Cycle Optimization on Reheat Adsorption Cycle Applying Fixed Chilled Water Outlet Temperature. Issue 7 (23rd May 2016)

• Record Type: Journal Article
• Authors: Bagus Wirajati, I Gusti Agung; Ueda, Yuki; Akisawa, Atsushi; Miyazaki, Takahiko
• Is Part Of: Heat transfer engineering. Volume 37:Issue 7/8(2016)
• Page Start: 606
• Page End: 615
• Publication Date: 2016-05-23
• Subjects: Heat -- Transmission -- Periodicals; 621.4022
• DOI: 10.1080/01457632.2015.1066650
• Languages: English
• ISSNs: 0145-7632

Abstract

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).