Heat and mass transfer model of cross flow liquid desiccant air dehumidifier/regenerator

Liu, X.H.; Jiang, Yi; Qu, K. Y.

doi:10.1016/j.enconman.2006.06.002

Cited by 191 publications

(50 citation statements)

References 20 publications

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“…The heat and mass transfer processes in liquid desiccant cooling systems occurring in structured and random packed columns have been investigated by several authors (Stevens et al, 1989;Al-Farayedhi et al, 2002;Gandhidasan, 2004;Liu et al, 2007a;Liu et al, 2007b;Yin and Zhang, 2008). The mathematical model developed here is based on the analysis done by Ying and Zhang (2008) which is an extension of Stevens et al (1989) model.…”

Section: Results and Discussion Theorymentioning

confidence: 99%

A Solar Powered Liquid-Desiccant Cooling System for Greenhouses

Lychnos

Davies

2008

Acta Hortic.

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Liquid desiccant systems are of potential interest as a means of cooling greenhouses to temperatures below those achieved by conventional means. However, only very little work has been done on this technology with previous workers focussing on the cooling of human dwellings using expensive desiccants such as lithium salts. In this study we are designing a system for greenhouse cooling based on magnesium chloride desiccant which is an abundant and non-toxic substance. Magnesium chloride is found in seawater, for example, and is a by-product from solar salt works. We have carried out a detailed experimental study of the relevant properties of magnesium rich solutions. In addition we have constructed a test rig that includes the main components of the cooling system, namely a dehumidifier and solar regenerator. The dehumidifier is a cross-flow device that consists of a structured packing made of corrugated cellulose paper sheets with different flute angles and embedded cooling tubes. The regenerator is of the open type with insulated backing and fabric covering to spread the flow of desiccant solution. Alongside these experiments we are developing a mathematical model in gPROMS® that combines and simulates the heat and mass transfer processes in these components. The model can be applied to various geographical locations. Here we report predictions for Havana (Cuba) and Manila (Philippines), where we find that average wet-bulb temperatures can be lowered by 2.2 and 3°C respectively during the month of May.

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Section: Results and Discussion Theorymentioning

confidence: 99%

A Solar Powered Liquid-Desiccant Cooling System for Greenhouses

Lychnos

Davies

2008

Acta Hortic.

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“…Many researchers have performed theoretical analysis and computer simulations of the heat and mass transfer performance of the liquid desiccant dehumidifier, such as Liu et al [1], who used a theoretical model to predict the air and solution parameters inside a cross flow liquid desiccant dehumidifier/regenerator as well as the outlet parameters; the model used NTU as the input parameter. Xiao-HuaLiu et al [2] investigated an analytical solution to give air and desiccant parameters as well as enthalpy and moisture efficiency in a cross flow dehumidifier.…”

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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“…Many different technologies have been developed for these two components [8,9]. One of the two components, the regenerator in which the weak absorbent solution is concentrated need consume lots of heat.…”

Section: Introductionmentioning

confidence: 99%