New home build with two GSHPs

skyking · 01-22-23, 03:44 PM

hello all. It has been a while. We are in the planning stages of our new home build now.
You may recall I helped my brother with his system.
https://ecorenovator.org/forum/showthread.php?t=1575

The new house is 2 stories over an unfinished ICF basement. It will have a dedicated equipment room in the basement for all my fiddly infrastructure pleasure.
The proposed plan is 6 tons of loops in a 4 or 6 pass trench layout, manifolded in the basement.
Primary heating will be a 3 ton hydronic unit.
the second unit is a 3 ton HVAC for supplemental heat and summer cooling.

The house has 1700 SF down and 1000 SF up, and about 2200 SF of hydronic heated floor area.
The basement will not get floor heating, due to the unfinished nature of it. I will give it air heating as needed to keep it a conditioned space, but being ICF it will be fully insulated from the start.
I will rough in some plumbing down there. It would not do to put a bunch of loops in the slab, only to have to cut them when cutting in plumbing in the future or for future owners, so the heated slab is not a happening thing.

skyking · 04-06-24, 10:55 AM

hello! things are moving forward. Design changes:
1) hydronics are in the basement slab too. There is about 3600 SF of heated surface after deducting beams and walls and staircases.
2) planning on heating it with vacuum tube collectors and a heat storage mass of 150 metric tons of soil at ideal moisture. This will be divided in two masses to allow for ideal Delta T. It will be insulated to R80 and the top of the mass is 12" below grade.
3) I have run the Manual J load calculations and the heating and cooling needs are 25K and 22K. I will install a 3 ton Bosch GSHP for the HVAC system.

01-22-23, 03:44 PM	#1
skyking Helper EcoRenovator Join Date: May 2011 Location: Western Washington Posts: 91 Thanks: 47 Thanked 20 Times in 13 Posts	New home build with two GSHPs hello all. It has been a while. We are in the planning stages of our new home build now. You may recall I helped my brother with his system. https://ecorenovator.org/forum/showthread.php?t=1575 The new house is 2 stories over an unfinished ICF basement. It will have a dedicated equipment room in the basement for all my fiddly infrastructure pleasure. The proposed plan is 6 tons of loops in a 4 or 6 pass trench layout, manifolded in the basement. Primary heating will be a 3 ton hydronic unit. the second unit is a 3 ton HVAC for supplemental heat and summer cooling. The house has 1700 SF down and 1000 SF up, and about 2200 SF of hydronic heated floor area. The basement will not get floor heating, due to the unfinished nature of it. I will give it air heating as needed to keep it a conditioned space, but being ICF it will be fully insulated from the start. I will rough in some plumbing down there. It would not do to put a bunch of loops in the slab, only to have to cut them when cutting in plumbing in the future or for future owners, so the heated slab is not a happening thing.

04-06-24, 10:55 AM	#2
skyking Helper EcoRenovator Join Date: May 2011 Location: Western Washington Posts: 91 Thanks: 47 Thanked 20 Times in 13 Posts	hello! things are moving forward. Design changes: 1) hydronics are in the basement slab too. There is about 3600 SF of heated surface after deducting beams and walls and staircases. 2) planning on heating it with vacuum tube collectors and a heat storage mass of 150 metric tons of soil at ideal moisture. This will be divided in two masses to allow for ideal Delta T. It will be insulated to R80 and the top of the mass is 12" below grade. 3) I have run the Manual J load calculations and the heating and cooling needs are 25K and 22K. I will install a 3 ton Bosch GSHP for the HVAC system.