Effective thermo-hygrometric control is essential for buildings and greenhouses, particularly in green and low-carbon production. There is growing interest in integrating heat pumps with liquid desiccant systems to enhance energy efficiency and reduce system size in air moisture control. The current study investigates a novel liquid desiccant system combined with a heat pump for continuous, energy-efficient dehumidification and regeneration in horticultural crop cultivation in greenhouses. The uniqueness of the developed system lies in its integration, contrasting with previous liquid desiccant systems designed with separate dehumidifier and regenerator. A semi-theoretical model is developed and validated using in-house experimental datasets to simulate novel liquid desiccant system performance. Results demonstrate that the system effectively maintains air humidity levels, with a maximum enthalpy demand for dehumidification of 99.1 kJ/kg at a solution temperature difference of 40 °C during summer. The minimum achieved moisture content with lithium chloride, calcium chloride, and potassium formate is 7.64 g/kgda, 8.1 g/kgda, and 7.78 g/kgda, respectively, while regeneration produces maximum moisture contents of 23.5 g/kgda, 23.9 g/kgda, and 23.7 g/kgda. The system's maximum effectiveness reaches 76 %, 75 %, and 74 % for lithium chloride, calcium chloride, and potassium formate, respectively. When dehumidification demand exceeds 1,500 h annually, the payback period is five years or less, making the system suitable for new installations and retrofits. A case study considering outdoor conditions in the northeastern United Kingdom presents simulation results for two distinct scenarios, demonstrating the system's potential in real-world applications.

中文翻译：

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热泵辅助液体干燥剂系统在温带海洋气候温室中连续除湿和再生的可行性


有效的温湿度控制对于建筑物和温室至关重要，尤其是在绿色和低碳生产中。人们越来越关注将热泵与液体干燥剂系统集成，以提高能源效率并减小空气湿度控制的系统尺寸。目前的研究调查了一种新型液体干燥剂系统与热泵相结合，用于温室园艺作物种植中的连续、节能除湿和再生。所开发系统的独特之处在于其集成性，与以前设计有独立除湿机和再生器的液体干燥剂系统形成鲜明对比。使用内部实验数据集开发和验证了一个半理论模型，以模拟新型液体干燥剂系统的性能。结果表明，该系统有效地保持了空气湿度水平，夏季在溶液温差为 40 °C 时，除湿的最大焓需求为 99.1 kJ/kg。氯化锂、氯化钙和甲酸钾的最低水分含量分别为 7.64 g/kgda、8.1 g/kgda 和 7.78 g/kgda，而再生产生的最大水分含量为 23.5 g/kgda、23.9 g/kgda 和 23.7 g/kgda。该系统对氯化锂、氯化钙和甲酸钾的最大有效性分别达到 76 %、75 % 和 74 %。当除湿需求每年超过 1,500 小时时，投资回收期为 5 年或更短，使该系统适用于新安装和改造。一个考虑英国东北部户外条件的案例研究提供了两种不同场景的仿真结果，展示了该系统在实际应用中的潜力。