Abstract
As one of the essential dehumidification ways, liquid desiccant air conditioning system has developed quickly in recent years, especially in the deep dehumidification field. A novel hybrid deep- dehumidification system using liquid desiccant driven by heat pump is proposed in this study to simplify the arrangement of air ducts and guarantee a competitive energy efficiency. In the proposed process, the regenerator, condensing dehumidifier and liquid dehumidifier are cascaded, and the process air flow through them sequentially. Heat pump cycle is utilized in the system, where the cooling capacity of evaporator is used to cool the liquid desiccant in dehumidifier, and the heating capacity of condenser is used for desiccant regeneration. The humidity ratio of the supplied air is as low as 2.6 g/kg. No extra regeneration air or corresponding air duct are needed in the proposed process, which obviously simplifies the layout of the system. Performance of the proposed system is then analysed by numerical results. It’s indicated 17.5~29.2% energy is saved compared with the conventional deep dehumidification process with two-stage heat pump, with the outlet humidity ratio of 2.6 g/kg.
Highlights
Regarded as an energy-efficient approach of satisfying air humidity control requirement, liquid desiccant dehumidification has been researched by massive studies [1]
The supply air humidity ratio could be reduced to 11.0~11.5 g/kg with the coefficient of performance (COP) of 6.3~7.3, when the outdoor air temperature is 28°C and humidity ratio is 20~22 g/kg
Compared with the conventional process, no extra regeneration air or corresponding air duct are needed in the proposed process, which obviously simplifies the layout of the system
Summary
Regarded as an energy-efficient approach of satisfying air humidity control requirement, liquid desiccant dehumidification has been researched by massive studies [1]. Lazzarin and Castellotti [5] have applied a single-stage module to the air handing process, and the supply air humidity ratio could be processed to 8.7~11.3 g/kg with the coefficient of performance (COP) of the processor 3.2~4.2, when the outdoor air temperature 30°C and its humidity ratio 18.7 g/kg. Under the two-stage process, the humidity ratio of 6.5~6.7 g/kg could be realized with the COP of 6.5~6.7, when the outdoor air temperature is 30.7~31.3°C and its humidity ratio is 18.4~18.7 g/kg. As for the three-stage process, the humidity ratio of 3.4~3.6 could be realized with the COP of 2.8, when the outdoor air temperature is 30.2~31.3°C. Based on the condition where the return air needs to be processed, a novel hybrid deep dehumidification process based on liquid desiccant is proposed to the configuration of the system, where the extra air duct for regeneration is discarded. The detailed form of the system and its performance will be revealed in this paper
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