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Effect on Air Velocity of a Structured Packed Tower in the Solar Liquid Desiccant System
Fatkhur Rokhman,Kim Jun-Ho,Agung Bakhtiar,K.H. Choi 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4
Solar liquid desiccant system is attractive because of operational flexibility and absorbtion. Through a literature review, the liquid desiccant assisted air condition can achieve up to 40% of energy savings with regard to traditional air conditioning system. This paper is about analysis of air velocity effect on a structured packed tower of liquid lithium chloride dehumidifier system. Dehumidifier is one of the essential components in the solar liquid desiccant air-conditioning system. Experimental apparatus consists of three components; a chamber, a packed tower and a chiller. Chamber's volume is 40㎥ and packed tower is also cubic with side of 0.4m occupied with packed materials. Under the controlled conditions, several factors were conducted to investigate the interactions regarding on the performance. Air inlet initial temperature and relative humidity are set with 30℃ and 52% respectively, desiccant flow rate is 0.63 ㎏/s, desiccant temperature is to-e and a desiccant concentration is 25%w.t. The results of this experiments were shown that the moisture removal rate and the heat transfer rate are influenced by the air velocity.
Fatkhur Rokhman,Agung Bakhtiar,Choi Kwang-hwan 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11
This paper investigates the performances of vaporizer or steam humidifier system with adopted packing tower material. The device used in this study is modified to maximize contact area between hot water and air. Steam humidifier is chosen for the benefit of convey mineral impurities or microorganisms from the standing water in the reservoir. Experimental apparatus consist of hot water tank, packing material in tube pipe, and air blower. Experimental held on fall condition to get respected outdoor temperature. Water used in experiment is domestic water that contain minerals. Input and output air properties are monitored real time during process using calibrated temperature and relative humidity sensors. Air inlet initial temperature and relative humidity are 9℃ and 22.5% respectively, input air velocity 4m/s on un steady flow condition, hot water flow water temperature is 45℃. The experiment result shows humidifier can maintain air properties especially for humidity ratio from 0.0071 ㎏H₂O/㎏da into stable at 0.018 ㎏H₂O/㎏da. Also raise up air temperature from 4℃ into stable in 24℃.
Fatkhur Rokhman,Agung Bakhtiar,Choi Kwang Hwan 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.4
Liquid desiccant material, such as lithium chloride (LiCl) or halide salts are usually used on air conditioning application for controlling the humidity of high Outdoor Air (OA). Solar energy is usually used to heat the liquid in regeneration process of those desiccant. The mass transfer it self is driven by the temperature different between the liquid desiccant and the input air. This experiment study is analyzing the characteristic of the aqueous LiCl-air temperature different in variance specific gravity. especially in range of temperature different using the solar energy as the heat generator. The experiment has done by variating the concentration of the LiCl with specific gravity 1.210 and 1.150. For the comparison the pure water is also used. The result show that the mass transfer rate is increased in every variation as the increases of the temperature different. and the weeker aqueous solution of the LiCl the highest mass transfer coefficient