The plot above shows the electrical input power, Pin, and the measured heat output power, Pout, (plotted on a 0-200 watt vertical scale) versus time. The plot covers a 6 hour period, each horizontal division is 1 hour. Also plotted are the transducer voltage, V (on a 0-1000 volt scale), the transducer current, I (on a 0-1 amp scale), and the measured power factor, PF (on a 0-1 scale).

The most noteworthy aspect of this data is the excellent agreement between Pin and Pout for several different operating conditions. During the first hour, the chamber was not pressurized and the transducer amplitude was low. During the 2nd hour, the amplitude was increased significantly resulting in almost 170 watts of power being delivered to the chamber. During the 3rd hour, the chamber was pressurized to 20 psi. This causes a pronounced increase in voltage and a reduction in power factor. For the 4th hour, the pressure was removed and the transducer was operated at a very low amplitude.

Under all four conditions, the Pin and Pout traces lie right on top of each other indicating excellent agreement between the electrical power measured by the Clarke-Hess 2330 and the heat output power measured by our water-flow calorimetry.