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Turbo-expander Alternator Cooler Compressor V1 0.5MPa 300K 1MPa to HTS from HTS V3 Heater V2 V4 Heat exchanger unit Cold box FIGURE 4. The flow diagram and photograph of the cold box 300 280 260 240 220 200 180 160 140 120 100 80 60 40 Inlet temperature Outlet temperature 0 60 120 180 240 300 360 420 480 540 600 Time (min) FIGURE 5. The cool-down data curve The inlet pressure of the compressor is kept constant at 0.5 MPa and its discharge pressure is adjusted at 1 MPa by means of the bypass valve. In this performance test, the measured pressure of the turbine inlet is lower than the design value due to the pressure drop of the components such as heat-exchanger unit, filter, piping and valves. Then, the turbine outlet pressure is higher than the design value due to the similar pressure drop and the turbine pressure ratio in TABLE 2 is 1.8. However, U/C0 was in the range of optimum speed ratio, namely 0.65 ~ 0.7, though the rotational speed is lower than design speed. Therefore, we can obtain higher efficiency at the pressure ratio of 1.8. FIGURE 6 shows the measured and predicted turbine efficiencies for two impellers in FIGURE 2. In type-A, the measured maximum efficiency is approximately 70 % at U/C0 = 0.645. In type-B, the measured maximum efficiency is 67 % at U/C0 = 0.645. Deterioration of turbine efficiencies in type-A due to the negative effect of a small throat area was a concern during the design. However, the measured efficiencies of type-A is higher than 900 Temperature (K)PDF Image | NEON CRYOGENIC TURBO-EXPANDER WITH MAGNETIC BEARINGS
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