Does it matter if a circ pump is pulling from a tank or pushing to a tank. Plumbing in my circ. pump from primary tank to storage tank.
Thanx. Huff.
Thanx. Huff.
circ. pump question
- Thread starter huffdawg
- Start date
-
Active since 1995, Hearth.com is THE place on the internet for free information and advice about wood stoves, pellet stoves and other energy saving equipment.
We strive to provide opinions, articles, discussions and history related to Hearth Products and in a more general sense, energy issues.
We promote the EFFICIENT, RESPONSIBLE, CLEAN and SAFE use of all fuels, whether renewable or fossil.
- Status
Hunderliggur
Minister of Fire
Assuming you have a closed system, no there is not significant difference. What is a primary tank in relation to a storage tank?
infinitymike
Minister of Fire
I'm not a plumber but I've heard it said that they can wear out sooner because of the hot water flowing through them. With that said I am in the process of hooking up my wood gun and will be putting a circ on the top of the unit to push/supply hotwater 70 feet to my primary loop and back to the boiler. I'll let you know when I goes bad. 
I used to be a Bruins fan before 1970 ,my dad was a bruins fan too. Than we had to jump ship when we got our own team here.NovaScotian said:
Sure hurt when Neely got traded to Boston.
Nice! It common to see the circ pumping into the boiler with restrictive heat exchangers type boilers, like many of the mod con types. This way the boiler HX sees the pressure increase the pump provides and helps keep them from flashing.
In your case with "wide open" boiler passageways it would not matter. Cooler is always better for a motor, so on the return you would be in a cooler flow, the pumps are typically rated to 225F operating max.
Add a float type air vent on top of your buffer tank, in that ball valve. That is a great place to slow the flow and capture air in that domed up section.
Calculate the entire water volume to size an expansion tank, that one looks a tad small?.
hr
In your case with "wide open" boiler passageways it would not matter. Cooler is always better for a motor, so on the return you would be in a cooler flow, the pumps are typically rated to 225F operating max.
Add a float type air vent on top of your buffer tank, in that ball valve. That is a great place to slow the flow and capture air in that domed up section.
Calculate the entire water volume to size an expansion tank, that one looks a tad small?.
hr
in hot water said:
Thanx you gave me the idea a while back. I ripped out my primary loop with closely spaced tees that I installed. Then I replaced it with that buffer tank. I have an extrol 60 gal. exp. tank that I will replace that small one with tommorrow.
What would be the the best way to pipe the storage tank in . Top of primary tank to top of storage, bottom of storage to bottom of primary? with the circ pump pulling from the bottom of storage.
Huff
huffdawg said:
Very nice! I could use something like that in My shed. What are your plans for ducting and fan?
gg
Gasifier
Minister of Fire
ewdudley
Minister of Fire
I can see how hot water gets from boiler to primary tank, but how does hot water get from boiler (or primary tank) to storage? How does hot water get from storage to primary tank? Are you going to use two pumps from primary tank to storage, one going one way and one going the other? How would you control that?huffdawg said:
DaveBP said:
Yes with my house loads about 50' away I thought it woud be easier to be able to run my shop loads while replumbing my house loads. Instead of having one big primary loop that went all the way to the house that all loads tee'd off of ,I can now Isolate the loop going to the house from the primary tank.
I hope that makes sense.
Cheers Huff
Flow reversal can be done a couple ways. On mine I have two pumps facing each other. But remember the internal checks need to be removed I'm not that pleased with the operation it tends to thermosiphon when the checks are left out.
I will try a 4 way valve with a motor that drives it from one extreme to the other. I had a sample of this valve a few years back to correct a radiant job that had a 1000' loop installed! The valve would flow into the loop from one end for 30 minutes, then flow from them other for 30 minutes. It actually did help the floor temperature even out by flip flopping the flow.
The valve was built up by Leif at Paxton. Basically it had a Honeywell 24V actuator motor bolted on. I think Bellimo also offers this actuator.
So when the boiler tank is hot a ∆ T control starts the pump with valve allowing flow as in the top drawing. When the storage is within 5 degrees of the boiler tank the pump stops. A second ∆ T function would start them pump, flop the valve and take that energy out of the storage and back to the boiler tank.
At least that is how I imagine this control logic to work. I'm open for suggestions.
The heat loads all pull from that boiler/ separator tank.
hr
I'm not that pleased with the operation it tends to thermosiphon when the checks are left out.I will try a 4 way valve with a motor that drives it from one extreme to the other. I had a sample of this valve a few years back to correct a radiant job that had a 1000' loop installed! The valve would flow into the loop from one end for 30 minutes, then flow from them other for 30 minutes. It actually did help the floor temperature even out by flip flopping the flow.
The valve was built up by Leif at Paxton. Basically it had a Honeywell 24V actuator motor bolted on. I think Bellimo also offers this actuator.
So when the boiler tank is hot a ∆ T control starts the pump with valve allowing flow as in the top drawing. When the storage is within 5 degrees of the boiler tank the pump stops. A second ∆ T function would start them pump, flop the valve and take that energy out of the storage and back to the boiler tank.
At least that is how I imagine this control logic to work. I'm open for suggestions.
The heat loads all pull from that boiler/ separator tank.
hr
Attachments
ewdudley
Minister of Fire
Do you think it would work to pipe the boiler directly to storage, and then have a loop that runs from storage to the primary tank? Then the boiler always knows what to do and so does the pump from storage to primary.huffdawg said:
goosegunner said:
I have a 1200 cfpm inline fan and will run the exhaust out through the wall of the boiler room. I have a plugin that is switched that I will connect it to.
ewdudley said:
Would having a pump pulling from the top of the primary to the bottom of storage then from the top of storage to the bottom of the primary work . Wouldnt it be like one big storage tank then?
Huff
ewdudley said:
Eliot wouldnt it take quite a long time to have usable energy that way. I spent a full day plumbin the boiler circ . to the primary tank I'm hoping there is a way to plumb in storage to the primary without having to take apart the boiler circuit.
Is there a way to not charge storage until all DHW. and heating loads are satisfied.
Cheers
in hot water said:Flow reversal can be done a couple ways. On mine I have two pumps facing each other. But remember the internal checks need to be removed
I will try a 4 way valve with a motor that drives it from one extreme to the other. I had a sample of this valve a few years back to correct a radiant job that had a 1000' loop installed! The valve would flow into the loop from one end for 30 minutes, then flow from them other for 30 minutes. It actually did help the floor temperature even out by flip flopping the flow.
The valve was built up by Leif at Paxton. Basically it had a Honeywell 24V actuator motor bolted on. I think Bellimo also offers this actuator.
So when the boiler tank is hot a ∆ T control starts the pump with valve allowing flow as in the top drawing. When the storage is within 5 degrees of the boiler tank the pump stops. A second ∆ T function would start them pump, flop the valve and take that energy out of the storage and back to the boiler tank.
At least that is how I imagine this control logic to work. I'm open for suggestions.
The heat loads all pull from that boiler/ separator tank.
hr
How much was that actuator valve worth HR.
- Status
Similar threads
