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damo · 06-19-13, 02:32 AM

Hello again,

in mean time I ordered some parts for controller: Arduino Mega and temp. & humidity sensors DHT22. Still looking where to get a good deal on CO2 sensors, store from ACHacker's link don't offer them anymore.

Absolutely I will take humidity and also CO2 sensor into ventilation strategy.

I also got a good deal on a EBM fans DV6424 - got 2 pcs for $45, shipping included. I excpect them to drive on low power (low voltage + low PWM) I assume they won't be too loud. Next is ordering a heat exchanger, which will be counterflow aluminium type Klingenburg GS35-300. Price is about $200 + shipping, which seems to be a good deal too. Also I am looking how to solve a bypass hatch.

Pressure sensors - I don't know exact model number yet, I guess 50mbar will be sufficient range. I prefer digital (I2C), but analog will also do.

Another idea came into my mind - how to harvest heat energy from fireplace's chimney? Chimney is an insulated stainless steel, but in upper story I have made a chamber about 40x40cm x 2.5m, and inside is uninsulated chimney. Originally I planned to ventilate this chamber and thus heat up a staircase, but it turned out that this is not necessary. Anyway this chamber is now sealed and I wonder how to transfer heat to ventilation system without mixing air. Thinking of some kind of heat pipe, but have no idea if I could transfer some serious power (1-2 kW).

06-19-13, 02:32 AM	#9
damo Lurking Renovator Join Date: Jun 2013 Location: Krsko, Slovenia Posts: 8 Thanks: 0 Thanked 1 Time in 1 Post	Hello again, in mean time I ordered some parts for controller: Arduino Mega and temp. & humidity sensors DHT22. Still looking where to get a good deal on CO2 sensors, store from ACHacker's link don't offer them anymore. Absolutely I will take humidity and also CO2 sensor into ventilation strategy. I also got a good deal on a EBM fans DV6424 - got 2 pcs for $45, shipping included. I excpect them to drive on low power (low voltage + low PWM) I assume they won't be too loud. Next is ordering a heat exchanger, which will be counterflow aluminium type Klingenburg GS35-300. Price is about $200 + shipping, which seems to be a good deal too. Also I am looking how to solve a bypass hatch. Pressure sensors - I don't know exact model number yet, I guess 50mbar will be sufficient range. I prefer digital (I2C), but analog will also do. Another idea came into my mind - how to harvest heat energy from fireplace's chimney? Chimney is an insulated stainless steel, but in upper story I have made a chamber about 40x40cm x 2.5m, and inside is uninsulated chimney. Originally I planned to ventilate this chamber and thus heat up a staircase, but it turned out that this is not necessary. Anyway this chamber is now sealed and I wonder how to transfer heat to ventilation system without mixing air. Thinking of some kind of heat pipe, but have no idea if I could transfer some serious power (1-2 kW). Last edited by damo; 06-20-13 at 03:28 AM..