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1 TESTING PROCEDURES 17 corresponding to 119.6 psia, was used as the target temperature. The acceptance range for a given scan was plus or minus 1 OF. This corresponded to a pressure range of from 118:O to 121.2 psia. In practice, control was fairly easy and the data was usually well within these bounds. In particular, the standard deviation of the inlet pressure for the current series of tests was 0.7 psi. Exhaust pressure was accepted according to the same standards as inlet pressure. This meant an allowable variation in temperature of plus or minus 1 OF. For the pressure range encountered, an error of 1 OF corrosponds t o about 0.3 psia. The acceptance criteria for a single scan of speed was plus or minus 50 RPH. After averaging scans, the result was usually well within this criteria. Table 1 lists the mean of the scan averages, the standard deviation and the high and low scan average for both speed and inlet quality. The acceptance criterion for inlet quality or enthalpy was less rigorous. The main indicator of inlet quality was an indirect one, the flow ratio. In addition, even the flow ratio had to be calculated using the flow calibration constants. A data control program for flow ratio was developed and assigned as a user mode function on an HP-41C programmable calculator. This program can be found in the Appendix. Since inlet quality and enthalpy are also dependent on the water and steam enthalpies, a data control program for inlet enthalpy was also developed for days when the enthalpies deviated from their usual values. The general data acceptance criterion for a single scan was plus or minus 0.05 in flow ratio. For reasons discussed in the description of the experimental system, the lower water flow rates associated with higher qualities were both harder to control and to measure. In addition, inlet quality and inlet enthalpy are both more heavily dependent on flow ratio for higher inlet qualities. The data control for lower qualities was thus much better than for higher qualities. Of course, for the runs with pure steam having a quality of 99%, control of quality \PDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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