BALROG Controller

Es wird an einem Forced-TLUD-Ofen gearbeitet, der hocheffizient und emissionsarm mittels eines Holzvergasungsprozesses trockene Biomasse in Wärme umwandelt. Die durch TEG-Elemente erzeugte elektrische Energie wird für aktive Belüftung und Temeraturmessung verwendet.
aron
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Registriert: So 10. Jun 2012, 03:48

Re: BALROG Controller

Beitrag von aron » Di 17. Jul 2012, 17:02

Yeah, I will post all the details when I'm back home in munich. (est. saturday)

aron
Beiträge: 251
Registriert: So 10. Jun 2012, 03:48

Re: BALROG Controller

Beitrag von aron » Di 17. Jul 2012, 17:05

But I guess a small computer fan has too bad performance for this use case.
Imagine that we want to cool a TEG element which gets very hot (200°C - 250°C on warm side - maybe we can reduce this or need to since we need to find a TEG that is heat resistent enough) and also push the cold air upwards in the secondary air flow (burn chamber, gas combustion at the top)

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shure
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Registriert: Mo 11. Jun 2012, 16:15

Re: BALROG Controller

Beitrag von shure » Di 17. Jul 2012, 19:56

I guess the average 80mm or 120mm computer fan is really enough if you don't want to melt down metal :)

200°C on the warm side should still be okay if the other side is cooled down. Anything above is starting to make trouble, as the peltier elements are usually soldered and mostly silicon semiconductors. A CPU heat sink should be fine. Maybe we can incorporate a retention module at the burning chamber and have it made modular for different heat sinks.
“With great power come great heat sinks.”

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shure
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Registriert: Mo 11. Jun 2012, 16:15

Re: BALROG Controller

Beitrag von shure » Mi 18. Jul 2012, 17:57

I ordered some parts for the controller:
-2 peltier elements 40x40mm 0-15V
-MAX31855 (Cold-Junction Compensated Thermocouple-to-Digital Converter)
“With great power come great heat sinks.”

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shure
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Registriert: Mo 11. Jun 2012, 16:15

Re: BALROG Controller

Beitrag von shure » Do 19. Jul 2012, 23:41

quick note: A 5V fan could be used more efficiently, however, most fans are 12VDC and turn very slow or don't even start at 5V. Thus we have to incorporate a dc-dc step-up controller to power the fan, at least I have only 12V fans at hand.
“With great power come great heat sinks.”

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shure
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Registriert: Mo 11. Jun 2012, 16:15

Re: BALROG Controller

Beitrag von shure » Fr 20. Jul 2012, 18:11

I now have an 80mm 12V fan running from a LM2577 step-up DC-DC swtich mode power supply with 4 NiMH cells.

Next step will be to test a TEC (Thermo-electric cooler, Peltier element) or a TEG (Thermo-electric generator), I don't have any of the latter. I will hook up some LM335 temperature sensors to a TEC element and characterize it for MPPT purposes. (MPPT = maximum power point tracking)
“With great power come great heat sinks.”

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shure
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Registriert: Mo 11. Jun 2012, 16:15

Re: BALROG Controller

Beitrag von shure » Di 24. Jul 2012, 01:41

The Maxim ICs for interfacing K-type thermocouples arrived today. I will order some standard K-type thermocouples tomorrow.
“With great power come great heat sinks.”

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shure
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Registriert: Mo 11. Jun 2012, 16:15

Re: BALROG Controller

Beitrag von shure » Do 26. Jul 2012, 01:07

Thermocouple on the way:

K Type thermocouple
Temperature range: 0-800°C
Thread diameter: 6mm
Internal insulation: Fibreglass
External shielding: Metal shield
“With great power come great heat sinks.”

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