Heat bed Study for Scalar XL – Test 5

image_pdfimage_print

In this solution, we are studying the use of a single Aluminum plate 435x320mm, 3mm thick) with addition to a foil insulation sheet, used in test 2 that seem.

The Setup

We can see here the insulator below the aluminum plate.

Setup Details:

  • Heat beds: 2
  • Bed 1: MK1a (with the thermistor) powered by PSU N°1 (360W)
  • Bed 2: MK2B powered by PSU N°2 (300W)
  • Initial Temperature: 24°C
  • Target Temperature: 110°C
  • Print Surface: 1x 3mm aluminum plate (435x320mm)
  • Insulator: 2mm insulator sheet

Temperature profiles:

The red curve is the heating profile, when we apply the 110°C target.
The blue curve is the cooling profile, when the target temperature is set to 0°C.Here the power supplies are OFF.

At the bottom of each graph you have the time in seconds

On the left of the graphs you have the temperature in °C

 

Conclusion

While heating we have:

  • 60°C in 3 min 07 (187 sec)
  • 100°C in 23 min 01s (1381 sec)

The system can barely reach 100°C and 102°C seems to be the maximum!

And we need to wait 6 min 35 sec (395 sec) to cool down from 100°C to 60°C

Comparison with the previous test:

Compared with test 4 it seems a little bit better :

  • The heating time to reach 60°C has decrease by 42%
  • The heating to to reach 100°C Max has decreased by 30%.

We have a gain in heating time between 30% and 40% by simply changing the insulator below the aluminum plate. This foil insulator is more performant than the cork sheet for this kind of application.

Regarding the cooling time we get the same results as previous test..

Here we see that the foil insulator is radiating the infrared radiation toward the aluminum plate, increasing the performance between 30% to 40%.

Comparison with the Initial test:

  • We decrease by 7% the heating time to reach 60°C.
  • We increase by 41% the heating time to reach 100°C
  • The print surface is Increased by 74%.
  • In this system the max temperature seems to be limited to 100°C Max!
  • However, even by increasing the heating surface by 74% the time delta to reach 100°C is only 41%.