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down and the belt connecting the turbine to the generator removed. This would allow the turbine to free spool to over 3600 RPM without damaging the generator and let Mark get a better sense of where the turbine wanted to run. Upon restarting the ORC, the turbine reached a maximum speed of approximately 10,000 RPM. This speed was measured with a laser tachometer as the frequency to voltage converted installed at the time could not interpret speeds above 5000 RPM. With the belt removed, there was no means to load the turbine and collect useful performance data. 7.2.1 Testing Day 1 Results 1. The turbine could not spin fast enough to run “where it wanted to” with a 1:1 turbine to generator belt ratio without risking damage to the generator 2. The pump’s pressure relief valve would not let the pump develop the differential pressure required to operate at the designed pressures 3. The hand built frequency to voltage converter was malfunctioning and not reading accurate speeds as checked by a laser tachometer. As a consequence of issue (1) above, the belt ratio was modified to 3:1. The bearings on the turbine secondary shaft were also replaced with Sealmaster NPL-16T bearings as the original ones were rated to 5000 RPM. Each NPL-16T has a L10, 50000 hour rating at 8000 RPM and 44.9 kg load. The shaft the bearings support is subject to a 87.3 kg load from the belt. Short periods over 8000 RPM during future testing were deemed non-detrimental to the bearings as heat buildup is the primary cause of failure in this application. 47PDF Image | ORC WASTE HEAT RECOVERY SYSTEM WITH A TESLA-HYBRID
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