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.

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.

scholarly journals Performance investigation of a novel hybrid deep-dehumidification process using liquid desiccant

2019 ◽  
Vol 111 ◽  
pp. 01047
Author(s):  
Bowen Guan ◽  
Jun Liu ◽  
Xiaohua Liu ◽  
Tao Zhang ◽  
Liangliang Chen ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Heat Pump ◽  
System Performance ◽  
Air Conditioning ◽  
Cooling Capacity ◽  
Liquid Desiccant ◽  
Humidity Ratio ◽  
Air Conditioning System ◽  
Heating Capacity ◽  
Flow Through

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.

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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