Desiccant evaporation cooling technology is compatible with the environment and can be used as an air conditioner in the indoor environment of the buildings. The characteristics of dehumidification column of the liquid desiccant evaporation cooling air conditioning system (LDCS) are introduced in this paper. This system was designed and manufactured for this purpose. Lithium chloride (LiCl), as liquid desiccant, and a packed bed column were used for the dehumidification. The described system includes a part for processed air simulation in various temperatures, humidities, and flow rates. The effectiveness model, based on heat and mass transfer equations, is considered for predicting performance of the lithium chloride dehumidification system. For validation purpose, a comparison was performed between experimental outlet data of the system and the corresponding results of the experimental model that showed a satisfactory correlation i.e., increase in the mass transfer unit number (NTU) leads to a better performance of the dehumidification system. In addition, factors leading to increase in NTUs are also investigated.

References

References
1.
Daou
,
K.
,
Wang
,
R. Z.
, and
Xia
,
Z. Z.
, 2006, “
Desiccant Cooling Air Conditioning: A Review
,”
Renewable Sustainable Energy Rev.
,
10
, pp.
55
77
.
2.
Kinsara
,
A. A.
,
Elsayed
,
M.
, and
Al-Rabghi
,
O. M.
, 1996, “
Proposed Energy Efficient System Using Liquid Desiccant
,”
Appl. Therm. Eng.
,
16
, pp.
791
896
.
3.
Jain
,
S.
,
Dhar
,
P. L.
, and
Kaushik
,
S. C.
, 2000, “
Experimental Studies on the Dehumidifier and Regenerator of a Liquid Desiccant Cooling System
,”
Appl. Therm. Eng.
,
20
, pp.
253
267
.
4.
Mandegari
,
M. A.
, and
Pahlavanzadeh
,
H.
, 2010, “
Performance Assessment of Hybrid Desiccant Cooling System at Various Climates
,”
Energy Efficiency
,
3
, pp.
177
187
.
5.
Mandegari
,
M. A.
, and
Pahlavanzadeh
,
H.
, 2009, “
Introduction of a New Definition for Effectiveness of Desiccant Wheels
,”
Energy
,
34
, pp.
797
803
.
6.
Ren
,
C. Q.
, 2008, “
Effectiveness–NTU Relation for Packed Bed Liquid Desiccant–Air Contact Systems With a Double Film Model for Heat and Mass Transfer
,”
Int. J. Heat Mass Transfer
,
51
, pp.
1793
1803
.
7.
Ren
,
C. Q.
, 2008, “
Corrections to the Simple Effectiveness-NTU Method for Counterflow Cooling Towers and Packed Bed Liquid Desiccant–Air Contact Systems
,”
Int. J. Heat Mass Transfer
,
51
, pp.
237
245
.
8.
Ren
,
C. Q.
,
Tu
,
M.
, and
Wang
,
H. H.
, 2007, “
An Analytical Model for Heat and Mass Transfer Processes in Internally Cooled or Heated Liquid Desiccant–Air Contact Units
,”
Int. J. Heat Mass Transfer
,
50
, pp.
3545
3555
.
9.
Ren
,
C. Q.
,
Yi
,
J.
, and
Yianpin
,
Z.
, 2006, “
Simplified Analysis of Coupled Heat and Mass Transfer Processes in Packed Bed Liquid Desiccant-Air Contact System
,”
Sol. Energy
,
80
, pp.
121
131
.
10.
Shaji Mohan
,
B.
,
Prakash Maiya
,
M.
, and
Tiwari
,
S.
, 2008, “
Performance Characterization of Liquid Desiccant Columns for a Hybrid Air-Conditioner
,”
Appl. Therm. Eng.
,
28
, pp.
1342
1355
.
11.
Gandhidasan
,
P.
, 2002, “
Prediction of Pressure Drop in a Packed Bed Dehumidifier Operating With Liquid Desiccant
,”
Appl. Therm. Eng.
,
22
, pp.
1117
1127
.
12.
Oliveira
,
A. C.
,
Afonso
,
C. F.
,
Riffat
,
S. B.
,
Prince
,
S.
, and
Doherty
,
P. S.
, 2000, “
Thermal Performance of a Novel Air Conditioning System Using a Liquid Desiccant
,”
Appl. Therm. Eng.
,
20
, pp.
1213
1223
.
13.
Chen
,
X. Y.
,
Li
,
Z.
,
Jiang
,
Y.
, and
Qu
,
K. Y.
, 2006, “
Analytical Solution of Adiabatic Heat and Mass Transfer Process in Packed-Type Liquid Desiccant Equipment and Its Application
,”
Sol. Energy
,
80
(
11
), pp.
1509
1516
.
14.
Braun
,
J. E.
, 1988, “Methodologies for the Design and Control of Chilling Water System,” Ph.D. thesis in Mechanical Engineering, University of Wisconsin, Madison.
15.
Yin
,
Y.
, and
Zhang
,
X.
, 2008, “
A New Method for Determining Coupled Heat and Mass Transfer Coefficients Between Air and Liquid Desiccant
,”
Int. J. Heat Mass Transfer
,
51
, pp.
3287
3297
.
16.
Stevens
,
D. I.
, 1988, “Analysis of Liquid-Desiccant Systems and Component Modeling,” Master of Science thesis in Mechanical Engineering, University of Wisconsin, Madison.
17.
Stevens
,
D. I.
,
Braun
,
J. E.
, and
Klein
,
S. A.
, 1989, “
An Effectiveness Model of Liquid Desiccant System Heat/Mass Exchangers
,”
Sol. Energy
,
42
(
6
), pp.
449
455
.
You do not currently have access to this content.