Performance Analysis of Dehumidification using Calcium Chloride in Make-up Air System
Date Issued
2011
Date
2011
Author(s)
Lin, Kuan-Ting
Abstract
Traditional air conditioning systems use chillers for dehumidification. In this study, liquid-desiccant dehumidification is an effective method for extracting moisture from the air with relatively low energy consumption. In practice, the system requires power only for water pumps and solution pumps. In a liquid desiccant air conditioning system, humidity can be controlled individually, which has great advantages comparing to the traditional air-conditioning system.
This study proposes a new type of make-up air system. The features are: (1) system coupling with geothermal energy, (2) liquid desiccant dehumidification, (3) super saturation spray cooling and cold energy recycling. Calcium Chloride aqueous solution was used as the liquid desiccant in this system. Dehumidification performance is studied with experimental and numerical method.
Condition of the system is 17.7 g / kg humidity ratio for the inlet air, air flow rate is 0.25 kg/s, which can reduce 5 g/kg of the humidity ratio, and the indoor environment humidity ratio could achieve by 12.8 g/kg dehumidification efficiency can reach 70%. It was found that when increasing air and desiccant inlet flow rate, air inlet absolute humidity and desiccant inlet concentration, the moisture removal rate will be higher. When decreasing air inlet flow rate and increasing desiccant inlet flow rate, the dehumidifier effectiveness will be higher.
Subjects
make-up air system
liquid desiccant dehumidification
desiccant
Calcium chloride
SDGs
Type
thesis
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