Hi Alternative technologists
I need your ideas, if you will:)
I have in-slab hydronic floor heating for my entire house.
This is heated by two modes.
During the day a Grundfos 3 speed circulation pump, takes water onto the roof, through 3 BOSCH solar water panels, then to the floor. In full sun it produces 30-70c water. I change the circulation speeds depending on the months, to assist the water get as close to 40c as possible. As 40c is the most desirable temp for floor heating intake.
This systems runs most days, but doesn't get hot enough on very rainy and foggy/overcast days. On those days an instantaneous gas booster is used.
From mid November to March it remains switched off, as heat isn't needed.
My plan is to add 2 things to this system.
1... a small plunge pool. For a heat loss system. And for fun. 60m of copper coils are in the base of this, in a screed, and the piping is in copper [to allow for extreme heat] this avoids the need for a heat exchange [this design is copied from the guys making heated pools for horses up here, so I'm guessing its the most effiencent means.
2 ... set of 30-60 evacuated tubes, possible with a roof top 250L tank with a low pressure copper tube inside , to supply more heat in the colder months, and ensure an excess of heat for much of the year.
My idea is to simply add this into the system at the end of the line
Circuit order -
house slab exit flow, one way valve, pump, Bosch solar panels, pressure release valve, expansion tank, evacuated tubes, pressure release valve, thermal valve, hot into slab, house slab exit flow ....cont...]
I'm thinking there must be a thermal valve which can assist me. Maybe a series of them.
I figure if the floor slab can take the hot water 20-50c,
then a thermal valve could divert the water above 50c, to the pool slab heating circuit,
and somehow this could be integrated, so that some of the hot water could be tempered down to still maintain 50c water circulation through the house floor slab circuit, and the excess go to the pool slab circuit.
My thoughts are that tempering valves could be used to achieve this, in conjunction with some very small buffer tanks.
I'm just not sure how to configure this, or what valves to use.
Does anyone have some guidance or advice here.
Any and all advice will be valued:)
Jimmy wants solar:)