Multi-objective fuzzy optimization of capillary heat exchanger for surface water-source heat pumps

With the characteristics of high efficiency and easy installation, capillary heat exchanger is gradually paid more attention as the heat exchanger of water-source heat pump system. However, there are many interacted factors involved in the design stage, including flow velocity in pipes, temperature of inlet and outlet, pipe length and branch number. Therefore, it is of great significance to improve the performance of heat exchanger through optimization design. Proposes a multi-objective optimal design method for heat exchanger using heat transfer area, resistance and heat transfer efficiency as three independent objective functions. Establishes a multi-objective fuzzy optimization mathematical model of capillary heat exchanger. Transforms the multi-objective optimization problem into a single objective optimization solution by linear weighted method. Obtains the design parameters of capillary heat exchanger meeting the requirements of economy and high efficiency. Proves the feasibility and superiority of the method compared a practical calculation with reference methods.