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Plumbing / Re: UG Pex Sizing and System Setup
« on: October 30, 2012, 01:51:02 PM »
Understood and thank you. I think what you are saying re: the head loss is that I want to make sure that Im getting an actual 11 GPM through the pipes and not just a pump that is rated for 11 GPM.... ie factor in losses. You brought up a point which I didn’t consider but will pose now ... that is if the system requires +/- 11 GPM using just one primary pump and zone valves, what do you think would be the requirements if I had a pump at the boiler to circulate out to the building then separate pumps for the modine and the floor loop ? I would assume they could be smaller but then again if both zones are calling at the same time, there would need to be enough flow to satisfy everything ... I am looking from an electric efficiency point of view in that I think I want a smaller circ pump that runs basically 24/7 to reduce electricity demands. Does that make sense?
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Plumbing / Re: UG Pex Sizing and System Setup
« on: October 26, 2012, 02:53:57 PM »
RSI
I did a rough skketch of what I think you are telling me. If I understand you correctly the HW from the boiler needs to run through the modine first then hit a second pump and run throught the floor. My question would be that if I set the floor temp higher than the modine ( when the shop isnt in use for example), the themocouple on the modine will kick it on when that wouldnt be the intent. Maybe I am missing something?? I want to be able to run the radiant heat without necessarily running the modine, as I would use it just for quick heat.
I did a rough skketch of what I think you are telling me. If I understand you correctly the HW from the boiler needs to run through the modine first then hit a second pump and run throught the floor. My question would be that if I set the floor temp higher than the modine ( when the shop isnt in use for example), the themocouple on the modine will kick it on when that wouldnt be the intent. Maybe I am missing something?? I want to be able to run the radiant heat without necessarily running the modine, as I would use it just for quick heat.
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Plumbing / UG Pex Sizing and System Setup
« on: October 25, 2012, 02:28:56 PM »
Hi all. Ive been reading many of the posts here and am sure Ive stumbled on the right place. I just got a pretty large OWB and and starting the system design / install. I have a new 1100 SF shop with 16ft. ceilings that has 5/8 " Viega Pex installed 1' OC. that is about 30 ' from the OWB. I ll install a water heated Modine as well for quick heat as well. The shop will have a small HW heater with a Plate HX for when the boiler is on.
The boiler will also be used to heat my house which is about 150' from the OWB. I want to install an air/water HX in my hot air furnace and use the fan of the furnace to distruibute the heat. I will also be installing a Plate HX for domestic HW in here for when the boiler is running . My basement will need heat too so I was thinking a small modine or a couple sections of baseboard.
I have many questions but Ill start with the largest which is what size UG pipe should I be putting in? My gut is saying to me 1 1/4" but I dont know for sure. I certainly dont want to undersize and have to do it twice, but I dont want to end up with huge pipe that will require more pump for no reason.
What about air / water HX sizing ? Do I just get the same BTU rating as what my furnace outputs or different?
What about pump sizing or placement ? Should I have one pump that delivers water to the building then a second to push through the radiant and a third to go to the modine? Or just one big pump? How would this be sized? As a side note, the boiler has serveal inpout and output connections so the shop and house will be on seperate loops.
Ive got many more questions on controls etc. but Ill leave it at that for today. Thanks for the help and look forward to being part of this site and forum.
~Seth.
The boiler will also be used to heat my house which is about 150' from the OWB. I want to install an air/water HX in my hot air furnace and use the fan of the furnace to distruibute the heat. I will also be installing a Plate HX for domestic HW in here for when the boiler is running . My basement will need heat too so I was thinking a small modine or a couple sections of baseboard.
I have many questions but Ill start with the largest which is what size UG pipe should I be putting in? My gut is saying to me 1 1/4" but I dont know for sure. I certainly dont want to undersize and have to do it twice, but I dont want to end up with huge pipe that will require more pump for no reason.
What about air / water HX sizing ? Do I just get the same BTU rating as what my furnace outputs or different?
What about pump sizing or placement ? Should I have one pump that delivers water to the building then a second to push through the radiant and a third to go to the modine? Or just one big pump? How would this be sized? As a side note, the boiler has serveal inpout and output connections so the shop and house will be on seperate loops.
Ive got many more questions on controls etc. but Ill leave it at that for today. Thanks for the help and look forward to being part of this site and forum.
~Seth.
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