Erica Wisner wrote:I followed some of the pictures in the first link, and thought these were particularly interesting:
And a blog, probably someone who's getting one installed at home - again, no English content.
But if the channels are 400mm deep, then heat will naturally flow more on the top therefore heating the floor more than the ground.
Anyway, my first priority is to determine what size burning chamber is needed for a certain size room. Usually, the rooms i have seen heated like this are small. But temples also had the ondol and they were fired by multiple burning chambers.
Since the floor of this system is usually made of pretty soft material, hydronic tubing could be installed in the top layer, as a back-up. This would only be used on early fall/late winter when it's pretty cold outside to require heating but enough sun to heat the space. A direct gain would be best but sometimes this cannot be achieved due to the roof overhand or something else.
I would like to try this method with solar heat collectors, pushing air through the floor, not to heat a space, but create a nice passive thermal barrier. In its own envelope. It could be easily retro fitted. If there is enough sun to heat the envelope, then there would be enough sun to power a small dc fan.
I would also note, that the "intent" of these devices where not meant to heat, "certain sized room." This is a common misperception and "read-in" to what these did and how they functioned within the Asian cultural construct.
Many time the room itself was rather open, if not actually completely open to the outside elements with large veranda or portico and sliding wood and paper doors.
Well, if i'd do that in my climate i would be dead frozen...
If the Koreans felt comfortable on a warm floor with paper doors and somewhat exposed to the outside, i don't see any reason why the same floor won't give a comfortable room ambiance inside a more insulated house.