Page 1536 - MISUMI SINGAPORE Economy Series

Economy series Selection Method
Cartridge Heaters

Q Heater Selection

· Determine the required heater heat (W)
It can be calculated with the following formula according to the mass, specific heat, rising temperature, and the heating time required to reach
the set temperature of the heated object.
Mass of the heated object (kg) × Specific heat of the heated object (kcal/kg°C) × rising temperature of the heated object (°C)
Required Heater Heat (kW)=
860 × Heating Time (h) × Efficiency (j)
The efficiency varies with heat preservation, thermal insulation, heater settings, etc, so it is difficult to calculate correctly, but generally 0.2 to
0.5 is appropriate.
Specific Gravity·Specific Heat of Main Materials Example: if you want to make 200×100×50(mm) stainless steel block heater with a
Specific Gravity Specific Heat mass of about 8kg heated to 180°C.
Material (g/cm ) (kcal/kg°C) The heating time of a block heater from 20°C to the set temperature is set to 30 minutes.
3
Aluminum
(A7075P Category) 2.80 0.230 Required Heater Heat (kW)= 8×0.11×(180-20) =1.1(kW)
Steel 7.85 0.113 860×0.5×0.3 =1100(W)
Stainless Steel 7.82 0.110
Brass 8.70 0.100 * For standard specifications, the efficiency is set to 0.3. Please refer to the following chart for the
measured data of temperature rise time classified by power.
22 · Determine the number of heaters and the heat of each heater (W).
The number of heaters is determined according to the size of the heated object, and the total heat (W) is the heat required by the heated object.
Heaters / Temperature Sensors / Heat Insulating Plates Q Cartridge Heater Selection
Example: Use 2 heaters of 550(W) (1100W in total).

1 Determine the diameter of the heater

3 Determine the heat required by the heated object(W)
Cartridge Heaters 2 Determine the length of the heater
Q Measured data of temperature rise time classified by power

P.1529 500
Temperature Sensors 400 Power 78W
450
Power Density 5W/cm 2

Power Density 7.5W/cm 2
P.1537 350 Power 118W
300
Temperature Controllers Temperature (°C) 250 Power 157W
Power Density 10W/cm 2
200
Power Density 12.5W/cm 2
P.1551 150 Power 196W
100
Heat Insulation Plates 50 Power 235W
Power Density 15W/cm 2

P.1555 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (minutes)
* Heater Used: Diameter φ10, Length 65mm (Heating Part 50mm)
* Heated Object: Aluminum (60×50×20)
* The temperature is the central surface temperature of aluminum.
Q Temperature Control Temperature Sensors
· Although the position of the temperature sensor should
be determined according to the setting conditions of the
heated object (metal block), it is recommended to set it
as close to the heater as possible, in order to prevent
the heater from overheating.
10mm
* Normally, the distance between the heater and the temperature sensor is about 10mm. Cartridge Heaters Metal Block
1531