The potential artifacts (from cursory reading) are:
(1) RFI to thermocouples
Stringham measured all types of radiation. I knew that You wouldn't like the Alpha Bremsstrahlung, as this will hurt some friends of You...
Citation of Stringham:
CALORIMETRY
The calorimetry is simple and conservative. We look at the data generated at steadystate
temperature conditions with the Qi pulsed one minute on and one minute off to help clarify the
magnitude of the radio frequency, RF, interference during the thermocouple measurements. The
contribution of RF to the temperature measurements of T in and Tout was at most + 0.2 of a 2 degree C.
(2) Wrong estimation of electrical system power loss
Was this an argument or a joke? Should he account for the transmission losses in the public network??
(3) density change in mass flow due to bubbles
I guess You just drunk one soda to much. You believe that collapsing bubbles in the output cause a change in massflow, that's more than
hilarious! The all collaps between the sender and the target. But You didn't read the paper, so it's just a wrong guess...
(4) deltaT due to phase change in circulant between input and output of cavitation chamber.
I personally know at least 4 phase changes of water between 30 and 60 degrees.. or are there 7??
Or may be You think Stringham used a micro wave oven and opennend the door to output the mass?