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reference specific enthalpy

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Old   March 9, 2005, 05:00
Default reference specific enthalpy
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Mohammed
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Hi all, Which is the physical interpretation of reference specific enthalpy in the definition of the specific heat capacity? Thank you in advance
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Old   March 9, 2005, 21:41
Default Re: reference specific enthalpy
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Neale
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It's just the base enthalpy level for the material. i.e. h = h_ref at T=T_ref, p=p_ref.

For a constant cp gas:

h - h_ref = cp*(T-T_ref)

For a single material the value of h_ref does not really matter. If you have combustion or phase change then it matters. eg, if you have water evaporating into steam then the h_ref values have to differ at a given T/P by h_fg.

Dan.

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