Optimization of a lithium bromide–water solar absorption cooling system with evacuated tube collectors using the genetic algorithm

In this work, the performance of a single effect absorption cooling system fed by solar thermal energy is evaluated. The absorption chiller includes a membrane-based microchannel desorber using three types of nanoparticles: Al2O3, CuO, or carbon nanotubes (CNT). Correlations available in the open literature to calculate the thermal conductivity of nanofluids are reviewed. Using experimental data for the water-lithium bromide solution (H2O-LiBr) with Al2O3 and CNT nanoparticles, the most appropriate correlation for thermal conductivity is selected. Nanofluid properties are evaluated using a concentration of nanoparticles of up to 5% in volume. The largest increase in the desorption rate (7.9%), with respect to using pure H2O-LiBr solution, is obtained using CNT nanoparticles and the maximum concentration of nanoparticles simulated. The performance of the chiller is evaluated and the daily solar coefficient of performance (SCOP) for the solar cooling facility is obtained. The best improvement with respect to the conventional system (without nanoparticles) represents an increase in the cooling effect of up to 6%. The maximum number of desorber modules recommended, always lower than 50, has been identified.

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Design and Development of Utilization Factor for Solar Absorption Cooling System

Energy & Environment ◽

10.1260/095830507782088604 ◽

2007 ◽

Vol 18 (6) ◽

pp. 761-782 ◽

Cited By ~ 1

Author(s):

V. Mittal ◽

N.S. Thakur

Keyword(s):

Cooling System ◽

Design And Development ◽

Solar Absorption ◽

Utilization Factor ◽

Absorption Cooling ◽

Solar Absorption Cooling ◽

Absorption Cooling System

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Modelling and simulation of a solar absorption cooling system for India

Journal of Energy in Southern Africa ◽

10.17159/2413-3051/2006/v17i3a3290 ◽

2006 ◽

Vol 17 (3) ◽

pp. 65-70 ◽

Cited By ~ 4

Author(s):

V Mittal ◽

K S Kasana ◽

N S Thakur

Keyword(s):

Surface Area ◽

Cooling System ◽

Hot Water ◽

Coefficient Of Performance ◽

Reference Temperature ◽

Inlet Temperature ◽

Solar Absorption ◽

Absorption Cooling ◽

Solar Absorption Cooling ◽

Absorption Cooling System

This paper presents modelling and simulation of a solar absorption cooling system. In this paper, the modelling of a solar-powered, single stage, absorption cooling system, using a flat plate collector and water–lithium bromide solution, is done. A computer program has been developed for the absorption system to simulate various cycle configurations with the help of various weather data for the village Bahal, District Bhiwani, Haryana, India. The effects of hot water inlet temperatures on the coefficient of performance (COP) and the surface area of the absorption cooling component are studied. The hot water inlet temperature is found to affect the surface area of some of the system components. Moreover the effect of the reference temperature which is the minimum allowable hot water inlet temperature on the fraction of total load met by non-purchased energy (FNP) and coefficient of performance (COP) is studied and it is found that high reference temperature increases the system COP and decreases the surface area of system components but lower reference temperature gives better results for FNP than high reference temperatures.

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