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The system was not stable during the sweep from a turbine speed of 2000 RPM to 6500 RPM before the pump shutdown from overheating. Despite the unsteady system, a relative performance curve could be established and is shown in Figure 7-2. System performance is calculated according to equation (7.1): ̇̇̇ ̇ (7.1) where ̇ and ̇ is the work done by the expander and consumed by the pump respectively, ̇ is the energy consumed by the condenser fans and ̇ is the energy input to the working fluid in the vaporizer. All four condenser fans were assumed to be consuming their full 0.75 kW, likely a conservative assumption. During this test, the system was consuming more power than it was producing, hence the negative efficiency numbers. Also, the efficiency of the pump and motor VFD were not taken into account. The important result is that even with flow rate and turbine inlet temperature generally decreasing, system efficiency still increased from 2000 to 400 RPM. As mentioned previously, ORC system efficiency is strongly tied to expander efficiency. From this plot, the hypothesis that future testing with reveal that the turbine will run most efficiently near 4000 RPM can be made. 51PDF Image | ORC WASTE HEAT RECOVERY SYSTEM WITH A TESLA-HYBRID TURBINE
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