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Experimental investigation of an internally-cooled open sorption system for air dehumidification using ionic liquids.

Number: pap. TP-0036

Author(s) : RICART C., MEYER T., NIEMANN K., et al.

Summary

Open sorption systems are typically operated with aqueous inorganic solutions such as lithium chloride (LiCl). These absorbents, however, are limited in their dehumidification capacity by their crystallization limit and usually exhibit disadvantageous corrosion properties. In contrast, some aqueous solutions of so-called ionic liquids (IL) show low water vapor pressures and usually do not corrode stainless steel. An internally-cooled open absorption system for air dehumidification using the ionic liquid IL4 has been experimentally investigated. The influence of the regeneration temperature, the heat rejection temperature and the ambient humidity on the dehumidification and the thermal efficiency of the system has been analyzed. In the experiments it is investigated whether the targeted dew point temperature of -20°C is achieved independently of the ambient moisture. In a first set of experiments, the cooling temperature was set constant to 30°C and the driving temperature was set to 85°C and 105°C while the ambient humidity was varied. In a second set of experiments, the driving temperature was set constant to 85°C and the cooling temperature was set to 21°C, 25°C, 30°C and 35°C. In both experiments, the volumetric air flow rate in the absorber and in the desorber was approximately 630m3/h and the ambient air temperature was 28°C. The transfer area of the absober was 12 m2 and of the desorber 6 m2. In comparison to the experiments with LiCl reported in literature at comparable conditions, the system using IL4 exhibited lower absolute humidities at the absorber outlet air (larger dehumidification). The target humidity of 0.7gv/kga was reached at ambient humidites below 8gv/kga. High regeneration temperatures and low cooling temperatures led to larger dehumidification for a given ambient humidity due to largerdriving partial pressure differences. However, the thermal efficiency deteriorates with increasing regeneration temperature due to larger thermal losses.

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Details

  • Original title: Experimental investigation of an internally-cooled open sorption system for air dehumidification using ionic liquids.
  • Record ID : 30021536
  • Languages: English
  • Source: 5th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants.
  • Publication date: 2017/04/23
  • DOI: http://dx.doi.org/10.18462/iir.tptpr.2017.0036

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