2011 International Conference on Alternative Energy in Developing Countries and Emerging Economies
- 224 -
and Goswami’ [18] which shows only a
small effect to
evaporation rate.
The effect of air flow rate in Katejanekarn and Kumar’
[19] and in the present study are similar, i.e. insignificant.
However, Fumo and Goswami’s [18] study shows the
opposite, i.e. increasing air flow rate increases the
evaporation rate.
The different findings of these three studies on the
effect of various parameters in the evaporation rate are
hardly surprising. They studied different types of
regenerators with difference experimental conditions and
set up.
V. C
ONCLUSIONS
From the investigation results reported in this paper,
the following conclusions can be drawn:
The hot water flow rate has a significant effect on the
concentration change. The higher the flow rate the higher
the concentration change as a result of increased rate of
the heat transfer from water to the solution. Increase in
desiccant flow rate decreases the concentration change
due to the limited time for the desiccant solution. Increase
in water temperature increase the concentration change.
Air flow rate has insignificant effect on the concentration
change because the two dominants, wet and dry bulb
temperature, play their relative humidity roles.
According to the influence of parameters on
evaporation rate of the regenerator, almost all of the
results are in the similar direction with the concentration
changes. Increasing in desiccant flow rate increases the
evaporation rate while decreases the concentration
change.
R
EFERENCES
[1] Alizadeh, S. and Saman, W. Y.,
Modeling and
performance of a forced flow solar collector/regenerator
using liquid desiccant
, Solar Energy, vol.72, 2002, pp.
143-154.
[2] Yutong, L. and Hongxing, Y.,
Investigation on solar
desiccant dehumidification process for energy
conservation of central air-conditioning systems
, Applied
Thermal Engineering, vol.28, 2008, pp. 1118-1126.
[3] Peng, D. and Zhang, X.,
Modeling and performance
analysis of solar air pretreatment collector/regenerator
using liquid desiccant
, Renewable Energy, vol.34, 2009,
pp. 699-705.
[4] Saman, W. Y. and Alizadeh, S.,
An experimental study of
a cross-flow type plate heat exchanger for
dehumidification/cooling
, Solar Energy, vol.73, 2002, pp.
59-71.
[5] Mesquita, L. C. S., Harrison, S. J. and Thomey, D.,
Modeling of heat and mass transfer in parallel plate
liquid-desiccant dehumidifiers
, Solar Energy, vol.80,
2006, pp. 1475-1482.
[6] Krause, M., Saman, W., Halawa, E., Heinzen, R., Jordan,
U. and Vajen, K., Absorber and regenerator models for
liquid desiccant air conditioning systems: validation and
comparison using experimental data, Proceedings of ISES
World Solar Congress 2007:Solar Energy and Human
Settlement, Tsinghua University Press, Beijing and
Springer-Verlag GmbH Berlin Heidelberg., Beijing, 2007,
pp. 770-774.
[7] Gandhidasan, P.,
Quick performance prediction of liquid
desiccant regeneration in a packed bed
, Solar Energy,
vol.79, 2005, pp. 47-55.
[8] Yin, Y., Zhang, X. and Chen, Z.,
Experimental study on
dehumidifier and regenerator of liquid desiccant cooling
air conditioning system
, Building and Environment,
vol.42, 2007, pp. 2505-2511.
[9] Liu, X.-H., Jiang, Y. and Qu, K.-Y.,
Analytical solution of
combined heat and mass transfer performance in a cross-
flow packed bed liquid desiccant air dehumidifier
,
International Journal of Heat and Mass Transfer, vol.51,
2008, pp. 4563-4572.
[10] Liu, X. H., Jiang, Y. and Yi, X. Q.,
Effect of regeneration
mode on the performance of liquid desiccant packed bed
regenerator
, Renewable Energy, vol.34, 2009, pp. 209-
216.
[11] Saman, W., Halawa, E. and Chanprasopchai, T.,
Experimental study of the regenerator in a liquid
desiccant cooling system,
World Renewable Energy
Congress 2009 - Asia, Bangkok, Thailand, 2009, pp. 621-
626.
[12] Ren, C. Q., Tu, M. and Wang, H. H.,
An analytical model
for heat and mass transfer processes in internally cooled
or heated liquid desiccant-air contact units
, International
Journal of Heat and Mass Transfer, vol.50, 2007, pp.
3545-3555.
[13] Yin, Y., Zhang, X., Peng, D. and Li, X.,
Model validation
and case study on internally cooled/heated
dehumidifier/regenerator of liquid desiccant systems
,
International Journal of Thermal Sciences, vol.48, 2009,
pp. 1664-1671.
[14] Lowenstein, A., Slayzak, S., Ryan, J. and Pesaran, A.,
Advanced Commercial Liquid-Desiccant Technology
Development Study
, National Renewable Energy
Laboratory and A national laboratory of the U.S.
Department of Energy, 1998.
[15] AIRAH,
AIRAH Technical handbook
, 4
th
ed., Australian
Institute of Refrigeration Air Conditioning and Heating
(Inc.), Melbourne, Victoria, 2007.
[16] Yin, Y., Zhang, X., Wang, G. and Luo, L.,
Experimental
study
on
a
new
internally
cooled/heated
dehumidifier/regenerator of liquid desiccant systems
,
International Journal of Refrigeration, vol.31, 2008, pp.
857-866.
[17] Alizadeh, S. and Saman, W. Y.,
An experimental study of
a forced flow solar collector/regenerator using liquid
desiccant
, Solar Energy, vol.73, 2002, pp. 345-362.
[18] Fumo, N. and Goswami, D. Y.,
Study of an aqueous
lithium chloride desiccant system: air dehumidification
and desiccant regeneration
, Solar Energy, vol.72, 2002,
pp. 351-361.
[19] Katejanekarn, T. and Kumar, S.,
Performance of a solar-
regenerated liquid desiccant ventilation pre-conditioning
system
, Energy and Buildings, vol.40, 2008, pp. 1252-
1267
