Despite the recognition of its energy-saving potential, the promotion of liquid desiccant air-conditioning system is limited by the drawbacks of existing desiccants in long-term or large-scale use. Deep eutectic solvent with good bio- and eco- friendliness has not yet been tested for systematic study in air-conditioning system. In this paper, a deep eutectic solvent, ethaline, is utilized in a heat pump driven liquid desiccant air-conditioning system, whose energy, exergy, exergoeconomic and enviroeconomic performances are studied. Under basic condition of ambient temperature of 35 ℃ and relative humidity of 80%, its systematic coefficient of performance reaches 1.406 with exergy efficiency of 32.65%. Meanwhile, 52.36% CO₂ emission can be reduced compared with conventional condensation dehumidification air-conditioning system. The payback period of such system at basic condition with 20 kW cooling load is 14.4 years, and it can be significantly reduced in applications with larger cooling load. Parametric analyses for different requirements and environments are conducted as well. The energy and environmental superiority of ethaline is more significant under more latent loads, higher supply air flow rate and lower fresh air ratio. Under ambient temperature ranging from 28 ℃ to 40 ℃, the effect of CO₂ emission reduction for ethaline reaches to extents of more than 38%. The advantages of ethaline are further illustrated in comparison with other potential desiccant candidates, in aspects of toxicity, price and corrosiveness. The potential performance improvement approach for ethaline used as liquid desiccant is also proposed and discussed. The results in this paper demonstrate the promising prospect of ethaline quantitatively, and provide enlightening for exploration of new liquid desiccant. In pace with the broadening application of air-conditioning system, liquid desiccant air-conditioning system using such green desiccants can be promoted, which brings out great prospects in energy saving and CO₂ emission reduction.

尽管人们认识到其节能潜力，但液体除湿空调系统的推广受限于现有除湿剂在长期或大规模使用中的弊端。具有良好生物和生态友好性的低共熔溶剂尚未在空调系统中进行系统研究测试。在本文中，将低共熔溶剂乙醇用于热泵驱动的液体除湿空调系统，研究了其能源、火用、火用经济和环境经济性能。在环境温度35℃、相对湿度80%的基本条件下，其系统性能系数达到1.406，火用效率为32.65%。同时，52.36% CO ₂与传统的冷凝除湿空调系统相比，可减少废气排放。该系统在20kW冷负荷的基本工况下投资回收期为14.4年，在更大冷负荷的应用中可显着缩短。还针对不同的要求和环境进行了参数分析。在更大的潜负荷、更高的送风量和更低的新风比下，乙醇的能源和环境优势更为显着。在28℃至40℃的环境温度范围内，CO _2的影响乙醇的减排量达到38%以上。与其他潜在的干燥剂候选物相比，乙醇胺在毒性、价格和腐蚀性方面的优势得到进一步说明。还提出并讨论了乙醇用作液体干燥剂的潜在性能改进方法。本文的研究结果定量论证了乙醇胺的广阔前景，为探索新型液体干燥剂提供了启示。随着空调系统的广泛应用，使用这种绿色除湿剂的液体除湿空调系统得到推广，在节能减排CO ₂方面具有广阔的前景。