Cycle Optimization on Reheat Adsorption Cycle Applying Fixed Chilled Water Outlet Temperature

Wirajati, I Gusti Agung Bagus and Yuki, Ueda and Takahiko, Miyazaki and Atsushi, Akisawa (2015) Cycle Optimization on Reheat Adsorption Cycle Applying Fixed Chilled Water Outlet Temperature. Heat Transfer Engineering, 37 (7). pp. 606-615. ISSN 1521-0537

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Abstract

This study investigated the cycle optimization of four-bed, silica gel–water adsorption with reheat cycle, where the desorber (upper bed) and adsorber (lower bed) always interact with the condenser and evaporator, to exploit a low heat-source temperature. In a previous study, the performance of a reheat cycle with chilled water outlet temperature fixed at 9◦C was observed without considering the cycle optimization. Maintaining a constant chilled water outlet temperature is also of equal importance to improve the conversion efficiency so that maximum cooling capacity can be derived. In this paper, a simulation model of reheat adsorption cycles is developed to analyze the optimization of the cycle time, including adsorption/desorption time, mass recovery time, and preheating/precooling time, with chilled water outlet temperature fixed. The reheat working principle is also introduced. The proposed cycle is compared with the four-bed versison without reheat cycle in terms of coefficient of performance (COP) and cooling capacity. The result shows that the performance of a reheat cycle is superior to that of four-bed version without reheat, especially for low heat-source temperature. For low heat-source temperature (55–65◦C) both COP and cooling capacity of the reheat cycle with optimization were raised significantly compared to the high heat-source temperature (70–80◦C).

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