Both LiCl and LiBr solutions were considered for potential use in a solar-driven Open-Cycle Absorption Refrigeration (OCAR) system. A vertical falling film absorber was proposed and built to evaluate the performance of LiCl and LiBr as an absorbent. Absorption experiments were performed and the results are reported for typical operating conditions of nonabsorbable concentrations, solution concentration, solution temperature, cooling water temperature, absorber pressure, and solution flow rate, in terms of mass transfer rate. In general, LiBr outperformed LiCl in terms of effective absorption rate. Based upon experimental results, the required absorber area was estimated for both LiCl and LiBr. The small chemical potential of LiCl relative to LiBr leads to a larger absorber area. The cost for the required solution storage for three-ton cooling capacity of the present OCAR system was found to be high for both LiCl and LiBr. The pumping cost was estimated to be less than 0.1 kW for both.

1.
Ameel
T. A.
,
Gee
K. G.
, and
Wood
B. D.
,
1995
, “
Performance predictions of alternative, low cost absorbents for open-cycle absorption solar cooling
,”
Solar Energy.
Vol.
54
, No.
2
, pp.
65
73
.
2.
Ameel
T. A.
,
Wood
B. D.
,
Seibe
D. A.
, and
Collier
R. K.
,
1994
, “
Performance Predictions of Solar Open-Cycle Absorption Air Conditioning Systems in Three Climatic Regions
,”
ASME JOURNAL OF SOLAR ENERGY ENGINEERING
, Vol.
116
, pp.
107
113
.
3.
Ameel, T. A., 1991, “Non-absorbable gas effects on heat and mass transfer in falling film absorption,” Ph.D. dissertation, Arizona State University, Tempe, AZ.
4.
Ameel, T. A., Kim, K. J., and Wood, B. D., 1997, “Non-absorbable gas effects on heat and mass transfer in wavy laminar falling film absorption,” Solar Energy, accepted for publication.
5.
Burdukov
A. P.
,
Bufetov
N. S.
,
Deriy
D. P.
,
Dorokhov
A. R.
, and
Kazakov
V. I.
,
1980
, “
Experimental study of the absorption of water vapor by thin films of aqueous lithium bromide
,”
Heat Transfer-Soviet Research
, Vol.
12
, No.
3
, pp.
118
123
.
6.
Collier
R. K.
,
1979
, “
The analysis and simulation of an open cycle absorption refrigeration system
,”
Solar Energy
, Vol.
23
, pp.
357
366
.
7.
FMC Corporation, 1996, private communication.
8.
Fujita
T.
,
1993
, “
Falling liquid films in absorption machines
,”
Int. J. Refrigeration
, Vol.
16
, pp.
282
294
.
9.
Grossman, G., 1986, “Heat and mass transfer in film absorption,” Handbook of Heat and Mass Transfer, Vol. 2, Gulf Publishing Company.
10.
Kashiwagi, T., 1988, “Basic mechanism of absorption heat and mass transfer enhancement by the Marangoni effect,” Newsletter of the lEA Heat Pump Center, Vol. 6, No. 4, pp. 2–5.
11.
Kim
K. J.
,
Berman
N. S.
, and
Wood
B. D.
,
1996
a, “
Effect of 2-ethyl-1-hexanol on the absorption of water vapor into lithium bromide solution
,”
AICHE J.
, Vol.
42
, No.
3
, pp.
884
888
.
12.
Kim
K. J.
,
Berman
N. S.
, and
Wood
B. D.
,
1996
b, “
The interfacial turbulence in falling film absorption: Effect of additives
,”
Int. J. Refrigeration
, Vol.
19
, No.
5
, pp.
322
330
.
13.
Kim, K. J., Kulankara, S., Herold, K. E., and Miller, C. 1996c, “Heat transfer additives for use in high temperature applications”. The Proceeding of the International Absorption Heat Pump Conference ’96, Montreal, Canada, pp. 89–97.
14.
Kim
K. J.
,
Berman
N. S.
,
Chau
D. S. C.
, and
Wood
B. D.
,
1995
a, “
Absorption of water vapor into falling films of aqueous lithium bromide
,”
Int. J. Refrigeration
, Vol.
18
, No.
7
, pp.
486
494
.
15.
Kim, K. J., Kulankara, S., and Herold, K. E., 1995b, “Experimental evaluation of enhancement additives for the absorption of water vapor into aqueous LiBr,” Proceedings of the ASME Winter Annual Meeting, San Francisco, CA, AES-Vol. 34, pp. 183–192.
16.
Kim, K. J., Berman, N. S., and Wood, B. D., 1994, “Experimental investigation of enhanced heat and mass transfer mechanisms using additives for vertical falling film absorber,” Proceedings of the International Absorption Heal Pump Conf ’94, Vol. AES-Vol. 31, pp. 41–47.
17.
Kim, K. J., 1992, “Heat and mass transfer enhancement in absorption cooling,” Ph.D. dissertation, Arizona State University, Tempe, AZ.
18.
Nakoryakov
V. E.
,
Bufetov
N. S.
, and
Grigor’eva
N. I.
,
1982
, “
Heat and mass transfer in film absorption
,”
Fluid Mechanics-Soviet Research
, Vol.
11
, No.
3
, pp.
92
96
.
19.
Perez-Bianco
H.
, and
Sheehan
D. S.
,
1995
, “
Effect of additive concentration on falling film absorption
,”
HVAC&R Research
, Vol.
1
, No.
4
, pp.
273
281
.
20.
Siebe, D. A., 1986, “Evaluation of air-conditioning systems utilizing liquid absorbents regenerated by solar energy,” Ph.D. dissertation, Arizona State University, Tempe, AZ.
21.
Sherwood, T. K., and Pigford, R. L., 1952, Absorption and Extraction, McGraw-Hill, New York.
22.
Wardona, B., and Nelson, R. M., 1996, “Simulation of a solar-assisted LiBr/H2O absorption cooling system,” Winter ASHRAE Absorption Symposium Paper #3943, Feb., Atlanta, GA.
23.
Wood, B. D., Seibe, D. A., and Collier, R. K., 1984, “Design analysis of a residential solar open-cycle absorption cooling system,” Report for Arizona Solar Energy Commission, Arizona State University, Tempe, AZ.
24.
Yang, R., 1987, “Heat and mass transfer in laminar wavy film absorption with the presence of non-absorbable gases,” Ph.D. dissertation, Arizona State University, Tempe, AZ.
25.
Yong
D.
,
Lorenz
J. J.
, and
Ganic
E.
,
1980
, “
Vapor/liquid interaction and entrainment in falling film evaporators
,”
ASME Journal of Heat Transfer
, Vol.
102
, pp.
20
25
.
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