2007-01-04 12:40:16 · 2 answers · asked by Alex 2 in Science & Mathematics ➔ Engineering
There are two types of humidifiers: ones that have a heating element and ones that rely on evaporation.
The first kind you can get the power (measured in Watts or kilowatts) from its label.
All the other (evaporative) humidifiers absorb heat energy from the air; so you pay for this through your heating bill. (Oil is a bit cheaper than electricity, gas is a bit cheaper that oil etc.)
Each litre of water takes
1000 * 639 * 4.1868 /3600 *1000 =0.743157 KWH of energy to vaporise it from cold.
(1000 grams of water, 639 calories to vapourize a ml of 0 degree liquid water, 4.1868 Joules (Watt-seconds) per calorie, 3600 seconds in an hour, 1000 is a kilo.)
Assuming electricity costs $0.10 per KWH it costs about 7 cents per litre.
2007-01-04 15:28:10 · answer #1 · answered by J C 5 · 0⤊ 0⤋
This is usually measured in ampres (amps) as this appliance has a motor (compressor and fan) There should be a decal on the back of the appliance to tell you this. If it is a warm mist humidifier, then there will also be a heating element to factor it to the power consumption.
2007-01-04 12:47:14 · answer #2 · answered by Daremo 3 · 0⤊ 0⤋