The reactor was pumped down and filled with ~6000 Pa of D2 for calibration.
The left plots show heater power versus heat recovery (Instantaneous COP). I've labeled the mean recovery for the last 4 hours of each power step. This is the recovery that is plotted in the bottom recovery versus power plot.
The right plots show calorimeter input air temperature, output air temperature, and ambient temperature.
50W and 400W calibration
100W calibration
200W, 300W, 350W, 400W, and 450W calibration. The sudden dips in ambient temperature are real, and due to overhead door openings in the non-climate controlled space.
Recovery versus power.
Recovery is calculated using a constant Density = 1.2754 kg/m³ and Cp = 1005 J/kg C. The absolute value of the recovery should just be considered an estimate since the absolute accuracy of the airflow sensors is not great. The repeatability of the sensors and measured recovery is very good though and therefore the calibration can be safely used to detect anomalous results.