Outdoor Wood Furnace Info

All-Purpose OWF Discussions => Plumbing => Topic started by: uncle on September 25, 2013, 08:26:56 PM

Title: Pump Selection
Post by: uncle on September 25, 2013, 08:26:56 PM

Reading the previous post, I hope I got the right pump???

I have a run one way of 220' and a 30 plate heat exchanger.

What pump would you suggest?


I have a Grundos UPS15-58FC.

Brian

Title: Re: Pump Selection
Post by: Scott7m on September 25, 2013, 08:42:41 PM

To small

Title: Re: Pump Selection
Post by: RSI on September 25, 2013, 09:28:55 PM

What size pipe?

Title: Re: Pump Selection
Post by: Scott7m on September 26, 2013, 07:38:28 AM

I was assuming he had 1" pex....  Maybe he'll be back

Title: Re: Pump Selection
Post by: uncle on September 26, 2013, 01:45:43 PM

1" pex all the way.

Brian

Title: Re: Pump Selection
Post by: uncle on September 26, 2013, 08:04:02 PM

I have a second pump for my second loop, a Bell and Crossett NPF22.

That loop it 55' of 1" with only a water to air exchanger.

What do you think of this one?

Brian

Title: Re: Pump Selection
Post by: RSI on September 26, 2013, 08:16:20 PM

That one should be fine.
For the 220' run you could add another 15-58 in series or get something like a 26-99 or b&g pl36.

Title: Re: Pump Selection
Post by: uncle on September 26, 2013, 08:59:18 PM

I might keep the 15-58 for a spare/emergency pump and get the pump you quoted.
Thanks,
Brian

Title: Re: Pump Selection
Post by: uncle on November 03, 2013, 02:54:22 PM

I didn't mean to bring this back up but I need a little help.
My run to the house is 220ft one way of 1" pex. I have a 20x20 water to air hooked up. From the pump through the whole loop, there are 2 shark bite 90's total. I want to plumb in a 30 plate water to water and this will take a few more fittings.
What would be an estimate of my head and would the 26-99 still be a good pump?

I am using the 15-58 just to get heat moving but I want to do what I can to make it right.

Thanks,
Brian

Title: Re: Pump Selection
Post by: Scott7m on November 03, 2013, 02:57:40 PM

Grundfos 26-96 would be better..  I often say 26-99 but mean 26-96.

Title: Re: Pump Selection
Post by: RSI on November 03, 2013, 07:39:08 PM

What is the reason to use a 26-96 instead of a 26-99? That may be a little small for 220' each way? You can always use medium on the 26-99 it is a little big and it doesn't cost that much more..

Title: Re: Pump Selection
Post by: Scott7m on November 03, 2013, 08:07:19 PM

Quote from: RSI on November 03, 2013, 07:39:08 PM

What is the reason to use a 26-96 instead of a 26-99? That may be a little small for 220' each way? You can always use medium on the 26-99 it is a little big and it doesn't cost that much more..

Yea..  Your right, I was looking at the curves wrong

Title: Re: Pump Selection
Post by: slimjim on November 04, 2013, 04:05:58 AM

What is the heat load like, I normally try to size circs with that in mind, is the 1 inch pex inside diameter or is it nominally sized, a good rule of thumb is 1 gallon of water per minute = 10,000 btu extracted at the heat exchanger, 10 gallons per minute = 100,000 btu output, on a long run like this, sometimes it helps to double up the circs, one on each end of the line.

Title: Re: Pump Selection
Post by: uncle on November 04, 2013, 07:43:46 AM

It's just standard 1' PEX, the sharkbites work perfect.

Can we visit pump speed that you mentioned? How would I know if I needed to slow the pump or speed up the pump?

I've got the small pump on it now just to get heat moving but I have not connected the 30 plate yet.

Brian

Title: Re: Pump Selection
Post by: slimjim on November 05, 2013, 11:56:58 AM

Speed up the pump or flow rate if the differential is over 20 degrees and slow it down if under a load you are less than 10 on the differential

Title: Re: Pump Selection
Post by: uncle on November 05, 2013, 12:52:30 PM

Great, Thanks,

Brian