Another perhaps negative comment on the Clean Planet data.
In the high temperature system they now have two ways to estimate excess heat:
(1) radiation (with errors - they use a control to reduce them)
(2) coolant output temperature.
They say they do not use coolant because it has a long time constant. Understandable. But for overall excess power generation estimation that is surely just fine. Look at the 3 day long flat parts of figure 7, showing oil temperature very accurate for time longer than 9 hours, on tests run for 72 hours.
Therefore - it would be most interesting to look at the oil out temperature as a cross-check on their high temperature work. After all, the oil output temperature is a proxy for the real deliverable they want - significant excess output power over long periods.
It is IMHO a great shame that they do not disclose the overall excess power estimates they get from this.
It is good to know that if they ever wished to convince the scientific community they had something then this extra more accurate info could be added (always assuming it is positive).