Outdoor Wood Furnace Info

All-Purpose OWF Discussions => General Outdoor Furnace Discussion => Topic started by: yotehunter66 on January 12, 2015, 04:17:01 PM

Title: Air velocity from furnace
Post by: yotehunter66 on January 12, 2015, 04:17:01 PM: Anyone measure their air velocity after they installed their ac coil and then their water to air exchanger? I'm curious to see what kind of restrictions they may be getting after they install these and what their cfm on the furnace blower is.
Title: Re: Air velocity from furnace
Post by: Bud Man on January 12, 2015, 05:59:50 PM: I haven't measured airflow but, it is much lower than before I put in the water to air exchanger. I'm getting by but something needs to be changed before next year. Maybe a higher capacity fan.
Title: Re: Air velocity from furnace
Post by: mlappin on January 12, 2015, 07:36:24 PM: Quote from: Bud Man on January 12, 2015, 05:59:50 PM
I haven't measured airflow but, it is much lower than before I put in the water to air exchanger. I'm getting by but something needs to be changed before next year. Maybe a higher capacity fan.

Have you tried changing speeds on the fan? The faster the air moves the cooler it will feel.
Title: Re: Air velocity from furnace
Post by: yotehunter66 on January 13, 2015, 04:37:47 PM: This is true but with to little air movement it will take longer to bring the house up to temp or evenly. You original furnace design was with a specific air flow to deliver the btus it makes. I did change the speed on my fan and it made a noticeable difference.
Title: Re: Air velocity from furnace
Post by: dukethebeagle on January 13, 2015, 06:57:50 PM: o.k ,so do u think more fan speed with a little cooler air is better
then hotter air at the slower speed.i have also wondered about this
i put mine on low speed but it is true it takes a while to warm the place up enough
to kick the thermostat off
hmmmmmm
Title: Re: Air velocity from furnace
Post by: cando attitude on January 13, 2015, 07:09:38 PM: Duke, I personally prefer the slower fan speed and hotter temperatures. I have and exercise the ability to leave the fan on continuously (low, medium and high speeds). I leave mine on low which delivers ~400 cfm continuously to the entire house. I find that this makes for a much more uniform temperature in the house, especially as I am heating 2 levels.

I have performed some experiments with an IR gun, measuring air temperature coming from the register vents to better understand the effects of airflow.

Cando
Title: Re: Air velocity from furnace
Post by: yotehunter66 on January 14, 2015, 06:06:38 PM: I think your going to have to experiment with your own situation. In my case my furnace fan would run way to long before shutting down. Part of this could be where my thermostat is located. It is in the hallway where the are no vents of any kind. I see no noticble increase is wood usage.