VAPOR calculates heat of evaporation for pure water L=VAPOR(t)computes the heat of evaporation for pure water. This can be used to compute the fresh water flux from latent heat flux. INPUT: t - water temperature [C] OUTPUT: L - heat of evaporation [J/kg]
0001 function L=vapor(t) 0002 % VAPOR calculates heat of evaporation for pure water 0003 % L=VAPOR(t)computes the heat of evaporation for pure water. This can 0004 % be used to compute the fresh water flux from latent heat flux. 0005 % 0006 % INPUT: t - water temperature [C] 0007 % 0008 % OUTPUT: L - heat of evaporation [J/kg] 0009 0010 % Range of validity: 0 <= t <= 100 deg C. Check value: at t=100 deg C, 0011 % L = 2.2566 x 10^6 J/kg. Reference: Landolt-Bornstein, Numerical Data 0012 % and Functional Relationships in Science and Technology. New Series, 0013 % Sundermann, J. (editor), vol. 3, subvol. a, Springer-Verlag, p. 256. 0014 % No formulas are known to be available for the change of the heat of 0015 % evaporation as function of salinity. 0016 0017 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0018 % 1/22/99: version 1.0 (contributed by RO) 0019 % 8/5/99: version 2.0 0020 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0021 0022 a0=2.50039e6; 0023 a1=-2.3683e3; 0024 a2=4.31e-1; 0025 a3=-1.131e-2; 0026 L=a0+a1*t+a2*t.*t+a3*t.*t.*t; 0027