = 0.385 J/g C

mass of copper or stainless X temperature change X specific heat =

Joules

Joules divided by 3600 = Watthour

Watthour times the duration to boilup = Watts used

******************************************************************

Everything else is heat wasted to heat your kitchen, stovetop, etc.

Of course you wouldn't use the condensor during this boilup because

that would draw out additional heat. I'm sure you realize that,

just mentioning for others that may be reading the post.