Heat and mass transfer in liquid desiccant air-conditioning process at low flow conditions

Peng, S. W.; Pan, Zhan-cheng

doi:10.1016/j.cnsns.2009.01.009

Cited by 21 publications

(7 citation statements)

References 11 publications

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“…To realize the effective and stable operation of system, it requires reliable control of the dehumidifier [1], which relies greatly on accurate prediction of their transient response. However, the previous studies mainly focused on the steady-state heat and mass transfer processes, and research in the aspect of transient performance was still very limited for the dehumidifier [2][3][4]. Therefore, in the present paper, a dynamic model was developed to render the predication of the transient response performance of the dehumidifier.…”

Section: Introductionmentioning

confidence: 99%

Study on the Transient Performance of a Liquid Desiccant Dehumidifier under Changing Boundary Conditions

Zhong¹,

Chen²,

Luo³

2018

The Economy, Sustainable Development, and Energy International Conference

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It was found that there were still very limited studies for the dynamic operation and transient performance of the dehumidifier. Besides, the coupling study of heat, mass and flow was not comprehensive and lots of assumption was made to start the simulation. Lack of accurate prediction, the guidelines of control system design and operation cannot be put forward appropriately. Therefore, the paper established a reliable dynamic model for the dehumidifier. With the model, it obtained the transient response performance of the dehumidifier under changing boundary conditions, such as response time and response curves of outlet parameters. The magnitudes of the influences of various inlet parameters was analyzed, providing reliable and effective predication of the transient response performance of the dehumidifier.

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Section: Introductionmentioning

confidence: 99%

Study on the Transient Performance of a Liquid Desiccant Dehumidifier under Changing Boundary Conditions

Zhong¹,

Chen²,

Luo³

2018

The Economy, Sustainable Development, and Energy International Conference

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“…The results show that 6-3-3-1 ANN structure was the best model for predicting the watercondensation rate, where as the 6-6-6-1 was the best model for predicting the dehumidifier effectiveness. Local volumetric average approach wasusedbyPengandPan [7] to investigate the transient heat and mass transfer in liquid desiccant air-conditioning process at low flow conditions.…”

Section: Introductionmentioning

confidence: 99%

Computer Simulation of Heat and Mass Transfer in a Cross Flow Parallel-Plate Liquid Desiccant-Air Dehumidifier

Mohammad

Mat²,

Sulaiman³

et al. 2014

Progress in Sustainable Energy Technologies Vol II

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A MATLAB program using finite difference technique is investigated to predict the distribution of air stream parameters as well as desiccantsolution parameters inside the parallel plate absorber. The present absorber consists of 14 parallel plates with a surface area per unit volume ratio of 80 m 2 /m 3 . Calcium chloride as a liquid desiccant flows through the top of the plates to the bottom while the air flows through the gap between the plates making it a cross flow configuration. The model results show the effect of desiccant mass flow rate on the performance of the dehumidifier (moisture removal rateand the effectiveness). The results show that the maximum temperature and humidity ratio differences of the air are 2.56 C and 11 g/Kg with a maximum solution mass flow rate of 160 g/s. The maximum temperature and minimum concentration differences of solution in the direction flow of solution are 3.185 C and 0.34 % with a maximum solution mass flow rate of 160 g/s. The moisture removal rate increases rapidly with solution flow rate from 1.41 to 2.196 g s À1 , but the moisture removal stagnates at high desiccant solution mass flow rates. The effectiveness achieves an increase of 0.39-0.66 when the solution mass flow rate increases from 30 to 160 g s À1 .

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“…Gandhidasan et al [17] investigated the transient behavior of a gauze-type structured packing liquid desiccant dehumidifier. More recently, Peng and Pan [18] used a local volumetric average approach to develop a transient one-dimensional model of a liquid desiccant process at low flow conditions. The results were compared with the measurements at a experimental test stand filled with plastic pall ring packing material.…”

Section: List Of Symbolsmentioning

confidence: 99%

Numerical investigation of transient heat and mass transfer in a parallel-flow liquid-desiccant absorber

Dı́az

2010

Heat Mass Transfer

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Liquid desiccant systems have received significant attention as a way to reduce latent loads. Tests of liquid desiccant systems in humid climates have shown significant reductions in energy consumption. As moisture in the air is absorbed at the dehumidifier, the temperature of the liquid desiccant increases due to the addition of heat from the enthalpy of condensation of the water vapor. Thus, the coupled effects of heat and mass transfer are relevant for these applications. A two-dimensional mathematical model of the transient heat and mass transfer for an absorber where a thin film of liquid desiccant flows down its walls and dehumidifies the air in parallel-flow configuration is developed and the dynamics of the modeled system are analyzed. List of symbols

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Heat and mass transfer in liquid desiccant air-conditioning process at low flow conditions

Cited by 21 publications

References 11 publications

Study on the Transient Performance of a Liquid Desiccant Dehumidifier under Changing Boundary Conditions

Study on the Transient Performance of a Liquid Desiccant Dehumidifier under Changing Boundary Conditions

Computer Simulation of Heat and Mass Transfer in a Cross Flow Parallel-Plate Liquid Desiccant-Air Dehumidifier

Numerical investigation of transient heat and mass transfer in a parallel-flow liquid-desiccant absorber

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