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Repeat Prob. 8.69 for ? = 0.8 ± 0.04.
Prob. 8.69:
The temperature of a surface is to be measured with a radiometer at temperature levels of 350 and 600 K. The emissivity of the surface is estimated as ?= 0.3± 0.03 and the absolute uncertainty of the measurement of emitted energy is estimated or specified by the instrument manufacturer as±1.0 percent of the emitted energy the instrument would measure from a black surface at 500 K. Determine the uncertainty in the determination of the two specified temperatures. State the relative influence of instrument uncertainty and surface emissivity uncertainty.
A turbine receives air at 1500 K, 1000 kPa and expands it to 100 kPa. The turbine has an isentropic efficiency of 85%. Find the actual turbine exit air temperature and the specific entropy increase in the actual turbine.
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