4. For each component, calculate zero pressure enthalpy and entropy, following relations.

ho

Ꭱ '

where R=1.98583 cal/mol, K.

5. Zero pressure enthalpy and entropy of dry air and water vapor are then obtained by

10. Calculate humidity ratio and mole fraction of moisture saturated air.

14. Calculate the properties of moist air saturated with water vapor.

-1/2(1-Ys)3BwwwP]}-109.782 +859.099Ws, B.t.u./lb. of dry air

453.5924

){

82.0567

Ріт

-[(Y A aa+2Ys(1 − Ys) Aaw+ (1-Ys)2 Aww)

-(1-Ys)3AwwwP]}ft3/lb. of dry air

3. CF Program

Comments: When t≥ 112 °F, this program CF is used to find correction terms for h and v calculated by

h=ha+ (W/Ws) (hs-ha), V=Va+ (W/Ws) (Vs-Va).

Input: t= dry bulb temperatures (F)

W = humidity ratio (lb H2O/lb of dry air)

W= humidity ratio of saturated moist air (lb H2O/lb of dry air)

Output: V = correction terms to the volume v (ft/lb of dry air)

h = correction term to the enthalpy h (Btu/lb of dry air)

Calculation procedures:

1. Use the Lagrangean interpolation technique to pick up A and B from the following table: