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Solar hybrid, the most efficient combi system?
An idea I have, I am living in a 1890's home which was carved up into a four-plex in the 30's. We are in the process of returning it to a single family home.
The first floor is now gyp-crete with tubing 8" on center. Insulation below is four inches of foam in each bay with another 2 inches nailed to the joists below. The ceiling height is 10'. I have added a second two by four exterior perimeter wall "double envelope", giving me 9" wall system.
My idea for the solar hybrid system works like this, the floor would be heated with solar through a brazed plate heat exchanger off a solar primary loop, Bristol Stickney'ish. Programmable thermostat for the floor calls for heat of 74 degrees at 8am til 4:30, 5:30, 6:30 based on time of year. Solar tank sensor is in a thermal well in the primary solar loop. Any heat energy put in the primary loop will be delivered to the gyp-crete floor first. Solar storage tank will be after the radiant floor off the solar primary loop. I plan to install a btu meter on the floor supply/return leaders.
Room comfort temperature will be met with a radiant ceiling and another thermostat set to my desired room temperature. Ceiling fluid will be heated with a ground source heat pump.
I have a 576 sq ft garage with 3 30 tube Apricus ET's panels It has been my test platform, low winter temperature with solar only heat has been 42, a warm 42 with heated slab. It runs every day in the winter, every day!
New Era Plumbing & Heating