Subscripts ∞ and ew represents the properties of liquid (water)
at reactor bulk (T∞) and evaporator wall (Tew) temperatures. x ¼ Le/
2, where Le is evaporator tube length. Properties of water are
estimated at mean temperature i.e. Tm ¼ ((T∞ þ Tew)/2).
Air side heat transfer coefficient from condenser external surface
to ambient air (hca) can be calculated from Eq. (12) [13]