Effect of adsorption and desorption cycle time allocation on the performance of an adsorption chiller

Lee, Woo Su; Park, Moon Yong; Lee, Seung Soo; Duong, Xuan Quang; Cao, Ngoc Vi; Kwon, Oh Kyung; Chung, Jae Dong

doi:10.1007/s12206-020-1232-y

Cited by 4 publications

(2 citation statements)

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“…In case of the three-bed chiller, the optimal total cycle time producing the highest cooling capacity is shorter than in the case of a two-bed unit [14]. Lee et al [17] observed that for a three-bed chiller (FAM-Z01/water), the adsorption to desorption ratio highly depends on the heating water temperature. For systems with heating water temperature of around 55 • C, the adsorption should be shorter than desorption, while for heating temperatures higher than 65 • C, it should be opposite-adsorption should be longer than desorption.…”

Section: Two-bed Cycle Time Allocationsmentioning

confidence: 99%

“…Many advances in the field of adsorption cooling have been achieved in the last decades. Research areas included selection of the working pair [4,5], development of efficient advanced operating cycles [6,7], enhancement of heat and mass transfer in adsorption bed [6][7][8], accurate cycle time [9][10][11][12][13][14][15][16][17], etc. As a result, adsorption chillers are now successfully commercialized and can be implemented in district heating networks [13,18].…”

Section: Introductionmentioning

confidence: 99%

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Recommendations for Running a Tandem of Adsorption Chillers Connected in Series and Powered by Low-Temperature Heat from District Heating Network

Nalepa

Halon

2021

Energies

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In this paper, we investigate implications of running a cooling system of two silicagel/water adsorption chillers powered by a district heating network. The devices are connected in series, i.e., the heating water output from the primary chiller is directed to the secondary one. In consequence, the secondary device must deal with an even lower driving temperature and with temperature fluctuations caused by the primary device. We have evaluated three factors that influence the operation of those coupled devices: synchronization of their operating cycles, selection of their cycle time allocations (CTAs), and changing the heating water mass flow rate. Numerical analyses indicate that the performance of the secondary chiller drops significantly if the coupled devices that use the same CTA run asynchronously. The decrease is largest if the shift between the operating cycles is x=0.375 and x=0.875. We found that it is possible to reduce the negative influence of the asynchronous operation by implementing different CTA in each chiller. The best performance is achieved if the primary chiller uses an adsorption time to desorption time ratio f=1.0 and the secondary chiller uses f = 0.6–0.7.

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Section: Two-bed Cycle Time Allocationsmentioning

confidence: 99%