I have a problem. I am suspecting heating mat I got is not working. It is barely warm to the touch, to the point I wonder if I'm imagining it. It's parameters are 230V, 16W, 26.5 x 28 cm. It's flat and supposed to have similar heating on both sides. Manufacturer declares almost all heat it gives is conductive. Ambient is 20 degree Celsius.
I can't find an equation to find out what expected temperature should be. I found equations for a wire, not for a pad.
Note, I will check it with ohmmeter when I'll get my electrical toolbox back. Or when I'll buy a new one. But the temperature calculation seems like a problem interesting enough in its own right.