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*Note:
1. This calculation tool is for reference only. Please verify the results and make necessary adjustments.
2. The user takes responsibility for any issues or damages from using the tool.
★ Power calculation
★ Air heating calculation
★ Water heating calculation
★ Ohms law calculation
★ Three-phase star connection
★ Three-phase triangle calculation

★ Heat calculation: Power calculation

Enter the values and then click [Calculate]

Capacity required to raise the temperature of the object

Mass of object to be heated - A: kg
Specific heat of the object to be heated - B: J/kg ℃  
Required temperature rise - C: ℃  
Temperature rise time - D: Hour  
Required capacity - E: W

To raise the temperature of an object A [kg] with a specific heat B [J/kg °C] by C [°C] in D [hours], a Power of E [W] is required.

Power required for melting or evaporating the object

Mass of object to be heated - A: kg
Heat of melting or evaporation of the
object to be heated - B:		 kJ/kg  
Time to melt or evaporate - C: Hour  
Required capacity - D: W

In order to melt or evaporate an object A [kg] with heat of fusion or heat of evaporation B [kJ/kg] in C [time], a Power of D [W] is required.

★ Heat calculation: air heating power calculation

Value at 1atm (1013.3hPa). It can be calculated from -100 ℃ to 1600 ℃.

Enter the values and then click [Calculate]

The Power required to raise the temperature of a volume of air

Volume of air to be heated - A: m3
Temperature before heating - B: ℃
Temperature after heating - C: ℃
Temperature rise time - D: Hour
Air mass - E: kg
Air volume after heating - F: m3 
Required Power - G: W

In order to raise the temperature of air with volume A [m3] and temperature B [°C] to C [°C] in D [hours], a Power of G [W] is required.

Power required to raise the temperature of a certain mass of air

Mass of air to be heated - A: kg
Temperature before heating - B: ℃
Temperature after heating - C: ℃
Temperature rise time - D: Hour
Air volume before heating - E: m3
Air volume after heating - F: m3
Required capacity - G: W

G [W] Power is required to raise the temperature of air with mass A [kg] and temperature B [°C] to C [°C] in D [hours].

★ Heat calculation: Water heating capacity calculation

Enter the values and then click [Calculate]

Power required to raise the temperature of a certain mass of water (ice / steam)

Value at 1atm (1013.3hPa). Water temp: 0℃~100℃ / Ice temp: ≤0℃ / Steam temp: ≥100℃。

Calculated range: -200℃ to 300℃

Mass of water to be heated - A: kg
Temperature before heating - B: ℃
Temperature after heating - C: ℃
Temperature rise time - D: Hour
Before heating:
After heating:
Required capacity - E: W

Water (ice / steam) with mass A [kg] and temperature B [°C] is converted to C [°C] in D [hours].

To raise the temperature, E [W] Power is required.

Ice → water has “heat of melting (334kJ / kg)”

For water → steam, “heat of evaporation (2257kJ / kg)” is required.

Simple calculation including heat dissipation loss when heating water in a container

Calculated range: 0℃ to 100℃

Container lid: No  Yes
Container insulation: No  Yes
Mass of water to be heated - A: kg
Temperature before heating - B: ℃
Temperature after heating - C: ℃
Temperature rise time - D: Hour
Required capacity - E: W
Heat dissipation loss - F: %
Heat dissipation at water temperature C - G: W

In order to raise the temperature of water with mass A [kg] and temperature B [° C] to C [° C] in D [hours], a Power of E [W] is required, of which F% is the heat dissipation loss.

The heat loss depends on the heating conditions, the results should be used for reference purposes only.


Conditions for simple calculation

  • The room temperature remains constant before heating, and the effects of wind are neglected.

  • The container is a metal cubic one with its top exposed to air.

  • The container is covered with insulation material.

  • The thickness of the insulation material is 50mm.

★ About heater: Ohms law calculation

Enter two values and click [Calculate] to determince the other two

Single phase heater

Voltage E Current I Resistance R Electric power W
V A Ω W
Calculation result: V A Ω W

The resistance temperature coefficient varies with temperature during the heating process.

At lower temperatures, the resistance (R) is smaller.

Three phase heater

Voltage E Current I Resistance R Electric power W
V A Ω W
Calculation result: V A Ω W

The resistance temperature coefficient varies with temperature during the heating process.

At lower temperatures, the resistance (R) is smaller.

★ About heater: Calculation of three-phase star connection

Enter the power supply voltage and the resistance of each load, click [Calculate] to calculate current, power, and total power.

Power-supply voltage E: V
Resistance value Ra: Ω
Resistance value Rb: Ω
Resistance value Rc: Ω
Current Ia: A
Current Ib: A
Current Ic: A
Ra power: W
Ra power: W
Ra power: W
Total power W: W

★ About heater: Calculation of three-phase delta connection

Enter the power supply voltage and the resistance of each load, click [Calculate] to calculate current, power, and total power.

Power-supply voltage - E: V
Resistance value - Ra: Ω
Resistance value - Rb: Ω
Resistance value - Rc: Ω 
Phase current - Iba: A
Phase current - Icb: A
Phase current - Iac: A
Current - Ia: A
Current - Ib: A
Current - Ic: A
Power - Ra: W
Power - Rb: W
Power - Rc: W
Total power - W: W
Power-supply voltage - E: V
Power - Ra: W
Power - Rb: W
Power - Rc: W 
Resistance value - Ra: Ω
Resistance value - Rb: Ω
Resistance value - Rc: Ω
Phase current - Iba: A
Phase current - Icb: A
Phase current - Iac: A
Current - Ia: A
Current - Ib: A
Current - Ic: A
a-b resistance: Ω
b-c resistance: Ω
a-c resistance: Ω
As a professional electric heater manufacturer, Reheatek is commited to the production of high-quality cartridge heater, tubuler heater, immersion heater and temperature sensor.

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