This paper presents the heat transfer characteristics of the evaporators in a double-evaporator refrigerating system with an environment-friendly refrigerant, propane (R-290). Based on the Buckingham Pi theorem, dimensionless correlations are developed to predict the heat transfer coefficients of the refrigerant in high- and low-temperature evaporators (h(H) and h(L)) and the ratio of the cooling capacity of the high-temperature evaporator to the total capacity (alpha) in the system. The results show that h H is affected mainly by the condensing pressure, the length of the low-temperature capillary tube, and the logarithmic-mean temperature difference of the high-temperature evaporator, while h H is affected mainly by the length of the high-temperature capillary tube and the logarithmic-mean temperature difference of the low-temperature evaporator. Note, though, that the condensing pressure and the logarithmic-mean temperature difference of the high-temperature evaporator are the main factors affecting alpha. Some of the correlations result in good predictions, though the required numbers of variables of these correlations are much more than those presented in this work. A comparison of the experimental measurements of h(H) and h(H) to the values calculated by the correlations from the literature is made. Some of the correlations result in good predictions, though the required variables of these correlations are much more than those presented in this work.