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Energy Needed to Vaporize Ethanol

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Energy Needed to Vaporize Ethanol

This application calculates the energy needed to vaporize liquid ethanol at an initial temperature and pressure.

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with(ThermophysicalData):

Calculate the boiling temperature of ethanol at 101325 Pa

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boilingTemp := ThermophysicalData:-Property(temperature, pressure = 101325, Q = 0, "ethanol")

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Define a function that gives the specific heat capacity of ethanol at an arbitrary temperature

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Cp := proc (T) options operator, arrow; ThermophysicalData:-Property("C", "pressure" = 101325, "temperature" = T, "ethanol") end proc:

Hence the heat required to raise ethanol from 20°C to its boiling point

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heat1 := int(Cp(T), T = 273.15+20 .. boilingTemp, numeric)

154741.6213

Calculate the latent heat of vaporization

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heat2 := ThermophysicalData:-Property(enthalpy, temperature = boilingTemp, Q = 1, ethanol)-ThermophysicalData:-Property(enthalpy, temperature = boilingTemp, Q = 0, ethanol)

849613.4885

Hence the total energy required in J kg-1 is

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heat1+heat2

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