If you have to use water-glycol for central heating in a place where the minimum temperature is minus 7 deg celcius,
I have some questions:
1. How do you decide the glycol-water mixture ratio so that the water in the pipes does not freeze? For -7 celcius ambient.
2. What would be the heat carrying capacity of the water-glycol mixture as determined above? How to select the radiator size?
2. What pumps do you need for glycol pumps and glycol-water pumps? What variables are required to select these pumps?
(Glycol pumps for glycol makeup circuit; glycol-water pumps for circulating hot glycol-water mixture in the building, for heating the building, using strategically placed radiators thru which the water-glycol loses heat to the conditioned space.)