Insert Table The capacity rates in Table were obtained from the flow data of Batmaz and Sandeep and the thermophysical properties of the water and the mixture as described in Bertoli et al. . Batmaz and Sandeep determined the global heat transfer coefficients, 𝑈 0,𝑙𝑚 and 𝑈 1,𝑙𝑚 , based on the logarithmic mean of the inner and outer heat transfer areas of the tubes. It was, therefore, necessary to adapt them to the definitions given in Section 3.1: