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★ Capacity Calculation
★ Air heating calculation
★ Water heating calculation
★ Calculation of the heater
★ Three-phase star connection
★ Three-phase triangle calculation

★ Heat calculation: Capacity Calculation

Enter a numerical value or calculation formula, 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 capacity of E [W] is required.

Volume 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 capacity of D [W] is required.

★ Heat calculation: air heating capacity calculation

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

Enter a numerical value or formula, and then click [Calculate].

The volume 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 capacity - 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 capacity of G [W] is required.

Capacity 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] capacity 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 a numerical value or formula, and then click [Calculate].

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

Value at 1atm (1013.3hPa). Water is between 0 ° C and 100 ° C, ice below, and steam above.

It can be calculated from -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] capacity 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

You can calculate from 0 °C to 100 °C.

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 capacity of E [W] is required, of which F% is the heat dissipation loss. is.

The heat loss depends on the heating conditions, so use this calculation as a guide.


Conditions for simple calculation

  • Room temperature is the same as temperature B before heating, there is no wind.

  • The container is made of metal and is full of water. Container top is in contact with the air.

  • Cover with insulation.

  • Insulation thickness 50mm.

★ About heater: Heater calculation

Enter two numerical values on the input line, and then click [Calculate].

Single phase heater

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

In an actual heater, there is a temperature coefficient of resistance, so R during cold is smaller than this.

Three phase heater

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

In an actual heater, there is a temperature coefficient of resistance, so R during cold is smaller than this.

★ About heater: Calculation of three-phase star connection

Enter the power supply voltage and each resistance value, calculate the line current and power.

Enter a numerical value or formula, and then click [Calculate].

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

After inputting the power supply voltage and each resistance value, the phase current, line current and power are calculated.

Enter a numerical value or formula, and then click [Calculate].

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:
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
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