home made recuperator - Page 2

damo · 06-23-13, 06:59 AM

Hx will be ordered directly from manufacturer (http://www.klingenburg.de).

Fans are EC type and their input signal is either pwm or analog voltage (which is almost the same - filtering pwm gives you analog voltage. Inside motor is variable frequency driver and motor is bdlc. I assume this frequency won't disctract my girlfriend... anyway since we have 2kids and she owns 1/2 of the house it will be easier to replace fans tha replace her

AC_Hacker · 06-23-13, 11:47 AM

Thanks for the link to the HX manufacturer. I think I will need two HRVs for my place, so I'll be needing another HX.

Quote:

Originally Posted by damo

...Inside motor is variable frequency driver and motor is bdlc...

This is very interesting, I didn't know that these fans have a variable frequency driver inside. This opens up all kinds of interesting hacking possibilities.

Can you explain what "bdlc" means?

Quote:

Originally Posted by damo

...filtering pwm gives you analog voltage...

I'd be interested to know how you go about filtering. I tried putting a large cap in parallel with the fan and the result was no variable speed. Please tell me how you are going about this.

Quote:

Originally Posted by damo

... it will be easier to replace fans than replace her...

damo, it is good to know that you are a practical man... and know how to build noise filters.

Best,

-AC

damo · 06-23-13, 01:19 PM

Ac, 'dblc' is a typo, I meant 'bldc' which stands for brushless dc motor.

These motor have 24v supply, control input (pwm or 0÷10V) and also tacho output so they are very easy to control. Inside electronic converts input signal to variable frequency signals which drive motor.Motor itself I think has 3 phase winding and is fed by var. freq. square wave from electronics. You can look for datasheet, full name of the motor is D 6424/2tdp. It is ebm papst custom made for Sun computers. There are two types 89 & 109W.

If you filter pwm you get dc voltage which varies with duty cycle. I think I will use pwm method since it is so easy on arduino.

damo · 07-07-13, 02:30 PM

Got the motors (2 for 45$

) They blow like hell..

Still looking for cheap CO2 sensors. Anyone knows where to get them for good price? Store that AC Hacker linked don't have them anymore

I plan ti implement CO sensor too.

AC_Hacker · 07-08-13, 10:38 AM

Quote:

Originally Posted by damo

...Still looking for cheap CO2 sensors...

Try ebay.

I saw some for about $50(US).

-AC

06-23-13, 06:59 AM	#11
damo Lurking Renovator Join Date: Jun 2013 Location: Krsko, Slovenia Posts: 8 Thanks: 0 Thanked 1 Time in 1 Post	Hx will be ordered directly from manufacturer (http://www.klingenburg.de). Fans are EC type and their input signal is either pwm or analog voltage (which is almost the same - filtering pwm gives you analog voltage. Inside motor is variable frequency driver and motor is bdlc. I assume this frequency won't disctract my girlfriend... anyway since we have 2kids and she owns 1/2 of the house it will be easier to replace fans tha replace her Last edited by Piwoslaw; 06-29-13 at 02:28 PM.. Reason: Inserted url

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06-23-13, 01:19 PM	#13
damo Lurking Renovator Join Date: Jun 2013 Location: Krsko, Slovenia Posts: 8 Thanks: 0 Thanked 1 Time in 1 Post	Ac, 'dblc' is a typo, I meant 'bldc' which stands for brushless dc motor. These motor have 24v supply, control input (pwm or 0÷10V) and also tacho output so they are very easy to control. Inside electronic converts input signal to variable frequency signals which drive motor.Motor itself I think has 3 phase winding and is fed by var. freq. square wave from electronics. You can look for datasheet, full name of the motor is D 6424/2tdp. It is ebm papst custom made for Sun computers. There are two types 89 & 109W. If you filter pwm you get dc voltage which varies with duty cycle. I think I will use pwm method since it is so easy on arduino.

07-07-13, 02:30 PM	#14
damo Lurking Renovator Join Date: Jun 2013 Location: Krsko, Slovenia Posts: 8 Thanks: 0 Thanked 1 Time in 1 Post	Got the motors (2 for 45$ ) They blow like hell.. Still looking for cheap CO2 sensors. Anyone knows where to get them for good price? Store that AC Hacker linked don't have them anymore I plan ti implement CO sensor too.