The error in thermocouple reading is far larger than suggested. The best place to get an accuracy check is when Mats Lewan measured the water output flow from the heat exchanger at 18:57 during the October 6 test. He carefully measured the water out of the exchanger and calculated the flow rate as .91 grams/second. He then assumed it was all vapor which condensed within the exchanger and this is the results.
6.1 C x 4.18 joules/C-grams x 178 grams/second = 4538.644 watts According to thermocouple data.
My simulated error is :
Primary Input (HOT): 100 C water at 15 liters/hour.
Secondary Output (COLD) : 30C water at 600 liters/hour (40x ratio)
Ambient : 30 C
Thermocouple : 31.96 C
Secondary Outlet : 30.78 C (raised slightly from 30C by conduction through the manifold).
Difference : 1.19 C (or 3.8 %)
But I calculated the PERCENTAGE error against the OUTPUT water temperature, not against the Delta-T of (say) 6C
The error in Delta-T is 1.19/6 = 20 %
I guess it moves it back into the problematic zone !!!!
