Quote from: tinu on January 16, 2012, 09:26:38 AM


Now that’s disturbing indeed!!!
I could not see a clear measurement of 7kg/h for the water but that’s something I can live with. If Rossi said that, so be it. However, that amount of water turned into dry steam would be over 3 liters per second and that’s a lot! Follow the calculation of steam speed for the following cases:
Hose (internal diameter)     Area (square cm)             Volume            Steam speed
1 inch (2.54cm)                        5.1cm2                         3000cm3/s       588cm/s = 21km/h       
3/4 inch (1.91cm)                     2.9cm2                         3000cm3/s       1034cm/s= 37km/h     
1/2 inch (1.27cm)                     1.3cm2                         3000cm3/s       2307cm/s= 83km/h

To me, that hose looks like a 1/2 inch one but even 21km/h (1 inch hose) is a respectable speed that should be felt/heard etc . I may be wrong and maybe I’ve made some mistakes in the above calculations.
Any thoughts?
Best regards,
Tinu

Tinu, 
7kg/hr   is 7 liters water per hour.  Steam would depend on pressure.  Not sure if you can measure steam in liters per second like you did.   However,  the pressure did look rather low coming from the hose in the video.   
I am not sure I could boil away 7 liters of water in one hour on my stove. 
 
Bill

Quote from: maw2432 on January 16, 2012, 11:09:48 AM
Tinu, 
I think you made a mistake.   7kg/hr   is 7 liters per hour  not 3 liters per second.   One Kg water  = 1 liter. 
Bill

Thanks Bill. I make many mistakes but usually  they are not that straightforward
7 l/h of water expands, when boiling, into 7 x 1600 = 11200 l/h of steam (gas) at atmospheric pressure
11200 liters of steam divided by 3600 seconds = 3.1 liters of steam per second
By some, the expansion factor is not 1600 but 1700! In any case, my figures are down-rounded.

Best regards,
Tinu

Edit after your edit: That's exactly the point: there is not enough steam coming out from Rossi's device, for a heater presumed to have 5kW thermal power. It seems much more close to a 500-1kW boiler. If you have a gas stove, you shall be able to boil that 7l/h. If your stove is electric, it's even better; although it may not have 5kW it might be relevant to check the large amount of steam at its rated power and to compare with amount seen in the movie.

Quote from: tinu on January 16, 2012, 11:20:24 AM
Thanks Bill. I make many mistakes but usually  they are not that straightforward
7 l/h of water expands, when boiling, into 7 x 1600 = 11200 l/h of steam (gas)
11200 liters of steam divided by 3600 seconds = 3.1 liters of steam per second
By some, the expansion factor is not 1600 but 1700! In any case, my figures are down-rounded.

Best regards,
Tinu

Tinu,
You caught my post before I completed my edit.   I realized after I hit the key you were talking about the amount of steam in liters.   In any case,  you have a valid point.   That is a lot of steam and I agree you should hear some of the pressure sound. 
It looks to me there is not much surface area in the e-cat.   To heat that much water to steam in one hour would require a huge amount of heat made from the e-cat.   I can not boil away 7 liters of water on my stove in a large kettle with large surface area of heat on high in that amount of time.  But that may not be a fair comparison.
Bill 

Quote from: tinu on January 16, 2012, 11:20:24 AM
Thanks Bill. I make many mistakes but usually  they are not that straightforward
7 l/h of water expands, when boiling, into 7 x 1600 = 11200 l/h of steam (gas) at atmospheric pressure
11200 liters of steam divided by 3600 seconds = 3.1 liters of steam per second
By some, the expansion factor is not 1600 but 1700! In any case, my figures are down-rounded.

Best regards,
Tinu

Edit after your edit: That's exactly the point: there is not enough steam coming out from Rossi's device, for a heater presumed to have 5kW thermal power. It seems much more close to a 500-1kW boiler. If you have a gas stove, you shall be able to boil that 7l/h. If your stove is electric, it's even better; although it may not have 5kW it might be relevant to check the large amount of steam at its rated power and to compare with amount seen in the movie.

Tinu, 
I just did a test on my electric stove.   Used large kettle on 8 inch dia. heating eliment.   Measured 1 liter water.   Brought water to full boil high heat and turned on timer for 10 minutes.   Took kettle off the stove after 10 minutes and measured 620 ml of water left.  Boiled away 380 ml water times 6 for 60 minutes is about 2.28 liters per hour.   Not sure if this means anything or not.  Larger surface area for the heat than e-cat.  Also I noticed with kettle spout open not as much steam pressure as I expected. 
Bill   

Hi Bill,

If your stove boils 2.28 l/h, it should have around 1500W:
Heat of vaporization for water is (according to Wikipedia) 2.27MJ/kg
2.27 MJ/kg * 2.28kg = 5.18 MJ = 5180kJ of energy
5180 kJ / 3600s = 1.439kW

Large surface area does not matter much. It helps a bit because it avoids condensation falling back into the kettle. But condensation only takes place as long as the walls are bellow 100 Celsius (at atmospheric pressure). If you put enough heat in the water, the kettle will quickly become hot (will reach 100 Celsius so from that point forward there will be no condensation or very little condensation) and the steam will get out anyway (or the vessel will explode, if sealed).

Anyone who has a pressure cooker or a whistle tea maker can easily check the large volume of steam generated from relatively low power. My better half usually sets the gas stove at minimum when using the pressure cooker (I estimate the power at less than 500W â€" it can be easily measured though but I didn’t bothered) but the whistle sound is quite powerful and the steam flow is also very visible, I’d say quite comparable with that seen in the above-mentioned movie.

I apologize for my divagation about steam…

Best regards,
Tinu