The thermal efficiency of the electric water heater is eighty percent, and the thermal efficiency of the air energy water heater is four hundred percent,Now the water of 100kg is heated from 15 to 55 degrees centigrade. What are the power consumption of electric water heaters and air energy water heaters with 1400W power? How much time are they used?
Electric water heater efficiency is 80% 4.67/80% ~ 5.84 kwh of electricity consumptionThe efficiency of an air heater is 400% and consumes 4.67/400%=1.1675 degrees of electricity
The heat produced by 1 degrees of electricity is 3600000 joules16800000/3600000 is about 4.67 kwh electricity consuming
1kg water rising once requires 4200 joules of heat100kg water rises 40 degrees (55 =16800000 -15) and consumes 40*100*4200 joules of Joule
