Electric Heat Formula

The electrical load of an appliance such as a heater is the current drawn by the appliance while it is switched on.

Electric heat formula.

120 208 220 230 240 277 440 460 480. The formula for specific heat looks like this. It is also. Energy to heat water.

To heat an area like an outbuilding or new building you must calculate what size heater you need. Heat capacity is measured in j kg k. Joule s first law also known as the joule lenz law states that the power of heating generated by an electrical conductor is proportional to the product of its resistance and the square of the current. Joule heating also known as resistive resistance or ohmic heating is the process by which the passage of an electric current through a conductor produces heat.

Electric heater formulas conversion 1 kw 3413 btu load requirement kw cfm x temp. This equation is based on the criteria that there is no vaporization occurring in the heater. Once you make your calculations you can decide on the best choice for a type of heater and how many btus british thermal unit the standard heat measurement you need. When calculating the power required to heat a material flowing through a circulation heater the kw equation shown below can be applied.

However because the heat content of natural gas varies from day to day and hour to hour and fuel oil from tank to tank the temperature rise method should only be used to get the airflow close to the manufacturer s recommendation and cannot be used for ac system capacity verification. The current can be calculated. Volts x 1 73 applied vs. Sizing your heaters properly helps to ensure your home maintains a comfortable temperature regardless of fluctuations in weather.

P 5 mj 10 6 j mj 60 min 60 s min 1389 w 1 39 kw. Installing electric baseboard heating is often the easiest and most effective way to add heating to a room addition or when you are converting an unheated space such as an attic or basement ideally it s always best to extend existing ductwork from your central furnace air conditioning system but sometimes it s just not possible to route additional ductwork. How to calculate heater size. 3160 line current 1 phase amps kw x 1000.

Rated kw factors rated voltage applied voltage. How to calculate electric loads for basebord electric heaters. Volts line current 3 phase amps kw x 1000. An electric stove consumes 5 mj of energy from a 230 v power supply when turned on in 60 minutes.

The temperature rise method may be used for fossil fuel and electric furnaces. C q mδt q is the amount of supplied or subtracted heat in joules m is the mass of the sample and δt is the difference between the initial and final temperatures.