Abstract:Currently, China’s livestock breeding industry is rapidly scaling towards intensification, making environmental control in livestock houses crucial. In cold northeastern winters, insulation used to prevent heat loss leads to high humidity levels, which harms livestock. Therefore, an efficient dehumidification system is essential to reduce heat loss and improve conditions. An internal air circulation dehumidification system was designed based on condensation and moisture separation, utilizing natural cold resources for effective dehumidification and energy savings. However, the system’s performance was influenced by several control factors, including the temperature difference between inside and outside, dehumidification airflow rate, and refrigerant flow rate, which affected multiple objectives such as indoor temperature decrease, dehumidification rate, and energy consumption. Thus, the system required a multi-objective control strategy. An improved non-dominated sorting genetic algorithm-Ⅱ (INSGA-Ⅱ) was proposed to optimize the balance between insulation,dehumidification, and energy preservation strategies, avoiding local convergence. Verified through the Zitzler-Deb-Thiele (ZDT) test functions, INSGA-Ⅱoutperformed the traditional NSGA-Ⅱ in both inverted generational distance (IGD) and generational distance (GD), reflecting a closer approximation to true solutions. In optimizing the dehumidification system, the INSGA-Ⅱ algorithm reduced the spacing (SP) value from 0.1118 in NSGA-Ⅱ to 0.0202,significantly expanding the optimal solution domain and preventing local optima. The operational efficiency was increased by 106.42%, and the solution speed was improved. In terms of temperature regulation, the average temperature drop using INSGA-Ⅱ was 1.43℃ lower than that of NSGA-Ⅱ, achieving a 23.06% reduction, which helped to reduce temperature fluctuations and energy consumption 〖JP3〗during dehumidification. Thus, the INSGA-Ⅱ algorithm effectively enhanced the multiobjective optimization and control performance of the internal circulation dehumidification system in livestock houses.