Pipe and pump sizing

Ross_9

First I want to thank all of you for all the great info I got the ideas of the primary loop from this forum and I think I will use that method
Unless it gets a bunch of holes shot in it.

I bought an AHS wood gun (150000 BTU) it has 1 1/2 supply and return on the boiler it will be about 50 feet from my house in a small building piped to my weil Mclain oil boiler that has 1 1/4 supply and return but is bushed down to 1 inch after the first drop I am pretty sure that I will have 1" hePex to and from the boiler

Is that big enough?

Would a taco 0010 f be big enough?

Do you see any problems with the piping?

How would you set up the circulators?(oil circ whenever there is a call for heat,wood when it is hot enough)?

How would I protect the wood boiler from a cold return(mixing, setpoint,Zone,valve) I want to stop the wood circ if it is too cold so the oil boiler will fire if there is a call for heat and not warm enough, I think that the circ on the wood is set to come on at 160 but nothing to stop the return of REALLY cold water.

What is the software that does such a nice job of piping diagrams?

Ross_9

anybody?

I thought that I could at least get some criticism on my great ideas.
Sorry, hard to be patient.
Really chomping at the bit to get started o this project.

dhghm

if i understand the pex will be underground - i have worked on similar systems your big problem is the piping in the ground heat loss.there are many ways to insulate but very few that last the movement /moisture and abuse of backfilling.check out ecoflex pipinp an insulated pex that is ideal for this application

Terry

Similar

I've done similar systems, What I've done is;

Run open system wood boiler to Heat Exchanger in House.
(size heat exchanger for proper temp drops and you shouldn't be shocking your boiler)

the other side of the heat exchanger is the closed loop heating zones.

And dont forget to add in BTU pipe loss for trenched lines.
Even the highly insulated Eccoflex lines loose about 17-20btu per ft.

EIN

hr

I feel the best

piping is to build a primary loop that both boilers feed and the loads take off from. Then either/ or boiler can feed the loop.

As I see your drawing the hot wood boiler will circulate through an unfired oil boiler?

If so the unfired boiler will shed btus sent from the wood.

There are a lot of ways to pipe and interface these systems. Here are 3 good, better, best options.

Is the "gun" an open system? Then a HX is needed.

I like to see a buffer tank, as it can be hard to fire a wood boiler exactly to the load. Especially true when owners jam them full and leave for the day.

Yes a return protection "device" is a good idea for the boiler. Really important with gasification units to keep them burning hot, hot, and at peak efficiency.

This can be a simple 3 way thermostatic, or a VS pump.

If you can get a copy of Siggy's Seminar Manual from this summers tours, there are about a dozen pages on wood boiler interface options.

I think PM mag sells this manual, or contact Siggy at www.hydronicpros.com

hot rod

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Ross_9

OK but and thanks so far

is the taco 0010 pump too big?

Can I just put 1 1/2 to the 1 inch pex but tee out and back to the return with a ball valve to mix hot water?The circ turns on at 160. What are the problems with this?
How big of pipe should be on the primary loop?
What determines the pump and pipe size?