Effects of the Boundary Condition on the Performance of a Falling Film Dehumidifier of Solar Liquid Desiccants Air Conditioning System

2013 ◽  
Vol 291-294 ◽  
pp. 172-175
Author(s):  
Sun Jian
Keyword(s):  
Air Conditioning ◽  
Falling Film ◽  
Absorption Process ◽  
Liquid Desiccant ◽  
Governing Equations ◽  
Counter Flow ◽  
Air Conditioning System ◽  
Interfacial Conditions ◽  
Vapor Absorption ◽  
Simultaneous Heat

In this paper, a two-dimensional mathematical model of simultaneous heat and mass transfer of vapor absorption process in a counter-flow dehumidifier is conducted. The governing equations with different boundary and interfacial conditions describing the dehumidifying process are established. The calcium chloride solution is applied as the desiccant. The dehumidifying process between falling liquid desiccant film and process air with first, second and third boundary conditions is analyzed and calculated, respectively. Temperature distribution of the process air and desiccant solution is presented. Outlet parameters of the dehumidifier for both the process air and the desiccant solution are obtained.

Mathematical Modeling for the Regenerator of Liquid Desiccant Air-Conditioning System

2013 ◽  
Vol 465-466 ◽  
pp. 226-231
Author(s):  
Majid Ali Wassan ◽  
Khairul Habib ◽  
Suhaimi B. Hassan
Keyword(s):  
Mathematical Model ◽  
Air Conditioning ◽  
Flow Direction ◽  
Model Performance ◽  
Dilute Solution ◽  
Liquid Desiccant ◽  
Humidity Ratio ◽  
Counter Flow ◽  
Air Conditioning System ◽  
Flow Configuration

T his paper presents mathematical model for regenerator of liquid desiccant air conditioning system. Regression analysis was used to get the relation between enthalpy and humidity ratio. Performance of regenerator is highly affected by varying the flow direction between air & desiccant thus to get proper regeneration results counter-flow configuration is considered. Previous studies show better regeneration results for counter-flow direction of air to desiccant. Validation is done by comparing results of present study the experimental results of previous studies and comparison was found to be quite satisfactory. Based on above mathematical model performance of regenerator was analyzed. The purpose of this research was regeneration of liquid desiccant from its dilute-solution form to strong-solution.

scholarly journals Fabrication of Falling Film Liquid Desiccant Air-Conditioning System

2016 ◽  
Vol 03 (01) ◽  
Author(s):  
Sasapu Venkatesh ◽  
Rohit Babu V ◽  
Bhargav N ◽  
Rajesh A ◽  
Rambabu M ◽  
...  
Keyword(s):  
Air Conditioning ◽  
Falling Film ◽  
Liquid Desiccant ◽  
Air Conditioning System

scholarly journals Performance analysis of a novel liquid desiccant-vapor compression hybrid air-conditioning system

Energy ◽  
2016 ◽  
Vol 109 ◽  
pp. 180-189 ◽  
Author(s):  
Li Yinglin ◽  
Zhang Xiaosong ◽  
Tan Laizai ◽  
Zhang Zhongbin ◽  
Wu Wei ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Air Conditioning ◽  
Vapor Compression ◽  
Liquid Desiccant ◽  
Air Conditioning System

scholarly journals Performance optimization of polymeric porous membrane-based liquid desiccant air dehumidifier used in air conditioning system

2019 ◽  
Vol 11 (1) ◽  
pp. 55-71
Author(s):  
Ali Mohammad Jafarpour ◽  
Farivar Fazelpour ◽  
Seyyed Abbas Mousavi
Keyword(s):  
Performance Optimization ◽  
Air Conditioning ◽  
Weather Conditions ◽  
Porous Membrane ◽  
Operating Conditions ◽  
Regeneration System ◽  
Liquid Desiccant ◽  
Air Conditioning System ◽  
Air Stream ◽  
Improved Performance

AbstractIn this study an experimental design was developed to optimize the performance and structure of a membrane-based parallel-plate liquid desiccant dehumidifier used in air conditioning regeneration system which operates under high humidity weather conditions. We conducted a series of polymeric porous membranes with different compositions fabricated that were prepared with various weight percentages of polysulfone (PSU), mixed with N-methyl-2-pyrrolidone (NMP) and dimethyl form amide (DMF) solvents. Furthermore, the designed experiments were performed under various operating conditions, indicating that the dehumidification efficiency declines with increasing flow rate, temperature, and humidity. Consequently, a membrane with optimized porosity and moisture permeability was selected which resulted in eliminating the carryover of solution droplets in the air, largely due to separating the flow condition of liquid desiccant (Li Cl) and air. This specific design is also greatly benefited by removing the water vapor from the air stream. The results of mathematical model simulations indicate that the DMF solvent had higher dehumidification capability compared with that of NMP under the optimized operating conditions. Additionally, it can clarify the porosity of the membrane which plays a significant role in the overall performance. Therefore, the fabricated membrane produces fresh cool air, and it can be applied as a guiding sample for designing the membrane-based dehumidifier with improved performance.

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