SF (solar fraction) analysis of solar energy sourced absorption refrigeration systems


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Gunduz A. H., CİMŞİT C.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, vol.39, no.4, pp.2103-2112, 2024 (SCI-Expanded) identifier identifier

Abstract

Graphical/Tabular Abstract In this study, assuming that NH 3 -H 2 O and LiBr-H 2 O working fluids are used in the solar energy sourced absorption refrigeration system, when operated vacuum tube collectors have been calculated the collector areas and collector efficiencies required for the operation of the system (Figure A). The calculations have been made according to Antalya and Kocaeli, which have different solar energy potentials. In order for the examined systems to benefit from solar energy in the most economical way, solar energy utilization rates (SF) have been calculated in detail for these two different working fluids and compared with each other. Figure A. Solar energy sourced absorption refrigeration system Purpose: In this study, solar utilization rates (SF) analysis have been made in order to benefit from solar energy economically. Assuming that NH 3 -H 2 O and LiBr-H 2 O are used in the solar absorption refrigeration system for Antalya and Kocaeli, the solar utilization ratios (SF) of vacuum tube collectors have been calculated and compared. Thus, in Turkey, which has a rich solar energy potential, it is aimed to meet the energy required for refrigeration with this potential and to expand its use. Theory and Methods: It has been thought that the energy required for the absorption refrigeration system, which is an alternative to the classical cooling system, should be provided from solar energy and monthly solar radiation values have been calculated for Antalya and Kocaeli. In line with these values, collector efficiencies for vacuum tube collector areas and absorption refrigeration system have been calculated. In order for the examined systems to benefit from solar energy in the most economical way, solar utilization rates have been calculated and compared with each other. Results: In the SF analysis, it has been seen that Antalya is more advantageous than Kocaeli. As a result of the analysis, it has been determined that the required minimum collector areas are 65 and 85 m 2 in Antalya and Kocaeli in the absorption refrigeration system using LiBr-H 2 O working fluid, respectively. It has been determined that the required collector areas are the lowest in August in absorption refrigeration systems working with solar energy in two cities. Conclusion: In the SF analysis, the collector areas, which were found suitable for Antalya for LiBr-H 2 O and NH 3 -H 2 O fluid couples, with SF ratios of 78.4% and 75.2%, respectively, were calculated as 65 and 105 m 2 . For Kocaeli, the economically operating collector areas were calculated as 85 and 135 m 2 for LiBr-H 2 O and NH 3 -H 2 O couples, with SF ratios of 76.2% and 71.6%, respectively. It has been observed that the system operating with NH 3 -H 2 O fluid couple is inefficient at operating temperatures determined according to LiBrH 2 O fluid couple. It can be concluded that more efficient and economical cooling can be achieved with the effective use of solar energy technologies in absorption cooling systems.