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%Ew function


Old name
%EwR


Function
The function returns the water enthalpy [kJ/kg].
The result is a real value.
Declaration
REAL %Ew(
   REAL in p, 
   RELA in t
 )
Parameters
pRelative water pressure (related to the atmospheric pressure) [MPa].
tWater temperature [°C].

2 Comments

  1. Anonymous

    Prosím dopísať do popisu, či sa jedná o absolútny tlak, alebo pretlak. (Szilárd)

    1. Dopisane. Jedna sa o relativny voci atmosferickemu tlaku. Vid

      https://www.yumpu.com/en/document/read/18796009/handout-g1-saturated-water-temperature-table-che-31-

      pre 200 stupnov je entalpia pr 1554.9 kPa podla tabulky 852.26 kJ/kg.

      Vypocet z D2000:

      Ak zadany relativny tlak 1.4549 MPa (voci atmosferickemu 100kPa)

      %Ew(1.4549, 200) = 852.276

      Ak zadany absolutny tlak 1.5549 MPa

      %Ew(1.5549, 200) = 852.312

      Blizsia je ta prva hodnota (aj ked aj ta uz je vyssia ako tabulkova .. zrejme sa jedna o nepresnosti aproximacnej funkcie).

      Podobne je to pre 5 stupnov. Relativny tlak sedi lepsie.

      humaj

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