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PERF9RMANCE MEASURES AND CALCULATIONS 21 suSroutine. Tne properties used in the state specification are labeled by the use of logical variables passed through a conmon statement. The output properties are passnd as argunents to the main progran. Paraneters calculated by the program are inlet and exhaust pressure, pressure ratio, total mass flow rate, inlet enthalpy, inlet quality, power, efficiency, leakage rate, exhaust quality, specific size and specific speed. Other dimensionless parameters potentially useful in modeling include leakage ratio, power specific size, power specific speed and specific power. The individual mass flow rates are calculated using calibration constants peculiar to the calibration period and orifice plates used for a given run. The total flow rate is simply the sun of the hot water and steaa flow rates. The inlet enthalpy is obtained from the mass flow rates and the enthalpies of the hot water and stearn. The hot water enthalpy is estimated using the expression for an idealized inconpressible fluid with constant specific heatC51. h2 -hl = cp(T2 -TI) + v(P2 -PI) Since the specific volume(v) is very small, the enthalpy can be accurately estimated by taking T = Tsat. Then: h, = hf(Tw) [Steam Table Call] Where: hw is the hot water enthalpy hf is the enthalpy of a saturated liquid Tw is the water temperature The steam enthalpy is measured by flashing the stean to atmospheric pressure in a calorimeter. The state of the throttled steam is defined by the calorimeter temperature and atmospheric pressure. The enthalpy is assurned constant for the throttling process in the calorimeter. The steam enthalpy is then given by: hs = hc = h(Tc, Pat") [Steaq Table Call1 Where: hs is the steam enthalpy hc is the enthalpy of tho throttled steam TC is the calorirneLer temperature \ .. .--,..-I-PDF Image | EMPIRICAL MODELING OF A LYSHOLM HELICAL SCREW EXPANDER
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