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78b4f0e7b5
use interpolation to avoid the division by zero when calculating incompressible fluid properties exactly at the base temperature or composition, closes #2295
33 lines
984 B
Python
33 lines
984 B
Python
import CoolProp as CP
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p = 1e6
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for fluid in ["PHE", "Water", "TVP1", "DowQ"]:
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CP.CoolProp.set_debug_level(0)
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state = CP.AbstractState("INCOMP", fluid)
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Tmax = state.trivial_keyed_output(CP.iT_max)
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Tmin = state.trivial_keyed_output(CP.iT_min)
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Tbase = (Tmax + Tmin) * 0.5
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state.update(CP.PT_INPUTS, p, Tbase + 1e-6)
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h_hi = state.hmass()
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s_hi = state.smass()
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state.update(CP.PT_INPUTS, p, Tbase - 1e-6)
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h_lo = state.hmass()
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s_lo = state.smass()
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state.update(CP.PT_INPUTS, p, Tbase)
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try:
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print(state.hmass(), "J/kg vs", (h_hi + h_lo) * 0.5, "J/kg")
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print(state.smass(), "J/kg/K vs", (s_hi + s_lo) * 0.5, "J/kg/K")
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except ValueError as e:
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# msg = (
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# "Exactly the middle between maximum and minimum temperature does "
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# f"not work for {fluid}."
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# )
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# print(msg)
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print(str(e))
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print((h_hi + h_lo) * 0.5, "J/kg and", (s_hi + s_lo) * 0.5, "J/kg/K")
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