function F = iter1(x)
load('vars');
F(1) = mW*(hwein-cpWf*x(2)) + mL*(hLein-(0.00585*x(1)^3-0.497*x(1)^2+19.87*x(1)-207.61))-...
       CPr*lambda*(volkoeff*g*rhoL^2*(Tm-Tumg)*L^3*Pr/(eta^2))^(1/3)*Aaussen*(Tm-Tumg)/L;
F(2) = mL*((0.00585*x(1)^3-0.497*x(1)^2+19.87*x(1)-207.61)-hLein)-K*a*V*...
      (hwein-(0.00585*x(1)^3-0.497*x(1)^2+19.87*x(1)-207.61)-(cpWf*x(2)-hLein))/...
       log((hwein-(0.00585*x(1)^3-0.497*x(1)^2+19.87*x(1)-207.61))/(cpWf*x(2)-hLein));
end