Abstract
Three-fluid heat exchanger having two thermal communications is divided into two types, normal three-fluid heat exchanger (Type-A) and two two-fluid heat exchangers (type-B). Using the domain map of two dimensionless heat capacity rate ratios, the optimum type is obtained, considering the difference in the inlet temperature ratio, NTU and the overall heat transfer coefficient. In Type-B, the optimum non-dimensional length of heat exchanger is connected with the inlet temperature ratio.
