Tuesday, November 19, 2013 5:47:54 AM
The effectiveness of this solution is derived from heat exchange. Direct heating of 1 medium via another is invariably inefficient (i.e. a direct flame) but heating an intermediary is more efficient. The high temperature of the flames heats the inner pot, which being a clay pot has a very high specific heat capacity. It gets hot but far cooler than the flames of the candles. It can 'capture` and then radiate the heat very effectively. The air passing over the inner pot is warmed and convection replaces it with cooler air. This is a far more efficient way of heating a space than direct heating. If you allow high temperature gasses. I might have to give it a go.
Tuesday, November 19, 2013 2:13:26 AM
I bought one of those power-monitors and went round the house checking what every single appliance used. My netbox took 275 Watts. (50W in standby). (1600AMD, Iiyama vision master pro 454, etc). After found out that it used about 40% of my daily electricity consumption, I started switching the thing off when not in use.
Tuesday, November 19, 2013 12:13:30 AM
"You don't seem to understand the difference between a convection heater as presented and a radient heater like a candle. "
I took thermodynamics classes as part of my chemical engineering degree. Did you read what I wrote about why the pots are there? I understand it perfectly. Read the description of this video that shows the exact same thing:
The other people wrote it a little more clumsily than I did, in my opinion. This part "as opposed to just relying on heat produced by the candles." sounded like heat creation the first time I read it, that`s all.
Monday, November 18, 2013 10:36:12 PM
A candle puts out ~50 W of heat x 4 = ~200 W. Putting flower pots around them doesn't make them produce any more heat; however, it does convert much of it into radiant infrared energy as opposed to hot gas shooting up to the ceiling. It`s effectiveness would depend on the size of the room, the outside temperature, and insulation.
For comparison, a typical electric heater puts out 1500 W (~30 candles) and costs $0.18/hr. to run at full power, based on a rate of $0.12/kWh. If you cut it back to 200 W, that works out to $0.025/hr or ~1.5p/hr, which would be ~12p to run it for 8 hrs.
Candles, therefore, will heat for about half the cost of electricity. However, electricity is the most expensive heat source you can get. It`s ~3.4 times more than natural gas which will generate 200 W of heat for 8 hours for $.035 or ~2.2p.
So, candles are cheaper than electricity but more expensive than gas. Plus, you don`t have to drive to Ikea for gas.