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Mikesolar · 10-19-12, 08:15 PM

I was wondering whether a system like this coupled with something that measures the exact distance between two fins, which would have to be precise, and compare the distance with frost/no frost on it. There are many types of frost or snow, some more reflective than others so maybe it would work better with two sensors........or maybe I am making things a bit too complicated. I had a big problem with defrost last year on an ASHP and it is still not resolved.

The evap design i have now will have the coil at about a 20deg angle from vertical so your sensor may work without being in a special compartment as it is under the coil and away from the sun.

10-19-12, 08:15 PM	#9
Mikesolar Master EcoRenovator Join Date: Aug 2012 Location: Toronto Posts: 958 Thanks: 40 Thanked 158 Times in 150 Posts	I was wondering whether a system like this coupled with something that measures the exact distance between two fins, which would have to be precise, and compare the distance with frost/no frost on it. There are many types of frost or snow, some more reflective than others so maybe it would work better with two sensors........or maybe I am making things a bit too complicated. I had a big problem with defrost last year on an ASHP and it is still not resolved. The evap design i have now will have the coil at about a 20deg angle from vertical so your sensor may work without being in a special compartment as it is under the coil and away from the sun. Last edited by Mikesolar; 10-19-12 at 08:17 PM..