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Author Topic: solar air heater flow rate  (Read 315 times)
billi
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« on: October 28, 2018, 03:25:38 PM »

Hi there

Am having a fan running to push warm air from a conservatory    as a temporarry  setup , but cannot find the airflow  specs for that model , its about 8" propeller diam and says about  20 watt ...., does the tric  ... and heats the whole house today  at temps outside about 5  degrees

Would like to take one glass panel out of the window and fit  a fan idea with a termostat , found these  and they would fit  (2 of them )  if they deliver what is described it sounds the job 200 m3 per hour then ..... what do you think  ,  would the airflow of the temporarry one be much higher ?
https://www.technikcoach.de/en/silent-belueftungseinheit-fuer-ut-rack-und-rfa?fbclid=IwAR1V7VIlO_c4Jk85857LqDgvDADXA5uJ5tuXSjeeM4ECP9YEErjGSMlQDmE

fan details here

https://www.blacknoise.com/site/en/products/noiseblocker-it-fans/nb-blacksilentfan-series/120x120x25mm.php


* fan.jpg (350.21 KB, 984x738 - viewed 103 times.)
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1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
rogeriko
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« Reply #1 on: October 28, 2018, 04:49:49 PM »

Those are just computer fans. Go to any computer repair shop and they will give you a bunch for free, then you can try them. They will not move as much air as the big one.
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knighty
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« Reply #2 on: October 28, 2018, 07:00:36 PM »

just check how many watts the motors are... for a fan watts = air moved

you big one is 18watts, those little ones are 1.8watts

what size do you need?
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billi
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« Reply #3 on: October 28, 2018, 07:16:36 PM »

..... not as easy  i am afraid ,  some  bathroom vents have lot more watt but much lesser air flow than some computer fans , but i think they have to  move air through longer pipes .... so might  need more pressure to overcome

Hmm ...... but if i have a look at the  established air collectors  than the big one of those with 6m2  collector area has about 250 m3 airflow ..... but i guess here as well  air has to be pushed through pipe lenght

 so i guess i  try to find something  with at least 200 m3  as  the greenhouse  should create   more heat  with about  25 m2 glass roof and wall


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1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
skyewright
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« Reply #4 on: October 29, 2018, 10:31:28 AM »

Any chance of allowing (controllable) high & low (height)  vents between the house & conservatory, then just letting convection do it's thing to transfer & mix the air?
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David
3.91kWp PV  (17 x Moser Baer 230 and Aurora PVI-3.6-OUTD-S-UK), slope 40, WSW, Lat 57 9' (Isle of Skye)
MeatyFool
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« Reply #5 on: October 29, 2018, 01:32:40 PM »

This!

https://en.wikipedia.org/wiki/Trombe_wall

Meatyfool..
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billi
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« Reply #6 on: October 29, 2018, 01:55:00 PM »

A Fan is  needed to push the warm air fast into the rooms , without the fan and the window to the room open , the greenhouse heats up a lot  and cause the fan is  having a thermostat it will decide itself when to start and stop , so one has not to worry too much of heatloss  back into the greenhouse , cause window is closed then and the fan inbuilt into the window  gets a flap

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1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
skyewright
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« Reply #7 on: October 29, 2018, 02:06:10 PM »

A Fan is  needed to push the warm air fast into the rooms , without the fan and the window to the room open , the greenhouse heats up a lot  and cause the fan is  having a thermostat it will decide itself when to start and stop , so one has not to worry too much of heatloss  back into the greenhouse , cause window is closed then and the fan inbuilt into the window  gets a flap

Even with a fan (at high level), a low level return flap to let colder house air into the greenhouse would help improve circulation (& make life easier for the fan, so it could work more efficiently?).

Edit to add:

PS. I just noticed that it was 24-25C in our conservatory, so I've opened the door & windows between here & there, and internal doors. I'll close when it gets down to 21-22C. For us at least 2-3 degrees difference seems adequate to encourage pretty effective heat distribution into the house. I can see the temps from my computer if I wish, but once you've been doing it for a few years you can get a reasonable idea from just being 'aware'. One of the joys of working from home...  Smiley
« Last Edit: October 29, 2018, 02:14:36 PM by skyewright » Logged

Regards
David
3.91kWp PV  (17 x Moser Baer 230 and Aurora PVI-3.6-OUTD-S-UK), slope 40, WSW, Lat 57 9' (Isle of Skye)
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