Quote:
Originally Posted by jeff5may
..Looks like the unit in the above pic is missing a method of heat transfer for the evap coil. Concrete does not qualify as a heat transfer fluid, mainly because it is a solid.
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jeff5may,
The unit above - is just a test unit to see an ability of concrete slab to absorb extremely cold air (
-5.5°C - see thermometer) with little help (12V small fan).
And only after multiple tests I decided to demolish my oil-fired boiler...
Of cause, if your house is not perfectly insulated and you have to provide more BTUs - you have to use traditional types of heat exchangers.
Nevertheless, the above posted video is the good proof that my concrete slab is an excellent heat exchanger.
To understand how my idea is reasonable. you can see my electric bills here:
https://sites.google.com/site/modernwaterboilers/
Boris Romanov