TED-AJ03-276 STUDY OF ABSORPTION REGENERATOR WITH OPTICAL FIBER CONDUCTING SOLAR ENERGY

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The study presents a theoretical model of absorbent generator with optical fiber conducting solar energy to improve the absorption refrigerating system performances, and aims at clarifying the best heating method for the desorber, that is the condition of providing the most amount of generated refrigerant vapor. In heat driven refrigeration and air conditioning systems, absorption refrigerator driven by renewable energy such as solar energy is one of the effective cooling technologies from the standpoint of rational energy utilization, energy saving and global environmental issue. In the conventional system, the generator is heated with hot water converted thermal energy at solar collector. This heat exchanging process, however, has large heat loss. It is seemed that solution temperature in the conventional generator does not increase enough to generate the refrigerant. Therefore, it is important to develop a heating method of the generator, and to evaluate the performance. In the paper, the generator with optical fiber conducting solar energy is proposed. Theoretical model of the performance is presented, and the performance is evaluated. The best heating point and heating pattern in the generator is also examined and discussed. And an experiment on the pool heating of LiBr solution using optical fiber is performed. It is confirmed that (1) the solar energy transfer rate of the optical fiber is evaluated as 0.6. In the numerical analysis, it is examined that (2) mass of the generated vapor in the case of which input heat flux is twice becomes about twice, and (3) LiBr concentration reaches more than 63% which is the same as concentration of the conventional gas fired absorption chiller. It is clarified that (4) the mass of generated vapor in the case of partial heating becomes larger than that of uniform heating, and (5) the mass doesn't effectively depend on the number of heating parts, and the mass doesn's effectively depend on the heat flux concentration. It suggests that it is important to consider the heating pattern that the generation rate doesn't become minus, particularly heat input should concentrate around the inlet, and that the rate reaches zero at the outlet of generator.[figure]
一般社団法人日本機械学会の論文

TED-AJ03-276 STUDY OF ABSORPTION REGENERATOR WITH OPTICAL FIBER CONDUCTING SOLAR ENERGY

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