# %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
 p Relative water pressure (related to the atmospheric pressure) [MPa]. t Water temperature [°C].

Related pages:

## 2 Comments

1. 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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