Circuit design and performance simulation of a small-diameter tube condenser of an air conditioner

Based on ε-NTU method, a steady distributed-parameter model of a condenser is established. By using this model and taking the performance of a φ 7 mm tube condenser as a standard, φ 5 mm tube condenser circuits are designed. The research results indicate that refrigerant pressure drop of the small-diameter condenser can be effectively decreased by adding more branches and properly reducing the branch length. While the small-diameter tube condensers have the heat transfer performance of the corresponding large-diameter tube condensers, the copper consumption of each small-diameter tube condenser is greatly reduced.