Alternative Energy Forums

Hi,

My name is B.H.D and I discovered a device who can heat 10 litres of water from 13 C - 45 C in 30 minutes. This device work at 220v and 550W. the same device on the market use 1200w. I need a partner to develop this tehnology.

talman13

I don't think any device is more efficient than another when it comes to heating water. Reason your creating heat and inefficiency is useful: It creates more heat! The only variable should be the insulation. Sorry but read your thermodynamics.

That would also be violating the first law of thermodynamics:

DELTA_T = 32 [C]
rho = 999.4 [kg/m3]
V = 0.01 [m3]
Cp = 4185 [J/kg-C]
t = 1800 [s]

Q_dot = rho*V*Cp*DELTA_T/t = 743.5 [W]

There will be slight a variation of the water properties with temperature, but nothing that would produce a 35% difference in average power.

Electrical heating (disregarding losses) is, by definition, 100% efficient. The only way to get more power is to add some from another source. There is a way, using electrical power only, though. It's called a heat pump. It can supply up to 4 or 5 times the energy of the the electrical power put in. The energy is drawn from the air(or another medium). It's just transferred energy from one place to the other, so it doesn't violate any of the "laws". The medium loses the energy you gain.

solarcook

Dear Talman 13,

I have to agree with the above answers - getting heat from electricity is 100% efficient at the heat generating end.

I hope these answers saved you time and money trying to develop a device that would disappoint you.

Jake